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author | Arnd Bergmann <arnd@arndb.de> | 2011-12-27 23:45:51 +0100 |
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committer | Arnd Bergmann <arnd@arndb.de> | 2011-12-27 23:45:51 +0100 |
commit | e5570bbc9c06634cfac94e06ac1432b53d8595e5 (patch) | |
tree | bfaf6b5ddedaa03d31400b25b25cfaa3bd0c9107 /arch/arm/mm/context.c | |
parent | Linux 3.2-rc4 (diff) | |
parent | arm/tegra: Compile tegra_dt_init_irq only when CONFIG_OF (diff) | |
download | linux-e5570bbc9c06634cfac94e06ac1432b53d8595e5.tar.xz linux-e5570bbc9c06634cfac94e06ac1432b53d8595e5.zip |
Merge branch 'for-3.3/soc' of git://git.kernel.org/pub/scm/linux/kernel/git/olof/tegra into tegra/soc
Diffstat (limited to 'arch/arm/mm/context.c')
-rw-r--r-- | arch/arm/mm/context.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c index 93aac068da94..ee9bb363d606 100644 --- a/arch/arm/mm/context.c +++ b/arch/arm/mm/context.c @@ -22,6 +22,21 @@ unsigned int cpu_last_asid = ASID_FIRST_VERSION; DEFINE_PER_CPU(struct mm_struct *, current_mm); #endif +#ifdef CONFIG_ARM_LPAE +#define cpu_set_asid(asid) { \ + unsigned long ttbl, ttbh; \ + asm volatile( \ + " mrrc p15, 0, %0, %1, c2 @ read TTBR0\n" \ + " mov %1, %2, lsl #(48 - 32) @ set ASID\n" \ + " mcrr p15, 0, %0, %1, c2 @ set TTBR0\n" \ + : "=&r" (ttbl), "=&r" (ttbh) \ + : "r" (asid & ~ASID_MASK)); \ +} +#else +#define cpu_set_asid(asid) \ + asm(" mcr p15, 0, %0, c13, c0, 1\n" : : "r" (asid)) +#endif + /* * We fork()ed a process, and we need a new context for the child * to run in. We reserve version 0 for initial tasks so we will @@ -37,7 +52,7 @@ void __init_new_context(struct task_struct *tsk, struct mm_struct *mm) static void flush_context(void) { /* set the reserved ASID before flushing the TLB */ - asm("mcr p15, 0, %0, c13, c0, 1\n" : : "r" (0)); + cpu_set_asid(0); isb(); local_flush_tlb_all(); if (icache_is_vivt_asid_tagged()) { @@ -99,7 +114,7 @@ static void reset_context(void *info) set_mm_context(mm, asid); /* set the new ASID */ - asm("mcr p15, 0, %0, c13, c0, 1\n" : : "r" (mm->context.id)); + cpu_set_asid(mm->context.id); isb(); } |