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
47 #define ARCH_LOW_ADDRESS_LIMIT PHYS_MASK
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
start_thread_common(struct pt_regs * regs,unsigned long pc)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
start_thread(struct pt_regs * regs,unsigned long pc,unsigned long sp)94 static inline void start_thread(struct pt_regs *regs, unsigned long pc,
95 unsigned long sp)
96 {
97 start_thread_common(regs, pc);
98 regs->pstate = PSR_MODE_EL0t;
99 regs->sp = sp;
100 }
101
102 #ifdef CONFIG_COMPAT
compat_start_thread(struct pt_regs * regs,unsigned long pc,unsigned long sp)103 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
104 unsigned long sp)
105 {
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;
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
131 #define task_pt_regs(p) \
132 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
133
134 #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc)
135 #define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
136
137 /*
138 * Prefetching support
139 */
140 #define ARCH_HAS_PREFETCH
prefetch(const void * ptr)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
prefetchw(const void * ptr)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
spin_lock_prefetch(const void * x)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 */
163