include/exec/cpu-common.h - qemu - Git at Google

 /*
  * CPU interfaces that are target independent.
  *
  *  Copyright (c) 2003 Fabrice Bellard
  *
  * SPDX-License-Identifier: LGPL-2.1+
  */
 #ifndef CPU_COMMON_H
 #define CPU_COMMON_H

 #include "exec/vaddr.h"
 #ifndef CONFIG_USER_ONLY
 #include "exec/hwaddr.h"
 #endif
 #include "hw/core/cpu.h"
 #include "tcg/debug-assert.h"
 #include "exec/page-protection.h"

 #define EXCP_INTERRUPT  0x10000 /* async interruption */
 #define EXCP_HLT        0x10001 /* hlt instruction reached */
 #define EXCP_DEBUG      0x10002 /* cpu stopped after a breakpoint or singlestep */
 #define EXCP_HALTED     0x10003 /* cpu is halted (waiting for external event) */
 #define EXCP_YIELD      0x10004 /* cpu wants to yield timeslice to another */
 #define EXCP_ATOMIC     0x10005 /* stop-the-world and emulate atomic */

 void cpu_exec_init_all(void);
 void cpu_exec_step_atomic(CPUState *cpu);

 #define REAL_HOST_PAGE_ALIGN(addr) ROUND_UP((addr), qemu_real_host_page_size())

 /* The CPU list lock nests outside page_(un)lock or mmap_(un)lock */
 extern QemuMutex qemu_cpu_list_lock;
 void qemu_init_cpu_list(void);
 void cpu_list_lock(void);
 void cpu_list_unlock(void);
 unsigned int cpu_list_generation_id_get(void);

 int cpu_get_free_index(void);

 void tcg_iommu_init_notifier_list(CPUState *cpu);
 void tcg_iommu_free_notifier_list(CPUState *cpu);

 #if !defined(CONFIG_USER_ONLY)

 enum device_endian {
     DEVICE_NATIVE_ENDIAN,
     DEVICE_BIG_ENDIAN,
     DEVICE_LITTLE_ENDIAN,
 };

 #if HOST_BIG_ENDIAN
 #define DEVICE_HOST_ENDIAN DEVICE_BIG_ENDIAN
 #else
 #define DEVICE_HOST_ENDIAN DEVICE_LITTLE_ENDIAN
 #endif

 /* address in the RAM (different from a physical address) */
 #if defined(CONFIG_XEN_BACKEND)
 typedef uint64_t ram_addr_t;
 #  define RAM_ADDR_MAX UINT64_MAX
 #  define RAM_ADDR_FMT "%" PRIx64
 #else
 typedef uintptr_t ram_addr_t;
 #  define RAM_ADDR_MAX UINTPTR_MAX
 #  define RAM_ADDR_FMT "%" PRIxPTR
 #endif

 /* memory API */

 void qemu_ram_remap(ram_addr_t addr, ram_addr_t length);
 /* This should not be used by devices.  */
 ram_addr_t qemu_ram_addr_from_host(void *ptr);
 ram_addr_t qemu_ram_addr_from_host_nofail(void *ptr);
 RAMBlock *qemu_ram_block_by_name(const char *name);

 /*
  * Translates a host ptr back to a RAMBlock and an offset in that RAMBlock.
  *
  * @ptr: The host pointer to translate.
  * @round_offset: Whether to round the result offset down to a target page
  * @offset: Will be set to the offset within the returned RAMBlock.
  *
  * Returns: RAMBlock (or NULL if not found)
  *
  * By the time this function returns, the returned pointer is not protected
  * by RCU anymore.  If the caller is not within an RCU critical section and
  * does not hold the BQL, it must have other means of protecting the
  * pointer, such as a reference to the memory region that owns the RAMBlock.
  */
 RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
                                    ram_addr_t *offset);
 ram_addr_t qemu_ram_block_host_offset(RAMBlock *rb, void *host);
 void qemu_ram_set_idstr(RAMBlock *block, const char *name, DeviceState *dev);
 void qemu_ram_unset_idstr(RAMBlock *block);
 const char *qemu_ram_get_idstr(RAMBlock *rb);
 void *qemu_ram_get_host_addr(RAMBlock *rb);
 ram_addr_t qemu_ram_get_offset(RAMBlock *rb);
 ram_addr_t qemu_ram_get_used_length(RAMBlock *rb);
 ram_addr_t qemu_ram_get_max_length(RAMBlock *rb);
 bool qemu_ram_is_shared(RAMBlock *rb);
 bool qemu_ram_is_noreserve(RAMBlock *rb);
 bool qemu_ram_is_uf_zeroable(RAMBlock *rb);
 void qemu_ram_set_uf_zeroable(RAMBlock *rb);
 bool qemu_ram_is_migratable(RAMBlock *rb);
 void qemu_ram_set_migratable(RAMBlock *rb);
 void qemu_ram_unset_migratable(RAMBlock *rb);
 bool qemu_ram_is_named_file(RAMBlock *rb);
 int qemu_ram_get_fd(RAMBlock *rb);

 size_t qemu_ram_pagesize(RAMBlock *block);
 size_t qemu_ram_pagesize_largest(void);

 /**
  * cpu_address_space_init:
  * @cpu: CPU to add this address space to
  * @asidx: integer index of this address space
  * @prefix: prefix to be used as name of address space
  * @mr: the root memory region of address space
  *
  * Add the specified address space to the CPU's cpu_ases list.
  * The address space added with @asidx 0 is the one used for the
  * convenience pointer cpu->as.
  * The target-specific code which registers ASes is responsible
  * for defining what semantics address space 0, 1, 2, etc have.
  *
  * Before the first call to this function, the caller must set
  * cpu->num_ases to the total number of address spaces it needs
  * to support.
  *
  * Note that with KVM only one address space is supported.
  */
 void cpu_address_space_init(CPUState *cpu, int asidx,
                             const char *prefix, MemoryRegion *mr);
 /**
  * cpu_address_space_destroy:
  * @cpu: CPU for which address space needs to be destroyed
  * @asidx: integer index of this address space
  *
  * Note that with KVM only one address space is supported.
  */
 void cpu_address_space_destroy(CPUState *cpu, int asidx);

 void cpu_physical_memory_rw(hwaddr addr, void *buf,
                             hwaddr len, bool is_write);
 static inline void cpu_physical_memory_read(hwaddr addr,
                                             void *buf, hwaddr len)
 {
     cpu_physical_memory_rw(addr, buf, len, false);
 }
 static inline void cpu_physical_memory_write(hwaddr addr,
                                              const void *buf, hwaddr len)
 {
     cpu_physical_memory_rw(addr, (void *)buf, len, true);
 }
 void *cpu_physical_memory_map(hwaddr addr,
                               hwaddr *plen,
                               bool is_write);
 void cpu_physical_memory_unmap(void *buffer, hwaddr len,
                                bool is_write, hwaddr access_len);

 bool cpu_physical_memory_is_io(hwaddr phys_addr);

 /* Coalesced MMIO regions are areas where write operations can be reordered.
  * This usually implies that write operations are side-effect free.  This allows
  * batching which can make a major impact on performance when using
  * virtualization.
  */
 void qemu_flush_coalesced_mmio_buffer(void);

 void cpu_flush_icache_range(hwaddr start, hwaddr len);

 typedef int (RAMBlockIterFunc)(RAMBlock *rb, void *opaque);

 int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque);
 int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length);
 int ram_block_discard_guest_memfd_range(RAMBlock *rb, uint64_t start,
                                         size_t length);

 #endif

 /* Returns: 0 on success, -1 on error */
 int cpu_memory_rw_debug(CPUState *cpu, vaddr addr,
                         void *ptr, size_t len, bool is_write);

 /* vl.c */
 void list_cpus(void);

 #ifdef CONFIG_TCG

 bool tcg_cflags_has(CPUState *cpu, uint32_t flags);
 void tcg_cflags_set(CPUState *cpu, uint32_t flags);

 /* current cflags for hashing/comparison */
 uint32_t curr_cflags(CPUState *cpu);

 /**
  * cpu_unwind_state_data:
  * @cpu: the cpu context
  * @host_pc: the host pc within the translation
  * @data: output data
  *
  * Attempt to load the the unwind state for a host pc occurring in
  * translated code.  If @host_pc is not in translated code, the
  * function returns false; otherwise @data is loaded.
  * This is the same unwind info as given to restore_state_to_opc.
  */
 bool cpu_unwind_state_data(CPUState *cpu, uintptr_t host_pc, uint64_t *data);

 /**
  * cpu_restore_state:
  * @cpu: the cpu context
  * @host_pc: the host pc within the translation
  * @return: true if state was restored, false otherwise
  *
  * Attempt to restore the state for a fault occurring in translated
  * code. If @host_pc is not in translated code no state is
  * restored and the function returns false.
  */
 bool cpu_restore_state(CPUState *cpu, uintptr_t host_pc);

 G_NORETURN void cpu_loop_exit_noexc(CPUState *cpu);
 G_NORETURN void cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc);
 #endif /* CONFIG_TCG */
 G_NORETURN void cpu_loop_exit(CPUState *cpu);
 G_NORETURN void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc);

 /* accel/tcg/cpu-exec.c */
 int cpu_exec(CPUState *cpu);

 /**
  * env_archcpu(env)
  * @env: The architecture environment
  *
  * Return the ArchCPU associated with the environment.
  */
 static inline ArchCPU *env_archcpu(CPUArchState *env)
 {
     return (void *)env - sizeof(CPUState);
 }

 /**
  * env_cpu(env)
  * @env: The architecture environment
  *
  * Return the CPUState associated with the environment.
  */
 static inline CPUState *env_cpu(CPUArchState *env)
 {
     return (void *)env - sizeof(CPUState);
 }

 #ifndef CONFIG_USER_ONLY
 /**
  * cpu_mmu_index:
  * @env: The cpu environment
  * @ifetch: True for code access, false for data access.
  *
  * Return the core mmu index for the current translation regime.
  * This function is used by generic TCG code paths.
  *
  * The user-only version of this function is inline in cpu-all.h,
  * where it always returns MMU_USER_IDX.
  */
 static inline int cpu_mmu_index(CPUState *cs, bool ifetch)
 {
     int ret = cs->cc->mmu_index(cs, ifetch);
     tcg_debug_assert(ret >= 0 && ret < NB_MMU_MODES);
     return ret;
 }
 #endif /* !CONFIG_USER_ONLY */

 #endif /* CPU_COMMON_H */
	/*
	* CPU interfaces that are target independent.
	*
	* Copyright (c) 2003 Fabrice Bellard
	*
	* SPDX-License-Identifier: LGPL-2.1+
	*/
	#ifndef CPU_COMMON_H
	#define CPU_COMMON_H

	#include "exec/vaddr.h"
	#ifndef CONFIG_USER_ONLY
	#include "exec/hwaddr.h"
	#endif
	#include "hw/core/cpu.h"
	#include "tcg/debug-assert.h"
	#include "exec/page-protection.h"

	#define EXCP_INTERRUPT 0x10000 /* async interruption */
	#define EXCP_HLT 0x10001 /* hlt instruction reached */
	#define EXCP_DEBUG 0x10002 /* cpu stopped after a breakpoint or singlestep */
	#define EXCP_HALTED 0x10003 /* cpu is halted (waiting for external event) */
	#define EXCP_YIELD 0x10004 /* cpu wants to yield timeslice to another */
	#define EXCP_ATOMIC 0x10005 /* stop-the-world and emulate atomic */

	void cpu_exec_init_all(void);
	void cpu_exec_step_atomic(CPUState *cpu);

	#define REAL_HOST_PAGE_ALIGN(addr) ROUND_UP((addr), qemu_real_host_page_size())

	/* The CPU list lock nests outside page_(un)lock or mmap_(un)lock */
	extern QemuMutex qemu_cpu_list_lock;
	void qemu_init_cpu_list(void);
	void cpu_list_lock(void);
	void cpu_list_unlock(void);
	unsigned int cpu_list_generation_id_get(void);

	int cpu_get_free_index(void);

	void tcg_iommu_init_notifier_list(CPUState *cpu);
	void tcg_iommu_free_notifier_list(CPUState *cpu);

	#if !defined(CONFIG_USER_ONLY)

	enum device_endian {
	DEVICE_NATIVE_ENDIAN,
	DEVICE_BIG_ENDIAN,
	DEVICE_LITTLE_ENDIAN,
	};

	#if HOST_BIG_ENDIAN
	#define DEVICE_HOST_ENDIAN DEVICE_BIG_ENDIAN
	#else
	#define DEVICE_HOST_ENDIAN DEVICE_LITTLE_ENDIAN
	#endif

	/* address in the RAM (different from a physical address) */
	#if defined(CONFIG_XEN_BACKEND)
	typedef uint64_t ram_addr_t;
	# define RAM_ADDR_MAX UINT64_MAX
	# define RAM_ADDR_FMT "%" PRIx64
	#else
	typedef uintptr_t ram_addr_t;
	# define RAM_ADDR_MAX UINTPTR_MAX
	# define RAM_ADDR_FMT "%" PRIxPTR
	#endif

	/* memory API */

	void qemu_ram_remap(ram_addr_t addr, ram_addr_t length);
	/* This should not be used by devices. */
	ram_addr_t qemu_ram_addr_from_host(void *ptr);
	ram_addr_t qemu_ram_addr_from_host_nofail(void *ptr);
	RAMBlock qemu_ram_block_by_name(const char name);

	/*
	* Translates a host ptr back to a RAMBlock and an offset in that RAMBlock.
	*
	* @ptr: The host pointer to translate.
	* @round_offset: Whether to round the result offset down to a target page
	* @offset: Will be set to the offset within the returned RAMBlock.
	*
	* Returns: RAMBlock (or NULL if not found)
	*
	* By the time this function returns, the returned pointer is not protected
	* by RCU anymore. If the caller is not within an RCU critical section and
	* does not hold the BQL, it must have other means of protecting the
	* pointer, such as a reference to the memory region that owns the RAMBlock.
	*/
	RAMBlock qemu_ram_block_from_host(void ptr, bool round_offset,
	ram_addr_t *offset);
	ram_addr_t qemu_ram_block_host_offset(RAMBlock rb, void host);
	void qemu_ram_set_idstr(RAMBlock block, const char name, DeviceState *dev);
	void qemu_ram_unset_idstr(RAMBlock *block);
	const char qemu_ram_get_idstr(RAMBlock rb);
	void qemu_ram_get_host_addr(RAMBlock rb);
	ram_addr_t qemu_ram_get_offset(RAMBlock *rb);
	ram_addr_t qemu_ram_get_used_length(RAMBlock *rb);
	ram_addr_t qemu_ram_get_max_length(RAMBlock *rb);
	bool qemu_ram_is_shared(RAMBlock *rb);
	bool qemu_ram_is_noreserve(RAMBlock *rb);
	bool qemu_ram_is_uf_zeroable(RAMBlock *rb);
	void qemu_ram_set_uf_zeroable(RAMBlock *rb);
	bool qemu_ram_is_migratable(RAMBlock *rb);
	void qemu_ram_set_migratable(RAMBlock *rb);
	void qemu_ram_unset_migratable(RAMBlock *rb);
	bool qemu_ram_is_named_file(RAMBlock *rb);
	int qemu_ram_get_fd(RAMBlock *rb);

	size_t qemu_ram_pagesize(RAMBlock *block);
	size_t qemu_ram_pagesize_largest(void);

	/**
	* cpu_address_space_init:
	* @cpu: CPU to add this address space to
	* @asidx: integer index of this address space
	* @prefix: prefix to be used as name of address space
	* @mr: the root memory region of address space
	*
	* Add the specified address space to the CPU's cpu_ases list.
	* The address space added with @asidx 0 is the one used for the
	* convenience pointer cpu->as.
	* The target-specific code which registers ASes is responsible
	* for defining what semantics address space 0, 1, 2, etc have.
	*
	* Before the first call to this function, the caller must set
	* cpu->num_ases to the total number of address spaces it needs
	* to support.
	*
	* Note that with KVM only one address space is supported.
	*/
	void cpu_address_space_init(CPUState *cpu, int asidx,
	const char prefix, MemoryRegion mr);
	/**
	* cpu_address_space_destroy:
	* @cpu: CPU for which address space needs to be destroyed
	* @asidx: integer index of this address space
	*
	* Note that with KVM only one address space is supported.
	*/
	void cpu_address_space_destroy(CPUState *cpu, int asidx);

	void cpu_physical_memory_rw(hwaddr addr, void *buf,
	hwaddr len, bool is_write);
	static inline void cpu_physical_memory_read(hwaddr addr,
	void *buf, hwaddr len)
	{
	cpu_physical_memory_rw(addr, buf, len, false);
	}
	static inline void cpu_physical_memory_write(hwaddr addr,
	const void *buf, hwaddr len)
	{
	cpu_physical_memory_rw(addr, (void *)buf, len, true);
	}
	void *cpu_physical_memory_map(hwaddr addr,
	hwaddr *plen,
	bool is_write);
	void cpu_physical_memory_unmap(void *buffer, hwaddr len,
	bool is_write, hwaddr access_len);

	bool cpu_physical_memory_is_io(hwaddr phys_addr);

	/* Coalesced MMIO regions are areas where write operations can be reordered.
	* This usually implies that write operations are side-effect free. This allows
	* batching which can make a major impact on performance when using
	* virtualization.
	*/
	void qemu_flush_coalesced_mmio_buffer(void);

	void cpu_flush_icache_range(hwaddr start, hwaddr len);

	typedef int (RAMBlockIterFunc)(RAMBlock rb, void opaque);

	int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque);
	int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length);
	int ram_block_discard_guest_memfd_range(RAMBlock *rb, uint64_t start,
	size_t length);

	#endif

	/* Returns: 0 on success, -1 on error */
	int cpu_memory_rw_debug(CPUState *cpu, vaddr addr,
	void *ptr, size_t len, bool is_write);

	/* vl.c */
	void list_cpus(void);

	#ifdef CONFIG_TCG

	bool tcg_cflags_has(CPUState *cpu, uint32_t flags);
	void tcg_cflags_set(CPUState *cpu, uint32_t flags);

	/* current cflags for hashing/comparison */
	uint32_t curr_cflags(CPUState *cpu);

	/**
	* cpu_unwind_state_data:
	* @cpu: the cpu context
	* @host_pc: the host pc within the translation
	* @data: output data
	*
	* Attempt to load the the unwind state for a host pc occurring in
	* translated code. If @host_pc is not in translated code, the
	* function returns false; otherwise @data is loaded.
	* This is the same unwind info as given to restore_state_to_opc.
	*/
	bool cpu_unwind_state_data(CPUState cpu, uintptr_t host_pc, uint64_t data);

	/**
	* cpu_restore_state:
	* @cpu: the cpu context
	* @host_pc: the host pc within the translation
	* @return: true if state was restored, false otherwise
	*
	* Attempt to restore the state for a fault occurring in translated
	* code. If @host_pc is not in translated code no state is
	* restored and the function returns false.
	*/
	bool cpu_restore_state(CPUState *cpu, uintptr_t host_pc);

	G_NORETURN void cpu_loop_exit_noexc(CPUState *cpu);
	G_NORETURN void cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc);
	#endif /* CONFIG_TCG */
	G_NORETURN void cpu_loop_exit(CPUState *cpu);
	G_NORETURN void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc);

	/* accel/tcg/cpu-exec.c */
	int cpu_exec(CPUState *cpu);

	/**
	* env_archcpu(env)
	* @env: The architecture environment
	*
	* Return the ArchCPU associated with the environment.
	*/
	static inline ArchCPU env_archcpu(CPUArchState env)
	{
	return (void *)env - sizeof(CPUState);
	}

	/**
	* env_cpu(env)
	* @env: The architecture environment
	*
	* Return the CPUState associated with the environment.
	*/
	static inline CPUState env_cpu(CPUArchState env)
	{
	return (void *)env - sizeof(CPUState);
	}

	#ifndef CONFIG_USER_ONLY
	/**
	* cpu_mmu_index:
	* @env: The cpu environment
	* @ifetch: True for code access, false for data access.
	*
	* Return the core mmu index for the current translation regime.
	* This function is used by generic TCG code paths.
	*
	* The user-only version of this function is inline in cpu-all.h,
	* where it always returns MMU_USER_IDX.
	*/
	static inline int cpu_mmu_index(CPUState *cs, bool ifetch)
	{
	int ret = cs->cc->mmu_index(cs, ifetch);
	tcg_debug_assert(ret >= 0 && ret < NB_MMU_MODES);
	return ret;
	}
	#endif /* !CONFIG_USER_ONLY */

	#endif /* CPU_COMMON_H */