Linux kernel mirror (for testing)
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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/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
48extern phys_addr_t arm64_dma_phys_limit;
49#define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1)
50#endif /* __KERNEL__ */
51
52struct 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
63struct 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
79struct 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
90static 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
97static 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
106static 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 */
123struct task_struct;
124
125/* Free all resources held by a thread. */
126extern void release_thread(struct task_struct *);
127
128unsigned long get_wchan(struct task_struct *p);
129
130#define cpu_relax() barrier()
131#define cpu_relax_lowlatency() cpu_relax()
132
133/* Thread switching */
134extern struct task_struct *cpu_switch_to(struct task_struct *prev,
135 struct task_struct *next);
136
137#define task_pt_regs(p) \
138 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
139
140#define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc)
141#define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
142
143/*
144 * Prefetching support
145 */
146#define ARCH_HAS_PREFETCH
147static inline void prefetch(const void *ptr)
148{
149 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr));
150}
151
152#define ARCH_HAS_PREFETCHW
153static inline void prefetchw(const void *ptr)
154{
155 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr));
156}
157
158#define ARCH_HAS_SPINLOCK_PREFETCH
159static inline void spin_lock_prefetch(const void *x)
160{
161 prefetchw(x);
162}
163
164#define HAVE_ARCH_PICK_MMAP_LAYOUT
165
166#endif
167
168#endif /* __ASM_PROCESSOR_H */