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[ARM] 2853/1: Make alloc_init_supersection() work with 36-bit mappings

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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>
This commit is contained in:
Deepak Saxena 2005-08-29 22:54:53 +01:00 committed by Russell King
parent 3e88a579d0
commit 083bc6b3c9
1 changed files with 1 additions and 3 deletions
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4
arch/arm/mm/mm-armv.c
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@ -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);
}
}