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9cce7a43 CM |
1 | /* |
2 | * Based on arch/arm/include/asm/processor.h | |
3 | * | |
4 | * Copyright (C) 1995-1999 Russell King | |
5 | * Copyright (C) 2012 ARM Ltd. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | #ifndef __ASM_PROCESSOR_H | |
20 | #define __ASM_PROCESSOR_H | |
21 | ||
22 | /* | |
23 | * Default implementation of macro that returns current | |
24 | * instruction pointer ("program counter"). | |
25 | */ | |
26 | #define current_text_addr() ({ __label__ _l; _l: &&_l;}) | |
27 | ||
28 | #ifdef __KERNEL__ | |
29 | ||
30 | #include <linux/string.h> | |
31 | ||
32 | #include <asm/fpsimd.h> | |
33 | #include <asm/hw_breakpoint.h> | |
34 | #include <asm/ptrace.h> | |
35 | #include <asm/types.h> | |
36 | ||
37 | #ifdef __KERNEL__ | |
38 | #define STACK_TOP_MAX TASK_SIZE_64 | |
39 | #ifdef CONFIG_COMPAT | |
40 | #define AARCH32_VECTORS_BASE 0xffff0000 | |
41 | #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ | |
42 | AARCH32_VECTORS_BASE : STACK_TOP_MAX) | |
43 | #else | |
44 | #define STACK_TOP STACK_TOP_MAX | |
45 | #endif /* CONFIG_COMPAT */ | |
46 | #endif /* __KERNEL__ */ | |
47 | ||
48 | struct debug_info { | |
49 | /* Have we suspended stepping by a debugger? */ | |
50 | int suspended_step; | |
51 | /* Allow breakpoints and watchpoints to be disabled for this thread. */ | |
52 | int bps_disabled; | |
53 | int wps_disabled; | |
54 | /* Hardware breakpoints pinned to this task. */ | |
55 | struct perf_event *hbp_break[ARM_MAX_BRP]; | |
56 | struct perf_event *hbp_watch[ARM_MAX_WRP]; | |
57 | }; | |
58 | ||
59 | struct cpu_context { | |
60 | unsigned long x19; | |
61 | unsigned long x20; | |
62 | unsigned long x21; | |
63 | unsigned long x22; | |
64 | unsigned long x23; | |
65 | unsigned long x24; | |
66 | unsigned long x25; | |
67 | unsigned long x26; | |
68 | unsigned long x27; | |
69 | unsigned long x28; | |
70 | unsigned long fp; | |
71 | unsigned long sp; | |
72 | unsigned long pc; | |
73 | }; | |
74 | ||
75 | struct thread_struct { | |
76 | struct cpu_context cpu_context; /* cpu context */ | |
77 | unsigned long tp_value; | |
78 | struct fpsimd_state fpsimd_state; | |
79 | unsigned long fault_address; /* fault info */ | |
80 | struct debug_info debug; /* debugging */ | |
81 | }; | |
82 | ||
83 | #define INIT_THREAD { } | |
84 | ||
85 | static inline void start_thread_common(struct pt_regs *regs, unsigned long pc) | |
86 | { | |
87 | memset(regs, 0, sizeof(*regs)); | |
88 | regs->syscallno = ~0UL; | |
89 | regs->pc = pc; | |
90 | } | |
91 | ||
92 | static inline void start_thread(struct pt_regs *regs, unsigned long pc, | |
93 | unsigned long sp) | |
94 | { | |
9cce7a43 CM |
95 | start_thread_common(regs, pc); |
96 | regs->pstate = PSR_MODE_EL0t; | |
97 | regs->sp = sp; | |
9cce7a43 CM |
98 | } |
99 | ||
100 | #ifdef CONFIG_COMPAT | |
101 | static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc, | |
102 | unsigned long sp) | |
103 | { | |
9cce7a43 CM |
104 | start_thread_common(regs, pc); |
105 | regs->pstate = COMPAT_PSR_MODE_USR; | |
106 | if (pc & 1) | |
107 | regs->pstate |= COMPAT_PSR_T_BIT; | |
108 | regs->compat_sp = sp; | |
9cce7a43 CM |
109 | } |
110 | #endif | |
111 | ||
112 | /* Forward declaration, a strange C thing */ | |
113 | struct task_struct; | |
114 | ||
115 | /* Free all resources held by a thread. */ | |
116 | extern void release_thread(struct task_struct *); | |
117 | ||
118 | /* Prepare to copy thread state - unlazy all lazy status */ | |
119 | #define prepare_to_copy(tsk) do { } while (0) | |
120 | ||
121 | unsigned long get_wchan(struct task_struct *p); | |
122 | ||
123 | #define cpu_relax() barrier() | |
124 | ||
125 | /* Thread switching */ | |
126 | extern struct task_struct *cpu_switch_to(struct task_struct *prev, | |
127 | struct task_struct *next); | |
128 | ||
129 | /* | |
130 | * Create a new kernel thread | |
131 | */ | |
132 | extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); | |
133 | ||
134 | #define task_pt_regs(p) \ | |
135 | ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) | |
136 | ||
137 | #define KSTK_EIP(tsk) task_pt_regs(tsk)->pc | |
138 | #define KSTK_ESP(tsk) task_pt_regs(tsk)->sp | |
139 | ||
140 | /* | |
141 | * Prefetching support | |
142 | */ | |
143 | #define ARCH_HAS_PREFETCH | |
144 | static inline void prefetch(const void *ptr) | |
145 | { | |
146 | asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr)); | |
147 | } | |
148 | ||
149 | #define ARCH_HAS_PREFETCHW | |
150 | static inline void prefetchw(const void *ptr) | |
151 | { | |
152 | asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr)); | |
153 | } | |
154 | ||
155 | #define ARCH_HAS_SPINLOCK_PREFETCH | |
156 | static inline void spin_lock_prefetch(const void *x) | |
157 | { | |
158 | prefetchw(x); | |
159 | } | |
160 | ||
161 | #define HAVE_ARCH_PICK_MMAP_LAYOUT | |
162 | ||
163 | #endif | |
164 | ||
165 | #endif /* __ASM_PROCESSOR_H */ |