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
26 struct task_struct;
27
28 #ifdef __KERNEL__
29 struct fpq {
30 unsigned long *insn_addr;
31 unsigned long insn;
32 };
33 #endif
34
35 typedef struct {
36 int seg;
37 } mm_segment_t;
38
39 /* The Sparc processor specific thread struct. */
40 struct 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. */
start_thread(struct pt_regs * regs,unsigned long pc,unsigned long sp)66 static 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
96 unsigned 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
104 extern struct task_struct *last_task_used_math;
105 int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
106
107 #define cpu_relax() barrier()
108
109 extern void (*sparc_idle)(void);
110
111 #endif
112
113 #endif /* __ASM_SPARC_PROCESSOR_H */
114
