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/*

 *  linux/include/asm-arm/proc-armo/processor.h

 *

 *  Copyright (C) 1996 Russell King.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 *  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

 *   09-09-1998 PJB     Delete redundant `wp_works_ok'

 *   30-05-1999 PJB     Save sl across context switches

 */

#ifndef __ASM_PROC_PROCESSOR_H

#define __ASM_PROC_PROCESSOR_H

#include <linux/string.h>

#define KERNEL_STACK_SIZE 4096

struct context_save_struct {

        unsigned long r4;

        unsigned long r5;

        unsigned long r6;

        unsigned long r7;

        unsigned long r8;

        unsigned long r9;

        unsigned long sl;

        unsigned long fp;

        unsigned long pc;

};

#define INIT_CSS (struct context_save_struct){ 0, 0, 0, 0, 0, 0, 0, 0, SVC26_MODE }

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 (*strnlen_user)(const char *s, long n);

} uaccess_t;

extern uaccess_t uaccess_user, uaccess_kernel;

#define EXTRA_THREAD_STRUCT                                                     \

        uaccess_t       *uaccess;               /* User access functions*/

#define EXTRA_THREAD_STRUCT_INIT                \

        .uaccess        = &uaccess_kernel,

#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) */                 \

})

#define KSTK_EIP(tsk)   (((unsigned long *)(4096+(unsigned long)(tsk)))[1020])

#define KSTK_ESP(tsk)   (((unsigned long *)(4096+(unsigned long)(tsk)))[1018])

/* Allocation and freeing of basic task resources. */

/*

 * NOTE! The task struct and the stack go together

 */

extern unsigned long get_page_8k(int priority);

extern void free_page_8k(unsigned long page);

#define ll_alloc_task_struct()  ((struct task_struct *)get_page_8k(GFP_KERNEL))

#define ll_free_task_struct(p)  free_page_8k((unsigned long)(p))

#endif