/*
 * defines common to all virtual CPUs
 *
 *  Copyright (c) 2003 Fabrice Bellard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
#ifndef CPU_ALL_H
#define CPU_ALL_H

#include "exec/cpu-common.h"
#include "exec/memory.h"
#include "qemu/thread.h"
#include "qom/cpu.h"
#include "qemu/rcu.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 */

/* some important defines:
 *
 * HOST_WORDS_BIGENDIAN : if defined, the host cpu is big endian and
 * otherwise little endian.
 *
 * TARGET_WORDS_BIGENDIAN : same for target cpu
 */

#if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
#define BSWAP_NEEDED
#endif

#ifdef BSWAP_NEEDED

static inline uint16_t tswap16(uint16_t s)
{
    return bswap16(s);
}

static inline uint32_t tswap32(uint32_t s)
{
    return bswap32(s);
}

static inline uint64_t tswap64(uint64_t s)
{
    return bswap64(s);
}

static inline void tswap16s(uint16_t *s)
{
    *s = bswap16(*s);
}

static inline void tswap32s(uint32_t *s)
{
    *s = bswap32(*s);
}

static inline void tswap64s(uint64_t *s)
{
    *s = bswap64(*s);
}

#else

static inline uint16_t tswap16(uint16_t s)
{
    return s;
}

static inline uint32_t tswap32(uint32_t s)
{
    return s;
}

static inline uint64_t tswap64(uint64_t s)
{
    return s;
}

static inline void tswap16s(uint16_t *s)
{
}

static inline void tswap32s(uint32_t *s)
{
}

static inline void tswap64s(uint64_t *s)
{
}

#endif

#if TARGET_LONG_SIZE == 4
#define tswapl(s) tswap32(s)
#define tswapls(s) tswap32s((uint32_t *)(s))
#define bswaptls(s) bswap32s(s)
#else
#define tswapl(s) tswap64(s)
#define tswapls(s) tswap64s((uint64_t *)(s))
#define bswaptls(s) bswap64s(s)
#endif

/* Target-endianness CPU memory access functions. These fit into the
 * {ld,st}{type}{sign}{size}{endian}_p naming scheme described in bswap.h.
 */
#if defined(TARGET_WORDS_BIGENDIAN)
#define lduw_p(p) lduw_be_p(p)
#define ldsw_p(p) ldsw_be_p(p)
#define ldl_p(p) ldl_be_p(p)
#define ldq_p(p) ldq_be_p(p)
#define ldfl_p(p) ldfl_be_p(p)
#define ldfq_p(p) ldfq_be_p(p)
#define stw_p(p, v) stw_be_p(p, v)
#define stl_p(p, v) stl_be_p(p, v)
#define stq_p(p, v) stq_be_p(p, v)
#define stfl_p(p, v) stfl_be_p(p, v)
#define stfq_p(p, v) stfq_be_p(p, v)
#define ldn_p(p, sz) ldn_be_p(p, sz)
#define stn_p(p, sz, v) stn_be_p(p, sz, v)
#else
#define lduw_p(p) lduw_le_p(p)
#define ldsw_p(p) ldsw_le_p(p)
#define ldl_p(p) ldl_le_p(p)
#define ldq_p(p) ldq_le_p(p)
#define ldfl_p(p) ldfl_le_p(p)
#define ldfq_p(p) ldfq_le_p(p)
#define stw_p(p, v) stw_le_p(p, v)
#define stl_p(p, v) stl_le_p(p, v)
#define stq_p(p, v) stq_le_p(p, v)
#define stfl_p(p, v) stfl_le_p(p, v)
#define stfq_p(p, v) stfq_le_p(p, v)
#define ldn_p(p, sz) ldn_le_p(p, sz)
#define stn_p(p, sz, v) stn_le_p(p, sz, v)
#endif

/* MMU memory access macros */

#if defined(CONFIG_USER_ONLY)
#include "exec/user/abitypes.h"

/* On some host systems the guest address space is reserved on the host.
 * This allows the guest address space to be offset to a convenient location.
 */
extern unsigned long guest_base;
extern int have_guest_base;
extern unsigned long reserved_va;

#if HOST_LONG_BITS <= TARGET_VIRT_ADDR_SPACE_BITS
#define GUEST_ADDR_MAX (~0ul)
#else
#define GUEST_ADDR_MAX (reserved_va ? reserved_va - 1 : \
                                    (1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1)
#endif
#else

#include "exec/hwaddr.h"

#define SUFFIX
#define ARG1         as
#define ARG1_DECL    AddressSpace *as
#define TARGET_ENDIANNESS
#include "exec/memory_ldst.inc.h"

#define SUFFIX       _cached_slow
#define ARG1         cache
#define ARG1_DECL    MemoryRegionCache *cache
#define TARGET_ENDIANNESS
#include "exec/memory_ldst.inc.h"

static inline void stl_phys_notdirty(AddressSpace *as, hwaddr addr, uint32_t val)
{
    address_space_stl_notdirty(as, addr, val,
                               MEMTXATTRS_UNSPECIFIED, NULL);
}

#define SUFFIX
#define ARG1         as
#define ARG1_DECL    AddressSpace *as
#define TARGET_ENDIANNESS
#include "exec/memory_ldst_phys.inc.h"

/* Inline fast path for direct RAM access.  */
#define ENDIANNESS
#include "exec/memory_ldst_cached.inc.h"

#define SUFFIX       _cached
#define ARG1         cache
#define ARG1_DECL    MemoryRegionCache *cache
#define TARGET_ENDIANNESS
#include "exec/memory_ldst_phys.inc.h"
#endif

/* page related stuff */

#ifdef TARGET_PAGE_BITS_VARY
extern bool target_page_bits_decided;
extern int target_page_bits;
#define TARGET_PAGE_BITS ({ assert(target_page_bits_decided); \
                            target_page_bits; })
#else
#define TARGET_PAGE_BITS_MIN TARGET_PAGE_BITS
#endif

#define TARGET_PAGE_SIZE (1 << TARGET_PAGE_BITS)
#define TARGET_PAGE_MASK ~(TARGET_PAGE_SIZE - 1)
#define TARGET_PAGE_ALIGN(addr) (((addr) + TARGET_PAGE_SIZE - 1) & TARGET_PAGE_MASK)

/* Using intptr_t ensures that qemu_*_page_mask is sign-extended even
 * when intptr_t is 32-bit and we are aligning a long long.
 */
extern uintptr_t qemu_host_page_size;
extern intptr_t qemu_host_page_mask;

#define HOST_PAGE_ALIGN(addr) (((addr) + qemu_host_page_size - 1) & qemu_host_page_mask)
#define REAL_HOST_PAGE_ALIGN(addr) (((addr) + qemu_real_host_page_size - 1) & \
                                    qemu_real_host_page_mask)

/* same as PROT_xxx */
#define PAGE_READ      0x0001
#define PAGE_WRITE     0x0002
#define PAGE_EXEC      0x0004
#define PAGE_BITS      (PAGE_READ | PAGE_WRITE | PAGE_EXEC)
#define PAGE_VALID     0x0008
/* original state of the write flag (used when tracking self-modifying
   code */
#define PAGE_WRITE_ORG 0x0010
/* Invalidate the TLB entry immediately, helpful for s390x
 * Low-Address-Protection. Used with PAGE_WRITE in tlb_set_page_with_attrs() */
#define PAGE_WRITE_INV 0x0040
#if defined(CONFIG_BSD) && defined(CONFIG_USER_ONLY)
/* FIXME: Code that sets/uses this is broken and needs to go away.  */
#define PAGE_RESERVED  0x0020
#endif

#if defined(CONFIG_USER_ONLY)
void page_dump(FILE *f);

typedef int (*walk_memory_regions_fn)(void *, target_ulong,
                                      target_ulong, unsigned long);
int walk_memory_regions(void *, walk_memory_regions_fn);

int page_get_flags(target_ulong address);
void page_set_flags(target_ulong start, target_ulong end, int flags);
int page_check_range(target_ulong start, target_ulong len, int flags);
#endif

CPUArchState *cpu_copy(CPUArchState *env);

/* Flags for use in ENV->INTERRUPT_PENDING.

   The numbers assigned here are non-sequential in order to preserve
   binary compatibility with the vmstate dump.  Bit 0 (0x0001) was
   previously used for CPU_INTERRUPT_EXIT, and is cleared when loading
   the vmstate dump.  */

/* External hardware interrupt pending.  This is typically used for
   interrupts from devices.  */
#define CPU_INTERRUPT_HARD        0x0002

/* Exit the current TB.  This is typically used when some system-level device
   makes some change to the memory mapping.  E.g. the a20 line change.  */
#define CPU_INTERRUPT_EXITTB      0x0004

/* Halt the CPU.  */
#define CPU_INTERRUPT_HALT        0x0020

/* Debug event pending.  */
#define CPU_INTERRUPT_DEBUG       0x0080

/* Reset signal.  */
#define CPU_INTERRUPT_RESET       0x0400

/* Several target-specific external hardware interrupts.  Each target/cpu.h
   should define proper names based on these defines.  */
#define CPU_INTERRUPT_TGT_EXT_0   0x0008
#define CPU_INTERRUPT_TGT_EXT_1   0x0010
#define CPU_INTERRUPT_TGT_EXT_2   0x0040
#define CPU_INTERRUPT_TGT_EXT_3   0x0200
#define CPU_INTERRUPT_TGT_EXT_4   0x1000

/* Several target-specific internal interrupts.  These differ from the
   preceding target-specific interrupts in that they are intended to
   originate from within the cpu itself, typically in response to some
   instruction being executed.  These, therefore, are not masked while
   single-stepping within the debugger.  */
#define CPU_INTERRUPT_TGT_INT_0   0x0100
#define CPU_INTERRUPT_TGT_INT_1   0x0800
#define CPU_INTERRUPT_TGT_INT_2   0x2000

/* First unused bit: 0x4000.  */

/* The set of all bits that should be masked when single-stepping.  */
#define CPU_INTERRUPT_SSTEP_MASK \
    (CPU_INTERRUPT_HARD          \
     | CPU_INTERRUPT_TGT_EXT_0   \
     | CPU_INTERRUPT_TGT_EXT_1   \
     | CPU_INTERRUPT_TGT_EXT_2   \
     | CPU_INTERRUPT_TGT_EXT_3   \
     | CPU_INTERRUPT_TGT_EXT_4)

#if !defined(CONFIG_USER_ONLY)

/* Flags stored in the low bits of the TLB virtual address.  These are
 * defined so that fast path ram access is all zeros.
 * The flags all must be between TARGET_PAGE_BITS and
 * maximum address alignment bit.
 */
/* Zero if TLB entry is valid.  */
#define TLB_INVALID_MASK    (1 << (TARGET_PAGE_BITS - 1))
/* Set if TLB entry references a clean RAM page.  The iotlb entry will
   contain the page physical address.  */
#define TLB_NOTDIRTY        (1 << (TARGET_PAGE_BITS - 2))
/* Set if TLB entry is an IO callback.  */
#define TLB_MMIO            (1 << (TARGET_PAGE_BITS - 3))
/* Set if TLB entry must have MMU lookup repeated for every access */
#define TLB_RECHECK         (1 << (TARGET_PAGE_BITS - 4))

/* Use this mask to check interception with an alignment mask
 * in a TCG backend.
 */
#define TLB_FLAGS_MASK  (TLB_INVALID_MASK | TLB_NOTDIRTY | TLB_MMIO \
                         | TLB_RECHECK)

/**
 * tlb_hit_page: return true if page aligned @addr is a hit against the
 * TLB entry @tlb_addr
 *
 * @addr: virtual address to test (must be page aligned)
 * @tlb_addr: TLB entry address (a CPUTLBEntry addr_read/write/code value)
 */
static inline bool tlb_hit_page(target_ulong tlb_addr, target_ulong addr)
{
    return addr == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK));
}

/**
 * tlb_hit: return true if @addr is a hit against the TLB entry @tlb_addr
 *
 * @addr: virtual address to test (need not be page aligned)
 * @tlb_addr: TLB entry address (a CPUTLBEntry addr_read/write/code value)
 */
static inline bool tlb_hit(target_ulong tlb_addr, target_ulong addr)
{
    return tlb_hit_page(tlb_addr, addr & TARGET_PAGE_MASK);
}

void dump_exec_info(void);
void dump_opcount_info(void);
#endif /* !CONFIG_USER_ONLY */

int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
                        uint8_t *buf, target_ulong len, int is_write);

int cpu_exec(CPUState *cpu);

/**
 * cpu_set_cpustate_pointers(cpu)
 * @cpu: The cpu object
 *
 * Set the generic pointers in CPUState into the outer object.
 */
static inline void cpu_set_cpustate_pointers(ArchCPU *cpu)
{
    cpu->parent_obj.env_ptr = &cpu->env;
    cpu->parent_obj.icount_decr_ptr = &cpu->neg.icount_decr;
}

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

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

/**
 * env_neg(env)
 * @env: The architecture environment
 *
 * Return the CPUNegativeOffsetState associated with the environment.
 */
static inline CPUNegativeOffsetState *env_neg(CPUArchState *env)
{
    ArchCPU *arch_cpu = container_of(env, ArchCPU, env);
    return &arch_cpu->neg;
}

/**
 * cpu_neg(cpu)
 * @cpu: The generic CPUState
 *
 * Return the CPUNegativeOffsetState associated with the cpu.
 */
static inline CPUNegativeOffsetState *cpu_neg(CPUState *cpu)
{
    ArchCPU *arch_cpu = container_of(cpu, ArchCPU, parent_obj);
    return &arch_cpu->neg;
}

/**
 * env_tlb(env)
 * @env: The architecture environment
 *
 * Return the CPUTLB state associated with the environment.
 */
static inline CPUTLB *env_tlb(CPUArchState *env)
{
    return &env_neg(env)->tlb;
}

#endif /* CPU_ALL_H */