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When running on armv6, set alignment checking to modulo-4 mode rather

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than modulo-8, because clang emits ldrd and strd instructions for
addresses that are only 4-byte aligned.
This commit is contained in:
Ian Lepore 2013-03-31 22:42:25 +00:00
parent ebae998767
commit 070cf887bb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=248961
1 changed files with 9 additions and 3 deletions
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12
sys/arm/arm/locore.S
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@ -176,10 +176,16 @@ Lunmapped:
/* Set the Domain Access register. Very important! */
mov r0, #((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT)
mcr p15, 0, r0, c3, c0, 0
/* Enable MMU */
/*
* Enable MMU.
* On armv6 enable extended page tables, and set alignment checking
* to modulo-4 (CPU_CONTROL_UNAL_ENABLE) for the ldrd/strd
* instructions emitted by clang.
*/
mrc p15, 0, r0, c1, c0, 0
#if defined(CPU_ARM1136) || defined(CPU_ARM1176) || defined(CPU_CORTEXA) || defined(CPU_MV_PJ4B)
orr r0, r0, #CPU_CONTROL_V6_EXTPAGE
#ifdef _ARM_ARCH_6
orr r0, r0, #(CPU_CONTROL_V6_EXTPAGE | CPU_CONTROL_UNAL_ENABLE)
orr r2, r2, #(CPU_CONTROL_AFLT_ENABLE)
#endif
orr r0, r0, #(CPU_CONTROL_MMU_ENABLE)
mcr p15, 0, r0, c1, c0, 0