Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 mm_segment_t current_ds;
54};
55
56#define INIT_THREAD { \
57 .current_ds = KERNEL_DS, \
58 .kregs = (struct pt_regs *)(init_stack+THREAD_SIZE)-1 \
59}
60
61/* Do necessary setup to start up a newly executed thread. */
62static inline void start_thread(struct pt_regs * regs, unsigned long pc,
63 unsigned long sp)
64{
65 register unsigned long zero asm("g1");
66
67 regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
68 regs->pc = ((pc & (~3)) - 4);
69 regs->npc = regs->pc + 4;
70 regs->y = 0;
71 zero = 0;
72 __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
73 "std\t%%g0, [%0 + %3 + 0x08]\n\t"
74 "std\t%%g0, [%0 + %3 + 0x10]\n\t"
75 "std\t%%g0, [%0 + %3 + 0x18]\n\t"
76 "std\t%%g0, [%0 + %3 + 0x20]\n\t"
77 "std\t%%g0, [%0 + %3 + 0x28]\n\t"
78 "std\t%%g0, [%0 + %3 + 0x30]\n\t"
79 "st\t%1, [%0 + %3 + 0x38]\n\t"
80 "st\t%%g0, [%0 + %3 + 0x3c]"
81 : /* no outputs */
82 : "r" (regs),
83 "r" (sp - sizeof(struct reg_window32)),
84 "r" (zero),
85 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
86 : "memory");
87}
88
89/* Free all resources held by a thread. */
90#define release_thread(tsk) do { } while(0)
91
92unsigned long get_wchan(struct task_struct *);
93
94#define task_pt_regs(tsk) ((tsk)->thread.kregs)
95#define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
96#define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
97
98#ifdef __KERNEL__
99
100extern struct task_struct *last_task_used_math;
101int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
102
103#define cpu_relax() barrier()
104
105extern void (*sparc_idle)(void);
106
107#endif
108
109#endif /* __ASM_SPARC_PROCESSOR_H */