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| author | Catalin Marinas <catalin.marinas@arm.com> | 2011-05-26 11:22:44 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-05-26 12:14:32 +0100 |
| commit | d427958a46af24f75d0017c45eadd172273bbf33 (patch) | |
| tree | e4279d383e7eaccdfe22420abe0a68a35bcc4c85 | |
| parent | a248b13b21ae00b97638b4f435c8df3075808b5d (diff) | |
| download | blackbird-op-linux-d427958a46af24f75d0017c45eadd172273bbf33.tar.gz blackbird-op-linux-d427958a46af24f75d0017c45eadd172273bbf33.zip | |
ARM: 6942/1: mm: make TTBR1 always point to swapper_pg_dir on ARMv6/7
This patch makes TTBR1 point to swapper_pg_dir so that global, kernel
mappings can be used exclusively on v6 and v7 cores where they are
needed.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/include/asm/smp.h | 1 | ||||
| -rw-r--r-- | arch/arm/kernel/head.S | 7 | ||||
| -rw-r--r-- | arch/arm/kernel/smp.c | 1 | ||||
| -rw-r--r-- | arch/arm/mm/proc-v6.S | 4 | ||||
| -rw-r--r-- | arch/arm/mm/proc-v7.S | 4 |
5 files changed, 13 insertions, 4 deletions
diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h index d2b514fd76f4..e42d96a45d3e 100644 --- a/arch/arm/include/asm/smp.h +++ b/arch/arm/include/asm/smp.h @@ -70,6 +70,7 @@ extern void platform_smp_prepare_cpus(unsigned int); */ struct secondary_data { unsigned long pgdir; + unsigned long swapper_pg_dir; void *stack; }; extern struct secondary_data secondary_data; diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index c9173cfbbc74..8224b1d5f2f2 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -113,6 +113,7 @@ ENTRY(stext) ldr r13, =__mmap_switched @ address to jump to after @ mmu has been enabled adr lr, BSYM(1f) @ return (PIC) address + mov r8, r4 @ set TTBR1 to swapper_pg_dir ARM( add pc, r10, #PROCINFO_INITFUNC ) THUMB( add r12, r10, #PROCINFO_INITFUNC ) THUMB( mov pc, r12 ) @@ -302,8 +303,10 @@ ENTRY(secondary_startup) */ adr r4, __secondary_data ldmia r4, {r5, r7, r12} @ address to jump to after - sub r4, r4, r5 @ mmu has been enabled - ldr r4, [r7, r4] @ get secondary_data.pgdir + sub lr, r4, r5 @ mmu has been enabled + ldr r4, [r7, lr] @ get secondary_data.pgdir + add r7, r7, #4 + ldr r8, [r7, lr] @ get secondary_data.swapper_pg_dir adr lr, BSYM(__enable_mmu) @ return address mov r13, r12 @ __secondary_switched address ARM( add pc, r10, #PROCINFO_INITFUNC ) @ initialise processor diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index d439a8f4c078..344e52b16c8c 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -105,6 +105,7 @@ int __cpuinit __cpu_up(unsigned int cpu) */ secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; secondary_data.pgdir = virt_to_phys(pgd); + secondary_data.swapper_pg_dir = virt_to_phys(swapper_pg_dir); __cpuc_flush_dcache_area(&secondary_data, sizeof(secondary_data)); outer_clean_range(__pa(&secondary_data), __pa(&secondary_data + 1)); diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S index ab17cc0d3fa7..1d2b8451bf25 100644 --- a/arch/arm/mm/proc-v6.S +++ b/arch/arm/mm/proc-v6.S @@ -213,7 +213,9 @@ __v6_setup: mcr p15, 0, r0, c2, c0, 2 @ TTB control register ALT_SMP(orr r4, r4, #TTB_FLAGS_SMP) ALT_UP(orr r4, r4, #TTB_FLAGS_UP) - mcr p15, 0, r4, c2, c0, 1 @ load TTB1 + ALT_SMP(orr r8, r8, #TTB_FLAGS_SMP) + ALT_UP(orr r8, r8, #TTB_FLAGS_UP) + mcr p15, 0, r8, c2, c0, 1 @ load TTB1 #endif /* CONFIG_MMU */ adr r5, v6_crval ldmia r5, {r5, r6} diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index babfba09c89f..3c3867850a30 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -368,7 +368,9 @@ __v7_setup: mcr p15, 0, r10, c2, c0, 2 @ TTB control register ALT_SMP(orr r4, r4, #TTB_FLAGS_SMP) ALT_UP(orr r4, r4, #TTB_FLAGS_UP) - mcr p15, 0, r4, c2, c0, 1 @ load TTB1 + ALT_SMP(orr r8, r8, #TTB_FLAGS_SMP) + ALT_UP(orr r8, r8, #TTB_FLAGS_UP) + mcr p15, 0, r8, c2, c0, 1 @ load TTB1 ldr r5, =PRRR @ PRRR ldr r6, =NMRR @ NMRR mcr p15, 0, r5, c10, c2, 0 @ write PRRR |
