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 #define TASK_SIZE_64 (UL(1) << VA_BITS)
23
24 #define KERNEL_DS UL(-1)
25 #define USER_DS (TASK_SIZE_64 - 1)
26
27 #ifndef __ASSEMBLY__
28
29 /*
30 * Default implementation of macro that returns current
31 * instruction pointer ("program counter").
32 */
33 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
34
35 #ifdef __KERNEL__
36
37 #include <linux/string.h>
38
39 #include <asm/alternative.h>
40 #include <asm/fpsimd.h>
41 #include <asm/hw_breakpoint.h>
42 #include <asm/lse.h>
43 #include <asm/pgtable-hwdef.h>
44 #include <asm/ptrace.h>
45 #include <asm/types.h>
46
47 /*
48 * TASK_SIZE - the maximum size of a user space task.
49 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
50 */
51 #ifdef CONFIG_COMPAT
52 #define TASK_SIZE_32 UL(0x100000000)
53 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
54 TASK_SIZE_32 : TASK_SIZE_64)
55 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
56 TASK_SIZE_32 : TASK_SIZE_64)
57 #else
58 #define TASK_SIZE TASK_SIZE_64
59 #endif /* CONFIG_COMPAT */
60
61 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4))
62
63 #define STACK_TOP_MAX TASK_SIZE_64
64 #ifdef CONFIG_COMPAT
65 #define AARCH32_VECTORS_BASE 0xffff0000
66 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
67 AARCH32_VECTORS_BASE : STACK_TOP_MAX)
68 #else
69 #define STACK_TOP STACK_TOP_MAX
70 #endif /* CONFIG_COMPAT */
71
72 extern phys_addr_t arm64_dma_phys_limit;
73 #define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1)
74
75 struct debug_info {
76 /* Have we suspended stepping by a debugger? */
77 int suspended_step;
78 /* Allow breakpoints and watchpoints to be disabled for this thread. */
79 int bps_disabled;
80 int wps_disabled;
81 /* Hardware breakpoints pinned to this task. */
82 struct perf_event *hbp_break[ARM_MAX_BRP];
83 struct perf_event *hbp_watch[ARM_MAX_WRP];
84 };
85
86 struct cpu_context {
87 unsigned long x19;
88 unsigned long x20;
89 unsigned long x21;
90 unsigned long x22;
91 unsigned long x23;
92 unsigned long x24;
93 unsigned long x25;
94 unsigned long x26;
95 unsigned long x27;
96 unsigned long x28;
97 unsigned long fp;
98 unsigned long sp;
99 unsigned long pc;
100 };
101
102 struct thread_struct {
103 struct cpu_context cpu_context; /* cpu context */
104 unsigned long tp_value; /* TLS register */
105 #ifdef CONFIG_COMPAT
106 unsigned long tp2_value;
107 #endif
108 struct fpsimd_state fpsimd_state;
109 unsigned long fault_address; /* fault info */
110 unsigned long fault_code; /* ESR_EL1 value */
111 struct debug_info debug; /* debugging */
112 };
113
114 #ifdef CONFIG_COMPAT
115 #define task_user_tls(t) \
116 ({ \
117 unsigned long *__tls; \
118 if (is_compat_thread(task_thread_info(t))) \
119 __tls = &(t)->thread.tp2_value; \
120 else \
121 __tls = &(t)->thread.tp_value; \
122 __tls; \
123 })
124 #else
125 #define task_user_tls(t) (&(t)->thread.tp_value)
126 #endif
127
128 #define INIT_THREAD { }
129
start_thread_common(struct pt_regs * regs,unsigned long pc)130 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
131 {
132 memset(regs, 0, sizeof(*regs));
133 regs->syscallno = ~0UL;
134 regs->pc = pc;
135 }
136
start_thread(struct pt_regs * regs,unsigned long pc,unsigned long sp)137 static inline void start_thread(struct pt_regs *regs, unsigned long pc,
138 unsigned long sp)
139 {
140 start_thread_common(regs, pc);
141 regs->pstate = PSR_MODE_EL0t;
142 regs->sp = sp;
143 }
144
145 #ifdef CONFIG_COMPAT
compat_start_thread(struct pt_regs * regs,unsigned long pc,unsigned long sp)146 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
147 unsigned long sp)
148 {
149 start_thread_common(regs, pc);
150 regs->pstate = COMPAT_PSR_MODE_USR;
151 if (pc & 1)
152 regs->pstate |= COMPAT_PSR_T_BIT;
153
154 #ifdef __AARCH64EB__
155 regs->pstate |= COMPAT_PSR_E_BIT;
156 #endif
157
158 regs->compat_sp = sp;
159 }
160 #endif
161
162 /* Forward declaration, a strange C thing */
163 struct task_struct;
164
165 /* Free all resources held by a thread. */
166 extern void release_thread(struct task_struct *);
167
168 unsigned long get_wchan(struct task_struct *p);
169
cpu_relax(void)170 static inline void cpu_relax(void)
171 {
172 asm volatile("yield" ::: "memory");
173 }
174
175 #define cpu_relax_lowlatency() cpu_relax()
176
177 /* Thread switching */
178 extern struct task_struct *cpu_switch_to(struct task_struct *prev,
179 struct task_struct *next);
180
181 #define task_pt_regs(p) \
182 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
183
184 #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc)
185 #define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
186
187 /*
188 * Prefetching support
189 */
190 #define ARCH_HAS_PREFETCH
prefetch(const void * ptr)191 static inline void prefetch(const void *ptr)
192 {
193 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr));
194 }
195
196 #define ARCH_HAS_PREFETCHW
prefetchw(const void * ptr)197 static inline void prefetchw(const void *ptr)
198 {
199 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr));
200 }
201
202 #define ARCH_HAS_SPINLOCK_PREFETCH
spin_lock_prefetch(const void * ptr)203 static inline void spin_lock_prefetch(const void *ptr)
204 {
205 asm volatile(ARM64_LSE_ATOMIC_INSN(
206 "prfm pstl1strm, %a0",
207 "nop") : : "p" (ptr));
208 }
209
210 #define HAVE_ARCH_PICK_MMAP_LAYOUT
211
212 #endif
213
214 int cpu_enable_pan(void *__unused);
215 int cpu_enable_uao(void *__unused);
216 int cpu_enable_cache_maint_trap(void *__unused);
217
218 #endif /* __ASSEMBLY__ */
219 #endif /* __ASM_PROCESSOR_H */
220