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 /* 23 * Default implementation of macro that returns current 24 * instruction pointer ("program counter"). 25 */ 26 #define current_text_addr() ({ __label__ _l; _l: &&_l;}) 27 28 #ifdef __KERNEL__ 29 30 #include <linux/string.h> 31 32 #include <asm/fpsimd.h> 33 #include <asm/hw_breakpoint.h> 34 #include <asm/ptrace.h> 35 #include <asm/types.h> 36 37 #ifdef __KERNEL__ 38 #define STACK_TOP_MAX TASK_SIZE_64 39 #ifdef CONFIG_COMPAT 40 #define AARCH32_VECTORS_BASE 0xffff0000 41 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ 42 AARCH32_VECTORS_BASE : STACK_TOP_MAX) 43 #else 44 #define STACK_TOP STACK_TOP_MAX 45 #endif /* CONFIG_COMPAT */ 46 #endif /* __KERNEL__ */ 47 48 struct debug_info { 49 /* Have we suspended stepping by a debugger? */ 50 int suspended_step; 51 /* Allow breakpoints and watchpoints to be disabled for this thread. */ 52 int bps_disabled; 53 int wps_disabled; 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]; 57 }; 58 59 struct cpu_context { 60 unsigned long x19; 61 unsigned long x20; 62 unsigned long x21; 63 unsigned long x22; 64 unsigned long x23; 65 unsigned long x24; 66 unsigned long x25; 67 unsigned long x26; 68 unsigned long x27; 69 unsigned long x28; 70 unsigned long fp; 71 unsigned long sp; 72 unsigned long pc; 73 }; 74 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 */ 81 }; 82 83 #define INIT_THREAD { } 84 85 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc) 86 { 87 memset(regs, 0, sizeof(*regs)); 88 regs->syscallno = ~0UL; 89 regs->pc = pc; 90 } 91 92 static inline void start_thread(struct pt_regs *regs, unsigned long pc, 93 unsigned long sp) 94 { 95 start_thread_common(regs, pc); 96 regs->pstate = PSR_MODE_EL0t; 97 regs->sp = sp; 98 } 99 100 #ifdef CONFIG_COMPAT 101 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc, 102 unsigned long sp) 103 { 104 start_thread_common(regs, pc); 105 regs->pstate = COMPAT_PSR_MODE_USR; 106 if (pc & 1) 107 regs->pstate |= COMPAT_PSR_T_BIT; 108 regs->compat_sp = sp; 109 } 110 #endif 111 112 /* Forward declaration, a strange C thing */ 113 struct task_struct; 114 115 /* Free all resources held by a thread. */ 116 extern void release_thread(struct task_struct *); 117 118 /* Prepare to copy thread state - unlazy all lazy status */ 119 #define prepare_to_copy(tsk) do { } while (0) 120 121 unsigned long get_wchan(struct task_struct *p); 122 123 #define cpu_relax() barrier() 124 125 /* Thread switching */ 126 extern struct task_struct *cpu_switch_to(struct task_struct *prev, 127 struct task_struct *next); 128 129 /* 130 * Create a new kernel thread 131 */ 132 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 133 134 #define task_pt_regs(p) \ 135 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 136 137 #define KSTK_EIP(tsk) task_pt_regs(tsk)->pc 138 #define KSTK_ESP(tsk) task_pt_regs(tsk)->sp 139 140 /* 141 * Prefetching support 142 */ 143 #define ARCH_HAS_PREFETCH 144 static inline void prefetch(const void *ptr) 145 { 146 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr)); 147 } 148 149 #define ARCH_HAS_PREFETCHW 150 static inline void prefetchw(const void *ptr) 151 { 152 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr)); 153 } 154 155 #define ARCH_HAS_SPINLOCK_PREFETCH 156 static inline void spin_lock_prefetch(const void *x) 157 { 158 prefetchw(x); 159 } 160 161 #define HAVE_ARCH_PICK_MMAP_LAYOUT 162 163 #endif 164 165 #endif /* __ASM_PROCESSOR_H */ 166