/*
 * 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 "qemu-common.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 */

/* some important defines:
 *
 * WORDS_ALIGNED : if defined, the host cpu can only make word aligned
 * memory accesses.
 *
 * HOST_WORDS_BIGENDIAN : if defined, the host cpu is big endian and
 * otherwise little endian.
 *
 * (TARGET_WORDS_ALIGNED : same for target cpu (not supported yet))
 *
 * 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)
#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)
#endif

/* MMU memory access macros */

#if defined(CONFIG_USER_ONLY)
#include <assert.h>
#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.
 */
#if defined(CONFIG_USE_GUEST_BASE)
extern unsigned long guest_base;
extern int have_guest_base;
extern unsigned long reserved_va;
#define GUEST_BASE guest_base
#define RESERVED_VA reserved_va
#else
#define GUEST_BASE 0ul
#define RESERVED_VA 0ul
#endif

#define GUEST_ADDR_MAX (RESERVED_VA ? RESERVED_VA : \
                                    (1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1)
#endif

/* page related stuff */

#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)

/* ??? These should be the larger of uintptr_t and target_ulong.  */
extern uintptr_t qemu_real_host_page_size;
extern uintptr_t qemu_host_page_size;
extern uintptr_t qemu_host_page_mask;

#define HOST_PAGE_ALIGN(addr) (((addr) + qemu_host_page_size - 1) & qemu_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
#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)

/* memory API */

typedef struct RAMBlock RAMBlock;

struct RAMBlock {
    struct rcu_head rcu;
    struct MemoryRegion *mr;
    uint8_t *host;
    ram_addr_t offset;
    ram_addr_t used_length;
    ram_addr_t max_length;
    void (*resized)(const char*, uint64_t length, void *host);
    uint32_t flags;
    /* Protected by iothread lock.  */
    char idstr[256];
    /* RCU-enabled, writes protected by the ramlist lock */
    QLIST_ENTRY(RAMBlock) next;
    int fd;
};

static inline void *ramblock_ptr(RAMBlock *block, ram_addr_t offset)
{
    assert(offset < block->used_length);
    assert(block->host);
    return (char *)block->host + offset;
}

typedef struct RAMList {
    QemuMutex mutex;
    /* Protected by the iothread lock.  */
    unsigned long *dirty_memory[DIRTY_MEMORY_NUM];
    RAMBlock *mru_block;
    /* RCU-enabled, writes protected by the ramlist lock. */
    QLIST_HEAD(, RAMBlock) blocks;
    uint32_t version;
} RAMList;
extern RAMList ram_list;

/* Flags stored in the low bits of the TLB virtual address.  These are
   defined so that fast path ram access is all zeros.  */
/* Zero if TLB entry is valid.  */
#define TLB_INVALID_MASK   (1 << 3)
/* Set if TLB entry references a clean RAM page.  The iotlb entry will
   contain the page physical address.  */
#define TLB_NOTDIRTY    (1 << 4)
/* Set if TLB entry is an IO callback.  */
#define TLB_MMIO        (1 << 5)

void dump_exec_info(FILE *f, fprintf_function cpu_fprintf);
void dump_opcount_info(FILE *f, fprintf_function cpu_fprintf);
ram_addr_t last_ram_offset(void);
void qemu_mutex_lock_ramlist(void);
void qemu_mutex_unlock_ramlist(void);
#endif /* !CONFIG_USER_ONLY */

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

#endif /* CPU_ALL_H */