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/* $Id: processor.h,v 1.59 1997/05/01 01:42:03 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 + PAGE_SIZE and the lowest kernel address too...
* That one page is used to protect kernel from intruders, so that
* we can make our access_ok test faster
*/
#define TASK_SIZE (page_offset)
struct fpq {
unsigned long *insn_addr;
unsigned long insn;
};
/* 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[32] __attribute__ ((aligned (8)));
unsigned long fsr;
unsigned long fpqdepth;
struct fpq fpqueue[16];
struct sigstack sstk_info;
unsigned long flags;
int current_ds;
struct exec core_exec; /* just what it says. */
int new_signal;
};
#define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
#define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
#define INIT_MMAP { &init_mm, (0), (0), \
__pgprot(0x0) , VM_READ | VM_WRITE | VM_EXEC, NULL, &init_mm.mmap }
#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, }, \
/* 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, }, \
/* new_signal */ \
0, \
}
/* Return saved PC of a blocked thread. */
extern __inline__ unsigned long thread_saved_pc(struct thread_struct *t)
{
return t->kpc;
}
/* 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)
{
register unsigned long zero asm("g1");
regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
regs->pc = ((pc & (~3)) - 4);
regs->npc = regs->pc + 4;
regs->y = 0;
zero = 0;
__asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
"std\t%%g0, [%0 + %3 + 0x08]\n\t"
"std\t%%g0, [%0 + %3 + 0x10]\n\t"
"std\t%%g0, [%0 + %3 + 0x18]\n\t"
"std\t%%g0, [%0 + %3 + 0x20]\n\t"
"std\t%%g0, [%0 + %3 + 0x28]\n\t"
"std\t%%g0, [%0 + %3 + 0x30]\n\t"
"st\t%1, [%0 + %3 + 0x38]\n\t"
"st\t%%g0, [%0 + %3 + 0x3c]"
: : "r" (regs), "r" (sp - REGWIN_SZ), "r" (zero),
"i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0])));
}
/* Free all resources held by a thread. */
#define release_thread(tsk) do { } while(0)
#ifdef __KERNEL__
/* Allocation and freeing of basic task resources. */
extern struct task_struct *(*alloc_task_struct)(void);
extern void (*free_task_struct)(struct task_struct *tsk);
#define init_task (init_task_union.task)
#define init_stack (init_task_union.stack)
#endif
/*
* Return_address is a replacement for __builtin_return_address(count)
* which on certain architectures cannot reasonably be implemented in GCC
* (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
* Note that __builtin_return_address(x>=1) is forbidden because the GCC
* aborts compilation on some CPUs. It's simply not possible to unwind
* some CPU's stackframes.
*/
#define return_address() __builtin_return_address(0)
#endif /* __ASM_SPARC_PROCESSOR_H */
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