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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-09-06 23:04:59 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-10-01 19:40:56 +0400 |
| commit | bb30f36f9b71c31dc8fe3483bba4c9884fc86080 (patch) | |
| tree | c99b583586ebec2a29be2b0173d1eb9ad07a68f9 /arch/arm/include/asm/pgtable.h | |
| parent | 9cff96e5bfc8e366166bfb07610604c7604ac48c (diff) | |
| download | linux-bb30f36f9b71c31dc8fe3483bba4c9884fc86080.tar.xz | |
[ARM] Introduce new PTE memory type bits
Provide L_PTE_MT_xxx definitions to describe the memory types that we
use in Linux/ARM. These definitions are carefully picked such that:
1. their LSBs match what is required for pre-ARMv6 CPUs.
2. they all have a unique encoding, including after modification
by build_mem_type_table() (the result being that some have more
than one combination.)
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/pgtable.h')
| -rw-r--r-- | arch/arm/include/asm/pgtable.h | 33 |
1 files changed, 28 insertions, 5 deletions
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 5c75e02b3c7c..8df2e254a3e4 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -164,14 +164,35 @@ extern void __pgd_error(const char *file, int line, unsigned long val); #define L_PTE_PRESENT (1 << 0) #define L_PTE_FILE (1 << 1) /* only when !PRESENT */ #define L_PTE_YOUNG (1 << 1) -#define L_PTE_BUFFERABLE (1 << 2) /* matches PTE */ -#define L_PTE_CACHEABLE (1 << 3) /* matches PTE */ +#define L_PTE_BUFFERABLE (1 << 2) /* obsolete, matches PTE */ +#define L_PTE_CACHEABLE (1 << 3) /* obsolete, matches PTE */ #define L_PTE_DIRTY (1 << 6) #define L_PTE_WRITE (1 << 7) #define L_PTE_USER (1 << 8) #define L_PTE_EXEC (1 << 9) #define L_PTE_SHARED (1 << 10) /* shared(v6), coherent(xsc3) */ +/* + * These are the memory types, defined to be compatible with + * pre-ARMv6 CPUs cacheable and bufferable bits: XXCB + * (note: build_mem_type_table modifies these bits + * to work with our existing proc-*.S setup.) + */ +#define L_PTE_MT_UNCACHED (0x00 << 2) /* 0000 */ +#define L_PTE_MT_BUFFERABLE (0x01 << 2) /* 0001 */ +#define L_PTE_MT_WRITETHROUGH (0x02 << 2) /* 0010 */ +#define L_PTE_MT_WRITEBACK (0x03 << 2) /* 0011 */ +#define L_PTE_MT_MINICACHE (0x06 << 2) /* 0110 (sa1100, xscale) */ +#define L_PTE_MT_WRITEALLOC (0x07 << 2) /* 0111 */ +#define L_PTE_MT_DEV_SHARED (0x04 << 2) /* 0100 (pre-v6) */ +#define L_PTE_MT_DEV_SHARED2 (0x05 << 2) /* 0101 (v6) */ +#define L_PTE_MT_DEV_NONSHARED (0x0c << 2) /* 1100 */ +#define L_PTE_MT_DEV_IXP2000 (0x0d << 2) /* 1101 */ +#define L_PTE_MT_DEV_WC (0x09 << 2) /* 1001 (pre-v6, !xsc3) */ +#define L_PTE_MT_DEV_WC2 (0x08 << 2) /* 1000 (xsc3, v6) */ +#define L_PTE_MT_DEV_CACHED (0x0b << 2) /* 1011 */ +#define L_PTE_MT_MASK (0x0f << 2) + #ifndef __ASSEMBLY__ /* @@ -180,7 +201,7 @@ extern void __pgd_error(const char *file, int line, unsigned long val); * as well as any architecture dependent bits like global/ASID and SMP * shared mapping bits. */ -#define _L_PTE_DEFAULT L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_CACHEABLE | L_PTE_BUFFERABLE +#define _L_PTE_DEFAULT L_PTE_PRESENT | L_PTE_YOUNG #define _L_PTE_READ L_PTE_USER | L_PTE_EXEC extern pgprot_t pgprot_user; @@ -286,8 +307,10 @@ static inline pte_t pte_mkspecial(pte_t pte) { return pte; } /* * Mark the prot value as uncacheable and unbufferable. */ -#define pgprot_noncached(prot) __pgprot(pgprot_val(prot) & ~(L_PTE_CACHEABLE | L_PTE_BUFFERABLE)) -#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~L_PTE_CACHEABLE) +#define pgprot_noncached(prot) \ + __pgprot((pgprot_val(prot) & ~L_PTE_MT_MASK) | L_PTE_MT_UNCACHED) +#define pgprot_writecombine(prot) \ + __pgprot((pgprot_val(prot) & ~L_PTE_MT_MASK) | L_PTE_MT_BUFFERABLE) #define pmd_none(pmd) (!pmd_val(pmd)) #define pmd_present(pmd) (pmd_val(pmd)) |