1/* include/asm/processor.h
2 *
3 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
4 */
5
6#ifndef __ASM_SPARC_PROCESSOR_H
7#define __ASM_SPARC_PROCESSOR_H
8
9/*
10 * Sparc32 implementation of macro that returns current
11 * instruction pointer ("program counter").
12 */
13#define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
14
15#include <asm/psr.h>
16#include <asm/ptrace.h>
17#include <asm/head.h>
18#include <asm/signal.h>
19#include <asm/page.h>
20
21/*
22 * The sparc has no problems with write protection
23 */
24#define wp_works_ok 1
25#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
26
27/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
28 * That one page is used to protect kernel from intruders, so that
29 * we can make our access_ok test faster
30 */
31#define TASK_SIZE	PAGE_OFFSET
32#ifdef __KERNEL__
33#define STACK_TOP	(PAGE_OFFSET - PAGE_SIZE)
34#define STACK_TOP_MAX	STACK_TOP
35#endif /* __KERNEL__ */
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};
67
68#define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
69#define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
70
71#define INIT_THREAD  { \
72	.flags = SPARC_FLAG_KTHREAD, \
73	.current_ds = KERNEL_DS, \
74}
75
76/* Return saved PC of a blocked thread. */
77unsigned long thread_saved_pc(struct task_struct *t);
78
79/* Do necessary setup to start up a newly executed thread. */
80static inline void start_thread(struct pt_regs * regs, unsigned long pc,
81				    unsigned long sp)
82{
83	register unsigned long zero asm("g1");
84
85	regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
86	regs->pc = ((pc & (~3)) - 4);
87	regs->npc = regs->pc + 4;
88	regs->y = 0;
89	zero = 0;
90	__asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
91			     "std\t%%g0, [%0 + %3 + 0x08]\n\t"
92			     "std\t%%g0, [%0 + %3 + 0x10]\n\t"
93			     "std\t%%g0, [%0 + %3 + 0x18]\n\t"
94			     "std\t%%g0, [%0 + %3 + 0x20]\n\t"
95			     "std\t%%g0, [%0 + %3 + 0x28]\n\t"
96			     "std\t%%g0, [%0 + %3 + 0x30]\n\t"
97			     "st\t%1, [%0 + %3 + 0x38]\n\t"
98			     "st\t%%g0, [%0 + %3 + 0x3c]"
99			     : /* no outputs */
100			     : "r" (regs),
101			       "r" (sp - sizeof(struct reg_window32)),
102			       "r" (zero),
103			       "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
104			     : "memory");
105}
106
107/* Free all resources held by a thread. */
108#define release_thread(tsk)		do { } while(0)
109
110unsigned long get_wchan(struct task_struct *);
111
112#define task_pt_regs(tsk) ((tsk)->thread.kregs)
113#define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
114#define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
115
116#ifdef __KERNEL__
117
118extern struct task_struct *last_task_used_math;
119int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
120
121#define cpu_relax()	barrier()
122#define cpu_relax_lowlatency() cpu_relax()
123
124extern void (*sparc_idle)(void);
125
126#endif
127
128#endif /* __ASM_SPARC_PROCESSOR_H */
129