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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 */ | |
f483a853 WD |
46 | |
47 | #define ARCH_LOW_ADDRESS_LIMIT PHYS_MASK | |
9cce7a43 CM |
48 | #endif /* __KERNEL__ */ |
49 | ||
50 | struct debug_info { | |
51 | /* Have we suspended stepping by a debugger? */ | |
52 | int suspended_step; | |
53 | /* Allow breakpoints and watchpoints to be disabled for this thread. */ | |
54 | int bps_disabled; | |
55 | int wps_disabled; | |
56 | /* Hardware breakpoints pinned to this task. */ | |
57 | struct perf_event *hbp_break[ARM_MAX_BRP]; | |
58 | struct perf_event *hbp_watch[ARM_MAX_WRP]; | |
59 | }; | |
60 | ||
61 | struct cpu_context { | |
62 | unsigned long x19; | |
63 | unsigned long x20; | |
64 | unsigned long x21; | |
65 | unsigned long x22; | |
66 | unsigned long x23; | |
67 | unsigned long x24; | |
68 | unsigned long x25; | |
69 | unsigned long x26; | |
70 | unsigned long x27; | |
71 | unsigned long x28; | |
72 | unsigned long fp; | |
73 | unsigned long sp; | |
74 | unsigned long pc; | |
75 | }; | |
76 | ||
77 | struct thread_struct { | |
78 | struct cpu_context cpu_context; /* cpu context */ | |
79 | unsigned long tp_value; | |
80 | struct fpsimd_state fpsimd_state; | |
81 | unsigned long fault_address; /* fault info */ | |
82 | struct debug_info debug; /* debugging */ | |
83 | }; | |
84 | ||
85 | #define INIT_THREAD { } | |
86 | ||
87 | static inline void start_thread_common(struct pt_regs *regs, unsigned long pc) | |
88 | { | |
89 | memset(regs, 0, sizeof(*regs)); | |
90 | regs->syscallno = ~0UL; | |
91 | regs->pc = pc; | |
92 | } | |
93 | ||
94 | static inline void start_thread(struct pt_regs *regs, unsigned long pc, | |
95 | unsigned long sp) | |
96 | { | |
9cce7a43 CM |
97 | start_thread_common(regs, pc); |
98 | regs->pstate = PSR_MODE_EL0t; | |
99 | regs->sp = sp; | |
9cce7a43 CM |
100 | } |
101 | ||
102 | #ifdef CONFIG_COMPAT | |
103 | static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc, | |
104 | unsigned long sp) | |
105 | { | |
9cce7a43 CM |
106 | start_thread_common(regs, pc); |
107 | regs->pstate = COMPAT_PSR_MODE_USR; | |
108 | if (pc & 1) | |
109 | regs->pstate |= COMPAT_PSR_T_BIT; | |
110 | regs->compat_sp = sp; | |
9cce7a43 CM |
111 | } |
112 | #endif | |
113 | ||
114 | /* Forward declaration, a strange C thing */ | |
115 | struct task_struct; | |
116 | ||
117 | /* Free all resources held by a thread. */ | |
118 | extern void release_thread(struct task_struct *); | |
119 | ||
120 | /* Prepare to copy thread state - unlazy all lazy status */ | |
121 | #define prepare_to_copy(tsk) do { } while (0) | |
122 | ||
123 | unsigned long get_wchan(struct task_struct *p); | |
124 | ||
125 | #define cpu_relax() barrier() | |
126 | ||
127 | /* Thread switching */ | |
128 | extern struct task_struct *cpu_switch_to(struct task_struct *prev, | |
129 | struct task_struct *next); | |
130 | ||
9cce7a43 CM |
131 | #define task_pt_regs(p) \ |
132 | ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) | |
133 | ||
134 | #define KSTK_EIP(tsk) task_pt_regs(tsk)->pc | |
135 | #define KSTK_ESP(tsk) task_pt_regs(tsk)->sp | |
136 | ||
137 | /* | |
138 | * Prefetching support | |
139 | */ | |
140 | #define ARCH_HAS_PREFETCH | |
141 | static inline void prefetch(const void *ptr) | |
142 | { | |
143 | asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr)); | |
144 | } | |
145 | ||
146 | #define ARCH_HAS_PREFETCHW | |
147 | static inline void prefetchw(const void *ptr) | |
148 | { | |
149 | asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr)); | |
150 | } | |
151 | ||
152 | #define ARCH_HAS_SPINLOCK_PREFETCH | |
153 | static inline void spin_lock_prefetch(const void *x) | |
154 | { | |
155 | prefetchw(x); | |
156 | } | |
157 | ||
158 | #define HAVE_ARCH_PICK_MMAP_LAYOUT | |
159 | ||
160 | #endif | |
161 | ||
162 | #endif /* __ASM_PROCESSOR_H */ |