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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 /arch/arm/kernel | |
| parent | a248b13b21ae00b97638b4f435c8df3075808b5d (diff) | |
| download | linux-d427958a46af24f75d0017c45eadd172273bbf33.tar.gz linux-d427958a46af24f75d0017c45eadd172273bbf33.tar.bz2 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>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/head.S | 7 | ||||
| -rw-r--r-- | arch/arm/kernel/smp.c | 1 |
2 files changed, 6 insertions, 2 deletions
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)); |