mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 17:24:17 +08:00
148c69b4b0
Make cpu_relax() invoke barrier() to be the same as other arches. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
187 lines
4.5 KiB
C
187 lines
4.5 KiB
C
/* MN10300 Processor specifics
|
|
*
|
|
* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _ASM_PROCESSOR_H
|
|
#define _ASM_PROCESSOR_H
|
|
|
|
#include <asm/page.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/cpu-regs.h>
|
|
#include <linux/threads.h>
|
|
|
|
/* Forward declaration, a strange C thing */
|
|
struct task_struct;
|
|
struct mm_struct;
|
|
|
|
/*
|
|
* Default implementation of macro that returns current
|
|
* instruction pointer ("program counter").
|
|
*/
|
|
#define current_text_addr() \
|
|
({ \
|
|
void *__pc; \
|
|
asm("mov pc,%0" : "=a"(__pc)); \
|
|
__pc; \
|
|
})
|
|
|
|
extern void show_registers(struct pt_regs *regs);
|
|
|
|
/*
|
|
* CPU type and hardware bug flags. Kept separately for each CPU.
|
|
* Members of this structure are referenced in head.S, so think twice
|
|
* before touching them. [mj]
|
|
*/
|
|
|
|
struct mn10300_cpuinfo {
|
|
int type;
|
|
unsigned long loops_per_sec;
|
|
char hard_math;
|
|
unsigned long *pgd_quick;
|
|
unsigned long *pte_quick;
|
|
unsigned long pgtable_cache_sz;
|
|
};
|
|
|
|
extern struct mn10300_cpuinfo boot_cpu_data;
|
|
|
|
#define cpu_data &boot_cpu_data
|
|
#define current_cpu_data boot_cpu_data
|
|
|
|
extern void identify_cpu(struct mn10300_cpuinfo *);
|
|
extern void print_cpu_info(struct mn10300_cpuinfo *);
|
|
extern void dodgy_tsc(void);
|
|
#define cpu_relax() barrier()
|
|
|
|
/*
|
|
* User space process size: 1.75GB (default).
|
|
*/
|
|
#define TASK_SIZE 0x70000000
|
|
|
|
/*
|
|
* Where to put the userspace stack by default
|
|
*/
|
|
#define STACK_TOP 0x70000000
|
|
#define STACK_TOP_MAX STACK_TOP
|
|
|
|
/* This decides where the kernel will search for a free chunk of vm
|
|
* space during mmap's.
|
|
*/
|
|
#define TASK_UNMAPPED_BASE 0x30000000
|
|
|
|
typedef struct {
|
|
unsigned long seg;
|
|
} mm_segment_t;
|
|
|
|
struct fpu_state_struct {
|
|
unsigned long fs[32]; /* fpu registers */
|
|
unsigned long fpcr; /* fpu control register */
|
|
};
|
|
|
|
struct thread_struct {
|
|
struct pt_regs *uregs; /* userspace register frame */
|
|
unsigned long pc; /* kernel PC */
|
|
unsigned long sp; /* kernel SP */
|
|
unsigned long a3; /* kernel FP */
|
|
unsigned long wchan;
|
|
unsigned long usp;
|
|
struct pt_regs *__frame;
|
|
unsigned long fpu_flags;
|
|
#define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */
|
|
struct fpu_state_struct fpu_state;
|
|
};
|
|
|
|
#define INIT_THREAD \
|
|
{ \
|
|
.uregs = init_uregs, \
|
|
.pc = 0, \
|
|
.sp = 0, \
|
|
.a3 = 0, \
|
|
.wchan = 0, \
|
|
.__frame = NULL, \
|
|
}
|
|
|
|
#define INIT_MMAP \
|
|
{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
|
|
NULL, NULL }
|
|
|
|
/*
|
|
* do necessary setup to start up a newly executed thread
|
|
* - need to discard the frame stacked by the kernel thread invoking the execve
|
|
* syscall (see RESTORE_ALL macro)
|
|
*/
|
|
#define start_thread(regs, new_pc, new_sp) do { \
|
|
set_fs(USER_DS); \
|
|
__frame = current->thread.uregs; \
|
|
__frame->epsw = EPSW_nSL | EPSW_IE | EPSW_IM; \
|
|
__frame->pc = new_pc; \
|
|
__frame->sp = new_sp; \
|
|
} while (0)
|
|
|
|
/* Free all resources held by a thread. */
|
|
extern void release_thread(struct task_struct *);
|
|
|
|
/* Prepare to copy thread state - unlazy all lazy status */
|
|
extern void prepare_to_copy(struct task_struct *tsk);
|
|
|
|
/*
|
|
* create a kernel thread without removing it from tasklists
|
|
*/
|
|
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
|
|
|
|
/*
|
|
* Return saved PC of a blocked thread.
|
|
*/
|
|
extern unsigned long thread_saved_pc(struct task_struct *tsk);
|
|
|
|
unsigned long get_wchan(struct task_struct *p);
|
|
|
|
#define task_pt_regs(task) \
|
|
({ \
|
|
struct pt_regs *__regs__; \
|
|
__regs__ = (struct pt_regs *) (KSTK_TOP(task_stack_page(task)) - 8); \
|
|
__regs__ - 1; \
|
|
})
|
|
|
|
#define KSTK_EIP(task) (task_pt_regs(task)->pc)
|
|
#define KSTK_ESP(task) (task_pt_regs(task)->sp)
|
|
|
|
#define KSTK_TOP(info) \
|
|
({ \
|
|
(unsigned long)(info) + THREAD_SIZE; \
|
|
})
|
|
|
|
#define ARCH_HAS_PREFETCH
|
|
#define ARCH_HAS_PREFETCHW
|
|
|
|
static inline void prefetch(const void *x)
|
|
{
|
|
#ifndef CONFIG_MN10300_CACHE_DISABLED
|
|
#ifdef CONFIG_MN10300_PROC_MN103E010
|
|
asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
|
|
#else
|
|
asm volatile ("dcpf (%0)" : : "r"(x));
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
static inline void prefetchw(const void *x)
|
|
{
|
|
#ifndef CONFIG_MN10300_CACHE_DISABLED
|
|
#ifdef CONFIG_MN10300_PROC_MN103E010
|
|
asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
|
|
#else
|
|
asm volatile ("dcpf (%0)" : : "r"(x));
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
#endif /* _ASM_PROCESSOR_H */
|