tree 935852aa0f2bee2d68d704d8007a2524189a3f4f
parent 3e88a579d05e1bb6c51d88f0936e372895edb8ff
author Deepak Saxena <[EMAIL PROTECTED]> Mon, 29 Aug 2005 22:54:53 +0100
committer Russell King <[EMAIL PROTECTED]> Mon, 29 Aug 2005 22:54:53 +0100

[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
Tested on Intel IXP2350 CPU with 36-bit static I/O mappings.

Signed-off-by: Deepak Saxena <[EMAIL PROTECTED]>
Signed-off-by: Russell King <[EMAIL PROTECTED]>

 arch/arm/mm/mm-armv.c |    4 +---
 1 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/arm/mm/mm-armv.c b/arch/arm/mm/mm-armv.c
--- a/arch/arm/mm/mm-armv.c
+++ b/arch/arm/mm/mm-armv.c
@@ -275,11 +275,9 @@ alloc_init_supersection(unsigned long vi
        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);
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