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1436 lines
41 KiB
1436 lines
41 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ |
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#define _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ |
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|
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#include <asm-generic/pgtable-nop4d.h> |
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|
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#ifndef __ASSEMBLY__ |
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#include <linux/mmdebug.h> |
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#include <linux/bug.h> |
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#include <linux/sizes.h> |
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#endif |
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|
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/* |
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* Common bits between hash and Radix page table |
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*/ |
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#define _PAGE_BIT_SWAP_TYPE 0 |
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|
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#define _PAGE_EXEC 0x00001 /* execute permission */ |
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#define _PAGE_WRITE 0x00002 /* write access allowed */ |
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#define _PAGE_READ 0x00004 /* read access allowed */ |
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#define _PAGE_RW (_PAGE_READ | _PAGE_WRITE) |
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#define _PAGE_RWX (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC) |
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#define _PAGE_PRIVILEGED 0x00008 /* kernel access only */ |
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#define _PAGE_SAO 0x00010 /* Strong access order */ |
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#define _PAGE_NON_IDEMPOTENT 0x00020 /* non idempotent memory */ |
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#define _PAGE_TOLERANT 0x00030 /* tolerant memory, cache inhibited */ |
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#define _PAGE_DIRTY 0x00080 /* C: page changed */ |
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#define _PAGE_ACCESSED 0x00100 /* R: page referenced */ |
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/* |
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* Software bits |
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*/ |
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#define _RPAGE_SW0 0x2000000000000000UL |
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#define _RPAGE_SW1 0x00800 |
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#define _RPAGE_SW2 0x00400 |
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#define _RPAGE_SW3 0x00200 |
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#define _RPAGE_RSV1 0x00040UL |
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|
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#define _RPAGE_PKEY_BIT4 0x1000000000000000UL |
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#define _RPAGE_PKEY_BIT3 0x0800000000000000UL |
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#define _RPAGE_PKEY_BIT2 0x0400000000000000UL |
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#define _RPAGE_PKEY_BIT1 0x0200000000000000UL |
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#define _RPAGE_PKEY_BIT0 0x0100000000000000UL |
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|
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#define _PAGE_PTE 0x4000000000000000UL /* distinguishes PTEs from pointers */ |
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#define _PAGE_PRESENT 0x8000000000000000UL /* pte contains a translation */ |
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/* |
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* We need to mark a pmd pte invalid while splitting. We can do that by clearing |
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* the _PAGE_PRESENT bit. But then that will be taken as a swap pte. In order to |
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* differentiate between two use a SW field when invalidating. |
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* |
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* We do that temporary invalidate for regular pte entry in ptep_set_access_flags |
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* |
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* This is used only when _PAGE_PRESENT is cleared. |
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*/ |
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#define _PAGE_INVALID _RPAGE_SW0 |
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|
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/* |
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* Top and bottom bits of RPN which can be used by hash |
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* translation mode, because we expect them to be zero |
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* otherwise. |
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*/ |
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#define _RPAGE_RPN0 0x01000 |
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#define _RPAGE_RPN1 0x02000 |
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#define _RPAGE_RPN43 0x0080000000000000UL |
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#define _RPAGE_RPN42 0x0040000000000000UL |
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#define _RPAGE_RPN41 0x0020000000000000UL |
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|
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/* Max physical address bit as per radix table */ |
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#define _RPAGE_PA_MAX 56 |
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|
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/* |
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* Max physical address bit we will use for now. |
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* |
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* This is mostly a hardware limitation and for now Power9 has |
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* a 51 bit limit. |
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* |
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* This is different from the number of physical bit required to address |
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* the last byte of memory. That is defined by MAX_PHYSMEM_BITS. |
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* MAX_PHYSMEM_BITS is a linux limitation imposed by the maximum |
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* number of sections we can support (SECTIONS_SHIFT). |
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* |
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* This is different from Radix page table limitation above and |
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* should always be less than that. The limit is done such that |
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* we can overload the bits between _RPAGE_PA_MAX and _PAGE_PA_MAX |
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* for hash linux page table specific bits. |
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* |
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* In order to be compatible with future hardware generations we keep |
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* some offsets and limit this for now to 53 |
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*/ |
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#define _PAGE_PA_MAX 53 |
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#define _PAGE_SOFT_DIRTY _RPAGE_SW3 /* software: software dirty tracking */ |
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#define _PAGE_SPECIAL _RPAGE_SW2 /* software: special page */ |
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#define _PAGE_DEVMAP _RPAGE_SW1 /* software: ZONE_DEVICE page */ |
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|
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/* |
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* Drivers request for cache inhibited pte mapping using _PAGE_NO_CACHE |
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* Instead of fixing all of them, add an alternate define which |
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* maps CI pte mapping. |
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*/ |
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#define _PAGE_NO_CACHE _PAGE_TOLERANT |
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/* |
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* We support _RPAGE_PA_MAX bit real address in pte. On the linux side |
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* we are limited by _PAGE_PA_MAX. Clear everything above _PAGE_PA_MAX |
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* and every thing below PAGE_SHIFT; |
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*/ |
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#define PTE_RPN_MASK (((1UL << _PAGE_PA_MAX) - 1) & (PAGE_MASK)) |
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/* |
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* set of bits not changed in pmd_modify. Even though we have hash specific bits |
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* in here, on radix we expect them to be zero. |
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*/ |
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#define _HPAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \ |
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_PAGE_ACCESSED | H_PAGE_THP_HUGE | _PAGE_PTE | \ |
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_PAGE_SOFT_DIRTY | _PAGE_DEVMAP) |
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/* |
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* user access blocked by key |
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*/ |
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#define _PAGE_KERNEL_RW (_PAGE_PRIVILEGED | _PAGE_RW | _PAGE_DIRTY) |
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#define _PAGE_KERNEL_RO (_PAGE_PRIVILEGED | _PAGE_READ) |
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#define _PAGE_KERNEL_ROX (_PAGE_PRIVILEGED | _PAGE_READ | _PAGE_EXEC) |
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#define _PAGE_KERNEL_RWX (_PAGE_PRIVILEGED | _PAGE_DIRTY | \ |
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_PAGE_RW | _PAGE_EXEC) |
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/* |
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* _PAGE_CHG_MASK masks of bits that are to be preserved across |
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* pgprot changes |
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*/ |
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#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \ |
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_PAGE_ACCESSED | _PAGE_SPECIAL | _PAGE_PTE | \ |
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_PAGE_SOFT_DIRTY | _PAGE_DEVMAP) |
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|
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/* |
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* We define 2 sets of base prot bits, one for basic pages (ie, |
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* cacheable kernel and user pages) and one for non cacheable |
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* pages. We always set _PAGE_COHERENT when SMP is enabled or |
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* the processor might need it for DMA coherency. |
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*/ |
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#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED) |
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#define _PAGE_BASE (_PAGE_BASE_NC) |
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|
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/* Permission masks used to generate the __P and __S table, |
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* |
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* Note:__pgprot is defined in arch/powerpc/include/asm/page.h |
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* |
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* Write permissions imply read permissions for now (we could make write-only |
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* pages on BookE but we don't bother for now). Execute permission control is |
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* possible on platforms that define _PAGE_EXEC |
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*/ |
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#define PAGE_NONE __pgprot(_PAGE_BASE | _PAGE_PRIVILEGED) |
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#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_RW) |
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#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_EXEC) |
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#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_READ) |
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#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_EXEC) |
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#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_READ) |
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#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_EXEC) |
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|
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/* Permission masks used for kernel mappings */ |
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#define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW) |
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#define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \ |
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_PAGE_TOLERANT) |
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#define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \ |
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_PAGE_NON_IDEMPOTENT) |
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#define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX) |
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#define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO) |
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#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX) |
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/* |
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* Protection used for kernel text. We want the debuggers to be able to |
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* set breakpoints anywhere, so don't write protect the kernel text |
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* on platforms where such control is possible. |
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*/ |
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#if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) || \ |
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defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE) |
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#define PAGE_KERNEL_TEXT PAGE_KERNEL_X |
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#else |
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#define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX |
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#endif |
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/* Make modules code happy. We don't set RO yet */ |
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#define PAGE_KERNEL_EXEC PAGE_KERNEL_X |
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#define PAGE_AGP (PAGE_KERNEL_NC) |
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#ifndef __ASSEMBLY__ |
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/* |
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* page table defines |
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*/ |
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extern unsigned long __pte_index_size; |
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extern unsigned long __pmd_index_size; |
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extern unsigned long __pud_index_size; |
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extern unsigned long __pgd_index_size; |
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extern unsigned long __pud_cache_index; |
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#define PTE_INDEX_SIZE __pte_index_size |
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#define PMD_INDEX_SIZE __pmd_index_size |
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#define PUD_INDEX_SIZE __pud_index_size |
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#define PGD_INDEX_SIZE __pgd_index_size |
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/* pmd table use page table fragments */ |
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#define PMD_CACHE_INDEX 0 |
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#define PUD_CACHE_INDEX __pud_cache_index |
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/* |
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* Because of use of pte fragments and THP, size of page table |
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* are not always derived out of index size above. |
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*/ |
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extern unsigned long __pte_table_size; |
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extern unsigned long __pmd_table_size; |
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extern unsigned long __pud_table_size; |
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extern unsigned long __pgd_table_size; |
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#define PTE_TABLE_SIZE __pte_table_size |
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#define PMD_TABLE_SIZE __pmd_table_size |
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#define PUD_TABLE_SIZE __pud_table_size |
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#define PGD_TABLE_SIZE __pgd_table_size |
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extern unsigned long __pmd_val_bits; |
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extern unsigned long __pud_val_bits; |
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extern unsigned long __pgd_val_bits; |
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#define PMD_VAL_BITS __pmd_val_bits |
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#define PUD_VAL_BITS __pud_val_bits |
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#define PGD_VAL_BITS __pgd_val_bits |
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extern unsigned long __pte_frag_nr; |
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#define PTE_FRAG_NR __pte_frag_nr |
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extern unsigned long __pte_frag_size_shift; |
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#define PTE_FRAG_SIZE_SHIFT __pte_frag_size_shift |
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#define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT) |
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extern unsigned long __pmd_frag_nr; |
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#define PMD_FRAG_NR __pmd_frag_nr |
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extern unsigned long __pmd_frag_size_shift; |
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#define PMD_FRAG_SIZE_SHIFT __pmd_frag_size_shift |
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#define PMD_FRAG_SIZE (1UL << PMD_FRAG_SIZE_SHIFT) |
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#define PTRS_PER_PTE (1 << PTE_INDEX_SIZE) |
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#define PTRS_PER_PMD (1 << PMD_INDEX_SIZE) |
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#define PTRS_PER_PUD (1 << PUD_INDEX_SIZE) |
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#define PTRS_PER_PGD (1 << PGD_INDEX_SIZE) |
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#define MAX_PTRS_PER_PGD (1 << (H_PGD_INDEX_SIZE > RADIX_PGD_INDEX_SIZE ? \ |
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H_PGD_INDEX_SIZE : RADIX_PGD_INDEX_SIZE)) |
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/* PMD_SHIFT determines what a second-level page table entry can map */ |
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#define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE) |
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#define PMD_SIZE (1UL << PMD_SHIFT) |
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#define PMD_MASK (~(PMD_SIZE-1)) |
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/* PUD_SHIFT determines what a third-level page table entry can map */ |
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#define PUD_SHIFT (PMD_SHIFT + PMD_INDEX_SIZE) |
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#define PUD_SIZE (1UL << PUD_SHIFT) |
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#define PUD_MASK (~(PUD_SIZE-1)) |
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|
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/* PGDIR_SHIFT determines what a fourth-level page table entry can map */ |
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#define PGDIR_SHIFT (PUD_SHIFT + PUD_INDEX_SIZE) |
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
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#define PGDIR_MASK (~(PGDIR_SIZE-1)) |
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/* Bits to mask out from a PMD to get to the PTE page */ |
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#define PMD_MASKED_BITS 0xc0000000000000ffUL |
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/* Bits to mask out from a PUD to get to the PMD page */ |
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#define PUD_MASKED_BITS 0xc0000000000000ffUL |
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/* Bits to mask out from a PGD to get to the PUD page */ |
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#define P4D_MASKED_BITS 0xc0000000000000ffUL |
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/* |
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* Used as an indicator for rcu callback functions |
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*/ |
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enum pgtable_index { |
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PTE_INDEX = 0, |
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PMD_INDEX, |
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PUD_INDEX, |
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PGD_INDEX, |
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/* |
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* Below are used with 4k page size and hugetlb |
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*/ |
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HTLB_16M_INDEX, |
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HTLB_16G_INDEX, |
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}; |
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extern unsigned long __vmalloc_start; |
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extern unsigned long __vmalloc_end; |
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#define VMALLOC_START __vmalloc_start |
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#define VMALLOC_END __vmalloc_end |
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static inline unsigned int ioremap_max_order(void) |
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{ |
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if (radix_enabled()) |
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return PUD_SHIFT; |
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return 7 + PAGE_SHIFT; /* default from linux/vmalloc.h */ |
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} |
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#define IOREMAP_MAX_ORDER ioremap_max_order() |
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extern unsigned long __kernel_virt_start; |
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extern unsigned long __kernel_io_start; |
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extern unsigned long __kernel_io_end; |
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#define KERN_VIRT_START __kernel_virt_start |
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#define KERN_IO_START __kernel_io_start |
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#define KERN_IO_END __kernel_io_end |
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extern struct page *vmemmap; |
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extern unsigned long pci_io_base; |
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#endif /* __ASSEMBLY__ */ |
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#include <asm/book3s/64/hash.h> |
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#include <asm/book3s/64/radix.h> |
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#if H_MAX_PHYSMEM_BITS > R_MAX_PHYSMEM_BITS |
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#define MAX_PHYSMEM_BITS H_MAX_PHYSMEM_BITS |
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#else |
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#define MAX_PHYSMEM_BITS R_MAX_PHYSMEM_BITS |
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#endif |
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#ifdef CONFIG_PPC_64K_PAGES |
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#include <asm/book3s/64/pgtable-64k.h> |
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#else |
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#include <asm/book3s/64/pgtable-4k.h> |
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#endif |
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#include <asm/barrier.h> |
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/* |
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* IO space itself carved into the PIO region (ISA and PHB IO space) and |
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* the ioremap space |
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* |
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* ISA_IO_BASE = KERN_IO_START, 64K reserved area |
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* PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces |
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* IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE |
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*/ |
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#define FULL_IO_SIZE 0x80000000ul |
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#define ISA_IO_BASE (KERN_IO_START) |
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#define ISA_IO_END (KERN_IO_START + 0x10000ul) |
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#define PHB_IO_BASE (ISA_IO_END) |
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#define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE) |
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#define IOREMAP_BASE (PHB_IO_END) |
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#define IOREMAP_START (ioremap_bot) |
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#define IOREMAP_END (KERN_IO_END - FIXADDR_SIZE) |
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#define FIXADDR_SIZE SZ_32M |
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|
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/* Advertise special mapping type for AGP */ |
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#define HAVE_PAGE_AGP |
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#ifndef __ASSEMBLY__ |
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/* |
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* This is the default implementation of various PTE accessors, it's |
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* used in all cases except Book3S with 64K pages where we have a |
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* concept of sub-pages |
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*/ |
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#ifndef __real_pte |
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#define __real_pte(e, p, o) ((real_pte_t){(e)}) |
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#define __rpte_to_pte(r) ((r).pte) |
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#define __rpte_to_hidx(r,index) (pte_val(__rpte_to_pte(r)) >> H_PAGE_F_GIX_SHIFT) |
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#define pte_iterate_hashed_subpages(rpte, psize, va, index, shift) \ |
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do { \ |
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index = 0; \ |
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shift = mmu_psize_defs[psize].shift; \ |
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#define pte_iterate_hashed_end() } while(0) |
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/* |
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* We expect this to be called only for user addresses or kernel virtual |
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* addresses other than the linear mapping. |
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*/ |
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#define pte_pagesize_index(mm, addr, pte) MMU_PAGE_4K |
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#endif /* __real_pte */ |
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static inline unsigned long pte_update(struct mm_struct *mm, unsigned long addr, |
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pte_t *ptep, unsigned long clr, |
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unsigned long set, int huge) |
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{ |
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if (radix_enabled()) |
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return radix__pte_update(mm, addr, ptep, clr, set, huge); |
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return hash__pte_update(mm, addr, ptep, clr, set, huge); |
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} |
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/* |
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* For hash even if we have _PAGE_ACCESSED = 0, we do a pte_update. |
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* We currently remove entries from the hashtable regardless of whether |
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* the entry was young or dirty. |
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* |
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* We should be more intelligent about this but for the moment we override |
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* these functions and force a tlb flush unconditionally |
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* For radix: H_PAGE_HASHPTE should be zero. Hence we can use the same |
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* function for both hash and radix. |
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*/ |
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static inline int __ptep_test_and_clear_young(struct mm_struct *mm, |
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unsigned long addr, pte_t *ptep) |
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{ |
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unsigned long old; |
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|
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if ((pte_raw(*ptep) & cpu_to_be64(_PAGE_ACCESSED | H_PAGE_HASHPTE)) == 0) |
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return 0; |
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old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0); |
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return (old & _PAGE_ACCESSED) != 0; |
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} |
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#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG |
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#define ptep_test_and_clear_young(__vma, __addr, __ptep) \ |
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({ \ |
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__ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \ |
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}) |
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|
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/* |
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* On Book3S CPUs, clearing the accessed bit without a TLB flush |
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* doesn't cause data corruption. [ It could cause incorrect |
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* page aging and the (mistaken) reclaim of hot pages, but the |
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* chance of that should be relatively low. ] |
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* |
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* So as a performance optimization don't flush the TLB when |
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* clearing the accessed bit, it will eventually be flushed by |
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* a context switch or a VM operation anyway. [ In the rare |
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* event of it not getting flushed for a long time the delay |
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* shouldn't really matter because there's no real memory |
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* pressure for swapout to react to. ] |
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*/ |
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#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH |
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#define ptep_clear_flush_young ptep_test_and_clear_young |
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|
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#define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH |
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#define pmdp_clear_flush_young pmdp_test_and_clear_young |
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|
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static inline int __pte_write(pte_t pte) |
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{ |
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return !!(pte_raw(pte) & cpu_to_be64(_PAGE_WRITE)); |
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} |
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|
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#ifdef CONFIG_NUMA_BALANCING |
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#define pte_savedwrite pte_savedwrite |
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static inline bool pte_savedwrite(pte_t pte) |
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{ |
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/* |
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* Saved write ptes are prot none ptes that doesn't have |
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* privileged bit sit. We mark prot none as one which has |
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* present and pviliged bit set and RWX cleared. To mark |
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* protnone which used to have _PAGE_WRITE set we clear |
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* the privileged bit. |
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*/ |
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return !(pte_raw(pte) & cpu_to_be64(_PAGE_RWX | _PAGE_PRIVILEGED)); |
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} |
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#else |
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#define pte_savedwrite pte_savedwrite |
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static inline bool pte_savedwrite(pte_t pte) |
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{ |
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return false; |
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} |
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#endif |
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|
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static inline int pte_write(pte_t pte) |
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{ |
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return __pte_write(pte) || pte_savedwrite(pte); |
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} |
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|
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static inline int pte_read(pte_t pte) |
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{ |
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return !!(pte_raw(pte) & cpu_to_be64(_PAGE_READ)); |
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} |
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|
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#define __HAVE_ARCH_PTEP_SET_WRPROTECT |
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static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, |
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pte_t *ptep) |
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{ |
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if (__pte_write(*ptep)) |
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pte_update(mm, addr, ptep, _PAGE_WRITE, 0, 0); |
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else if (unlikely(pte_savedwrite(*ptep))) |
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pte_update(mm, addr, ptep, 0, _PAGE_PRIVILEGED, 0); |
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} |
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|
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#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT |
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static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, |
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unsigned long addr, pte_t *ptep) |
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{ |
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/* |
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* We should not find protnone for hugetlb, but this complete the |
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* interface. |
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*/ |
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if (__pte_write(*ptep)) |
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pte_update(mm, addr, ptep, _PAGE_WRITE, 0, 1); |
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else if (unlikely(pte_savedwrite(*ptep))) |
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pte_update(mm, addr, ptep, 0, _PAGE_PRIVILEGED, 1); |
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} |
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|
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#define __HAVE_ARCH_PTEP_GET_AND_CLEAR |
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static inline pte_t ptep_get_and_clear(struct mm_struct *mm, |
|
unsigned long addr, pte_t *ptep) |
|
{ |
|
unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0); |
|
return __pte(old); |
|
} |
|
|
|
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL |
|
static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, |
|
unsigned long addr, |
|
pte_t *ptep, int full) |
|
{ |
|
if (full && radix_enabled()) { |
|
/* |
|
* We know that this is a full mm pte clear and |
|
* hence can be sure there is no parallel set_pte. |
|
*/ |
|
return radix__ptep_get_and_clear_full(mm, addr, ptep, full); |
|
} |
|
return ptep_get_and_clear(mm, addr, ptep); |
|
} |
|
|
|
|
|
static inline void pte_clear(struct mm_struct *mm, unsigned long addr, |
|
pte_t * ptep) |
|
{ |
|
pte_update(mm, addr, ptep, ~0UL, 0, 0); |
|
} |
|
|
|
static inline int pte_dirty(pte_t pte) |
|
{ |
|
return !!(pte_raw(pte) & cpu_to_be64(_PAGE_DIRTY)); |
|
} |
|
|
|
static inline int pte_young(pte_t pte) |
|
{ |
|
return !!(pte_raw(pte) & cpu_to_be64(_PAGE_ACCESSED)); |
|
} |
|
|
|
static inline int pte_special(pte_t pte) |
|
{ |
|
return !!(pte_raw(pte) & cpu_to_be64(_PAGE_SPECIAL)); |
|
} |
|
|
|
static inline bool pte_exec(pte_t pte) |
|
{ |
|
return !!(pte_raw(pte) & cpu_to_be64(_PAGE_EXEC)); |
|
} |
|
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY |
|
static inline bool pte_soft_dirty(pte_t pte) |
|
{ |
|
return !!(pte_raw(pte) & cpu_to_be64(_PAGE_SOFT_DIRTY)); |
|
} |
|
|
|
static inline pte_t pte_mksoft_dirty(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SOFT_DIRTY)); |
|
} |
|
|
|
static inline pte_t pte_clear_soft_dirty(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_SOFT_DIRTY)); |
|
} |
|
#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ |
|
|
|
#ifdef CONFIG_NUMA_BALANCING |
|
static inline int pte_protnone(pte_t pte) |
|
{ |
|
return (pte_raw(pte) & cpu_to_be64(_PAGE_PRESENT | _PAGE_PTE | _PAGE_RWX)) == |
|
cpu_to_be64(_PAGE_PRESENT | _PAGE_PTE); |
|
} |
|
|
|
#define pte_mk_savedwrite pte_mk_savedwrite |
|
static inline pte_t pte_mk_savedwrite(pte_t pte) |
|
{ |
|
/* |
|
* Used by Autonuma subsystem to preserve the write bit |
|
* while marking the pte PROT_NONE. Only allow this |
|
* on PROT_NONE pte |
|
*/ |
|
VM_BUG_ON((pte_raw(pte) & cpu_to_be64(_PAGE_PRESENT | _PAGE_RWX | _PAGE_PRIVILEGED)) != |
|
cpu_to_be64(_PAGE_PRESENT | _PAGE_PRIVILEGED)); |
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_PRIVILEGED)); |
|
} |
|
|
|
#define pte_clear_savedwrite pte_clear_savedwrite |
|
static inline pte_t pte_clear_savedwrite(pte_t pte) |
|
{ |
|
/* |
|
* Used by KSM subsystem to make a protnone pte readonly. |
|
*/ |
|
VM_BUG_ON(!pte_protnone(pte)); |
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_PRIVILEGED)); |
|
} |
|
#else |
|
#define pte_clear_savedwrite pte_clear_savedwrite |
|
static inline pte_t pte_clear_savedwrite(pte_t pte) |
|
{ |
|
VM_WARN_ON(1); |
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_WRITE)); |
|
} |
|
#endif /* CONFIG_NUMA_BALANCING */ |
|
|
|
static inline bool pte_hw_valid(pte_t pte) |
|
{ |
|
return (pte_raw(pte) & cpu_to_be64(_PAGE_PRESENT | _PAGE_PTE)) == |
|
cpu_to_be64(_PAGE_PRESENT | _PAGE_PTE); |
|
} |
|
|
|
static inline int pte_present(pte_t pte) |
|
{ |
|
/* |
|
* A pte is considerent present if _PAGE_PRESENT is set. |
|
* We also need to consider the pte present which is marked |
|
* invalid during ptep_set_access_flags. Hence we look for _PAGE_INVALID |
|
* if we find _PAGE_PRESENT cleared. |
|
*/ |
|
|
|
if (pte_hw_valid(pte)) |
|
return true; |
|
return (pte_raw(pte) & cpu_to_be64(_PAGE_INVALID | _PAGE_PTE)) == |
|
cpu_to_be64(_PAGE_INVALID | _PAGE_PTE); |
|
} |
|
|
|
#ifdef CONFIG_PPC_MEM_KEYS |
|
extern bool arch_pte_access_permitted(u64 pte, bool write, bool execute); |
|
#else |
|
static inline bool arch_pte_access_permitted(u64 pte, bool write, bool execute) |
|
{ |
|
return true; |
|
} |
|
#endif /* CONFIG_PPC_MEM_KEYS */ |
|
|
|
static inline bool pte_user(pte_t pte) |
|
{ |
|
return !(pte_raw(pte) & cpu_to_be64(_PAGE_PRIVILEGED)); |
|
} |
|
|
|
#define pte_access_permitted pte_access_permitted |
|
static inline bool pte_access_permitted(pte_t pte, bool write) |
|
{ |
|
/* |
|
* _PAGE_READ is needed for any access and will be |
|
* cleared for PROT_NONE |
|
*/ |
|
if (!pte_present(pte) || !pte_user(pte) || !pte_read(pte)) |
|
return false; |
|
|
|
if (write && !pte_write(pte)) |
|
return false; |
|
|
|
return arch_pte_access_permitted(pte_val(pte), write, 0); |
|
} |
|
|
|
/* |
|
* Conversion functions: convert a page and protection to a page entry, |
|
* and a page entry and page directory to the page they refer to. |
|
* |
|
* Even if PTEs can be unsigned long long, a PFN is always an unsigned |
|
* long for now. |
|
*/ |
|
static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot) |
|
{ |
|
VM_BUG_ON(pfn >> (64 - PAGE_SHIFT)); |
|
VM_BUG_ON((pfn << PAGE_SHIFT) & ~PTE_RPN_MASK); |
|
|
|
return __pte(((pte_basic_t)pfn << PAGE_SHIFT) | pgprot_val(pgprot) | _PAGE_PTE); |
|
} |
|
|
|
static inline unsigned long pte_pfn(pte_t pte) |
|
{ |
|
return (pte_val(pte) & PTE_RPN_MASK) >> PAGE_SHIFT; |
|
} |
|
|
|
/* Generic modifiers for PTE bits */ |
|
static inline pte_t pte_wrprotect(pte_t pte) |
|
{ |
|
if (unlikely(pte_savedwrite(pte))) |
|
return pte_clear_savedwrite(pte); |
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_WRITE)); |
|
} |
|
|
|
static inline pte_t pte_exprotect(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_EXEC)); |
|
} |
|
|
|
static inline pte_t pte_mkclean(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_DIRTY)); |
|
} |
|
|
|
static inline pte_t pte_mkold(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_ACCESSED)); |
|
} |
|
|
|
static inline pte_t pte_mkexec(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_EXEC)); |
|
} |
|
|
|
static inline pte_t pte_mkwrite(pte_t pte) |
|
{ |
|
/* |
|
* write implies read, hence set both |
|
*/ |
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_RW)); |
|
} |
|
|
|
static inline pte_t pte_mkdirty(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_DIRTY | _PAGE_SOFT_DIRTY)); |
|
} |
|
|
|
static inline pte_t pte_mkyoung(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_ACCESSED)); |
|
} |
|
|
|
static inline pte_t pte_mkspecial(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SPECIAL)); |
|
} |
|
|
|
static inline pte_t pte_mkhuge(pte_t pte) |
|
{ |
|
return pte; |
|
} |
|
|
|
static inline pte_t pte_mkdevmap(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SPECIAL | _PAGE_DEVMAP)); |
|
} |
|
|
|
static inline pte_t pte_mkprivileged(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_PRIVILEGED)); |
|
} |
|
|
|
static inline pte_t pte_mkuser(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_PRIVILEGED)); |
|
} |
|
|
|
/* |
|
* This is potentially called with a pmd as the argument, in which case it's not |
|
* safe to check _PAGE_DEVMAP unless we also confirm that _PAGE_PTE is set. |
|
* That's because the bit we use for _PAGE_DEVMAP is not reserved for software |
|
* use in page directory entries (ie. non-ptes). |
|
*/ |
|
static inline int pte_devmap(pte_t pte) |
|
{ |
|
u64 mask = cpu_to_be64(_PAGE_DEVMAP | _PAGE_PTE); |
|
|
|
return (pte_raw(pte) & mask) == mask; |
|
} |
|
|
|
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
|
{ |
|
/* FIXME!! check whether this need to be a conditional */ |
|
return __pte_raw((pte_raw(pte) & cpu_to_be64(_PAGE_CHG_MASK)) | |
|
cpu_to_be64(pgprot_val(newprot))); |
|
} |
|
|
|
/* Encode and de-code a swap entry */ |
|
#define MAX_SWAPFILES_CHECK() do { \ |
|
BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \ |
|
/* \ |
|
* Don't have overlapping bits with _PAGE_HPTEFLAGS \ |
|
* We filter HPTEFLAGS on set_pte. \ |
|
*/ \ |
|
BUILD_BUG_ON(_PAGE_HPTEFLAGS & (0x1f << _PAGE_BIT_SWAP_TYPE)); \ |
|
BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_SOFT_DIRTY); \ |
|
} while (0) |
|
|
|
#define SWP_TYPE_BITS 5 |
|
#define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \ |
|
& ((1UL << SWP_TYPE_BITS) - 1)) |
|
#define __swp_offset(x) (((x).val & PTE_RPN_MASK) >> PAGE_SHIFT) |
|
#define __swp_entry(type, offset) ((swp_entry_t) { \ |
|
((type) << _PAGE_BIT_SWAP_TYPE) \ |
|
| (((offset) << PAGE_SHIFT) & PTE_RPN_MASK)}) |
|
/* |
|
* swp_entry_t must be independent of pte bits. We build a swp_entry_t from |
|
* swap type and offset we get from swap and convert that to pte to find a |
|
* matching pte in linux page table. |
|
* Clear bits not found in swap entries here. |
|
*/ |
|
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) & ~_PAGE_PTE }) |
|
#define __swp_entry_to_pte(x) __pte((x).val | _PAGE_PTE) |
|
#define __pmd_to_swp_entry(pmd) (__pte_to_swp_entry(pmd_pte(pmd))) |
|
#define __swp_entry_to_pmd(x) (pte_pmd(__swp_entry_to_pte(x))) |
|
|
|
#ifdef CONFIG_MEM_SOFT_DIRTY |
|
#define _PAGE_SWP_SOFT_DIRTY (1UL << (SWP_TYPE_BITS + _PAGE_BIT_SWAP_TYPE)) |
|
#else |
|
#define _PAGE_SWP_SOFT_DIRTY 0UL |
|
#endif /* CONFIG_MEM_SOFT_DIRTY */ |
|
|
|
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY |
|
static inline pte_t pte_swp_mksoft_dirty(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SWP_SOFT_DIRTY)); |
|
} |
|
|
|
static inline bool pte_swp_soft_dirty(pte_t pte) |
|
{ |
|
return !!(pte_raw(pte) & cpu_to_be64(_PAGE_SWP_SOFT_DIRTY)); |
|
} |
|
|
|
static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) |
|
{ |
|
return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_SWP_SOFT_DIRTY)); |
|
} |
|
#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ |
|
|
|
static inline bool check_pte_access(unsigned long access, unsigned long ptev) |
|
{ |
|
/* |
|
* This check for _PAGE_RWX and _PAGE_PRESENT bits |
|
*/ |
|
if (access & ~ptev) |
|
return false; |
|
/* |
|
* This check for access to privilege space |
|
*/ |
|
if ((access & _PAGE_PRIVILEGED) != (ptev & _PAGE_PRIVILEGED)) |
|
return false; |
|
|
|
return true; |
|
} |
|
/* |
|
* Generic functions with hash/radix callbacks |
|
*/ |
|
|
|
static inline void __ptep_set_access_flags(struct vm_area_struct *vma, |
|
pte_t *ptep, pte_t entry, |
|
unsigned long address, |
|
int psize) |
|
{ |
|
if (radix_enabled()) |
|
return radix__ptep_set_access_flags(vma, ptep, entry, |
|
address, psize); |
|
return hash__ptep_set_access_flags(ptep, entry); |
|
} |
|
|
|
#define __HAVE_ARCH_PTE_SAME |
|
static inline int pte_same(pte_t pte_a, pte_t pte_b) |
|
{ |
|
if (radix_enabled()) |
|
return radix__pte_same(pte_a, pte_b); |
|
return hash__pte_same(pte_a, pte_b); |
|
} |
|
|
|
static inline int pte_none(pte_t pte) |
|
{ |
|
if (radix_enabled()) |
|
return radix__pte_none(pte); |
|
return hash__pte_none(pte); |
|
} |
|
|
|
static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr, |
|
pte_t *ptep, pte_t pte, int percpu) |
|
{ |
|
|
|
VM_WARN_ON(!(pte_raw(pte) & cpu_to_be64(_PAGE_PTE))); |
|
/* |
|
* Keep the _PAGE_PTE added till we are sure we handle _PAGE_PTE |
|
* in all the callers. |
|
*/ |
|
pte = __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_PTE)); |
|
|
|
if (radix_enabled()) |
|
return radix__set_pte_at(mm, addr, ptep, pte, percpu); |
|
return hash__set_pte_at(mm, addr, ptep, pte, percpu); |
|
} |
|
|
|
#define _PAGE_CACHE_CTL (_PAGE_SAO | _PAGE_NON_IDEMPOTENT | _PAGE_TOLERANT) |
|
|
|
#define pgprot_noncached pgprot_noncached |
|
static inline pgprot_t pgprot_noncached(pgprot_t prot) |
|
{ |
|
return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | |
|
_PAGE_NON_IDEMPOTENT); |
|
} |
|
|
|
#define pgprot_noncached_wc pgprot_noncached_wc |
|
static inline pgprot_t pgprot_noncached_wc(pgprot_t prot) |
|
{ |
|
return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | |
|
_PAGE_TOLERANT); |
|
} |
|
|
|
#define pgprot_cached pgprot_cached |
|
static inline pgprot_t pgprot_cached(pgprot_t prot) |
|
{ |
|
return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL)); |
|
} |
|
|
|
#define pgprot_writecombine pgprot_writecombine |
|
static inline pgprot_t pgprot_writecombine(pgprot_t prot) |
|
{ |
|
return pgprot_noncached_wc(prot); |
|
} |
|
/* |
|
* check a pte mapping have cache inhibited property |
|
*/ |
|
static inline bool pte_ci(pte_t pte) |
|
{ |
|
__be64 pte_v = pte_raw(pte); |
|
|
|
if (((pte_v & cpu_to_be64(_PAGE_CACHE_CTL)) == cpu_to_be64(_PAGE_TOLERANT)) || |
|
((pte_v & cpu_to_be64(_PAGE_CACHE_CTL)) == cpu_to_be64(_PAGE_NON_IDEMPOTENT))) |
|
return true; |
|
return false; |
|
} |
|
|
|
static inline void pmd_clear(pmd_t *pmdp) |
|
{ |
|
if (IS_ENABLED(CONFIG_DEBUG_VM) && !radix_enabled()) { |
|
/* |
|
* Don't use this if we can possibly have a hash page table |
|
* entry mapping this. |
|
*/ |
|
WARN_ON((pmd_val(*pmdp) & (H_PAGE_HASHPTE | _PAGE_PTE)) == (H_PAGE_HASHPTE | _PAGE_PTE)); |
|
} |
|
*pmdp = __pmd(0); |
|
} |
|
|
|
static inline int pmd_none(pmd_t pmd) |
|
{ |
|
return !pmd_raw(pmd); |
|
} |
|
|
|
static inline int pmd_present(pmd_t pmd) |
|
{ |
|
/* |
|
* A pmd is considerent present if _PAGE_PRESENT is set. |
|
* We also need to consider the pmd present which is marked |
|
* invalid during a split. Hence we look for _PAGE_INVALID |
|
* if we find _PAGE_PRESENT cleared. |
|
*/ |
|
if (pmd_raw(pmd) & cpu_to_be64(_PAGE_PRESENT | _PAGE_INVALID)) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
static inline int pmd_is_serializing(pmd_t pmd) |
|
{ |
|
/* |
|
* If the pmd is undergoing a split, the _PAGE_PRESENT bit is clear |
|
* and _PAGE_INVALID is set (see pmd_present, pmdp_invalidate). |
|
* |
|
* This condition may also occur when flushing a pmd while flushing |
|
* it (see ptep_modify_prot_start), so callers must ensure this |
|
* case is fine as well. |
|
*/ |
|
if ((pmd_raw(pmd) & cpu_to_be64(_PAGE_PRESENT | _PAGE_INVALID)) == |
|
cpu_to_be64(_PAGE_INVALID)) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
static inline int pmd_bad(pmd_t pmd) |
|
{ |
|
if (radix_enabled()) |
|
return radix__pmd_bad(pmd); |
|
return hash__pmd_bad(pmd); |
|
} |
|
|
|
static inline void pud_clear(pud_t *pudp) |
|
{ |
|
if (IS_ENABLED(CONFIG_DEBUG_VM) && !radix_enabled()) { |
|
/* |
|
* Don't use this if we can possibly have a hash page table |
|
* entry mapping this. |
|
*/ |
|
WARN_ON((pud_val(*pudp) & (H_PAGE_HASHPTE | _PAGE_PTE)) == (H_PAGE_HASHPTE | _PAGE_PTE)); |
|
} |
|
*pudp = __pud(0); |
|
} |
|
|
|
static inline int pud_none(pud_t pud) |
|
{ |
|
return !pud_raw(pud); |
|
} |
|
|
|
static inline int pud_present(pud_t pud) |
|
{ |
|
return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PRESENT)); |
|
} |
|
|
|
extern struct page *pud_page(pud_t pud); |
|
extern struct page *pmd_page(pmd_t pmd); |
|
static inline pte_t pud_pte(pud_t pud) |
|
{ |
|
return __pte_raw(pud_raw(pud)); |
|
} |
|
|
|
static inline pud_t pte_pud(pte_t pte) |
|
{ |
|
return __pud_raw(pte_raw(pte)); |
|
} |
|
#define pud_write(pud) pte_write(pud_pte(pud)) |
|
|
|
static inline int pud_bad(pud_t pud) |
|
{ |
|
if (radix_enabled()) |
|
return radix__pud_bad(pud); |
|
return hash__pud_bad(pud); |
|
} |
|
|
|
#define pud_access_permitted pud_access_permitted |
|
static inline bool pud_access_permitted(pud_t pud, bool write) |
|
{ |
|
return pte_access_permitted(pud_pte(pud), write); |
|
} |
|
|
|
#define __p4d_raw(x) ((p4d_t) { __pgd_raw(x) }) |
|
static inline __be64 p4d_raw(p4d_t x) |
|
{ |
|
return pgd_raw(x.pgd); |
|
} |
|
|
|
#define p4d_write(p4d) pte_write(p4d_pte(p4d)) |
|
|
|
static inline void p4d_clear(p4d_t *p4dp) |
|
{ |
|
*p4dp = __p4d(0); |
|
} |
|
|
|
static inline int p4d_none(p4d_t p4d) |
|
{ |
|
return !p4d_raw(p4d); |
|
} |
|
|
|
static inline int p4d_present(p4d_t p4d) |
|
{ |
|
return !!(p4d_raw(p4d) & cpu_to_be64(_PAGE_PRESENT)); |
|
} |
|
|
|
static inline pte_t p4d_pte(p4d_t p4d) |
|
{ |
|
return __pte_raw(p4d_raw(p4d)); |
|
} |
|
|
|
static inline p4d_t pte_p4d(pte_t pte) |
|
{ |
|
return __p4d_raw(pte_raw(pte)); |
|
} |
|
|
|
static inline int p4d_bad(p4d_t p4d) |
|
{ |
|
if (radix_enabled()) |
|
return radix__p4d_bad(p4d); |
|
return hash__p4d_bad(p4d); |
|
} |
|
|
|
#define p4d_access_permitted p4d_access_permitted |
|
static inline bool p4d_access_permitted(p4d_t p4d, bool write) |
|
{ |
|
return pte_access_permitted(p4d_pte(p4d), write); |
|
} |
|
|
|
extern struct page *p4d_page(p4d_t p4d); |
|
|
|
/* Pointers in the page table tree are physical addresses */ |
|
#define __pgtable_ptr_val(ptr) __pa(ptr) |
|
|
|
static inline pud_t *p4d_pgtable(p4d_t p4d) |
|
{ |
|
return (pud_t *)__va(p4d_val(p4d) & ~P4D_MASKED_BITS); |
|
} |
|
|
|
static inline pmd_t *pud_pgtable(pud_t pud) |
|
{ |
|
return (pmd_t *)__va(pud_val(pud) & ~PUD_MASKED_BITS); |
|
} |
|
|
|
#define pte_ERROR(e) \ |
|
pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) |
|
#define pmd_ERROR(e) \ |
|
pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) |
|
#define pud_ERROR(e) \ |
|
pr_err("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e)) |
|
#define pgd_ERROR(e) \ |
|
pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) |
|
|
|
static inline int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot) |
|
{ |
|
if (radix_enabled()) { |
|
#if defined(CONFIG_PPC_RADIX_MMU) && defined(DEBUG_VM) |
|
unsigned long page_size = 1 << mmu_psize_defs[mmu_io_psize].shift; |
|
WARN((page_size != PAGE_SIZE), "I/O page size != PAGE_SIZE"); |
|
#endif |
|
return radix__map_kernel_page(ea, pa, prot, PAGE_SIZE); |
|
} |
|
return hash__map_kernel_page(ea, pa, prot); |
|
} |
|
|
|
static inline int __meminit vmemmap_create_mapping(unsigned long start, |
|
unsigned long page_size, |
|
unsigned long phys) |
|
{ |
|
if (radix_enabled()) |
|
return radix__vmemmap_create_mapping(start, page_size, phys); |
|
return hash__vmemmap_create_mapping(start, page_size, phys); |
|
} |
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG |
|
static inline void vmemmap_remove_mapping(unsigned long start, |
|
unsigned long page_size) |
|
{ |
|
if (radix_enabled()) |
|
return radix__vmemmap_remove_mapping(start, page_size); |
|
return hash__vmemmap_remove_mapping(start, page_size); |
|
} |
|
#endif |
|
|
|
static inline pte_t pmd_pte(pmd_t pmd) |
|
{ |
|
return __pte_raw(pmd_raw(pmd)); |
|
} |
|
|
|
static inline pmd_t pte_pmd(pte_t pte) |
|
{ |
|
return __pmd_raw(pte_raw(pte)); |
|
} |
|
|
|
static inline pte_t *pmdp_ptep(pmd_t *pmd) |
|
{ |
|
return (pte_t *)pmd; |
|
} |
|
#define pmd_pfn(pmd) pte_pfn(pmd_pte(pmd)) |
|
#define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd)) |
|
#define pmd_young(pmd) pte_young(pmd_pte(pmd)) |
|
#define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd))) |
|
#define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd))) |
|
#define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd))) |
|
#define pmd_mkclean(pmd) pte_pmd(pte_mkclean(pmd_pte(pmd))) |
|
#define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd))) |
|
#define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd))) |
|
#define pmd_mk_savedwrite(pmd) pte_pmd(pte_mk_savedwrite(pmd_pte(pmd))) |
|
#define pmd_clear_savedwrite(pmd) pte_pmd(pte_clear_savedwrite(pmd_pte(pmd))) |
|
|
|
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY |
|
#define pmd_soft_dirty(pmd) pte_soft_dirty(pmd_pte(pmd)) |
|
#define pmd_mksoft_dirty(pmd) pte_pmd(pte_mksoft_dirty(pmd_pte(pmd))) |
|
#define pmd_clear_soft_dirty(pmd) pte_pmd(pte_clear_soft_dirty(pmd_pte(pmd))) |
|
|
|
#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION |
|
#define pmd_swp_mksoft_dirty(pmd) pte_pmd(pte_swp_mksoft_dirty(pmd_pte(pmd))) |
|
#define pmd_swp_soft_dirty(pmd) pte_swp_soft_dirty(pmd_pte(pmd)) |
|
#define pmd_swp_clear_soft_dirty(pmd) pte_pmd(pte_swp_clear_soft_dirty(pmd_pte(pmd))) |
|
#endif |
|
#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ |
|
|
|
#ifdef CONFIG_NUMA_BALANCING |
|
static inline int pmd_protnone(pmd_t pmd) |
|
{ |
|
return pte_protnone(pmd_pte(pmd)); |
|
} |
|
#endif /* CONFIG_NUMA_BALANCING */ |
|
|
|
#define pmd_write(pmd) pte_write(pmd_pte(pmd)) |
|
#define __pmd_write(pmd) __pte_write(pmd_pte(pmd)) |
|
#define pmd_savedwrite(pmd) pte_savedwrite(pmd_pte(pmd)) |
|
|
|
#define pmd_access_permitted pmd_access_permitted |
|
static inline bool pmd_access_permitted(pmd_t pmd, bool write) |
|
{ |
|
/* |
|
* pmdp_invalidate sets this combination (which is not caught by |
|
* !pte_present() check in pte_access_permitted), to prevent |
|
* lock-free lookups, as part of the serialize_against_pte_lookup() |
|
* synchronisation. |
|
* |
|
* This also catches the case where the PTE's hardware PRESENT bit is |
|
* cleared while TLB is flushed, which is suboptimal but should not |
|
* be frequent. |
|
*/ |
|
if (pmd_is_serializing(pmd)) |
|
return false; |
|
|
|
return pte_access_permitted(pmd_pte(pmd), write); |
|
} |
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
|
extern pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot); |
|
extern pmd_t mk_pmd(struct page *page, pgprot_t pgprot); |
|
extern pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot); |
|
extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, |
|
pmd_t *pmdp, pmd_t pmd); |
|
static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, |
|
unsigned long addr, pmd_t *pmd) |
|
{ |
|
} |
|
|
|
extern int hash__has_transparent_hugepage(void); |
|
static inline int has_transparent_hugepage(void) |
|
{ |
|
if (radix_enabled()) |
|
return radix__has_transparent_hugepage(); |
|
return hash__has_transparent_hugepage(); |
|
} |
|
#define has_transparent_hugepage has_transparent_hugepage |
|
|
|
static inline unsigned long |
|
pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, |
|
unsigned long clr, unsigned long set) |
|
{ |
|
if (radix_enabled()) |
|
return radix__pmd_hugepage_update(mm, addr, pmdp, clr, set); |
|
return hash__pmd_hugepage_update(mm, addr, pmdp, clr, set); |
|
} |
|
|
|
/* |
|
* returns true for pmd migration entries, THP, devmap, hugetlb |
|
* But compile time dependent on THP config |
|
*/ |
|
static inline int pmd_large(pmd_t pmd) |
|
{ |
|
return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE)); |
|
} |
|
|
|
/* |
|
* For radix we should always find H_PAGE_HASHPTE zero. Hence |
|
* the below will work for radix too |
|
*/ |
|
static inline int __pmdp_test_and_clear_young(struct mm_struct *mm, |
|
unsigned long addr, pmd_t *pmdp) |
|
{ |
|
unsigned long old; |
|
|
|
if ((pmd_raw(*pmdp) & cpu_to_be64(_PAGE_ACCESSED | H_PAGE_HASHPTE)) == 0) |
|
return 0; |
|
old = pmd_hugepage_update(mm, addr, pmdp, _PAGE_ACCESSED, 0); |
|
return ((old & _PAGE_ACCESSED) != 0); |
|
} |
|
|
|
#define __HAVE_ARCH_PMDP_SET_WRPROTECT |
|
static inline void pmdp_set_wrprotect(struct mm_struct *mm, unsigned long addr, |
|
pmd_t *pmdp) |
|
{ |
|
if (__pmd_write((*pmdp))) |
|
pmd_hugepage_update(mm, addr, pmdp, _PAGE_WRITE, 0); |
|
else if (unlikely(pmd_savedwrite(*pmdp))) |
|
pmd_hugepage_update(mm, addr, pmdp, 0, _PAGE_PRIVILEGED); |
|
} |
|
|
|
/* |
|
* Only returns true for a THP. False for pmd migration entry. |
|
* We also need to return true when we come across a pte that |
|
* in between a thp split. While splitting THP, we mark the pmd |
|
* invalid (pmdp_invalidate()) before we set it with pte page |
|
* address. A pmd_trans_huge() check against a pmd entry during that time |
|
* should return true. |
|
* We should not call this on a hugetlb entry. We should check for HugeTLB |
|
* entry using vma->vm_flags |
|
* The page table walk rule is explained in Documentation/vm/transhuge.rst |
|
*/ |
|
static inline int pmd_trans_huge(pmd_t pmd) |
|
{ |
|
if (!pmd_present(pmd)) |
|
return false; |
|
|
|
if (radix_enabled()) |
|
return radix__pmd_trans_huge(pmd); |
|
return hash__pmd_trans_huge(pmd); |
|
} |
|
|
|
#define __HAVE_ARCH_PMD_SAME |
|
static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) |
|
{ |
|
if (radix_enabled()) |
|
return radix__pmd_same(pmd_a, pmd_b); |
|
return hash__pmd_same(pmd_a, pmd_b); |
|
} |
|
|
|
static inline pmd_t __pmd_mkhuge(pmd_t pmd) |
|
{ |
|
if (radix_enabled()) |
|
return radix__pmd_mkhuge(pmd); |
|
return hash__pmd_mkhuge(pmd); |
|
} |
|
|
|
/* |
|
* pfn_pmd return a pmd_t that can be used as pmd pte entry. |
|
*/ |
|
static inline pmd_t pmd_mkhuge(pmd_t pmd) |
|
{ |
|
#ifdef CONFIG_DEBUG_VM |
|
if (radix_enabled()) |
|
WARN_ON((pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE)) == 0); |
|
else |
|
WARN_ON((pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE | H_PAGE_THP_HUGE)) != |
|
cpu_to_be64(_PAGE_PTE | H_PAGE_THP_HUGE)); |
|
#endif |
|
return pmd; |
|
} |
|
|
|
#define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS |
|
extern int pmdp_set_access_flags(struct vm_area_struct *vma, |
|
unsigned long address, pmd_t *pmdp, |
|
pmd_t entry, int dirty); |
|
|
|
#define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG |
|
extern int pmdp_test_and_clear_young(struct vm_area_struct *vma, |
|
unsigned long address, pmd_t *pmdp); |
|
|
|
#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR |
|
static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, |
|
unsigned long addr, pmd_t *pmdp) |
|
{ |
|
if (radix_enabled()) |
|
return radix__pmdp_huge_get_and_clear(mm, addr, pmdp); |
|
return hash__pmdp_huge_get_and_clear(mm, addr, pmdp); |
|
} |
|
|
|
static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, |
|
unsigned long address, pmd_t *pmdp) |
|
{ |
|
if (radix_enabled()) |
|
return radix__pmdp_collapse_flush(vma, address, pmdp); |
|
return hash__pmdp_collapse_flush(vma, address, pmdp); |
|
} |
|
#define pmdp_collapse_flush pmdp_collapse_flush |
|
|
|
#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL |
|
pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma, |
|
unsigned long addr, |
|
pmd_t *pmdp, int full); |
|
|
|
#define __HAVE_ARCH_PGTABLE_DEPOSIT |
|
static inline void pgtable_trans_huge_deposit(struct mm_struct *mm, |
|
pmd_t *pmdp, pgtable_t pgtable) |
|
{ |
|
if (radix_enabled()) |
|
return radix__pgtable_trans_huge_deposit(mm, pmdp, pgtable); |
|
return hash__pgtable_trans_huge_deposit(mm, pmdp, pgtable); |
|
} |
|
|
|
#define __HAVE_ARCH_PGTABLE_WITHDRAW |
|
static inline pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, |
|
pmd_t *pmdp) |
|
{ |
|
if (radix_enabled()) |
|
return radix__pgtable_trans_huge_withdraw(mm, pmdp); |
|
return hash__pgtable_trans_huge_withdraw(mm, pmdp); |
|
} |
|
|
|
#define __HAVE_ARCH_PMDP_INVALIDATE |
|
extern pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, |
|
pmd_t *pmdp); |
|
|
|
#define pmd_move_must_withdraw pmd_move_must_withdraw |
|
struct spinlock; |
|
extern int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl, |
|
struct spinlock *old_pmd_ptl, |
|
struct vm_area_struct *vma); |
|
/* |
|
* Hash translation mode use the deposited table to store hash pte |
|
* slot information. |
|
*/ |
|
#define arch_needs_pgtable_deposit arch_needs_pgtable_deposit |
|
static inline bool arch_needs_pgtable_deposit(void) |
|
{ |
|
if (radix_enabled()) |
|
return false; |
|
return true; |
|
} |
|
extern void serialize_against_pte_lookup(struct mm_struct *mm); |
|
|
|
|
|
static inline pmd_t pmd_mkdevmap(pmd_t pmd) |
|
{ |
|
if (radix_enabled()) |
|
return radix__pmd_mkdevmap(pmd); |
|
return hash__pmd_mkdevmap(pmd); |
|
} |
|
|
|
static inline int pmd_devmap(pmd_t pmd) |
|
{ |
|
return pte_devmap(pmd_pte(pmd)); |
|
} |
|
|
|
static inline int pud_devmap(pud_t pud) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int pgd_devmap(pgd_t pgd) |
|
{ |
|
return 0; |
|
} |
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
|
|
static inline int pud_pfn(pud_t pud) |
|
{ |
|
/* |
|
* Currently all calls to pud_pfn() are gated around a pud_devmap() |
|
* check so this should never be used. If it grows another user we |
|
* want to know about it. |
|
*/ |
|
BUILD_BUG(); |
|
return 0; |
|
} |
|
#define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION |
|
pte_t ptep_modify_prot_start(struct vm_area_struct *, unsigned long, pte_t *); |
|
void ptep_modify_prot_commit(struct vm_area_struct *, unsigned long, |
|
pte_t *, pte_t, pte_t); |
|
|
|
/* |
|
* Returns true for a R -> RW upgrade of pte |
|
*/ |
|
static inline bool is_pte_rw_upgrade(unsigned long old_val, unsigned long new_val) |
|
{ |
|
if (!(old_val & _PAGE_READ)) |
|
return false; |
|
|
|
if ((!(old_val & _PAGE_WRITE)) && (new_val & _PAGE_WRITE)) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
/* |
|
* Like pmd_huge() and pmd_large(), but works regardless of config options |
|
*/ |
|
#define pmd_is_leaf pmd_is_leaf |
|
#define pmd_leaf pmd_is_leaf |
|
static inline bool pmd_is_leaf(pmd_t pmd) |
|
{ |
|
return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE)); |
|
} |
|
|
|
#define pud_is_leaf pud_is_leaf |
|
#define pud_leaf pud_is_leaf |
|
static inline bool pud_is_leaf(pud_t pud) |
|
{ |
|
return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE)); |
|
} |
|
|
|
#define p4d_is_leaf p4d_is_leaf |
|
#define p4d_leaf p4d_is_leaf |
|
static inline bool p4d_is_leaf(p4d_t p4d) |
|
{ |
|
return !!(p4d_raw(p4d) & cpu_to_be64(_PAGE_PTE)); |
|
} |
|
|
|
#endif /* __ASSEMBLY__ */ |
|
#endif /* _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ */
|
|
|