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/* $Id: processor.h,v 1.43 1996/03/23 02:40:05 davem 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 */
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