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ARM: LPAE: Add context switching support

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With LPAE, TTBRx registers are 64-bit. The ASID is stored in TTBR0
rather than a separate Context ID register. This patch makes the
necessary changes to handle context switching on LPAE.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas 2011-11-22 17:30:31 +00:00
parent f7b8156d15
commit 14d8c9512a
1 changed files with 17 additions and 2 deletions
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19
arch/arm/mm/context.c
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@ -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();
}