mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45 lines
1.8 KiB
45 lines
1.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef _ASM_POWERPC_BOOK3S_32_HASH_H |
|
#define _ASM_POWERPC_BOOK3S_32_HASH_H |
|
#ifdef __KERNEL__ |
|
|
|
/* |
|
* The "classic" 32-bit implementation of the PowerPC MMU uses a hash |
|
* table containing PTEs, together with a set of 16 segment registers, |
|
* to define the virtual to physical address mapping. |
|
* |
|
* We use the hash table as an extended TLB, i.e. a cache of currently |
|
* active mappings. We maintain a two-level page table tree, much |
|
* like that used by the i386, for the sake of the Linux memory |
|
* management code. Low-level assembler code in hash_low_32.S |
|
* (procedure hash_page) is responsible for extracting ptes from the |
|
* tree and putting them into the hash table when necessary, and |
|
* updating the accessed and modified bits in the page table tree. |
|
*/ |
|
|
|
#define _PAGE_PRESENT 0x001 /* software: pte contains a translation */ |
|
#define _PAGE_HASHPTE 0x002 /* hash_page has made an HPTE for this pte */ |
|
#define _PAGE_USER 0x004 /* usermode access allowed */ |
|
#define _PAGE_GUARDED 0x008 /* G: prohibit speculative access */ |
|
#define _PAGE_COHERENT 0x010 /* M: enforce memory coherence (SMP systems) */ |
|
#define _PAGE_NO_CACHE 0x020 /* I: cache inhibit */ |
|
#define _PAGE_WRITETHRU 0x040 /* W: cache write-through */ |
|
#define _PAGE_DIRTY 0x080 /* C: page changed */ |
|
#define _PAGE_ACCESSED 0x100 /* R: page referenced */ |
|
#define _PAGE_EXEC 0x200 /* software: exec allowed */ |
|
#define _PAGE_RW 0x400 /* software: user write access allowed */ |
|
#define _PAGE_SPECIAL 0x800 /* software: Special page */ |
|
|
|
#ifdef CONFIG_PTE_64BIT |
|
/* We never clear the high word of the pte */ |
|
#define _PTE_NONE_MASK (0xffffffff00000000ULL | _PAGE_HASHPTE) |
|
#else |
|
#define _PTE_NONE_MASK _PAGE_HASHPTE |
|
#endif |
|
|
|
#define _PMD_PRESENT 0 |
|
#define _PMD_PRESENT_MASK (PAGE_MASK) |
|
#define _PMD_BAD (~PAGE_MASK) |
|
|
|
#endif /* __KERNEL__ */ |
|
#endif /* _ASM_POWERPC_BOOK3S_32_HASH_H */
|
|
|