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 extern phys_addr_t arm64_dma_phys_limit; 49 #define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1) 50 #endif /* __KERNEL__ */ 51 52 struct debug_info { 53 /* Have we suspended stepping by a debugger? */ 54 int suspended_step; 55 /* Allow breakpoints and watchpoints to be disabled for this thread. */ 56 int bps_disabled; 57 int wps_disabled; 58 /* Hardware breakpoints pinned to this task. */ 59 struct perf_event *hbp_break[ARM_MAX_BRP]; 60 struct perf_event *hbp_watch[ARM_MAX_WRP]; 61 }; 62 63 struct cpu_context { 64 unsigned long x19; 65 unsigned long x20; 66 unsigned long x21; 67 unsigned long x22; 68 unsigned long x23; 69 unsigned long x24; 70 unsigned long x25; 71 unsigned long x26; 72 unsigned long x27; 73 unsigned long x28; 74 unsigned long fp; 75 unsigned long sp; 76 unsigned long pc; 77 }; 78 79 struct thread_struct { 80 struct cpu_context cpu_context; /* cpu context */ 81 unsigned long tp_value; 82 struct fpsimd_state fpsimd_state; 83 unsigned long fault_address; /* fault info */ 84 unsigned long fault_code; /* ESR_EL1 value */ 85 struct debug_info debug; /* debugging */ 86 }; 87 88 #define INIT_THREAD { } 89 90 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc) 91 { 92 memset(regs, 0, sizeof(*regs)); 93 regs->syscallno = ~0UL; 94 regs->pc = pc; 95 } 96 97 static inline void start_thread(struct pt_regs *regs, unsigned long pc, 98 unsigned long sp) 99 { 100 start_thread_common(regs, pc); 101 regs->pstate = PSR_MODE_EL0t; 102 regs->sp = sp; 103 } 104 105 #ifdef CONFIG_COMPAT 106 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc, 107 unsigned long sp) 108 { 109 start_thread_common(regs, pc); 110 regs->pstate = COMPAT_PSR_MODE_USR; 111 if (pc & 1) 112 regs->pstate |= COMPAT_PSR_T_BIT; 113 114 #ifdef __AARCH64EB__ 115 regs->pstate |= COMPAT_PSR_E_BIT; 116 #endif 117 118 regs->compat_sp = sp; 119 } 120 #endif 121 122 /* Forward declaration, a strange C thing */ 123 struct task_struct; 124 125 /* Free all resources held by a thread. */ 126 extern void release_thread(struct task_struct *); 127 128 unsigned long get_wchan(struct task_struct *p); 129 130 #define cpu_relax() barrier() 131 #define cpu_relax_lowlatency() cpu_relax() 132 133 /* Thread switching */ 134 extern struct task_struct *cpu_switch_to(struct task_struct *prev, 135 struct task_struct *next); 136 137 #define task_pt_regs(p) \ 138 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 139 140 #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc) 141 #define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk)) 142 143 /* 144 * Prefetching support 145 */ 146 #define ARCH_HAS_PREFETCH 147 static inline void prefetch(const void *ptr) 148 { 149 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr)); 150 } 151 152 #define ARCH_HAS_PREFETCHW 153 static inline void prefetchw(const void *ptr) 154 { 155 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr)); 156 } 157 158 #define ARCH_HAS_SPINLOCK_PREFETCH 159 static inline void spin_lock_prefetch(const void *x) 160 { 161 prefetchw(x); 162 } 163 164 #define HAVE_ARCH_PICK_MMAP_LAYOUT 165 166 #endif 167 168 #endif /* __ASM_PROCESSOR_H */ 169