Archipelago » qemu

/*

 * common defines for all 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_DEFS_H

#define CPU_DEFS_H

#ifndef NEED_CPU_H

#error cpu.h included from common code

#endif

#include "config.h"

#include <setjmp.h>

#include <inttypes.h>

#include "qemu/osdep.h"

#include "qemu/queue.h"

#ifndef CONFIG_USER_ONLY

#include "exec/hwaddr.h"

#endif

#ifndef TARGET_LONG_BITS

#error TARGET_LONG_BITS must be defined before including this header

#endif

#define TARGET_LONG_SIZE (TARGET_LONG_BITS / 8)

/* target_ulong is the type of a virtual address */

#if TARGET_LONG_SIZE == 4

typedef int32_t target_long;

typedef uint32_t target_ulong;

#define TARGET_FMT_lx "%08x"

#define TARGET_FMT_ld "%d"

#define TARGET_FMT_lu "%u"

#elif TARGET_LONG_SIZE == 8

typedef int64_t target_long;

typedef uint64_t target_ulong;

#define TARGET_FMT_lx "%016" PRIx64

#define TARGET_FMT_ld "%" PRId64

#define TARGET_FMT_lu "%" PRIu64

#else

#error TARGET_LONG_SIZE undefined

#endif

#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 TB_JMP_CACHE_BITS 12

#define TB_JMP_CACHE_SIZE (1 << TB_JMP_CACHE_BITS)

/* Only the bottom TB_JMP_PAGE_BITS of the jump cache hash bits vary for

   addresses on the same page.  The top bits are the same.  This allows

   TLB invalidation to quickly clear a subset of the hash table.  */

#define TB_JMP_PAGE_BITS (TB_JMP_CACHE_BITS / 2)

#define TB_JMP_PAGE_SIZE (1 << TB_JMP_PAGE_BITS)

#define TB_JMP_ADDR_MASK (TB_JMP_PAGE_SIZE - 1)

#define TB_JMP_PAGE_MASK (TB_JMP_CACHE_SIZE - TB_JMP_PAGE_SIZE)

#if !defined(CONFIG_USER_ONLY)

#define CPU_TLB_BITS 8

#define CPU_TLB_SIZE (1 << CPU_TLB_BITS)

#if HOST_LONG_BITS == 32 && TARGET_LONG_BITS == 32

#define CPU_TLB_ENTRY_BITS 4

#else

#define CPU_TLB_ENTRY_BITS 5

#endif

typedef struct CPUTLBEntry {

    /* bit TARGET_LONG_BITS to TARGET_PAGE_BITS : virtual address

       bit TARGET_PAGE_BITS-1..4  : Nonzero for accesses that should not

                                    go directly to ram.

       bit 3                      : indicates that the entry is invalid

       bit 2..0                   : zero

    */

    target_ulong addr_read;

    target_ulong addr_write;

    target_ulong addr_code;

    /* Addend to virtual address to get host address.  IO accesses

       use the corresponding iotlb value.  */

    uintptr_t addend;

    /* padding to get a power of two size */

    uint8_t dummy[(1 << CPU_TLB_ENTRY_BITS) -

                  (sizeof(target_ulong) * 3 +

                   ((-sizeof(target_ulong) * 3) & (sizeof(uintptr_t) - 1)) +

                   sizeof(uintptr_t))];

} CPUTLBEntry;

QEMU_BUILD_BUG_ON(sizeof(CPUTLBEntry) != (1 << CPU_TLB_ENTRY_BITS));

#define CPU_COMMON_TLB \

    /* The meaning of the MMU modes is defined in the target code. */   \

    CPUTLBEntry tlb_table[NB_MMU_MODES][CPU_TLB_SIZE];                  \

    hwaddr iotlb[NB_MMU_MODES][CPU_TLB_SIZE];               \

    target_ulong tlb_flush_addr;                                        \

    target_ulong tlb_flush_mask;

#else

#define CPU_COMMON_TLB

#endif

#ifdef HOST_WORDS_BIGENDIAN

typedef struct icount_decr_u16 {

    uint16_t high;

    uint16_t low;

} icount_decr_u16;

#else

typedef struct icount_decr_u16 {

    uint16_t low;

    uint16_t high;

} icount_decr_u16;

#endif

typedef struct CPUBreakpoint {

    target_ulong pc;

    int flags; /* BP_* */

    QTAILQ_ENTRY(CPUBreakpoint) entry;

} CPUBreakpoint;

typedef struct CPUWatchpoint {

    target_ulong vaddr;

    target_ulong len_mask;

    int flags; /* BP_* */

    QTAILQ_ENTRY(CPUWatchpoint) entry;

} CPUWatchpoint;

#define CPU_TEMP_BUF_NLONGS 128

#define CPU_COMMON                                                      \

    /* soft mmu support */                                              \

    /* in order to avoid passing too many arguments to the MMIO         \

       helpers, we store some rarely used information in the CPU        \

       context) */                                                      \

    uintptr_t mem_io_pc; /* host pc at which the memory was             \

                            accessed */                                 \

    target_ulong mem_io_vaddr; /* target virtual addr at which the      \

                                     memory was accessed */             \

    CPU_COMMON_TLB                                                      \

    struct TranslationBlock *tb_jmp_cache[TB_JMP_CACHE_SIZE];           \

                                                                        \

    int64_t icount_extra; /* Instructions until next timer event.  */   \

    /* Number of cycles left, with interrupt flag in high bit.          \

       This allows a single read-compare-cbranch-write sequence to test \

       for both decrementer underflow and exceptions.  */               \

    union {                                                             \

        uint32_t u32;                                                   \

        icount_decr_u16 u16;                                            \

    } icount_decr;                                                      \

    uint32_t can_do_io; /* nonzero if memory mapped IO is safe.  */     \

                                                                        \

    /* from this point: preserved by CPU reset */                       \

    /* ice debug support */                                             \

    QTAILQ_HEAD(breakpoints_head, CPUBreakpoint) breakpoints;            \

                                                                        \

    QTAILQ_HEAD(watchpoints_head, CPUWatchpoint) watchpoints;            \

    CPUWatchpoint *watchpoint_hit;                                      \

                                                                        \

    /* Core interrupt code */                                           \

    sigjmp_buf jmp_env;                                                 \

    int exception_index;                                                \

                                                                        \

    /* user data */                                                     \

    void *opaque;                                                       \

#endif