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