forked from Minki/linux
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>
343 lines
9.3 KiB
C
343 lines
9.3 KiB
C
#ifndef _ASM_M32R_SYSTEM_H
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#define _ASM_M32R_SYSTEM_H
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 Hiroyuki Kondo, Hirokazu Takata, and Hitoshi Yamamoto
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* Copyright (C) 2004, 2006 Hirokazu Takata <takata at linux-m32r.org>
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*/
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#include <asm/assembler.h>
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#ifdef __KERNEL__
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/*
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* switch_to(prev, next) should switch from task `prev' to `next'
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* `prev' will never be the same as `next'.
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*
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* `next' and `prev' should be struct task_struct, but it isn't always defined
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*/
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#define switch_to(prev, next, last) do { \
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__asm__ __volatile__ ( \
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" seth lr, #high(1f) \n" \
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" or3 lr, lr, #low(1f) \n" \
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" st lr, @%4 ; store old LR \n" \
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" ld lr, @%5 ; load new LR \n" \
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" st sp, @%2 ; store old SP \n" \
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" ld sp, @%3 ; load new SP \n" \
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" push %1 ; store `prev' on new stack \n" \
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" jmp lr \n" \
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" .fillinsn \n" \
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"1: \n" \
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" pop %0 ; restore `__last' from new stack \n" \
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: "=r" (last) \
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: "0" (prev), \
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"r" (&(prev->thread.sp)), "r" (&(next->thread.sp)), \
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"r" (&(prev->thread.lr)), "r" (&(next->thread.lr)) \
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: "memory", "lr" \
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); \
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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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/* Interrupt Control */
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#if !defined(CONFIG_CHIP_M32102) && !defined(CONFIG_CHIP_M32104)
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#define local_irq_enable() \
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__asm__ __volatile__ ("setpsw #0x40 -> nop": : :"memory")
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#define local_irq_disable() \
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__asm__ __volatile__ ("clrpsw #0x40 -> nop": : :"memory")
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#else /* CONFIG_CHIP_M32102 || CONFIG_CHIP_M32104 */
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static inline void local_irq_enable(void)
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{
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unsigned long tmpreg;
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__asm__ __volatile__(
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"mvfc %0, psw; \n\t"
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"or3 %0, %0, #0x0040; \n\t"
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"mvtc %0, psw; \n\t"
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: "=&r" (tmpreg) : : "cbit", "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 tmpreg0, tmpreg1;
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__asm__ __volatile__(
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"ld24 %0, #0 ; Use 32-bit insn. \n\t"
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"mvfc %1, psw ; No interrupt can be accepted here. \n\t"
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"mvtc %0, psw \n\t"
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"and3 %0, %1, #0xffbf \n\t"
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"mvtc %0, psw \n\t"
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: "=&r" (tmpreg0), "=&r" (tmpreg1) : : "cbit", "memory");
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}
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#endif /* CONFIG_CHIP_M32102 || CONFIG_CHIP_M32104 */
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#define local_save_flags(x) \
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__asm__ __volatile__("mvfc %0,psw" : "=r"(x) : /* no input */)
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#define local_irq_restore(x) \
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__asm__ __volatile__("mvtc %0,psw" : /* no outputs */ \
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: "r" (x) : "cbit", "memory")
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#if !(defined(CONFIG_CHIP_M32102) || defined(CONFIG_CHIP_M32104))
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#define local_irq_save(x) \
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__asm__ __volatile__( \
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"mvfc %0, psw; \n\t" \
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"clrpsw #0x40 -> nop; \n\t" \
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: "=r" (x) : /* no input */ : "memory")
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#else /* CONFIG_CHIP_M32102 || CONFIG_CHIP_M32104 */
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#define local_irq_save(x) \
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({ \
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unsigned long tmpreg; \
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__asm__ __volatile__( \
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"ld24 %1, #0 \n\t" \
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"mvfc %0, psw \n\t" \
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"mvtc %1, psw \n\t" \
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"and3 %1, %0, #0xffbf \n\t" \
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"mvtc %1, psw \n\t" \
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: "=r" (x), "=&r" (tmpreg) \
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: : "cbit", "memory"); \
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})
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#endif /* CONFIG_CHIP_M32102 || CONFIG_CHIP_M32104 */
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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 & 0x40); \
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})
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#define nop() __asm__ __volatile__ ("nop" : : )
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#define xchg(ptr,x) \
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((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
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#define tas(ptr) (xchg((ptr),1))
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#ifdef CONFIG_SMP
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extern void __xchg_called_with_bad_pointer(void);
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#endif
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#ifdef CONFIG_CHIP_M32700_TS1
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#define DCACHE_CLEAR(reg0, reg1, addr) \
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"seth "reg1", #high(dcache_dummy); \n\t" \
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"or3 "reg1", "reg1", #low(dcache_dummy); \n\t" \
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"lock "reg0", @"reg1"; \n\t" \
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"add3 "reg0", "addr", #0x1000; \n\t" \
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"ld "reg0", @"reg0"; \n\t" \
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"add3 "reg0", "addr", #0x2000; \n\t" \
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"ld "reg0", @"reg0"; \n\t" \
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"unlock "reg0", @"reg1"; \n\t"
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/* FIXME: This workaround code cannot handle kenrel modules
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* correctly under SMP environment.
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*/
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#else /* CONFIG_CHIP_M32700_TS1 */
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#define DCACHE_CLEAR(reg0, reg1, addr)
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#endif /* CONFIG_CHIP_M32700_TS1 */
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static inline unsigned long
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__xchg(unsigned long x, volatile void * ptr, int size)
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{
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unsigned long flags;
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unsigned long tmp = 0;
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local_irq_save(flags);
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switch (size) {
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#ifndef CONFIG_SMP
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case 1:
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__asm__ __volatile__ (
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"ldb %0, @%2 \n\t"
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"stb %1, @%2 \n\t"
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: "=&r" (tmp) : "r" (x), "r" (ptr) : "memory");
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break;
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case 2:
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__asm__ __volatile__ (
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"ldh %0, @%2 \n\t"
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"sth %1, @%2 \n\t"
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: "=&r" (tmp) : "r" (x), "r" (ptr) : "memory");
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break;
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case 4:
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__asm__ __volatile__ (
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"ld %0, @%2 \n\t"
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"st %1, @%2 \n\t"
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: "=&r" (tmp) : "r" (x), "r" (ptr) : "memory");
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break;
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#else /* CONFIG_SMP */
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case 4:
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__asm__ __volatile__ (
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DCACHE_CLEAR("%0", "r4", "%2")
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"lock %0, @%2; \n\t"
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"unlock %1, @%2; \n\t"
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: "=&r" (tmp) : "r" (x), "r" (ptr)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r4"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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break;
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default:
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__xchg_called_with_bad_pointer();
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#endif /* CONFIG_SMP */
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}
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local_irq_restore(flags);
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return (tmp);
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}
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#define __HAVE_ARCH_CMPXCHG 1
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static inline unsigned long
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__cmpxchg_u32(volatile unsigned int *p, unsigned int old, unsigned int new)
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{
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unsigned long flags;
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unsigned int retval;
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local_irq_save(flags);
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__asm__ __volatile__ (
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DCACHE_CLEAR("%0", "r4", "%1")
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M32R_LOCK" %0, @%1; \n"
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" bne %0, %2, 1f; \n"
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M32R_UNLOCK" %3, @%1; \n"
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" bra 2f; \n"
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" .fillinsn \n"
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"1:"
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M32R_UNLOCK" %0, @%1; \n"
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" .fillinsn \n"
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"2:"
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: "=&r" (retval)
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: "r" (p), "r" (old), "r" (new)
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: "cbit", "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r4"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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return retval;
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}
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/* This function doesn't exist, so you'll get a linker error
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if something tries to do an invalid cmpxchg(). */
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extern void __cmpxchg_called_with_bad_pointer(void);
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static inline unsigned long
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__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
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{
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switch (size) {
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case 4:
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return __cmpxchg_u32(ptr, old, new);
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#if 0 /* we don't have __cmpxchg_u64 */
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case 8:
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return __cmpxchg_u64(ptr, old, new);
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#endif /* 0 */
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}
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__cmpxchg_called_with_bad_pointer();
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return old;
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}
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#define cmpxchg(ptr,o,n) \
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({ \
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__typeof__(*(ptr)) _o_ = (o); \
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__typeof__(*(ptr)) _n_ = (n); \
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(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
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(unsigned long)_n_, sizeof(*(ptr))); \
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})
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#endif /* __KERNEL__ */
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/*
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* Memory barrier.
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*
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* mb() prevents loads and stores being reordered across this point.
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* rmb() prevents loads being reordered across this point.
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* wmb() prevents stores being reordered across this point.
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*/
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#define mb() barrier()
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#define rmb() mb()
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#define wmb() mb()
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/**
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* read_barrier_depends - Flush all pending reads that subsequents reads
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* depend on.
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*
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* No data-dependent reads from memory-like regions are ever reordered
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* over this barrier. All reads preceding this primitive are guaranteed
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* to access memory (but not necessarily other CPUs' caches) before any
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* reads following this primitive that depend on the data return by
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* any of the preceding reads. This primitive is much lighter weight than
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* rmb() on most CPUs, and is never heavier weight than is
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* rmb().
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*
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* These ordering constraints are respected by both the local CPU
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* and the compiler.
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*
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* Ordering is not guaranteed by anything other than these primitives,
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* not even by data dependencies. See the documentation for
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* memory_barrier() for examples and URLs to more information.
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*
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* For example, the following code would force ordering (the initial
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* value of "a" is zero, "b" is one, and "p" is "&a"):
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*
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* <programlisting>
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* CPU 0 CPU 1
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*
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* b = 2;
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* memory_barrier();
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* p = &b; q = p;
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* read_barrier_depends();
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* d = *q;
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* </programlisting>
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*
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*
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* because the read of "*q" depends on the read of "p" and these
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* two reads are separated by a read_barrier_depends(). However,
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* the following code, with the same initial values for "a" and "b":
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*
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* <programlisting>
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* CPU 0 CPU 1
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*
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* a = 2;
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* memory_barrier();
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* b = 3; y = b;
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* read_barrier_depends();
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* x = a;
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* </programlisting>
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*
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* does not enforce ordering, since there is no data dependency between
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* the read of "a" and the read of "b". Therefore, on some CPUs, such
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* as Alpha, "y" could be set to 3 and "x" to 0. Use rmb()
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* in cases like this where there are no data dependencies.
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**/
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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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#define arch_align_stack(x) (x)
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#endif /* _ASM_M32R_SYSTEM_H */
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