1 /* 2 * CPU interfaces that are target independent. 3 * 4 * Copyright (c) 2003 Fabrice Bellard 5 * 6 * SPDX-License-Identifier: LGPL-2.1+ 7 */ 8 #ifndef CPU_COMMON_H 9 #define CPU_COMMON_H 10 11 #include "exec/vaddr.h" 12 #include "exec/hwaddr.h" 13 #include "hw/core/cpu.h" 14 #include "tcg/debug-assert.h" 15 #include "exec/page-protection.h" 16 17 #define EXCP_INTERRUPT 0x10000 /* async interruption */ 18 #define EXCP_HLT 0x10001 /* hlt instruction reached */ 19 #define EXCP_DEBUG 0x10002 /* cpu stopped after a breakpoint or singlestep */ 20 #define EXCP_HALTED 0x10003 /* cpu is halted (waiting for external event) */ 21 #define EXCP_YIELD 0x10004 /* cpu wants to yield timeslice to another */ 22 #define EXCP_ATOMIC 0x10005 /* stop-the-world and emulate atomic */ 23 24 void cpu_exec_init_all(void); 25 void cpu_exec_step_atomic(CPUState *cpu); 26 27 #define REAL_HOST_PAGE_ALIGN(addr) ROUND_UP((addr), qemu_real_host_page_size()) 28 29 /* The CPU list lock nests outside page_(un)lock or mmap_(un)lock */ 30 extern QemuMutex qemu_cpu_list_lock; 31 void qemu_init_cpu_list(void); 32 void cpu_list_lock(void); 33 void cpu_list_unlock(void); 34 unsigned int cpu_list_generation_id_get(void); 35 36 int cpu_get_free_index(void); 37 38 void tcg_iommu_init_notifier_list(CPUState *cpu); 39 void tcg_iommu_free_notifier_list(CPUState *cpu); 40 41 enum device_endian { 42 DEVICE_NATIVE_ENDIAN, 43 DEVICE_BIG_ENDIAN, 44 DEVICE_LITTLE_ENDIAN, 45 }; 46 47 /* address in the RAM (different from a physical address) */ 48 #if defined(CONFIG_XEN_BACKEND) 49 typedef uint64_t ram_addr_t; 50 # define RAM_ADDR_MAX UINT64_MAX 51 # define RAM_ADDR_FMT "%" PRIx64 52 #else 53 typedef uintptr_t ram_addr_t; 54 # define RAM_ADDR_MAX UINTPTR_MAX 55 # define RAM_ADDR_FMT "%" PRIxPTR 56 #endif 57 58 /* memory API */ 59 60 void qemu_ram_remap(ram_addr_t addr); 61 /* This should not be used by devices. */ 62 ram_addr_t qemu_ram_addr_from_host(void *ptr); 63 ram_addr_t qemu_ram_addr_from_host_nofail(void *ptr); 64 RAMBlock *qemu_ram_block_by_name(const char *name); 65 66 /* 67 * Translates a host ptr back to a RAMBlock and an offset in that RAMBlock. 68 * 69 * @ptr: The host pointer to translate. 70 * @round_offset: Whether to round the result offset down to a target page 71 * @offset: Will be set to the offset within the returned RAMBlock. 72 * 73 * Returns: RAMBlock (or NULL if not found) 74 * 75 * By the time this function returns, the returned pointer is not protected 76 * by RCU anymore. If the caller is not within an RCU critical section and 77 * does not hold the BQL, it must have other means of protecting the 78 * pointer, such as a reference to the memory region that owns the RAMBlock. 79 */ 80 RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset, 81 ram_addr_t *offset); 82 ram_addr_t qemu_ram_block_host_offset(RAMBlock *rb, void *host); 83 void qemu_ram_set_idstr(RAMBlock *block, const char *name, DeviceState *dev); 84 void qemu_ram_unset_idstr(RAMBlock *block); 85 const char *qemu_ram_get_idstr(RAMBlock *rb); 86 void *qemu_ram_get_host_addr(RAMBlock *rb); 87 ram_addr_t qemu_ram_get_offset(RAMBlock *rb); 88 ram_addr_t qemu_ram_get_fd_offset(RAMBlock *rb); 89 ram_addr_t qemu_ram_get_used_length(RAMBlock *rb); 90 ram_addr_t qemu_ram_get_max_length(RAMBlock *rb); 91 bool qemu_ram_is_shared(RAMBlock *rb); 92 bool qemu_ram_is_noreserve(RAMBlock *rb); 93 bool qemu_ram_is_uf_zeroable(RAMBlock *rb); 94 void qemu_ram_set_uf_zeroable(RAMBlock *rb); 95 bool qemu_ram_is_migratable(RAMBlock *rb); 96 void qemu_ram_set_migratable(RAMBlock *rb); 97 void qemu_ram_unset_migratable(RAMBlock *rb); 98 bool qemu_ram_is_named_file(RAMBlock *rb); 99 int qemu_ram_get_fd(RAMBlock *rb); 100 101 size_t qemu_ram_pagesize(RAMBlock *block); 102 size_t qemu_ram_pagesize_largest(void); 103 104 /** 105 * cpu_address_space_init: 106 * @cpu: CPU to add this address space to 107 * @asidx: integer index of this address space 108 * @prefix: prefix to be used as name of address space 109 * @mr: the root memory region of address space 110 * 111 * Add the specified address space to the CPU's cpu_ases list. 112 * The address space added with @asidx 0 is the one used for the 113 * convenience pointer cpu->as. 114 * The target-specific code which registers ASes is responsible 115 * for defining what semantics address space 0, 1, 2, etc have. 116 * 117 * Before the first call to this function, the caller must set 118 * cpu->num_ases to the total number of address spaces it needs 119 * to support. 120 * 121 * Note that with KVM only one address space is supported. 122 */ 123 void cpu_address_space_init(CPUState *cpu, int asidx, 124 const char *prefix, MemoryRegion *mr); 125 /** 126 * cpu_destroy_address_spaces: 127 * @cpu: CPU for which address spaces need to be destroyed 128 * 129 * Destroy all address spaces associated with this CPU; this 130 * is called as part of unrealizing the CPU. 131 */ 132 void cpu_destroy_address_spaces(CPUState *cpu); 133 134 void cpu_physical_memory_read(hwaddr addr, void *buf, hwaddr len); 135 void cpu_physical_memory_write(hwaddr addr, const void *buf, hwaddr len); 136 void *cpu_physical_memory_map(hwaddr addr, 137 hwaddr *plen, 138 bool is_write); 139 void cpu_physical_memory_unmap(void *buffer, hwaddr len, 140 bool is_write, hwaddr access_len); 141 142 /* Coalesced MMIO regions are areas where write operations can be reordered. 143 * This usually implies that write operations are side-effect free. This allows 144 * batching which can make a major impact on performance when using 145 * virtualization. 146 */ 147 void qemu_flush_coalesced_mmio_buffer(void); 148 149 typedef int (RAMBlockIterFunc)(RAMBlock *rb, void *opaque); 150 151 int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque); 152 153 /* vl.c */ 154 void list_cpus(void); 155 156 #ifdef CONFIG_TCG 157 #include "qemu/atomic.h" 158 159 /** 160 * cpu_unwind_state_data: 161 * @cpu: the cpu context 162 * @host_pc: the host pc within the translation 163 * @data: output data 164 * 165 * Attempt to load the unwind state for a host pc occurring in 166 * translated code. If @host_pc is not in translated code, the 167 * function returns false; otherwise @data is loaded. 168 * This is the same unwind info as given to restore_state_to_opc. 169 */ 170 bool cpu_unwind_state_data(CPUState *cpu, uintptr_t host_pc, uint64_t *data); 171 172 /** 173 * cpu_restore_state: 174 * @cpu: the cpu context 175 * @host_pc: the host pc within the translation 176 * @return: true if state was restored, false otherwise 177 * 178 * Attempt to restore the state for a fault occurring in translated 179 * code. If @host_pc is not in translated code no state is 180 * restored and the function returns false. 181 */ 182 bool cpu_restore_state(CPUState *cpu, uintptr_t host_pc); 183 184 /** 185 * cpu_loop_exit_requested: 186 * @cpu: The CPU state to be tested 187 * 188 * Indicate if somebody asked for a return of the CPU to the main loop 189 * (e.g., via cpu_exit() or cpu_interrupt()). 190 * 191 * This is helpful for architectures that support interruptible 192 * instructions. After writing back all state to registers/memory, this 193 * call can be used to check if it makes sense to return to the main loop 194 * or to continue executing the interruptible instruction. 195 */ 196 static inline bool cpu_loop_exit_requested(CPUState *cpu) 197 { 198 return (int32_t)qatomic_read(&cpu->neg.icount_decr.u32) < 0; 199 } 200 201 G_NORETURN void cpu_loop_exit_noexc(CPUState *cpu); 202 G_NORETURN void cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc); 203 G_NORETURN void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc); 204 #endif /* CONFIG_TCG */ 205 G_NORETURN void cpu_loop_exit(CPUState *cpu); 206 207 /* accel/tcg/cpu-exec.c */ 208 int cpu_exec(CPUState *cpu); 209 210 /** 211 * env_archcpu(env) 212 * @env: The architecture environment 213 * 214 * Return the ArchCPU associated with the environment. 215 */ 216 static inline ArchCPU *env_archcpu(CPUArchState *env) 217 { 218 return (void *)env - sizeof(CPUState); 219 } 220 221 /** 222 * env_cpu_const(env) 223 * @env: The architecture environment 224 * 225 * Return the CPUState associated with the environment. 226 */ 227 static inline const CPUState *env_cpu_const(const CPUArchState *env) 228 { 229 return (void *)env - sizeof(CPUState); 230 } 231 232 /** 233 * env_cpu(env) 234 * @env: The architecture environment 235 * 236 * Return the CPUState associated with the environment. 237 */ 238 static inline CPUState *env_cpu(CPUArchState *env) 239 { 240 return (CPUState *)env_cpu_const(env); 241 } 242 243 #endif /* CPU_COMMON_H */ 244