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
35/* The Sparc processor specific thread struct. */
36struct thread_struct {
37	struct pt_regs *kregs;
38	unsigned int _pad1;
39
40	/* Special child fork kpsr/kwim values. */
41	unsigned long fork_kpsr __attribute__ ((aligned (8)));
42	unsigned long fork_kwim;
43
44	/* Floating point regs */
45	unsigned long   float_regs[32] __attribute__ ((aligned (8)));
46	unsigned long   fsr;
47	unsigned long   fpqdepth;
48	struct fpq	fpqueue[16];
49};
50
51#define INIT_THREAD  { \
52	.kregs = (struct pt_regs *)(init_stack+THREAD_SIZE)-1 \
53}
54
55/* Do necessary setup to start up a newly executed thread. */
56static inline void start_thread(struct pt_regs * regs, unsigned long pc,
57				    unsigned long sp)
58{
59	register unsigned long zero asm("g1");
60
61	regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
62	regs->pc = ((pc & (~3)) - 4);
63	regs->npc = regs->pc + 4;
64	regs->y = 0;
65	zero = 0;
66	__asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
67			     "std\t%%g0, [%0 + %3 + 0x08]\n\t"
68			     "std\t%%g0, [%0 + %3 + 0x10]\n\t"
69			     "std\t%%g0, [%0 + %3 + 0x18]\n\t"
70			     "std\t%%g0, [%0 + %3 + 0x20]\n\t"
71			     "std\t%%g0, [%0 + %3 + 0x28]\n\t"
72			     "std\t%%g0, [%0 + %3 + 0x30]\n\t"
73			     "st\t%1, [%0 + %3 + 0x38]\n\t"
74			     "st\t%%g0, [%0 + %3 + 0x3c]"
75			     : /* no outputs */
76			     : "r" (regs),
77			       "r" (sp - sizeof(struct reg_window32)),
78			       "r" (zero),
79			       "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
80			     : "memory");
81}
82
83unsigned long __get_wchan(struct task_struct *);
84
85#define task_pt_regs(tsk) ((tsk)->thread.kregs)
86#define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
87#define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
88
89#ifdef __KERNEL__
90
91extern struct task_struct *last_task_used_math;
92int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
93
94#define cpu_relax()	barrier()
95
96extern void (*sparc_idle)(void);
97
98#endif
99
100#endif /* __ASM_SPARC_PROCESSOR_H */
101