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/ptrace.h>
35 #include <asm/types.h>
38 #define STACK_TOP_MAX TASK_SIZE_64
40 #define AARCH32_VECTORS_BASE 0xffff0000
41 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
42 AARCH32_VECTORS_BASE : STACK_TOP_MAX)
44 #define STACK_TOP STACK_TOP_MAX
45 #endif /* CONFIG_COMPAT */
47 #define ARCH_LOW_ADDRESS_LIMIT PHYS_MASK
48 #endif /* __KERNEL__ */
51 /* Have we suspended stepping by a debugger? */
53 /* Allow breakpoints and watchpoints to be disabled for this thread. */
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];
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 */
85 #define INIT_THREAD { }
87 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
89 memset(regs, 0, sizeof(*regs));
90 regs->syscallno = ~0UL;
94 static inline void start_thread(struct pt_regs *regs, unsigned long pc,
97 start_thread_common(regs, pc);
98 regs->pstate = PSR_MODE_EL0t;
103 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
106 start_thread_common(regs, pc);
107 regs->pstate = COMPAT_PSR_MODE_USR;
109 regs->pstate |= COMPAT_PSR_T_BIT;
110 regs->compat_sp = sp;
114 /* Forward declaration, a strange C thing */
117 /* Free all resources held by a thread. */
118 extern void release_thread(struct task_struct *);
120 /* Prepare to copy thread state - unlazy all lazy status */
121 #define prepare_to_copy(tsk) do { } while (0)
123 unsigned long get_wchan(struct task_struct *p);
125 #define cpu_relax() barrier()
127 /* Thread switching */
128 extern struct task_struct *cpu_switch_to(struct task_struct *prev,
129 struct task_struct *next);
131 #define task_pt_regs(p) \
132 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
134 #define KSTK_EIP(tsk) task_pt_regs(tsk)->pc
135 #define KSTK_ESP(tsk) task_pt_regs(tsk)->sp
138 * Prefetching support
140 #define ARCH_HAS_PREFETCH
141 static inline void prefetch(const void *ptr)
143 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr));
146 #define ARCH_HAS_PREFETCHW
147 static inline void prefetchw(const void *ptr)
149 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr));
152 #define ARCH_HAS_SPINLOCK_PREFETCH
153 static inline void spin_lock_prefetch(const void *x)
158 #define HAVE_ARCH_PICK_MMAP_LAYOUT
162 #endif /* __ASM_PROCESSOR_H */