forked from luck/tmp_suning_uos_patched
f6dc8c5b8e
During the recent discussion of taking 'volatile' off of the spinlock, I noticed that while most arches #define cpu_relax() such that it implies barrier(), some arches define cpu_relax() to be empty. This patch changes the definition of cpu_relax() for frv, h8300, m68knommu, sh, sh64, v850 and xtensa from an empty while(0) to the compiler barrier(). Signed-off-by: Chase Venters <chase.venters@clientec.com> Acked-by: Arjan van de Ven <arjan@Linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
154 lines
4.0 KiB
C
154 lines
4.0 KiB
C
/* processor.h: FRV processor definitions
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*
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* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_PROCESSOR_H
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#define _ASM_PROCESSOR_H
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#include <asm/mem-layout.h>
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#ifndef __ASSEMBLY__
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#define current_text_addr() ({ __label__ _l; _l: &&_l;})
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#include <linux/compiler.h>
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#include <linux/linkage.h>
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#include <asm/sections.h>
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#include <asm/segment.h>
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#include <asm/fpu.h>
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#include <asm/registers.h>
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#include <asm/ptrace.h>
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#include <asm/current.h>
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#include <asm/cache.h>
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/* Forward declaration, a strange C thing */
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struct task_struct;
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/*
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* CPU type and hardware bug flags. Kept separately for each CPU.
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*/
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struct cpuinfo_frv {
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#ifdef CONFIG_MMU
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unsigned long *pgd_quick;
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unsigned long *pte_quick;
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unsigned long pgtable_cache_sz;
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#endif
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} __cacheline_aligned;
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extern struct cpuinfo_frv __nongprelbss boot_cpu_data;
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#define cpu_data (&boot_cpu_data)
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#define current_cpu_data boot_cpu_data
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/*
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* Bus types
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*/
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#define EISA_bus 0
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#define MCA_bus 0
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struct thread_struct {
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struct pt_regs *frame; /* [GR28] exception frame ptr for this thread */
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struct task_struct *curr; /* [GR29] current pointer for this thread */
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unsigned long sp; /* [GR1 ] kernel stack pointer */
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unsigned long fp; /* [GR2 ] kernel frame pointer */
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unsigned long lr; /* link register */
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unsigned long pc; /* program counter */
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unsigned long gr[12]; /* [GR16-GR27] */
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unsigned long sched_lr; /* LR from schedule() */
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union {
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struct pt_regs *frame0; /* top (user) stack frame */
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struct user_context *user; /* userspace context */
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};
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} __attribute__((aligned(8)));
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extern struct pt_regs *__kernel_frame0_ptr;
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extern struct task_struct *__kernel_current_task;
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#endif
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#ifndef __ASSEMBLY__
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#define INIT_THREAD_FRAME0 \
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((struct pt_regs *) \
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(sizeof(init_stack) + (unsigned long) init_stack - sizeof(struct user_context)))
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#define INIT_THREAD { \
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NULL, \
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(struct task_struct *) init_stack, \
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0, 0, 0, 0, \
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \
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0, \
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{ INIT_THREAD_FRAME0 }, \
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}
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/*
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* do necessary setup to start up a newly executed thread.
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* - need to discard the frame stacked by init() invoking the execve syscall
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*/
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#define start_thread(_regs, _pc, _usp) \
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do { \
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set_fs(USER_DS); /* reads from user space */ \
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__frame = __kernel_frame0_ptr; \
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__frame->pc = (_pc); \
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__frame->psr &= ~PSR_S; \
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__frame->sp = (_usp); \
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} while(0)
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extern void prepare_to_copy(struct task_struct *tsk);
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/* Free all resources held by a thread. */
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static inline void release_thread(struct task_struct *dead_task)
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{
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}
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extern asmlinkage int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
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extern asmlinkage void save_user_regs(struct user_context *target);
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extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);
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#define copy_segments(tsk, mm) do { } while (0)
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#define release_segments(mm) do { } while (0)
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#define forget_segments() do { } while (0)
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/*
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* Free current thread data structures etc..
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*/
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static inline void exit_thread(void)
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{
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}
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/*
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* Return saved PC of a blocked thread.
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*/
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extern unsigned long thread_saved_pc(struct task_struct *tsk);
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unsigned long get_wchan(struct task_struct *p);
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#define KSTK_EIP(tsk) ((tsk)->thread.frame0->pc)
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#define KSTK_ESP(tsk) ((tsk)->thread.frame0->sp)
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/* Allocation and freeing of basic task resources. */
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extern struct task_struct *alloc_task_struct(void);
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extern void free_task_struct(struct task_struct *p);
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#define cpu_relax() barrier()
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/* data cache prefetch */
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#define ARCH_HAS_PREFETCH
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static inline void prefetch(const void *x)
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{
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asm volatile("dcpl %0,gr0,#0" : : "r"(x));
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}
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_PROCESSOR_H */
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