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/*

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

 *

 * Copyright (c) 1996 Russell King.

 *

 * Changelog:

 *  20-09-1996  RMK     Created

 *  26-09-1996  RMK     Added 'EXTRA_THREAD_STRUCT*'

 *  28-09-1996  RMK     Moved start_thread into the processor dependencies

 */

#ifndef __ASM_PROC_PROCESSOR_H

#define __ASM_PROC_PROCESSOR_H

#ifdef __KERNEL__

#define KERNEL_STACK_SIZE       PAGE_SIZE

#define alloc_kernel_stack()    __get_free_page(GFP_KERNEL)

#define free_kernel_stack(page) free_page((page))

/*

 * 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 cpsr;

        unsigned long r4;

        unsigned long r5;

        unsigned long r6;

        unsigned long r7;

        unsigned long r8;

        unsigned long r9;

        unsigned long r10;

        unsigned long fp;

        unsigned long pc;

};

#ifndef NO_MM

#define EXTRA_THREAD_STRUCT                             \

        struct context_save_struct *save;               \

        unsigned long memmap;

#define EXTRA_THREAD_STRUCT_INIT                        \

        0,                                               \

        ((unsigned long) swapper_pg_dir) - PAGE_OFFSET

#else

#define EXTRA_THREAD_STRUCT     \

                struct context_save_struct *save;

#define EXTRA_THREAD_STRUCT_INIT                        \

#endif

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;

        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->cpsr = SVC_MODE;

        save->r4 =

        save->r5 =

        save->r6 =

        save->r7 =

        save->r8 =

        save->r9 =

        save->r10 =

        save->fp = 0;

        save->pc = (unsigned long) ret_from_sys_call;

}

#define start_thread(regs,pc,sp)                                        \

({                                                                      \

        unsigned long *stack = (unsigned long *)sp;                     \

        set_fs(USER_DS);                                                \

        memzero(regs->uregs, sizeof(regs->uregs));                      \

        if (current->personality == PER_LINUX_32BIT)                    \

                regs->ARM_cpsr = USR_MODE;                              \

        else                                                            \

                regs->ARM_cpsr = USR26_MODE;                            \

        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) */                 \

})

#endif

#endif