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 #define ARCH_LOW_ADDRESS_LIMIT PHYS_MASK
49 #endif /* __KERNEL__ */
50
51 struct debug_info {
52 /* Have we suspended stepping by a debugger? */
53 int suspended_step;
54 /* Allow breakpoints and watchpoints to be disabled for this thread. */
55 int bps_disabled;
56 int wps_disabled;
57 /* Hardware breakpoints pinned to this task. */
58 struct perf_event *hbp_break[ARM_MAX_BRP];
59 struct perf_event *hbp_watch[ARM_MAX_WRP];
60 };
61
62 struct cpu_context {
63 unsigned long x19;
64 unsigned long x20;
65 unsigned long x21;
66 unsigned long x22;
67 unsigned long x23;
68 unsigned long x24;
69 unsigned long x25;
70 unsigned long x26;
71 unsigned long x27;
72 unsigned long x28;
73 unsigned long fp;
74 unsigned long sp;
75 unsigned long pc;
76 };
77
78 struct thread_struct {
79 struct cpu_context cpu_context; /* cpu context */
80 unsigned long tp_value;
81 struct fpsimd_state fpsimd_state;
82 unsigned long fault_address; /* fault info */
83 unsigned long fault_code; /* ESR_EL1 value */
84 struct debug_info debug; /* debugging */
85 };
86
87 #define INIT_THREAD { }
88
start_thread_common(struct pt_regs * regs,unsigned long pc)89 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
90 {
91 memset(regs, 0, sizeof(*regs));
92 regs->syscallno = ~0UL;
93 regs->pc = pc;
94 }
95
start_thread(struct pt_regs * regs,unsigned long pc,unsigned long sp)96 static inline void start_thread(struct pt_regs *regs, unsigned long pc,
97 unsigned long sp)
98 {
99 start_thread_common(regs, pc);
100 regs->pstate = PSR_MODE_EL0t;
101 regs->sp = sp;
102 }
103
104 #ifdef CONFIG_COMPAT
compat_start_thread(struct pt_regs * regs,unsigned long pc,unsigned long sp)105 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
106 unsigned long sp)
107 {
108 start_thread_common(regs, pc);
109 regs->pstate = COMPAT_PSR_MODE_USR;
110 if (pc & 1)
111 regs->pstate |= COMPAT_PSR_T_BIT;
112
113 #ifdef __AARCH64EB__
114 regs->pstate |= COMPAT_PSR_E_BIT;
115 #endif
116
117 regs->compat_sp = sp;
118 }
119 #endif
120
121 /* Forward declaration, a strange C thing */
122 struct task_struct;
123
124 /* Free all resources held by a thread. */
125 extern void release_thread(struct task_struct *);
126
127 /* Prepare to copy thread state - unlazy all lazy status */
128 #define prepare_to_copy(tsk) do { } while (0)
129
130 unsigned long get_wchan(struct task_struct *p);
131
132 #define cpu_relax() barrier()
133 #define cpu_relax_lowlatency() cpu_relax()
134
135 /* Thread switching */
136 extern struct task_struct *cpu_switch_to(struct task_struct *prev,
137 struct task_struct *next);
138
139 #define task_pt_regs(p) \
140 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
141
142 #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc)
143 #define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
144
145 /*
146 * Prefetching support
147 */
148 #define ARCH_HAS_PREFETCH
prefetch(const void * ptr)149 static inline void prefetch(const void *ptr)
150 {
151 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr));
152 }
153
154 #define ARCH_HAS_PREFETCHW
prefetchw(const void * ptr)155 static inline void prefetchw(const void *ptr)
156 {
157 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr));
158 }
159
160 #define ARCH_HAS_SPINLOCK_PREFETCH
spin_lock_prefetch(const void * x)161 static inline void spin_lock_prefetch(const void *x)
162 {
163 prefetchw(x);
164 }
165
166 #define HAVE_ARCH_PICK_MMAP_LAYOUT
167
168 #endif
169
170 void cpu_enable_pan(void *__unused);
171 void cpu_enable_uao(void *__unused);
172
173 #endif /* __ASM_PROCESSOR_H */
174