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| author |   Paul Mundt <lethal@linux-sh.org> | 2006-09-27 16:01:12 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2006-09-27 16:01:12 +0900 |
| commit | f1517494407b1f1ca0063a756cc30d75e96d433c (patch) | |
| tree | fe7827210e76750687de601e6b0695a4e4e16fa7 /include/asm-sh/thread_info.h | |
| parent | sh: Add support for R7780RP and R7780MP boards. (diff) | |
| download | linux-dev-f1517494407b1f1ca0063a756cc30d75e96d433c.tar.xz linux-dev-f1517494407b1f1ca0063a756cc30d75e96d433c.zip | |
sh: Cleanup and document register bank usage.
Initial register bank cleanup. Make SR.RB configurable, and add some
preliminary documentation on register bank usage within the kernel.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'include/asm-sh/thread_info.h')
| -rw-r--r-- | include/asm-sh/thread_info.h | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/include/asm-sh/thread_info.h b/include/asm-sh/thread_info.h index 7345350d98c0..f64dd803a014 100644 --- a/include/asm-sh/thread_info.h +++ b/include/asm-sh/thread_info.h @@ -48,16 +48,29 @@ struct thread_info { #define init_thread_info (init_thread_union.thread_info) #define init_stack (init_thread_union.stack) +#define THREAD_SIZE (2*PAGE_SIZE) + /* how to get the thread information struct from C */ static inline struct thread_info *current_thread_info(void) { struct thread_info *ti; +#ifdef CONFIG_CPU_HAS_SR_RB __asm__("stc r7_bank, %0" : "=r" (ti)); +#else + unsigned long __dummy; + + __asm__ __volatile__ ( + "mov r15, %0\n\t" + "and %1, %0\n\t" + : "=&r" (ti), "=r" (__dummy) + : "1" (~(THREAD_SIZE - 1)) + : "memory"); +#endif + return ti; } /* thread information allocation */ -#define THREAD_SIZE (2*PAGE_SIZE) #define alloc_thread_info(ti) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1)) #define free_thread_info(ti) free_pages((unsigned long) (ti), 1) @@ -65,7 +78,7 @@ static inline struct thread_info *current_thread_info(void) /* how to get the thread information struct from ASM */ #define GET_THREAD_INFO(reg) \ - stc r7_bank, reg + stc r7_bank, reg #endif |