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ARM: 6942/1: mm: make TTBR1 always point to swapper_pg_dir on ARMv6/7

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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>
This commit is contained in:
Catalin Marinas 2011-05-26 11:22:44 +01:00 committed by Russell King
parent a248b13b21
commit d427958a46
5 changed files with 13 additions and 4 deletions
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1
arch/arm/include/asm/smp.h
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@ -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;

7
arch/arm/kernel/head.S
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@ -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

1
arch/arm/kernel/smp.c
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@ -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));

4
arch/arm/mm/proc-v6.S
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@ -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}

4
arch/arm/mm/proc-v7.S
View File

@ -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