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 */
46 #endif /* __KERNEL__ */
49 /* Have we suspended stepping by a debugger? */
51 /* Allow breakpoints and watchpoints to be disabled for this thread. */
54 /* Hardware breakpoints pinned to this task. */
55 struct perf_event *hbp_break[ARM_MAX_BRP];
56 struct perf_event *hbp_watch[ARM_MAX_WRP];
75 struct thread_struct {
76 struct cpu_context cpu_context; /* cpu context */
77 unsigned long tp_value;
78 struct fpsimd_state fpsimd_state;
79 unsigned long fault_address; /* fault info */
80 struct debug_info debug; /* debugging */
83 #define INIT_THREAD { }
85 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
87 memset(regs, 0, sizeof(*regs));
88 regs->syscallno = ~0UL;
92 static inline void start_thread(struct pt_regs *regs, unsigned long pc,
95 unsigned long *stack = (unsigned long *)sp;
97 start_thread_common(regs, pc);
98 regs->pstate = PSR_MODE_EL0t;
100 regs->regs[2] = stack[2]; /* x2 (envp) */
101 regs->regs[1] = stack[1]; /* x1 (argv) */
102 regs->regs[0] = stack[0]; /* x0 (argc) */
106 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
109 unsigned int *stack = (unsigned int *)sp;
111 start_thread_common(regs, pc);
112 regs->pstate = COMPAT_PSR_MODE_USR;
114 regs->pstate |= COMPAT_PSR_T_BIT;
115 regs->compat_sp = sp;
116 regs->regs[2] = stack[2]; /* x2 (envp) */
117 regs->regs[1] = stack[1]; /* x1 (argv) */
118 regs->regs[0] = stack[0]; /* x0 (argc) */
122 /* Forward declaration, a strange C thing */
125 /* Free all resources held by a thread. */
126 extern void release_thread(struct task_struct *);
128 /* Prepare to copy thread state - unlazy all lazy status */
129 #define prepare_to_copy(tsk) do { } while (0)
131 unsigned long get_wchan(struct task_struct *p);
133 #define cpu_relax() barrier()
135 /* Thread switching */
136 extern struct task_struct *cpu_switch_to(struct task_struct *prev,
137 struct task_struct *next);
140 * Create a new kernel thread
142 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
144 #define task_pt_regs(p) \
145 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
147 #define KSTK_EIP(tsk) task_pt_regs(tsk)->pc
148 #define KSTK_ESP(tsk) task_pt_regs(tsk)->sp
151 * Prefetching support
153 #define ARCH_HAS_PREFETCH
154 static inline void prefetch(const void *ptr)
156 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr));
159 #define ARCH_HAS_PREFETCHW
160 static inline void prefetchw(const void *ptr)
162 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr));
165 #define ARCH_HAS_SPINLOCK_PREFETCH
166 static inline void spin_lock_prefetch(const void *x)
171 #define HAVE_ARCH_PICK_MMAP_LAYOUT
175 #endif /* __ASM_PROCESSOR_H */