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/* $Id: processor.h,v 1.1.1.1 2001-09-10 07:44:43 simons Exp $

 * include/asm-sparc/processor.h

 *

 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)

 */

#ifndef __ASM_SPARC_PROCESSOR_H

#define __ASM_SPARC_PROCESSOR_H

#include <linux/a.out.h>

#include <asm/psr.h>

#include <asm/ptrace.h>

#include <asm/head.h>

#include <asm/signal.h>

#include <asm/segment.h>

/*

 * Bus types

 */

#define EISA_bus 0

#define EISA_bus__is_a_macro /* for versions in ksyms.c */

#define MCA_bus 0

#define MCA_bus__is_a_macro /* for versions in ksyms.c */

/*

 * The sparc has no problems with write protection

 */

#define wp_works_ok 1

#define wp_works_ok__is_a_macro /* for versions in ksyms.c */

/* Whee, this is STACK_TOP and the lowest kernel address too... */

#define TASK_SIZE       (KERNBASE)

#define MAX_USER_ADDR   TASK_SIZE

#define MMAP_SEARCH_START (TASK_SIZE/3)

/* The Sparc processor specific thread struct. */

struct thread_struct {

        unsigned long uwinmask __attribute__ ((aligned (8)));

        struct pt_regs *kregs;

        /* For signal handling */

        unsigned long sig_address __attribute__ ((aligned (8)));

        unsigned long sig_desc;

        /* Context switch saved kernel state. */

        unsigned long ksp __attribute__ ((aligned (8)));

        unsigned long kpc;

        unsigned long kpsr;

        unsigned long kwim;

        /* Special child fork kpsr/kwim values. */

        unsigned long fork_kpsr __attribute__ ((aligned (8)));

        unsigned long fork_kwim;

        /* A place to store user windows and stack pointers

         * when the stack needs inspection.

         */

#define NSWINS 8

        struct reg_window reg_window[NSWINS] __attribute__ ((aligned (8)));

        unsigned long rwbuf_stkptrs[NSWINS] __attribute__ ((aligned (8)));

        unsigned long w_saved;

        /* Floating point regs */

        unsigned long   float_regs[64] __attribute__ ((aligned (8)));

        unsigned long   fsr;

        unsigned long   fpqdepth;

        struct fpq {

                unsigned long *insn_addr;

                unsigned long insn;

        } fpqueue[16];

        struct sigstack sstk_info;

        unsigned long flags;

        int current_ds;

        struct exec core_exec;     /* just what it says. */

};

#define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */

#define INIT_MMAP { &init_mm, (0), (0), \

                    __pgprot(0x0) , VM_READ | VM_WRITE | VM_EXEC }

#define INIT_TSS  { \

/* uwinmask, kregs, sig_address, sig_desc, ksp, kpc, kpsr, kwim */ \

   0,        0,     0,           0,        0,   0,   0,    0, \

/* fork_kpsr, fork_kwim */ \

   0,         0, \

/* reg_window */  \

{ { { 0, }, { 0, } }, }, \

/* rwbuf_stkptrs */  \

{ 0, 0, 0, 0, 0, 0, 0, 0, }, \

/* w_saved */ \

   0, \

/* FPU regs */   { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \

                   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \

                   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \

                   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, \

/* FPU status, FPU qdepth, FPU queue */ \

   0,          0,  { { 0, 0, }, }, \

/* sstk_info */ \

{ 0, 0, }, \

/* flags,              current_ds, */ \

   SPARC_FLAG_KTHREAD, USER_DS, \

/* core_exec */ \

{ 0, }, \

}

/* Return saved PC of a blocked thread. */

extern inline unsigned long thread_saved_pc(struct thread_struct *t)

{

        return t->kregs->pc;

}

/*

 * Do necessary setup to start up a newly executed thread.

 */

extern inline void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)

{

        unsigned long saved_psr = (regs->psr & (PSR_CWP)) | PSR_S;

        int i;

        for(i = 0; i < 16; i++) regs->u_regs[i] = 0;

        regs->y = 0;

        regs->pc = ((pc & (~3)) - 4);

        regs->npc = regs->pc + 4;

        regs->psr = saved_psr;

        regs->u_regs[UREG_FP] = (sp - REGWIN_SZ);

}

#ifdef __KERNEL__

extern unsigned long (*alloc_kernel_stack)(struct task_struct *tsk);

extern void (*free_kernel_stack)(unsigned long stack);

extern struct task_struct *(*alloc_task_struct)(void);

extern void (*free_task_struct)(struct task_struct *tsk);

#endif

#endif /* __ASM_SPARC_PROCESSOR_H */