summaryrefslogtreecommitdiff
path: root/arch/loongarch/include/asm/processor.h
blob: 6954dc5d24e9df599b184f63487cd8a1b05a250f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
 */
#ifndef _ASM_PROCESSOR_H
#define _ASM_PROCESSOR_H

#include <linux/atomic.h>
#include <linux/cpumask.h>
#include <linux/sizes.h>

#include <asm/cpu.h>
#include <asm/cpu-info.h>
#include <asm/loongarch.h>
#include <asm/vdso/processor.h>
#include <uapi/asm/ptrace.h>
#include <uapi/asm/sigcontext.h>

#ifdef CONFIG_32BIT

#define TASK_SIZE	0x80000000UL
#define TASK_SIZE_MIN	TASK_SIZE
#define STACK_TOP_MAX	TASK_SIZE

#define TASK_IS_32BIT_ADDR 1

#endif

#ifdef CONFIG_64BIT

#define TASK_SIZE32	0x100000000UL
#define TASK_SIZE64     (0x1UL << ((cpu_vabits > VA_BITS) ? VA_BITS : cpu_vabits))

#define TASK_SIZE	(test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
#define TASK_SIZE_MIN	TASK_SIZE32
#define STACK_TOP_MAX	TASK_SIZE64

#define TASK_SIZE_OF(tsk)						\
	(test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)

#define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR)

#endif

#define VDSO_RANDOMIZE_SIZE	(TASK_IS_32BIT_ADDR ? SZ_1M : SZ_64M)

unsigned long stack_top(void);
#define STACK_TOP stack_top()

/*
 * This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)

#define FPU_REG_WIDTH		256
#define FPU_ALIGN		__attribute__((aligned(32)))

union fpureg {
	__u32	val32[FPU_REG_WIDTH / 32];
	__u64	val64[FPU_REG_WIDTH / 64];
};

#define FPR_IDX(width, idx)	(idx)

#define BUILD_FPR_ACCESS(width) \
static inline u##width get_fpr##width(union fpureg *fpr, unsigned idx)	\
{									\
	return fpr->val##width[FPR_IDX(width, idx)];			\
}									\
									\
static inline void set_fpr##width(union fpureg *fpr, unsigned int idx,	\
				  u##width val)				\
{									\
	fpr->val##width[FPR_IDX(width, idx)] = val;			\
}

BUILD_FPR_ACCESS(32)
BUILD_FPR_ACCESS(64)

struct loongarch_fpu {
	unsigned int	fcsr;
	uint64_t	fcc;	/* 8x8 */
	union fpureg	fpr[NUM_FPU_REGS];
};

#define INIT_CPUMASK { \
	{0,} \
}

#define ARCH_MIN_TASKALIGN	32

struct loongarch_vdso_info;

/*
 * If you change thread_struct remember to change the #defines below too!
 */
struct thread_struct {
	/* Main processor registers. */
	unsigned long reg01, reg03, reg22; /* ra sp fp */
	unsigned long reg23, reg24, reg25, reg26; /* s0-s3 */
	unsigned long reg27, reg28, reg29, reg30, reg31; /* s4-s8 */

	/* __schedule() return address / call frame address */
	unsigned long sched_ra;
	unsigned long sched_cfa;

	/* CSR registers */
	unsigned long csr_prmd;
	unsigned long csr_crmd;
	unsigned long csr_euen;
	unsigned long csr_ecfg;
	unsigned long csr_badvaddr;	/* Last user fault */

	/* Scratch registers */
	unsigned long scr0;
	unsigned long scr1;
	unsigned long scr2;
	unsigned long scr3;

	/* Eflags register */
	unsigned long eflags;

	/* Other stuff associated with the thread. */
	unsigned long trap_nr;
	unsigned long error_code;
	struct loongarch_vdso_info *vdso;

	/*
	 * FPU & vector registers, must be at last because
	 * they are conditionally copied at fork().
	 */
	struct loongarch_fpu fpu FPU_ALIGN;
};

#define thread_saved_ra(tsk)	(tsk->thread.sched_ra)
#define thread_saved_fp(tsk)	(tsk->thread.sched_cfa)

#define INIT_THREAD  {						\
	/*							\
	 * Main processor registers				\
	 */							\
	.reg01			= 0,				\
	.reg03			= 0,				\
	.reg22			= 0,				\
	.reg23			= 0,				\
	.reg24			= 0,				\
	.reg25			= 0,				\
	.reg26			= 0,				\
	.reg27			= 0,				\
	.reg28			= 0,				\
	.reg29			= 0,				\
	.reg30			= 0,				\
	.reg31			= 0,				\
	.sched_ra		= 0,				\
	.sched_cfa		= 0,				\
	.csr_crmd		= 0,				\
	.csr_prmd		= 0,				\
	.csr_euen		= 0,				\
	.csr_ecfg		= 0,				\
	.csr_badvaddr		= 0,				\
	/*							\
	 * Other stuff associated with the process		\
	 */							\
	.trap_nr		= 0,				\
	.error_code		= 0,				\
	/*							\
	 * FPU & vector registers				\
	 */							\
	.fpu			= {				\
		.fcsr		= 0,				\
		.fcc		= 0,				\
		.fpr		= {{{0,},},},			\
	},							\
}

struct task_struct;

enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_HALT, IDLE_NOMWAIT, IDLE_POLL};

extern unsigned long		boot_option_idle_override;
/*
 * Do necessary setup to start up a newly executed thread.
 */
extern void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp);

static inline void flush_thread(void)
{
}

unsigned long __get_wchan(struct task_struct *p);

#define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \
			 THREAD_SIZE - 32 - sizeof(struct pt_regs))
#define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk))
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->csr_era)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[3])
#define KSTK_EUEN(tsk) (task_pt_regs(tsk)->csr_euen)
#define KSTK_ECFG(tsk) (task_pt_regs(tsk)->csr_ecfg)

#define return_address() ({__asm__ __volatile__("":::"$1"); __builtin_return_address(0);})

#ifdef CONFIG_CPU_HAS_PREFETCH

#define ARCH_HAS_PREFETCH
#define prefetch(x) __builtin_prefetch((x), 0, 1)

#define ARCH_HAS_PREFETCHW
#define prefetchw(x) __builtin_prefetch((x), 1, 1)

#endif

#endif /* _ASM_PROCESSOR_H */