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/fpsimd.h>
33 #include <asm/hw_breakpoint.h>
34 #include <asm/pgtable-hwdef.h>
35 #include <asm/ptrace.h>
36 #include <asm/types.h>
39 #define STACK_TOP_MAX TASK_SIZE_64
41 #define AARCH32_VECTORS_BASE 0xffff0000
42 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
43 AARCH32_VECTORS_BASE : STACK_TOP_MAX)
45 #define STACK_TOP STACK_TOP_MAX
46 #endif /* CONFIG_COMPAT */
48 #define ARCH_LOW_ADDRESS_LIMIT PHYS_MASK
49 #endif /* __KERNEL__ */
52 /* Have we suspended stepping by a debugger? */
54 /* Allow breakpoints and watchpoints to be disabled for this thread. */
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
];
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 */
87 #define INIT_THREAD { }
89 static inline void start_thread_common(struct pt_regs
*regs
, unsigned long pc
)
91 memset(regs
, 0, sizeof(*regs
));
92 regs
->syscallno
= ~0UL;
96 static inline void start_thread(struct pt_regs
*regs
, unsigned long pc
,
99 start_thread_common(regs
, pc
);
100 regs
->pstate
= PSR_MODE_EL0t
;
105 static inline void compat_start_thread(struct pt_regs
*regs
, unsigned long pc
,
108 start_thread_common(regs
, pc
);
109 regs
->pstate
= COMPAT_PSR_MODE_USR
;
111 regs
->pstate
|= COMPAT_PSR_T_BIT
;
114 regs
->pstate
|= COMPAT_PSR_E_BIT
;
117 regs
->compat_sp
= sp
;
121 /* Forward declaration, a strange C thing */
124 /* Free all resources held by a thread. */
125 extern void release_thread(struct task_struct
*);
127 unsigned long get_wchan(struct task_struct
*p
);
129 #define cpu_relax() barrier()
130 #define cpu_relax_lowlatency() cpu_relax()
132 /* Thread switching */
133 extern struct task_struct
*cpu_switch_to(struct task_struct
*prev
,
134 struct task_struct
*next
);
136 #define task_pt_regs(p) \
137 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
139 #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc)
140 #define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
143 * Prefetching support
145 #define ARCH_HAS_PREFETCH
146 static inline void prefetch(const void *ptr
)
148 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr
));
151 #define ARCH_HAS_PREFETCHW
152 static inline void prefetchw(const void *ptr
)
154 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr
));
157 #define ARCH_HAS_SPINLOCK_PREFETCH
158 static inline void spin_lock_prefetch(const void *x
)
163 #define HAVE_ARCH_PICK_MMAP_LAYOUT
167 #endif /* __ASM_PROCESSOR_H */