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sh: Cleanup and document register bank usage.

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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>
This commit is contained in:
Paul Mundt 2006-09-27 16:01:12 +09:00
parent 5283ecb5cc
commit f151749440
3 changed files with 64 additions and 3 deletions
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17
include/asm-sh/system.h
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@ -136,7 +136,8 @@ extern void __xchg_called_with_bad_pointer(void);
#define set_mb(var, value) do { xchg(&var, value); } while (0)
/* Interrupt Control */
static __inline__ void local_irq_enable(void)
#ifdef CONFIG_CPU_HAS_SR_RB
static inline void local_irq_enable(void)
{
unsigned long __dummy0, __dummy1;
@ -149,6 +150,20 @@ static __inline__ void local_irq_enable(void)
: "1" (~0x000000f0)
: "memory");
}
#else
static inline void local_irq_enable(void)
{
unsigned long __dummy0, __dummy1;
__asm__ __volatile__ (
"stc sr, %0\n\t"
"and %1, %0\n\t"
"ldc %0, sr\n\t"
: "=&r" (__dummy0), "=r" (__dummy1)
: "1" (~0x000000f0)
: "memory");
}
#endif
static __inline__ void local_irq_disable(void)
{