diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mm/context.c | 11 | ||||
| -rw-r--r-- | arch/arm/mm/proc-v7.S | 10 |
2 files changed, 10 insertions, 11 deletions
diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c index b0ee9ba3cfab..0d86298c7279 100644 --- a/arch/arm/mm/context.c +++ b/arch/arm/mm/context.c @@ -24,9 +24,7 @@ DEFINE_PER_CPU(struct mm_struct *, current_mm); /* * 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 - * always allocate an ASID. The ASID 0 is reserved for the TTBR - * register changing sequence. + * to run in. */ void __init_new_context(struct task_struct *tsk, struct mm_struct *mm) { @@ -36,8 +34,11 @@ 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)); + u32 ttb; + /* Copy TTBR1 into TTBR0 */ + asm volatile("mrc p15, 0, %0, c2, c0, 1\n" + "mcr p15, 0, %0, c2, c0, 0" + : "=r" (ttb)); isb(); local_flush_tlb_all(); if (icache_is_vivt_asid_tagged()) { diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index 3c3867850a30..b3b566ec83d3 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -108,18 +108,16 @@ ENTRY(cpu_v7_switch_mm) #ifdef CONFIG_ARM_ERRATA_430973 mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB #endif -#ifdef CONFIG_ARM_ERRATA_754322 - dsb -#endif - mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID - isb -1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 + mrc p15, 0, r2, c2, c0, 1 @ load TTB 1 + mcr p15, 0, r2, c2, c0, 0 @ into TTB 0 isb #ifdef CONFIG_ARM_ERRATA_754322 dsb #endif mcr p15, 0, r1, c13, c0, 1 @ set context ID isb + mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 + isb #endif mov pc, lr ENDPROC(cpu_v7_switch_mm) |