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>
144 lines
3.5 KiB
C
144 lines
3.5 KiB
C
/*
|
|
* include/asm-m68k/processor.h
|
|
*
|
|
* Copyright (C) 1995 Hamish Macdonald
|
|
*/
|
|
|
|
#ifndef __ASM_M68K_PROCESSOR_H
|
|
#define __ASM_M68K_PROCESSOR_H
|
|
|
|
/*
|
|
* Default implementation of macro that returns current
|
|
* instruction pointer ("program counter").
|
|
*/
|
|
#define current_text_addr() ({ __label__ _l; _l: &&_l;})
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/threads.h>
|
|
#include <asm/types.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/fpu.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/current.h>
|
|
|
|
static inline unsigned long rdusp(void)
|
|
{
|
|
#ifdef CONFIG_COLDFIRE
|
|
extern unsigned int sw_usp;
|
|
return(sw_usp);
|
|
#else
|
|
unsigned long usp;
|
|
__asm__ __volatile__("move %/usp,%0" : "=a" (usp));
|
|
return usp;
|
|
#endif
|
|
}
|
|
|
|
static inline void wrusp(unsigned long usp)
|
|
{
|
|
#ifdef CONFIG_COLDFIRE
|
|
extern unsigned int sw_usp;
|
|
sw_usp = usp;
|
|
#else
|
|
__asm__ __volatile__("move %0,%/usp" : : "a" (usp));
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* User space process size: 3.75GB. This is hardcoded into a few places,
|
|
* so don't change it unless you know what you are doing.
|
|
*/
|
|
#define TASK_SIZE (0xF0000000UL)
|
|
|
|
/*
|
|
* This decides where the kernel will search for a free chunk of vm
|
|
* space during mmap's. We won't be using it
|
|
*/
|
|
#define TASK_UNMAPPED_BASE 0
|
|
|
|
/*
|
|
* if you change this structure, you must change the code and offsets
|
|
* in m68k/machasm.S
|
|
*/
|
|
|
|
struct thread_struct {
|
|
unsigned long ksp; /* kernel stack pointer */
|
|
unsigned long usp; /* user stack pointer */
|
|
unsigned short sr; /* saved status register */
|
|
unsigned short fs; /* saved fs (sfc, dfc) */
|
|
unsigned long crp[2]; /* cpu root pointer */
|
|
unsigned long esp0; /* points to SR of stack frame */
|
|
unsigned long fp[8*3];
|
|
unsigned long fpcntl[3]; /* fp control regs */
|
|
unsigned char fpstate[FPSTATESIZE]; /* floating point state */
|
|
};
|
|
|
|
#define INIT_THREAD { \
|
|
sizeof(init_stack) + (unsigned long) init_stack, 0, \
|
|
PS_S, __KERNEL_DS, \
|
|
{0, 0}, 0, {0,}, {0, 0, 0}, {0,}, \
|
|
}
|
|
|
|
/*
|
|
* Coldfire stacks need to be re-aligned on trap exit, conventional
|
|
* 68k can handle this case cleanly.
|
|
*/
|
|
#if defined(CONFIG_COLDFIRE)
|
|
#define reformat(_regs) do { (_regs)->format = 0x4; } while(0)
|
|
#else
|
|
#define reformat(_regs) do { } while (0)
|
|
#endif
|
|
|
|
/*
|
|
* Do necessary setup to start up a newly executed thread.
|
|
*
|
|
* pass the data segment into user programs if it exists,
|
|
* it can't hurt anything as far as I can tell
|
|
*/
|
|
#define start_thread(_regs, _pc, _usp) \
|
|
do { \
|
|
set_fs(USER_DS); /* reads from user space */ \
|
|
(_regs)->pc = (_pc); \
|
|
((struct switch_stack *)(_regs))[-1].a6 = 0; \
|
|
reformat(_regs); \
|
|
if (current->mm) \
|
|
(_regs)->d5 = current->mm->start_data; \
|
|
(_regs)->sr &= ~0x2000; \
|
|
wrusp(_usp); \
|
|
} while(0)
|
|
|
|
/* Forward declaration, a strange C thing */
|
|
struct task_struct;
|
|
|
|
/* Free all resources held by a thread. */
|
|
static inline void release_thread(struct task_struct *dead_task)
|
|
{
|
|
}
|
|
|
|
/* Prepare to copy thread state - unlazy all lazy status */
|
|
#define prepare_to_copy(tsk) do { } while (0)
|
|
|
|
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
|
|
|
|
/*
|
|
* Free current thread data structures etc..
|
|
*/
|
|
static inline void exit_thread(void)
|
|
{
|
|
}
|
|
|
|
unsigned long thread_saved_pc(struct task_struct *tsk);
|
|
unsigned long get_wchan(struct task_struct *p);
|
|
|
|
#define KSTK_EIP(tsk) \
|
|
({ \
|
|
unsigned long eip = 0; \
|
|
if ((tsk)->thread.esp0 > PAGE_SIZE && \
|
|
(virt_addr_valid((tsk)->thread.esp0))) \
|
|
eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
|
|
eip; })
|
|
#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
|
|
|
|
#define cpu_relax() barrier()
|
|
|
|
#endif
|