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/pgtable-hwdef.h> 35 #include <asm/ptrace.h> 36 #include <asm/types.h> 37 38 #ifdef __KERNEL__ 39 #define STACK_TOP_MAX TASK_SIZE_64 40 #ifdef CONFIG_COMPAT 41 #define AARCH32_VECTORS_BASE 0xffff0000 42 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ 43 AARCH32_VECTORS_BASE : STACK_TOP_MAX) 44 #else 45 #define STACK_TOP STACK_TOP_MAX 46 #endif /* CONFIG_COMPAT */ 47 48 #define ARCH_LOW_ADDRESS_LIMIT PHYS_MASK 49 #endif /* __KERNEL__ */ 50 51 struct debug_info { 52 /* Have we suspended stepping by a debugger? */ 53 int suspended_step; 54 /* Allow breakpoints and watchpoints to be disabled for this thread. */ 55 int bps_disabled; 56 int wps_disabled; 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]; 60 }; 61 62 struct cpu_context { 63 unsigned long x19; 64 unsigned long x20; 65 unsigned long x21; 66 unsigned long x22; 67 unsigned long x23; 68 unsigned long x24; 69 unsigned long x25; 70 unsigned long x26; 71 unsigned long x27; 72 unsigned long x28; 73 unsigned long fp; 74 unsigned long sp; 75 unsigned long pc; 76 }; 77 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 */ 85 }; 86 87 #define INIT_THREAD { } 88 89 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc) 90 { 91 memset(regs, 0, sizeof(*regs)); 92 regs->syscallno = ~0UL; 93 regs->pc = pc; 94 } 95 96 static inline void start_thread(struct pt_regs *regs, unsigned long pc, 97 unsigned long sp) 98 { 99 start_thread_common(regs, pc); 100 regs->pstate = PSR_MODE_EL0t; 101 regs->sp = sp; 102 } 103 104 #ifdef CONFIG_COMPAT 105 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc, 106 unsigned long sp) 107 { 108 start_thread_common(regs, pc); 109 regs->pstate = COMPAT_PSR_MODE_USR; 110 if (pc & 1) 111 regs->pstate |= COMPAT_PSR_T_BIT; 112 113 #ifdef __AARCH64EB__ 114 regs->pstate |= COMPAT_PSR_E_BIT; 115 #endif 116 117 regs->compat_sp = sp; 118 } 119 #endif 120 121 /* Forward declaration, a strange C thing */ 122 struct task_struct; 123 124 /* Free all resources held by a thread. */ 125 extern void release_thread(struct task_struct *); 126 127 unsigned long get_wchan(struct task_struct *p); 128 129 #define cpu_relax() barrier() 130 #define cpu_relax_lowlatency() cpu_relax() 131 132 /* Thread switching */ 133 extern struct task_struct *cpu_switch_to(struct task_struct *prev, 134 struct task_struct *next); 135 136 #define task_pt_regs(p) \ 137 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 138 139 #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc) 140 #define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk)) 141 142 /* 143 * Prefetching support 144 */ 145 #define ARCH_HAS_PREFETCH 146 static inline void prefetch(const void *ptr) 147 { 148 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr)); 149 } 150 151 #define ARCH_HAS_PREFETCHW 152 static inline void prefetchw(const void *ptr) 153 { 154 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr)); 155 } 156 157 #define ARCH_HAS_SPINLOCK_PREFETCH 158 static inline void spin_lock_prefetch(const void *x) 159 { 160 prefetchw(x); 161 } 162 163 #define HAVE_ARCH_PICK_MMAP_LAYOUT 164 165 #endif 166 167 #endif /* __ASM_PROCESSOR_H */ 168