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| author | Deepak Saxena <dsaxena@plexity.net> | 2005-08-29 23:54:53 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-08-29 23:54:53 +0200 |
| commit | 083bc6b3c9b52b5998cc49d4aa2f8f15c2e84e6b (patch) | |
| tree | 935852aa0f2bee2d68d704d8007a2524189a3f4f /arch/arm/mm | |
| parent | [ARM] 2861/1: PXA: Add some extra pxa27x register definitions (diff) | |
| download | linux-083bc6b3c9b52b5998cc49d4aa2f8f15c2e84e6b.tar.xz linux-083bc6b3c9b52b5998cc49d4aa2f8f15c2e84e6b.zip | |
[ARM] 2853/1: Make alloc_init_supersection() work with 36-bit mappings
Patch from Deepak Saxena
Working on adding support for 36-bit static mappings for ARMv6 and
Intel's XSC3 core and noticed that alloc_init_supersection currently
increments the phys addr by 1MB on each of the 16 iterations and then
forces alignment to supersection size (16MB). This is really uneeded
b/c we have already forced the phys address to be 16MB aligned in
create_mapping(). Furthermore, this breaks 36-bit addressing b/c bits
[23:20] of the PMD contain bits [35:32] of the physical address and
the masking causes us to loose those bits thus ending up with an
incorrect virt -> phys translation. The other option is to have an
alloc_init_supersection36.
Tested on Intel IXP2350 CPU with 36-bit static I/O mappings.
Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm')
| -rw-r--r-- | arch/arm/mm/mm-armv.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/arm/mm/mm-armv.c b/arch/arm/mm/mm-armv.c index 3c655c54e231..4dae00bf7a56 100644 --- a/arch/arm/mm/mm-armv.c +++ b/arch/arm/mm/mm-armv.c @@ -275,11 +275,9 @@ alloc_init_supersection(unsigned long virt, unsigned long phys, int prot) int i; for (i = 0; i < 16; i += 1) { - alloc_init_section(virt, phys & SUPERSECTION_MASK, - prot | PMD_SECT_SUPER); + alloc_init_section(virt, phys, prot | PMD_SECT_SUPER); virt += (PGDIR_SIZE / 2); - phys += (PGDIR_SIZE / 2); } } |