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/* 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
/*
* Sparc32 implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
#include <asm/psr.h>
#include <asm/ptrace.h>
#include <asm/head.h>
#include <asm/signal.h>
#include <asm/btfixup.h>
#include <asm/page.h>
/*
* 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
#ifdef __KERNEL__
#define STACK_TOP (PAGE_OFFSET - PAGE_SIZE)
#define STACK_TOP_MAX STACK_TOP
#endif /* __KERNEL__ */
struct task_struct;
#ifdef __KERNEL__
struct fpq {
unsigned long *insn_addr;
unsigned long insn;
};
#endif
typedef struct {
int seg;
} mm_segment_t;
/* The Sparc processor specific thread struct. */
struct thread_struct {
struct pt_regs *kregs;
unsigned int _pad1;
/* Special child fork kpsr/kwim values. */
unsigned long fork_kpsr __attribute__ ((aligned (8)));
unsigned long fork_kwim;
/* Floating point regs */
unsigned long float_regs[32] __attribute__ ((aligned (8)));
unsigned long fsr;
unsigned long fpqdepth;
struct fpq fpqueue[16];
unsigned long flags;
mm_segment_t current_ds;
};
#define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
#define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
#define INIT_THREAD { \
.flags = SPARC_FLAG_KTHREAD, \
.current_ds = KERNEL_DS, \
}
/* Return saved PC of a blocked thread. */
extern unsigned long thread_saved_pc(struct task_struct *t);
/* Do necessary setup to start up a newly executed thread. */
static 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]"
: /* no outputs */
: "r" (regs),
"r" (sp - sizeof(struct reg_window)),
"r" (zero),
"i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
: "memory");
}
/* Free all resources held by a thread. */
#define release_thread(tsk) do { } while(0)
extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
extern unsigned long get_wchan(struct task_struct *);
#define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
#define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
#ifdef __KERNEL__
extern struct task_struct *last_task_used_math;
#define cpu_relax() barrier()
#endif
#endif /* __ASM_SPARC_PROCESSOR_H */
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