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| author | Catalin Marinas <catalin.marinas@arm.com> | 2009-05-30 14:00:16 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2009-05-30 14:00:16 +0100 |
| commit | 23d1c515d8fc6d74bea442a4b687c3b5b8627ec4 (patch) | |
| tree | d257dedacef94e47006d7daca00e698296e9fa38 /arch | |
| parent | 213fb2a8ee81ec106b9b370a07ccad575e9d3748 (diff) | |
| download | lwn-23d1c515d8fc6d74bea442a4b687c3b5b8627ec4.tar.gz lwn-23d1c515d8fc6d74bea442a4b687c3b5b8627ec4.zip | |
ARMv7: Document the PRRR and NMRR registers setting
This patch adds a comment to the proc-v7.S file for the setting of the
PRRR and NMRR registers. It also sets the PRRR[13:12] bits to 0
(corresponding to the reserved TEX[0]CB encoding 110) to be consistent
with the documentation.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mm/proc-v7.S | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index 095b69f5a833..0a8ffd3c03fd 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -219,8 +219,36 @@ __v7_setup: mov r10, #0x1f @ domains 0, 1 = manager mcr p15, 0, r10, c3, c0, 0 @ load domain access register #endif - ldr r5, =0xff0aa1a8 - ldr r6, =0x40e040e0 + /* + * Memory region attributes with SCTLR.TRE=1 + * + * n = TEX[0],C,B + * TR = PRRR[2n+1:2n] - memory type + * IR = NMRR[2n+1:2n] - inner cacheable property + * OR = NMRR[2n+17:2n+16] - outer cacheable property + * + * n TR IR OR + * UNCACHED 000 00 + * BUFFERABLE 001 10 00 00 + * WRITETHROUGH 010 10 10 10 + * WRITEBACK 011 10 11 11 + * reserved 110 + * WRITEALLOC 111 10 01 01 + * DEV_SHARED 100 01 + * DEV_NONSHARED 100 01 + * DEV_WC 001 10 + * DEV_CACHED 011 10 + * + * Other attributes: + * + * DS0 = PRRR[16] = 0 - device shareable property + * DS1 = PRRR[17] = 1 - device shareable property + * NS0 = PRRR[18] = 0 - normal shareable property + * NS1 = PRRR[19] = 1 - normal shareable property + * NOS = PRRR[24+n] = 1 - not outer shareable + */ + ldr r5, =0xff0a81a8 @ PRRR + ldr r6, =0x40e040e0 @ NMRR mcr p15, 0, r5, c10, c2, 0 @ write PRRR mcr p15, 0, r6, c10, c2, 1 @ write NMRR adr r5, v7_crval |