1/* SPDX-License-Identifier: GPL-2.0 */
2/* include/asm/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#include <asm/psr.h>
11#include <asm/ptrace.h>
12#include <asm/head.h>
13#include <asm/signal.h>
14#include <asm/page.h>
15
16/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
17 * That one page is used to protect kernel from intruders, so that
18 * we can make our access_ok test faster
19 */
20#define TASK_SIZE	PAGE_OFFSET
21#ifdef __KERNEL__
22#define STACK_TOP	(PAGE_OFFSET - PAGE_SIZE)
23#define STACK_TOP_MAX	STACK_TOP
24#endif /* __KERNEL__ */
25
26struct task_struct;
27
28#ifdef __KERNEL__
29struct fpq {
30	unsigned long *insn_addr;
31	unsigned long insn;
32};
33#endif
34
35typedef struct {
36	int seg;
37} mm_segment_t;
38
39/* The Sparc processor specific thread struct. */
40struct thread_struct {
41	struct pt_regs *kregs;
42	unsigned int _pad1;
43
44	/* Special child fork kpsr/kwim values. */
45	unsigned long fork_kpsr __attribute__ ((aligned (8)));
46	unsigned long fork_kwim;
47
48	/* Floating point regs */
49	unsigned long   float_regs[32] __attribute__ ((aligned (8)));
50	unsigned long   fsr;
51	unsigned long   fpqdepth;
52	struct fpq	fpqueue[16];
53	unsigned long flags;
54	mm_segment_t current_ds;
55};
56
57#define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
58#define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
59
60#define INIT_THREAD  { \
61	.flags = SPARC_FLAG_KTHREAD, \
62	.current_ds = KERNEL_DS, \
63}
64
65/* Do necessary setup to start up a newly executed thread. */
66static inline void start_thread(struct pt_regs * regs, unsigned long pc,
67				    unsigned long sp)
68{
69	register unsigned long zero asm("g1");
70
71	regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
72	regs->pc = ((pc & (~3)) - 4);
73	regs->npc = regs->pc + 4;
74	regs->y = 0;
75	zero = 0;
76	__asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
77			     "std\t%%g0, [%0 + %3 + 0x08]\n\t"
78			     "std\t%%g0, [%0 + %3 + 0x10]\n\t"
79			     "std\t%%g0, [%0 + %3 + 0x18]\n\t"
80			     "std\t%%g0, [%0 + %3 + 0x20]\n\t"
81			     "std\t%%g0, [%0 + %3 + 0x28]\n\t"
82			     "std\t%%g0, [%0 + %3 + 0x30]\n\t"
83			     "st\t%1, [%0 + %3 + 0x38]\n\t"
84			     "st\t%%g0, [%0 + %3 + 0x3c]"
85			     : /* no outputs */
86			     : "r" (regs),
87			       "r" (sp - sizeof(struct reg_window32)),
88			       "r" (zero),
89			       "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
90			     : "memory");
91}
92
93/* Free all resources held by a thread. */
94#define release_thread(tsk)		do { } while(0)
95
96unsigned long get_wchan(struct task_struct *);
97
98#define task_pt_regs(tsk) ((tsk)->thread.kregs)
99#define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
100#define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
101
102#ifdef __KERNEL__
103
104extern struct task_struct *last_task_used_math;
105int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
106
107#define cpu_relax()	barrier()
108
109extern void (*sparc_idle)(void);
110
111#endif
112
113#endif /* __ASM_SPARC_PROCESSOR_H */
114