mirror of
https://github.com/torvalds/linux
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52393ccc0a
set_wmb should not be used in the kernel because it just confuses the
code more and has no benefit. Since it is not currently used in the
kernel this patch removes it so that new code does not include it.
All archs define set_wmb(var, value) to do { var = value; wmb(); }
while(0) except ia64 and sparc which use a mb() instead. But this is
still moot since it is not used anyway.
Hasn't been tested on any archs but x86 and x86_64 (and only compiled
tested)
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
272 lines
6.4 KiB
C
272 lines
6.4 KiB
C
#ifndef __ASM_SH_SYSTEM_H
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#define __ASM_SH_SYSTEM_H
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/*
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* Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
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* Copyright (C) 2002 Paul Mundt
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*/
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/*
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* switch_to() should switch tasks to task nr n, first
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*/
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#define switch_to(prev, next, last) do { \
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struct task_struct *__last; \
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register unsigned long *__ts1 __asm__ ("r1") = &prev->thread.sp; \
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register unsigned long *__ts2 __asm__ ("r2") = &prev->thread.pc; \
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register unsigned long *__ts4 __asm__ ("r4") = (unsigned long *)prev; \
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register unsigned long *__ts5 __asm__ ("r5") = (unsigned long *)next; \
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register unsigned long *__ts6 __asm__ ("r6") = &next->thread.sp; \
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register unsigned long __ts7 __asm__ ("r7") = next->thread.pc; \
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__asm__ __volatile__ (".balign 4\n\t" \
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"stc.l gbr, @-r15\n\t" \
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"sts.l pr, @-r15\n\t" \
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"mov.l r8, @-r15\n\t" \
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"mov.l r9, @-r15\n\t" \
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"mov.l r10, @-r15\n\t" \
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"mov.l r11, @-r15\n\t" \
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"mov.l r12, @-r15\n\t" \
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"mov.l r13, @-r15\n\t" \
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"mov.l r14, @-r15\n\t" \
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"mov.l r15, @r1 ! save SP\n\t" \
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"mov.l @r6, r15 ! change to new stack\n\t" \
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"mova 1f, %0\n\t" \
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"mov.l %0, @r2 ! save PC\n\t" \
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"mov.l 2f, %0\n\t" \
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"jmp @%0 ! call __switch_to\n\t" \
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" lds r7, pr ! with return to new PC\n\t" \
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".balign 4\n" \
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"2:\n\t" \
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".long __switch_to\n" \
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"1:\n\t" \
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"mov.l @r15+, r14\n\t" \
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"mov.l @r15+, r13\n\t" \
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"mov.l @r15+, r12\n\t" \
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"mov.l @r15+, r11\n\t" \
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"mov.l @r15+, r10\n\t" \
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"mov.l @r15+, r9\n\t" \
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"mov.l @r15+, r8\n\t" \
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"lds.l @r15+, pr\n\t" \
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"ldc.l @r15+, gbr\n\t" \
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: "=z" (__last) \
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: "r" (__ts1), "r" (__ts2), "r" (__ts4), \
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"r" (__ts5), "r" (__ts6), "r" (__ts7) \
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: "r3", "t"); \
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last = __last; \
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} while (0)
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/*
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* On SMP systems, when the scheduler does migration-cost autodetection,
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* it needs a way to flush as much of the CPU's caches as possible.
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*
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* TODO: fill this in!
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*/
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static inline void sched_cacheflush(void)
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{
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}
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#define nop() __asm__ __volatile__ ("nop")
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#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
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static __inline__ unsigned long tas(volatile int *m)
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{ /* #define tas(ptr) (xchg((ptr),1)) */
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unsigned long retval;
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__asm__ __volatile__ ("tas.b @%1\n\t"
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"movt %0"
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: "=r" (retval): "r" (m): "t", "memory");
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return retval;
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}
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extern void __xchg_called_with_bad_pointer(void);
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#define mb() __asm__ __volatile__ ("": : :"memory")
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#define rmb() mb()
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#define wmb() __asm__ __volatile__ ("": : :"memory")
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#define read_barrier_depends() do { } while(0)
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#ifdef CONFIG_SMP
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#define smp_mb() mb()
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#define smp_rmb() rmb()
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#define smp_wmb() wmb()
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#define smp_read_barrier_depends() read_barrier_depends()
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#else
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#define smp_mb() barrier()
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#define smp_rmb() barrier()
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#define smp_wmb() barrier()
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#define smp_read_barrier_depends() do { } while(0)
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#endif
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#define set_mb(var, value) do { xchg(&var, value); } while (0)
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/* Interrupt Control */
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static __inline__ void local_irq_enable(void)
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{
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unsigned long __dummy0, __dummy1;
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__asm__ __volatile__("stc sr, %0\n\t"
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"and %1, %0\n\t"
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"stc r6_bank, %1\n\t"
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"or %1, %0\n\t"
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"ldc %0, sr"
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: "=&r" (__dummy0), "=r" (__dummy1)
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: "1" (~0x000000f0)
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: "memory");
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}
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static __inline__ void local_irq_disable(void)
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{
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unsigned long __dummy;
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__asm__ __volatile__("stc sr, %0\n\t"
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"or #0xf0, %0\n\t"
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"ldc %0, sr"
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: "=&z" (__dummy)
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: /* no inputs */
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: "memory");
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}
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#define local_save_flags(x) \
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__asm__("stc sr, %0; and #0xf0, %0" : "=&z" (x) :/**/: "memory" )
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#define irqs_disabled() \
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({ \
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unsigned long flags; \
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local_save_flags(flags); \
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(flags != 0); \
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})
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static __inline__ unsigned long local_irq_save(void)
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{
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unsigned long flags, __dummy;
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__asm__ __volatile__("stc sr, %1\n\t"
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"mov %1, %0\n\t"
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"or #0xf0, %0\n\t"
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"ldc %0, sr\n\t"
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"mov %1, %0\n\t"
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"and #0xf0, %0"
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: "=&z" (flags), "=&r" (__dummy)
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:/**/
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: "memory" );
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return flags;
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}
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#ifdef DEBUG_CLI_STI
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static __inline__ void local_irq_restore(unsigned long x)
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{
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if ((x & 0x000000f0) != 0x000000f0)
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local_irq_enable();
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else {
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unsigned long flags;
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local_save_flags(flags);
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if (flags == 0) {
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extern void dump_stack(void);
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printk(KERN_ERR "BUG!\n");
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dump_stack();
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local_irq_disable();
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}
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}
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}
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#else
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#define local_irq_restore(x) do { \
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if ((x & 0x000000f0) != 0x000000f0) \
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local_irq_enable(); \
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} while (0)
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#endif
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#define really_restore_flags(x) do { \
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if ((x & 0x000000f0) != 0x000000f0) \
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local_irq_enable(); \
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else \
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local_irq_disable(); \
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} while (0)
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/*
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* Jump to P2 area.
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* When handling TLB or caches, we need to do it from P2 area.
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*/
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#define jump_to_P2() \
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do { \
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unsigned long __dummy; \
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__asm__ __volatile__( \
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"mov.l 1f, %0\n\t" \
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"or %1, %0\n\t" \
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"jmp @%0\n\t" \
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" nop\n\t" \
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".balign 4\n" \
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"1: .long 2f\n" \
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"2:" \
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: "=&r" (__dummy) \
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: "r" (0x20000000)); \
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} while (0)
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/*
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* Back to P1 area.
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*/
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#define back_to_P1() \
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do { \
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unsigned long __dummy; \
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__asm__ __volatile__( \
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"nop;nop;nop;nop;nop;nop;nop\n\t" \
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"mov.l 1f, %0\n\t" \
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"jmp @%0\n\t" \
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" nop\n\t" \
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".balign 4\n" \
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"1: .long 2f\n" \
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"2:" \
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: "=&r" (__dummy)); \
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} while (0)
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/* For spinlocks etc */
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#define local_irq_save(x) x = local_irq_save()
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static __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
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{
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unsigned long flags, retval;
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local_irq_save(flags);
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retval = *m;
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*m = val;
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local_irq_restore(flags);
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return retval;
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}
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static __inline__ unsigned long xchg_u8(volatile unsigned char * m, unsigned long val)
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{
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unsigned long flags, retval;
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local_irq_save(flags);
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retval = *m;
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*m = val & 0xff;
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local_irq_restore(flags);
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return retval;
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}
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static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
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{
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switch (size) {
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case 4:
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return xchg_u32(ptr, x);
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break;
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case 1:
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return xchg_u8(ptr, x);
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break;
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}
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__xchg_called_with_bad_pointer();
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return x;
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}
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/* XXX
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* disable hlt during certain critical i/o operations
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*/
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#define HAVE_DISABLE_HLT
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void disable_hlt(void);
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void enable_hlt(void);
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#define arch_align_stack(x) (x)
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#endif
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