Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
4 */
5#ifndef _ASM_PROCESSOR_H
6#define _ASM_PROCESSOR_H
7
8#include <linux/atomic.h>
9#include <linux/cpumask.h>
10#include <linux/sizes.h>
11
12#include <asm/cpu.h>
13#include <asm/cpu-info.h>
14#include <asm/hw_breakpoint.h>
15#include <asm/loongarch.h>
16#include <asm/vdso/processor.h>
17#include <uapi/asm/ptrace.h>
18#include <uapi/asm/sigcontext.h>
19
20#ifdef CONFIG_32BIT
21
22#define TASK_SIZE 0x80000000UL
23#define TASK_SIZE_MIN TASK_SIZE
24#define STACK_TOP_MAX TASK_SIZE
25
26#define TASK_IS_32BIT_ADDR 1
27
28#endif
29
30#ifdef CONFIG_64BIT
31
32#define TASK_SIZE32 0x100000000UL
33#define TASK_SIZE64 (0x1UL << ((cpu_vabits > VA_BITS) ? VA_BITS : cpu_vabits))
34
35#define TASK_SIZE (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
36#define TASK_SIZE_MIN TASK_SIZE32
37#define STACK_TOP_MAX TASK_SIZE64
38
39#define TASK_SIZE_OF(tsk) \
40 (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
41
42#define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR)
43
44#endif
45
46#define VDSO_RANDOMIZE_SIZE (TASK_IS_32BIT_ADDR ? SZ_1M : SZ_64M)
47
48unsigned long stack_top(void);
49#define STACK_TOP stack_top()
50
51/*
52 * This decides where the kernel will search for a free chunk of vm
53 * space during mmap's.
54 */
55#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
56
57#define FPU_REG_WIDTH 256
58#define FPU_ALIGN __attribute__((aligned(32)))
59
60union fpureg {
61 __u32 val32[FPU_REG_WIDTH / 32];
62 __u64 val64[FPU_REG_WIDTH / 64];
63};
64
65#define FPR_IDX(width, idx) (idx)
66
67#define BUILD_FPR_ACCESS(width) \
68static inline u##width get_fpr##width(union fpureg *fpr, unsigned idx) \
69{ \
70 return fpr->val##width[FPR_IDX(width, idx)]; \
71} \
72 \
73static inline void set_fpr##width(union fpureg *fpr, unsigned int idx, \
74 u##width val) \
75{ \
76 fpr->val##width[FPR_IDX(width, idx)] = val; \
77}
78
79BUILD_FPR_ACCESS(32)
80BUILD_FPR_ACCESS(64)
81
82struct loongarch_fpu {
83 unsigned int fcsr;
84 uint64_t fcc; /* 8x8 */
85 union fpureg fpr[NUM_FPU_REGS];
86};
87
88#define INIT_CPUMASK { \
89 {0,} \
90}
91
92#define ARCH_MIN_TASKALIGN 32
93
94struct loongarch_vdso_info;
95
96/*
97 * If you change thread_struct remember to change the #defines below too!
98 */
99struct thread_struct {
100 /* Main processor registers. */
101 unsigned long reg01, reg03, reg22; /* ra sp fp */
102 unsigned long reg23, reg24, reg25, reg26; /* s0-s3 */
103 unsigned long reg27, reg28, reg29, reg30, reg31; /* s4-s8 */
104
105 /* __schedule() return address / call frame address */
106 unsigned long sched_ra;
107 unsigned long sched_cfa;
108
109 /* CSR registers */
110 unsigned long csr_prmd;
111 unsigned long csr_crmd;
112 unsigned long csr_euen;
113 unsigned long csr_ecfg;
114 unsigned long csr_badvaddr; /* Last user fault */
115
116 /* Scratch registers */
117 unsigned long scr0;
118 unsigned long scr1;
119 unsigned long scr2;
120 unsigned long scr3;
121
122 /* Eflags register */
123 unsigned long eflags;
124
125 /* Other stuff associated with the thread. */
126 unsigned long trap_nr;
127 unsigned long error_code;
128 unsigned long single_step; /* Used by PTRACE_SINGLESTEP */
129 struct loongarch_vdso_info *vdso;
130
131 /*
132 * FPU & vector registers, must be at the last of inherited
133 * context because they are conditionally copied at fork().
134 */
135 struct loongarch_fpu fpu FPU_ALIGN;
136
137 /* Hardware breakpoints pinned to this task. */
138 struct perf_event *hbp_break[LOONGARCH_MAX_BRP];
139 struct perf_event *hbp_watch[LOONGARCH_MAX_WRP];
140};
141
142#define thread_saved_ra(tsk) (tsk->thread.sched_ra)
143#define thread_saved_fp(tsk) (tsk->thread.sched_cfa)
144
145#define INIT_THREAD { \
146 /* \
147 * Main processor registers \
148 */ \
149 .reg01 = 0, \
150 .reg03 = 0, \
151 .reg22 = 0, \
152 .reg23 = 0, \
153 .reg24 = 0, \
154 .reg25 = 0, \
155 .reg26 = 0, \
156 .reg27 = 0, \
157 .reg28 = 0, \
158 .reg29 = 0, \
159 .reg30 = 0, \
160 .reg31 = 0, \
161 .sched_ra = 0, \
162 .sched_cfa = 0, \
163 .csr_crmd = 0, \
164 .csr_prmd = 0, \
165 .csr_euen = 0, \
166 .csr_ecfg = 0, \
167 .csr_badvaddr = 0, \
168 /* \
169 * Other stuff associated with the process \
170 */ \
171 .trap_nr = 0, \
172 .error_code = 0, \
173 /* \
174 * FPU & vector registers \
175 */ \
176 .fpu = { \
177 .fcsr = 0, \
178 .fcc = 0, \
179 .fpr = {{{0,},},}, \
180 }, \
181 .hbp_break = {0}, \
182 .hbp_watch = {0}, \
183}
184
185struct task_struct;
186
187enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_HALT, IDLE_NOMWAIT, IDLE_POLL};
188
189extern unsigned long boot_option_idle_override;
190/*
191 * Do necessary setup to start up a newly executed thread.
192 */
193extern void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp);
194
195unsigned long __get_wchan(struct task_struct *p);
196
197#define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \
198 THREAD_SIZE - sizeof(struct pt_regs))
199#define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk))
200#define KSTK_EIP(tsk) (task_pt_regs(tsk)->csr_era)
201#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[3])
202#define KSTK_EUEN(tsk) (task_pt_regs(tsk)->csr_euen)
203#define KSTK_ECFG(tsk) (task_pt_regs(tsk)->csr_ecfg)
204
205#define return_address() ({__asm__ __volatile__("":::"$1"); __builtin_return_address(0);})
206
207#ifdef CONFIG_CPU_HAS_PREFETCH
208
209#define ARCH_HAS_PREFETCH
210#define prefetch(x) __builtin_prefetch((x), 0, 1)
211
212#define ARCH_HAS_PREFETCHW
213#define prefetchw(x) __builtin_prefetch((x), 1, 1)
214
215#endif
216
217#endif /* _ASM_PROCESSOR_H */