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 #define TASK_SIZE_64 (UL(1) << VA_BITS) 23 24 #ifndef __ASSEMBLY__ 25 26 /* 27 * Default implementation of macro that returns current 28 * instruction pointer ("program counter"). 29 */ 30 #define current_text_addr() ({ __label__ _l; _l: &&_l;}) 31 32 #ifdef __KERNEL__ 33 34 #include <linux/string.h> 35 36 #include <asm/alternative.h> 37 #include <asm/fpsimd.h> 38 #include <asm/hw_breakpoint.h> 39 #include <asm/lse.h> 40 #include <asm/pgtable-hwdef.h> 41 #include <asm/ptrace.h> 42 #include <asm/types.h> 43 44 /* 45 * TASK_SIZE - the maximum size of a user space task. 46 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area. 47 */ 48 #ifdef CONFIG_COMPAT 49 #define TASK_SIZE_32 UL(0x100000000) 50 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ 51 TASK_SIZE_32 : TASK_SIZE_64) 52 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ 53 TASK_SIZE_32 : TASK_SIZE_64) 54 #else 55 #define TASK_SIZE TASK_SIZE_64 56 #endif /* CONFIG_COMPAT */ 57 58 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4)) 59 60 #define STACK_TOP_MAX TASK_SIZE_64 61 #ifdef CONFIG_COMPAT 62 #define AARCH32_VECTORS_BASE 0xffff0000 63 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ 64 AARCH32_VECTORS_BASE : STACK_TOP_MAX) 65 #else 66 #define STACK_TOP STACK_TOP_MAX 67 #endif /* CONFIG_COMPAT */ 68 69 extern phys_addr_t arm64_dma_phys_limit; 70 #define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1) 71 72 struct debug_info { 73 #ifdef CONFIG_HAVE_HW_BREAKPOINT 74 /* Have we suspended stepping by a debugger? */ 75 int suspended_step; 76 /* Allow breakpoints and watchpoints to be disabled for this thread. */ 77 int bps_disabled; 78 int wps_disabled; 79 /* Hardware breakpoints pinned to this task. */ 80 struct perf_event *hbp_break[ARM_MAX_BRP]; 81 struct perf_event *hbp_watch[ARM_MAX_WRP]; 82 #endif 83 }; 84 85 struct cpu_context { 86 unsigned long x19; 87 unsigned long x20; 88 unsigned long x21; 89 unsigned long x22; 90 unsigned long x23; 91 unsigned long x24; 92 unsigned long x25; 93 unsigned long x26; 94 unsigned long x27; 95 unsigned long x28; 96 unsigned long fp; 97 unsigned long sp; 98 unsigned long pc; 99 }; 100 101 struct thread_struct { 102 struct cpu_context cpu_context; /* cpu context */ 103 unsigned long tp_value; /* TLS register */ 104 #ifdef CONFIG_COMPAT 105 unsigned long tp2_value; 106 #endif 107 struct fpsimd_state fpsimd_state; 108 void *sve_state; /* SVE registers, if any */ 109 unsigned int sve_vl; /* SVE vector length */ 110 unsigned int sve_vl_onexec; /* SVE vl after next exec */ 111 unsigned long fault_address; /* fault info */ 112 unsigned long fault_code; /* ESR_EL1 value */ 113 struct debug_info debug; /* debugging */ 114 }; 115 116 #ifdef CONFIG_COMPAT 117 #define task_user_tls(t) \ 118 ({ \ 119 unsigned long *__tls; \ 120 if (is_compat_thread(task_thread_info(t))) \ 121 __tls = &(t)->thread.tp2_value; \ 122 else \ 123 __tls = &(t)->thread.tp_value; \ 124 __tls; \ 125 }) 126 #else 127 #define task_user_tls(t) (&(t)->thread.tp_value) 128 #endif 129 130 /* Sync TPIDR_EL0 back to thread_struct for current */ 131 void tls_preserve_current_state(void); 132 133 #define INIT_THREAD { } 134 135 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc) 136 { 137 memset(regs, 0, sizeof(*regs)); 138 forget_syscall(regs); 139 regs->pc = pc; 140 } 141 142 static inline void start_thread(struct pt_regs *regs, unsigned long pc, 143 unsigned long sp) 144 { 145 start_thread_common(regs, pc); 146 regs->pstate = PSR_MODE_EL0t; 147 regs->sp = sp; 148 } 149 150 #ifdef CONFIG_COMPAT 151 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc, 152 unsigned long sp) 153 { 154 start_thread_common(regs, pc); 155 regs->pstate = COMPAT_PSR_MODE_USR; 156 if (pc & 1) 157 regs->pstate |= COMPAT_PSR_T_BIT; 158 159 #ifdef __AARCH64EB__ 160 regs->pstate |= COMPAT_PSR_E_BIT; 161 #endif 162 163 regs->compat_sp = sp; 164 } 165 #endif 166 167 /* Forward declaration, a strange C thing */ 168 struct task_struct; 169 170 /* Free all resources held by a thread. */ 171 extern void release_thread(struct task_struct *); 172 173 unsigned long get_wchan(struct task_struct *p); 174 175 static inline void cpu_relax(void) 176 { 177 asm volatile("yield" ::: "memory"); 178 } 179 180 /* Thread switching */ 181 extern struct task_struct *cpu_switch_to(struct task_struct *prev, 182 struct task_struct *next); 183 184 #define task_pt_regs(p) \ 185 ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1) 186 187 #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc) 188 #define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk)) 189 190 /* 191 * Prefetching support 192 */ 193 #define ARCH_HAS_PREFETCH 194 static inline void prefetch(const void *ptr) 195 { 196 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr)); 197 } 198 199 #define ARCH_HAS_PREFETCHW 200 static inline void prefetchw(const void *ptr) 201 { 202 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr)); 203 } 204 205 #define ARCH_HAS_SPINLOCK_PREFETCH 206 static inline void spin_lock_prefetch(const void *ptr) 207 { 208 asm volatile(ARM64_LSE_ATOMIC_INSN( 209 "prfm pstl1strm, %a0", 210 "nop") : : "p" (ptr)); 211 } 212 213 #define HAVE_ARCH_PICK_MMAP_LAYOUT 214 215 #endif 216 217 int cpu_enable_pan(void *__unused); 218 int cpu_enable_cache_maint_trap(void *__unused); 219 220 /* Userspace interface for PR_SVE_{SET,GET}_VL prctl()s: */ 221 #define SVE_SET_VL(arg) sve_set_current_vl(arg) 222 #define SVE_GET_VL() sve_get_current_vl() 223 224 #endif /* __ASSEMBLY__ */ 225 #endif /* __ASM_PROCESSOR_H */ 226