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/*
* linux/include/asm-arm/proc-armo/processor.h
*
* Copyright (c) 1996 Russell King.
*
* Changelog:
* 27-06-1996 RMK Created
* 10-10-1996 RMK Brought up to date with SA110
* 26-09-1996 RMK Added 'EXTRA_THREAD_STRUCT*'
* 28-09-1996 RMK Moved start_thread into the processor dependencies
* 11-01-1998 RMK Added new uaccess_t
*/
#ifndef __ASM_PROC_PROCESSOR_H
#define __ASM_PROC_PROCESSOR_H
#ifdef __KERNEL__
#include <asm/assembler.h>
#include <linux/string.h>
#define KERNEL_STACK_SIZE 4096
/*
* on arm2,3 wp does not work
*/
#define wp_works_ok 0
#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
struct context_save_struct {
unsigned long r4;
unsigned long r5;
unsigned long r6;
unsigned long r7;
unsigned long r8;
unsigned long r9;
unsigned long fp;
unsigned long pc;
};
typedef struct {
void (*put_byte)(void); /* Special calling convention */
void (*get_byte)(void); /* Special calling convention */
void (*put_half)(void); /* Special calling convention */
void (*get_half)(void); /* Special calling convention */
void (*put_word)(void); /* Special calling convention */
void (*get_word)(void); /* Special calling convention */
unsigned long (*copy_from_user)(void *to, const void *from, unsigned long sz);
unsigned long (*copy_to_user)(void *to, const void *from, unsigned long sz);
unsigned long (*clear_user)(void *addr, unsigned long sz);
unsigned long (*strncpy_from_user)(char *to, const char *from, unsigned long sz);
unsigned long (*strlen_user)(const char *s);
} uaccess_t;
extern uaccess_t uaccess_user, uaccess_kernel;
#define EXTRA_THREAD_STRUCT \
uaccess_t *uaccess; /* User access functions*/ \
struct context_save_struct *save; \
unsigned long memmap; \
unsigned long memcmap[256];
#define EXTRA_THREAD_STRUCT_INIT \
&uaccess_kernel, \
0, \
(unsigned long) swapper_pg_dir, \
{ 0, }
DECLARE_THREAD_STRUCT;
/*
* Return saved PC of a blocked thread.
*/
extern __inline__ unsigned long thread_saved_pc (struct thread_struct *t)
{
if (t->save)
return t->save->pc & ~PCMASK;
else
return 0;
}
extern __inline__ unsigned long get_css_fp (struct thread_struct *t)
{
if (t->save)
return t->save->fp;
else
return 0;
}
asmlinkage void ret_from_sys_call(void) __asm__("ret_from_sys_call");
extern __inline__ void copy_thread_css (struct context_save_struct *save)
{
save->r4 =
save->r5 =
save->r6 =
save->r7 =
save->r8 =
save->r9 =
save->fp = 0;
save->pc = ((unsigned long)ret_from_sys_call) | SVC26_MODE;
}
#define start_thread(regs,pc,sp) \
({ \
unsigned long *stack = (unsigned long *)sp; \
set_fs(USER_DS); \
memzero(regs->uregs, sizeof (regs->uregs)); \
regs->ARM_pc = pc; /* pc */ \
regs->ARM_sp = sp; /* sp */ \
regs->ARM_r2 = stack[2]; /* r2 (envp) */ \
regs->ARM_r1 = stack[1]; /* r1 (argv) */ \
regs->ARM_r0 = stack[0]; /* r0 (argc) */ \
flush_tlb_mm(current->mm); \
})
/* Allocation and freeing of basic task resources. */
/*
* NOTE! The task struct and the stack go together
*/
#define alloc_task_struct() \
((struct task_struct *) __get_free_pages(GFP_KERNEL,1))
#define free_task_struct(p) free_pages((unsigned long)(p),1)
#endif
#endif
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