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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-03-19 19:34:08 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-03-24 13:47:33 +1100
commit8d1cf34e7ad5c7738ce20d20bd7f002f562cb8b5 (patch)
treef731b8b2d3e71e7287bed977bdd7fc9ea6942d45 /arch/powerpc/mm/ppc_mmu_32.c
parent2a7d55fda58eb4e3652252d4f71222bd1ff90c5e (diff)
powerpc/mm: Tweak PTE bit combination definitions
This patch tweaks the way some PTE bit combinations are defined, in such a way that the 32 and 64-bit variant become almost identical and that will make it easier to bring in a new common pte-* file for the new variant of the Book3-E support. The combination of bits defining access to kernel pages are now clearly separated from the combination used by userspace and the core VM. The resulting generated code should remain identical unless I made a mistake. Note: While at it, I removed a non-sensical statement related to CONFIG_KGDB in ppc_mmu_32.c which could cause kernel mappings to be user accessible when that option is enabled. Probably something that bitrot. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/ppc_mmu_32.c')
-rw-r--r--arch/powerpc/mm/ppc_mmu_32.c10
1 files changed, 2 insertions, 8 deletions
diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c
index fe65c405412..2d2a87e1015 100644
--- a/arch/powerpc/mm/ppc_mmu_32.c
+++ b/arch/powerpc/mm/ppc_mmu_32.c
@@ -74,9 +74,6 @@ unsigned long p_mapped_by_bats(phys_addr_t pa)
unsigned long __init mmu_mapin_ram(void)
{
-#ifdef CONFIG_POWER4
- return 0;
-#else
unsigned long tot, bl, done;
unsigned long max_size = (256<<20);
@@ -95,7 +92,7 @@ unsigned long __init mmu_mapin_ram(void)
break;
}
- setbat(2, PAGE_OFFSET, 0, bl, _PAGE_RAM);
+ setbat(2, PAGE_OFFSET, 0, bl, PAGE_KERNEL_X);
done = (unsigned long)bat_addrs[2].limit - PAGE_OFFSET + 1;
if ((done < tot) && !bat_addrs[3].limit) {
/* use BAT3 to cover a bit more */
@@ -103,12 +100,11 @@ unsigned long __init mmu_mapin_ram(void)
for (bl = 128<<10; bl < max_size; bl <<= 1)
if (bl * 2 > tot)
break;
- setbat(3, PAGE_OFFSET+done, done, bl, _PAGE_RAM);
+ setbat(3, PAGE_OFFSET+done, done, bl, PAGE_KERNEL_X);
done = (unsigned long)bat_addrs[3].limit - PAGE_OFFSET + 1;
}
return done;
-#endif
}
/*
@@ -136,9 +132,7 @@ void __init setbat(int index, unsigned long virt, phys_addr_t phys,
wimgxpp |= (flags & _PAGE_RW)? BPP_RW: BPP_RX;
bat[1].batu = virt | (bl << 2) | 2; /* Vs=1, Vp=0 */
bat[1].batl = BAT_PHYS_ADDR(phys) | wimgxpp;
-#ifndef CONFIG_KGDB /* want user access for breakpoints */
if (flags & _PAGE_USER)
-#endif
bat[1].batu |= 1; /* Vp = 1 */
if (flags & _PAGE_GUARDED) {
/* G bit must be zero in IBATs */