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/pgtable-hwdef.h>
35 #include <asm/ptrace.h>
36 #include <asm/types.h>
37
38 #ifdef __KERNEL__
39 #define STACK_TOP_MAX TASK_SIZE_64
40 #ifdef CONFIG_COMPAT
41 #define AARCH32_VECTORS_BASE 0xffff0000
42 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
43 AARCH32_VECTORS_BASE : STACK_TOP_MAX)
44 #else
45 #define STACK_TOP STACK_TOP_MAX
46 #endif /* CONFIG_COMPAT */
47
48 extern phys_addr_t arm64_dma_phys_limit;
49 #define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1)
50 #endif /* __KERNEL__ */
51
52 struct debug_info {
53 /* Have we suspended stepping by a debugger? */
54 int suspended_step;
55 /* Allow breakpoints and watchpoints to be disabled for this thread. */
56 int bps_disabled;
57 int wps_disabled;
58 /* Hardware breakpoints pinned to this task. */
59 struct perf_event *hbp_break[ARM_MAX_BRP];
60 struct perf_event *hbp_watch[ARM_MAX_WRP];
61 };
62
63 struct cpu_context {
64 unsigned long x19;
65 unsigned long x20;
66 unsigned long x21;
67 unsigned long x22;
68 unsigned long x23;
69 unsigned long x24;
70 unsigned long x25;
71 unsigned long x26;
72 unsigned long x27;
73 unsigned long x28;
74 unsigned long fp;
75 unsigned long sp;
76 unsigned long pc;
77 };
78
79 struct thread_struct {
80 struct cpu_context cpu_context; /* cpu context */
81 unsigned long tp_value;
82 struct fpsimd_state fpsimd_state;
83 unsigned long fault_address; /* fault info */
84 unsigned long fault_code; /* ESR_EL1 value */
85 struct debug_info debug; /* debugging */
86 };
87
88 #define INIT_THREAD { }
89
start_thread_common(struct pt_regs * regs,unsigned long pc)90 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
91 {
92 memset(regs, 0, sizeof(*regs));
93 regs->syscallno = ~0UL;
94 regs->pc = pc;
95 }
96
start_thread(struct pt_regs * regs,unsigned long pc,unsigned long sp)97 static inline void start_thread(struct pt_regs *regs, unsigned long pc,
98 unsigned long sp)
99 {
100 start_thread_common(regs, pc);
101 regs->pstate = PSR_MODE_EL0t;
102 regs->sp = sp;
103 }
104
105 #ifdef CONFIG_COMPAT
compat_start_thread(struct pt_regs * regs,unsigned long pc,unsigned long sp)106 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
107 unsigned long sp)
108 {
109 start_thread_common(regs, pc);
110 regs->pstate = COMPAT_PSR_MODE_USR;
111 if (pc & 1)
112 regs->pstate |= COMPAT_PSR_T_BIT;
113
114 #ifdef __AARCH64EB__
115 regs->pstate |= COMPAT_PSR_E_BIT;
116 #endif
117
118 regs->compat_sp = sp;
119 }
120 #endif
121
122 /* Forward declaration, a strange C thing */
123 struct task_struct;
124
125 /* Free all resources held by a thread. */
126 extern void release_thread(struct task_struct *);
127
128 unsigned long get_wchan(struct task_struct *p);
129
cpu_relax(void)130 static inline void cpu_relax(void)
131 {
132 asm volatile("yield" ::: "memory");
133 }
134
135 #define cpu_relax_lowlatency() cpu_relax()
136
137 /* Thread switching */
138 extern struct task_struct *cpu_switch_to(struct task_struct *prev,
139 struct task_struct *next);
140
141 #define task_pt_regs(p) \
142 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
143
144 #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc)
145 #define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
146
147 /*
148 * Prefetching support
149 */
150 #define ARCH_HAS_PREFETCH
prefetch(const void * ptr)151 static inline void prefetch(const void *ptr)
152 {
153 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr));
154 }
155
156 #define ARCH_HAS_PREFETCHW
prefetchw(const void * ptr)157 static inline void prefetchw(const void *ptr)
158 {
159 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr));
160 }
161
162 #define ARCH_HAS_SPINLOCK_PREFETCH
spin_lock_prefetch(const void * x)163 static inline void spin_lock_prefetch(const void *x)
164 {
165 prefetchw(x);
166 }
167
168 #define HAVE_ARCH_PICK_MMAP_LAYOUT
169
170 #endif
171
172 #endif /* __ASM_PROCESSOR_H */
173