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200 lines
6.0 KiB
200 lines
6.0 KiB
/* |
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* fixmap.h: compile-time virtual memory allocation |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1998 Ingo Molnar |
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* |
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* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 |
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* x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009 |
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*/ |
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#ifndef _ASM_X86_FIXMAP_H |
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#define _ASM_X86_FIXMAP_H |
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#include <asm/kmap_size.h> |
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/* |
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* Exposed to assembly code for setting up initial page tables. Cannot be |
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* calculated in assembly code (fixmap entries are an enum), but is sanity |
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* checked in the actual fixmap C code to make sure that the fixmap is |
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* covered fully. |
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*/ |
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#ifndef CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP |
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# define FIXMAP_PMD_NUM 2 |
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#else |
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# define KM_PMDS (KM_MAX_IDX * ((CONFIG_NR_CPUS + 511) / 512)) |
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# define FIXMAP_PMD_NUM (KM_PMDS + 2) |
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#endif |
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/* fixmap starts downwards from the 507th entry in level2_fixmap_pgt */ |
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#define FIXMAP_PMD_TOP 507 |
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#ifndef __ASSEMBLY__ |
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#include <linux/kernel.h> |
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#include <asm/apicdef.h> |
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#include <asm/page.h> |
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#include <asm/pgtable_types.h> |
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#ifdef CONFIG_X86_32 |
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#include <linux/threads.h> |
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#else |
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#include <uapi/asm/vsyscall.h> |
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#endif |
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/* |
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* We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall |
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* uses fixmaps that relies on FIXADDR_TOP for proper address calculation. |
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* Because of this, FIXADDR_TOP x86 integration was left as later work. |
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*/ |
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#ifdef CONFIG_X86_32 |
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/* |
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* Leave one empty page between vmalloc'ed areas and |
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* the start of the fixmap. |
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*/ |
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extern unsigned long __FIXADDR_TOP; |
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#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) |
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#else |
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#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \ |
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PAGE_SIZE) |
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#endif |
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/* |
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* Here we define all the compile-time 'special' virtual |
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* addresses. The point is to have a constant address at |
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* compile time, but to set the physical address only |
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* in the boot process. |
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* for x86_32: We allocate these special addresses |
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* from the end of virtual memory (0xfffff000) backwards. |
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* Also this lets us do fail-safe vmalloc(), we |
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* can guarantee that these special addresses and |
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* vmalloc()-ed addresses never overlap. |
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* |
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* These 'compile-time allocated' memory buffers are |
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* fixed-size 4k pages (or larger if used with an increment |
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* higher than 1). Use set_fixmap(idx,phys) to associate |
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* physical memory with fixmap indices. |
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* |
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* TLB entries of such buffers will not be flushed across |
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* task switches. |
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*/ |
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enum fixed_addresses { |
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#ifdef CONFIG_X86_32 |
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FIX_HOLE, |
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#else |
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#ifdef CONFIG_X86_VSYSCALL_EMULATION |
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VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, |
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#endif |
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#endif |
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FIX_DBGP_BASE, |
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FIX_EARLYCON_MEM_BASE, |
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#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
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FIX_OHCI1394_BASE, |
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#endif |
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#ifdef CONFIG_X86_LOCAL_APIC |
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FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ |
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#endif |
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#ifdef CONFIG_X86_IO_APIC |
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FIX_IO_APIC_BASE_0, |
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FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, |
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#endif |
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#ifdef CONFIG_KMAP_LOCAL |
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FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ |
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FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1, |
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#ifdef CONFIG_PCI_MMCONFIG |
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FIX_PCIE_MCFG, |
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#endif |
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#endif |
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#ifdef CONFIG_PARAVIRT_XXL |
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FIX_PARAVIRT_BOOTMAP, |
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#endif |
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#ifdef CONFIG_ACPI_APEI_GHES |
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/* Used for GHES mapping from assorted contexts */ |
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FIX_APEI_GHES_IRQ, |
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FIX_APEI_GHES_NMI, |
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#endif |
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__end_of_permanent_fixed_addresses, |
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/* |
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* 512 temporary boot-time mappings, used by early_ioremap(), |
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* before ioremap() is functional. |
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* |
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* If necessary we round it up to the next 512 pages boundary so |
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* that we can have a single pmd entry and a single pte table: |
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*/ |
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#define NR_FIX_BTMAPS 64 |
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#define FIX_BTMAPS_SLOTS 8 |
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#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) |
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FIX_BTMAP_END = |
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(__end_of_permanent_fixed_addresses ^ |
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(__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) & |
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-PTRS_PER_PTE |
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? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - |
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(__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1)) |
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: __end_of_permanent_fixed_addresses, |
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FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, |
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#ifdef CONFIG_X86_32 |
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FIX_WP_TEST, |
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#endif |
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#ifdef CONFIG_INTEL_TXT |
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FIX_TBOOT_BASE, |
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#endif |
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__end_of_fixed_addresses |
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}; |
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extern void reserve_top_address(unsigned long reserve); |
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#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) |
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#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
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#define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) |
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#define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE) |
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extern int fixmaps_set; |
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extern pte_t *pkmap_page_table; |
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void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); |
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void native_set_fixmap(unsigned /* enum fixed_addresses */ idx, |
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phys_addr_t phys, pgprot_t flags); |
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#ifndef CONFIG_PARAVIRT_XXL |
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static inline void __set_fixmap(enum fixed_addresses idx, |
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phys_addr_t phys, pgprot_t flags) |
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{ |
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native_set_fixmap(idx, phys, flags); |
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} |
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#endif |
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/* |
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* FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not |
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* supported for MMIO addresses, so make sure that the memory encryption |
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* mask is not part of the page attributes. |
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*/ |
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#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE |
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/* |
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* Early memremap routines used for in-place encryption. The mappings created |
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* by these routines are intended to be used as temporary mappings. |
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*/ |
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void __init *early_memremap_encrypted(resource_size_t phys_addr, |
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unsigned long size); |
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void __init *early_memremap_encrypted_wp(resource_size_t phys_addr, |
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unsigned long size); |
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void __init *early_memremap_decrypted(resource_size_t phys_addr, |
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unsigned long size); |
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void __init *early_memremap_decrypted_wp(resource_size_t phys_addr, |
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unsigned long size); |
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#include <asm-generic/fixmap.h> |
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#define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags) |
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#define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0)) |
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void __early_set_fixmap(enum fixed_addresses idx, |
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phys_addr_t phys, pgprot_t flags); |
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#endif /* !__ASSEMBLY__ */ |
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#endif /* _ASM_X86_FIXMAP_H */
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