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1/* $Id: processor.h,v 1.83 2001/10/08 09:32:13 davem Exp $
2 * include/asm-sparc/processor.h
3 *
4 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
5 */
6
7#ifndef __ASM_SPARC_PROCESSOR_H
8#define __ASM_SPARC_PROCESSOR_H
9
10/*
11 * Sparc32 implementation of macro that returns current
12 * instruction pointer ("program counter").
13 */
14#define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
15
16#include <linux/a.out.h>
17
18#include <asm/psr.h>
19#include <asm/ptrace.h>
20#include <asm/head.h>
21#include <asm/signal.h>
22#include <asm/btfixup.h>
23#include <asm/page.h>
24
25/*
26 * The sparc has no problems with write protection
27 */
28#define wp_works_ok 1
29#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
30
31/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
32 * That one page is used to protect kernel from intruders, so that
33 * we can make our access_ok test faster
34 */
35#define TASK_SIZE PAGE_OFFSET
36
37struct task_struct;
38
39#ifdef __KERNEL__
40struct fpq {
41 unsigned long *insn_addr;
42 unsigned long insn;
43};
44#endif
45
46typedef struct {
47 int seg;
48} mm_segment_t;
49
50/* The Sparc processor specific thread struct. */
51struct thread_struct {
52 struct pt_regs *kregs;
53 unsigned int _pad1;
54
55 /* Special child fork kpsr/kwim values. */
56 unsigned long fork_kpsr __attribute__ ((aligned (8)));
57 unsigned long fork_kwim;
58
59 /* Floating point regs */
60 unsigned long float_regs[32] __attribute__ ((aligned (8)));
61 unsigned long fsr;
62 unsigned long fpqdepth;
63 struct fpq fpqueue[16];
64 unsigned long flags;
65 mm_segment_t current_ds;
66 struct exec core_exec; /* just what it says. */
67 int new_signal;
68};
69
70#define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
71#define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
72
73#define INIT_THREAD { \
74 .flags = SPARC_FLAG_KTHREAD, \
75 .current_ds = KERNEL_DS, \
76}
77
78/* Return saved PC of a blocked thread. */
79extern unsigned long thread_saved_pc(struct task_struct *t);
80
81/* Do necessary setup to start up a newly executed thread. */
82static inline void start_thread(struct pt_regs * regs, unsigned long pc,
83 unsigned long sp)
84{
85 register unsigned long zero asm("g1");
86
87 regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
88 regs->pc = ((pc & (~3)) - 4);
89 regs->npc = regs->pc + 4;
90 regs->y = 0;
91 zero = 0;
92 __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
93 "std\t%%g0, [%0 + %3 + 0x08]\n\t"
94 "std\t%%g0, [%0 + %3 + 0x10]\n\t"
95 "std\t%%g0, [%0 + %3 + 0x18]\n\t"
96 "std\t%%g0, [%0 + %3 + 0x20]\n\t"
97 "std\t%%g0, [%0 + %3 + 0x28]\n\t"
98 "std\t%%g0, [%0 + %3 + 0x30]\n\t"
99 "st\t%1, [%0 + %3 + 0x38]\n\t"
100 "st\t%%g0, [%0 + %3 + 0x3c]"
101 : /* no outputs */
102 : "r" (regs),
103 "r" (sp - sizeof(struct reg_window)),
104 "r" (zero),
105 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
106 : "memory");
107}
108
109/* Free all resources held by a thread. */
110#define release_thread(tsk) do { } while(0)
111extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
112
113/* Prepare to copy thread state - unlazy all lazy status */
114#define prepare_to_copy(tsk) do { } while (0)
115
116extern unsigned long get_wchan(struct task_struct *);
117
118#define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
119#define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
120
121#ifdef __KERNEL__
122
123extern struct task_struct *last_task_used_math;
124
125#define cpu_relax() barrier()
126
127#endif
128
129#endif /* __ASM_SPARC_PROCESSOR_H */