diff options
| author | Xin Xie <xxie@nvidia.com> | 2011-04-12 19:37:55 -0700 |
|---|---|---|
| committer | Niket Sirsi <nsirsi@nvidia.com> | 2011-05-25 15:56:47 -0700 |
| commit | 13d6b6cf06caba33ade36f132c603e721affcfaf (patch) | |
| tree | 528e2674a5a34ee8ac62ed5dab2ca2aa42c5ef24 /arch/arm/kernel | |
| parent | e2a716d266285140c765cf12c8c820cfcfa8442b (diff) | |
ARM: mm: domain switch removal
This patch has 2 purposes:
* Disable CPU prefetching ioremap'ed memory
* Keep Copy-On-Write policy for some CPU instructions emulation in
kernel space(i.e. SWP)
This is the backport of the upstream Linux kernel:
* ARM: 6384/1: Remove the domain switching on ARMv6k/v7 CPUs
(main kernel commit ID: 247055aa21ffef1c49dd64710d5e94c2aee19b58)
Change-Id: Ic467be916282278e104192401b5289d283317f1a
Reviewed-on: http://git-master/r/29734
Reviewed-by: Niket Sirsi <nsirsi@nvidia.com>
Tested-by: Niket Sirsi <nsirsi@nvidia.com>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 4 | ||||
| -rw-r--r-- | arch/arm/kernel/fiq.c | 5 | ||||
| -rw-r--r-- | arch/arm/kernel/traps.c | 14 |
3 files changed, 17 insertions, 6 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 0db42186a769..71a645a24a5f 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -733,7 +733,7 @@ ENTRY(__switch_to) THUMB( stmia ip!, {r4 - sl, fp} ) @ Store most regs on stack THUMB( str sp, [ip], #4 ) THUMB( str lr, [ip], #4 ) -#ifdef CONFIG_MMU +#ifdef CONFIG_CPU_USE_DOMAINS ldr r6, [r2, #TI_CPU_DOMAIN] #endif set_tls r3, r4, r5 @@ -742,7 +742,7 @@ ENTRY(__switch_to) ldr r8, =__stack_chk_guard ldr r7, [r7, #TSK_STACK_CANARY] #endif -#ifdef CONFIG_MMU +#ifdef CONFIG_CPU_USE_DOMAINS mcr p15, 0, r6, c3, c0, 0 @ Set domain register #endif mov r5, r0 diff --git a/arch/arm/kernel/fiq.c b/arch/arm/kernel/fiq.c index 6ff7919613d7..d601ef297eb6 100644 --- a/arch/arm/kernel/fiq.c +++ b/arch/arm/kernel/fiq.c @@ -45,6 +45,7 @@ #include <asm/fiq.h> #include <asm/irq.h> #include <asm/system.h> +#include <asm/traps.h> static unsigned long no_fiq_insn; @@ -77,7 +78,11 @@ int show_fiq_list(struct seq_file *p, void *v) void set_fiq_handler(void *start, unsigned int length) { +#if defined(CONFIG_CPU_USE_DOMAINS) memcpy((void *)0xffff001c, start, length); +#else + memcpy(vectors_page + 0x1c, start, length); +#endif flush_icache_range(0xffff001c, 0xffff001c + length); if (!vectors_high()) flush_icache_range(0x1c, 0x1c + length); diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 752699701565..555c3d23ce21 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -37,6 +37,8 @@ static const char *handler[]= { "prefetch abort", "data abort", "address exception", "interrupt" }; +void *vectors_page; + #ifdef CONFIG_DEBUG_USER unsigned int user_debug; @@ -761,7 +763,11 @@ static void __init kuser_get_tls_init(unsigned long vectors) void __init early_trap_init(void) { +#if defined(CONFIG_CPU_USE_DOMAINS) unsigned long vectors = CONFIG_VECTORS_BASE; +#else + unsigned long vectors = (unsigned long)vectors_page; +#endif extern char __stubs_start[], __stubs_end[]; extern char __vectors_start[], __vectors_end[]; extern char __kuser_helper_start[], __kuser_helper_end[]; @@ -785,10 +791,10 @@ void __init early_trap_init(void) * Copy signal return handlers into the vector page, and * set sigreturn to be a pointer to these. */ - memcpy((void *)KERN_SIGRETURN_CODE, sigreturn_codes, - sizeof(sigreturn_codes)); - memcpy((void *)KERN_RESTART_CODE, syscall_restart_code, - sizeof(syscall_restart_code)); + memcpy((void *)(vectors + KERN_SIGRETURN_CODE - CONFIG_VECTORS_BASE), + sigreturn_codes, sizeof(sigreturn_codes)); + memcpy((void *)(vectors + KERN_RESTART_CODE - CONFIG_VECTORS_BASE), + syscall_restart_code, sizeof(syscall_restart_code)); flush_icache_range(vectors, vectors + PAGE_SIZE); modify_domain(DOMAIN_USER, DOMAIN_CLIENT); |