2 * Based on arch/arm/include/asm/processor.h
4 * Copyright (C) 1995-1999 Russell King
5 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
19 #ifndef __ASM_PROCESSOR_H
20 #define __ASM_PROCESSOR_H
23 * Default implementation of macro that returns current
24 * instruction pointer ("program counter").
26 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
30 #include <linux/string.h>
32 #include <asm/alternative.h>
33 #include <asm/fpsimd.h>
34 #include <asm/hw_breakpoint.h>
36 #include <asm/pgtable-hwdef.h>
37 #include <asm/ptrace.h>
38 #include <asm/types.h>
41 #define STACK_TOP_MAX TASK_SIZE_64
43 #define AARCH32_VECTORS_BASE 0xffff0000
44 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
45 AARCH32_VECTORS_BASE : STACK_TOP_MAX)
47 #define STACK_TOP STACK_TOP_MAX
48 #endif /* CONFIG_COMPAT */
50 extern phys_addr_t arm64_dma_phys_limit
;
51 #define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1)
52 #endif /* __KERNEL__ */
55 /* Have we suspended stepping by a debugger? */
57 /* Allow breakpoints and watchpoints to be disabled for this thread. */
60 /* Hardware breakpoints pinned to this task. */
61 struct perf_event
*hbp_break
[ARM_MAX_BRP
];
62 struct perf_event
*hbp_watch
[ARM_MAX_WRP
];
81 struct thread_struct
{
82 struct cpu_context cpu_context
; /* cpu context */
83 unsigned long tp_value
; /* TLS register */
85 unsigned long tp2_value
;
87 struct fpsimd_state fpsimd_state
;
88 unsigned long fault_address
; /* fault info */
89 unsigned long fault_code
; /* ESR_EL1 value */
90 struct debug_info debug
; /* debugging */
94 #define task_user_tls(t) \
96 unsigned long *__tls; \
97 if (is_compat_thread(task_thread_info(t))) \
98 __tls = &(t)->thread.tp2_value; \
100 __tls = &(t)->thread.tp_value; \
104 #define task_user_tls(t) (&(t)->thread.tp_value)
107 #define INIT_THREAD { }
109 static inline void start_thread_common(struct pt_regs
*regs
, unsigned long pc
)
111 memset(regs
, 0, sizeof(*regs
));
112 regs
->syscallno
= ~0UL;
116 static inline void start_thread(struct pt_regs
*regs
, unsigned long pc
,
119 start_thread_common(regs
, pc
);
120 regs
->pstate
= PSR_MODE_EL0t
;
125 static inline void compat_start_thread(struct pt_regs
*regs
, unsigned long pc
,
128 start_thread_common(regs
, pc
);
129 regs
->pstate
= COMPAT_PSR_MODE_USR
;
131 regs
->pstate
|= COMPAT_PSR_T_BIT
;
134 regs
->pstate
|= COMPAT_PSR_E_BIT
;
137 regs
->compat_sp
= sp
;
141 /* Forward declaration, a strange C thing */
144 /* Free all resources held by a thread. */
145 extern void release_thread(struct task_struct
*);
147 unsigned long get_wchan(struct task_struct
*p
);
149 static inline void cpu_relax(void)
151 asm volatile("yield" ::: "memory");
154 #define cpu_relax_lowlatency() cpu_relax()
156 /* Thread switching */
157 extern struct task_struct
*cpu_switch_to(struct task_struct
*prev
,
158 struct task_struct
*next
);
160 #define task_pt_regs(p) \
161 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
163 #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc)
164 #define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
167 * Prefetching support
169 #define ARCH_HAS_PREFETCH
170 static inline void prefetch(const void *ptr
)
172 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr
));
175 #define ARCH_HAS_PREFETCHW
176 static inline void prefetchw(const void *ptr
)
178 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr
));
181 #define ARCH_HAS_SPINLOCK_PREFETCH
182 static inline void spin_lock_prefetch(const void *ptr
)
184 asm volatile(ARM64_LSE_ATOMIC_INSN(
185 "prfm pstl1strm, %a0",
186 "nop") : : "p" (ptr
));
189 #define HAVE_ARCH_PICK_MMAP_LAYOUT
193 void cpu_enable_pan(void *__unused
);
194 void cpu_enable_uao(void *__unused
);
196 #endif /* __ASM_PROCESSOR_H */