softmmu_template.h 9.39 KB
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/*
 *  Software MMU support
 * 
 *  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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#define DATA_SIZE (1 << SHIFT)

#if DATA_SIZE == 8
#define SUFFIX q
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#define USUFFIX q
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#define DATA_TYPE uint64_t
#elif DATA_SIZE == 4
#define SUFFIX l
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#define USUFFIX l
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#define DATA_TYPE uint32_t
#elif DATA_SIZE == 2
#define SUFFIX w
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#define USUFFIX uw
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#define DATA_TYPE uint16_t
#elif DATA_SIZE == 1
#define SUFFIX b
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#define USUFFIX ub
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#define DATA_TYPE uint8_t
#else
#error unsupported data size
#endif

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static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(unsigned long addr, 
                                                        int is_user,
                                                        void *retaddr);
static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(unsigned long addr, 
                                                   DATA_TYPE val, 
                                                   int is_user,
                                                   void *retaddr);
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static inline DATA_TYPE glue(io_read, SUFFIX)(unsigned long physaddr, 
                                              unsigned long tlb_addr)
{
    DATA_TYPE res;
    int index;

    index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
#if SHIFT <= 2
    res = io_mem_read[index][SHIFT](physaddr);
#else
#ifdef TARGET_WORDS_BIGENDIAN
    res = (uint64_t)io_mem_read[index][2](physaddr) << 32;
    res |= io_mem_read[index][2](physaddr + 4);
#else
    res = io_mem_read[index][2](physaddr);
    res |= (uint64_t)io_mem_read[index][2](physaddr + 4) << 32;
#endif
#endif /* SHIFT > 2 */
    return res;
}

static inline void glue(io_write, SUFFIX)(unsigned long physaddr, 
                                          DATA_TYPE val,
                                          unsigned long tlb_addr)
{
    int index;

    index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
#if SHIFT <= 2
    io_mem_write[index][SHIFT](physaddr, val);
#else
#ifdef TARGET_WORDS_BIGENDIAN
    io_mem_write[index][2](physaddr, val >> 32);
    io_mem_write[index][2](physaddr + 4, val);
#else
    io_mem_write[index][2](physaddr, val);
    io_mem_write[index][2](physaddr + 4, val >> 32);
#endif
#endif /* SHIFT > 2 */
}

/* handle all cases except unaligned access which span two pages */
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DATA_TYPE REGPARM(1) glue(glue(__ld, SUFFIX), MMUSUFFIX)(unsigned long addr,
                                                         int is_user)
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{
    DATA_TYPE res;
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    int index;
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    unsigned long physaddr, tlb_addr;
    void *retaddr;
    
    /* test if there is match for unaligned or IO access */
    /* XXX: could done more in memory macro in a non portable way */
    index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 redo:
    tlb_addr = env->tlb_read[is_user][index].address;
    if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
        physaddr = addr + env->tlb_read[is_user][index].addend;
        if (tlb_addr & ~TARGET_PAGE_MASK) {
            /* IO access */
            if ((addr & (DATA_SIZE - 1)) != 0)
                goto do_unaligned_access;
            res = glue(io_read, SUFFIX)(physaddr, tlb_addr);
        } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
            /* slow unaligned access (it spans two pages or IO) */
        do_unaligned_access:
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            retaddr = GETPC();
            res = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr, 
                                                         is_user, retaddr);
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        } else {
            /* unaligned access in the same page */
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            res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)physaddr);
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        }
    } else {
        /* the page is not in the TLB : fill it */
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        retaddr = GETPC();
        tlb_fill(addr, 0, is_user, retaddr);
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        goto redo;
    }
    return res;
}

/* handle all unaligned cases */
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static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(unsigned long addr, 
                                                        int is_user,
                                                        void *retaddr)
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{
    DATA_TYPE res, res1, res2;
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    int index, shift;
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    unsigned long physaddr, tlb_addr, addr1, addr2;

    index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 redo:
    tlb_addr = env->tlb_read[is_user][index].address;
    if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
        physaddr = addr + env->tlb_read[is_user][index].addend;
        if (tlb_addr & ~TARGET_PAGE_MASK) {
            /* IO access */
            if ((addr & (DATA_SIZE - 1)) != 0)
                goto do_unaligned_access;
            res = glue(io_read, SUFFIX)(physaddr, tlb_addr);
        } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
        do_unaligned_access:
            /* slow unaligned access (it spans two pages) */
            addr1 = addr & ~(DATA_SIZE - 1);
            addr2 = addr1 + DATA_SIZE;
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            res1 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr1, 
                                                          is_user, retaddr);
            res2 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr2, 
                                                          is_user, retaddr);
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            shift = (addr & (DATA_SIZE - 1)) * 8;
#ifdef TARGET_WORDS_BIGENDIAN
            res = (res1 << shift) | (res2 >> ((DATA_SIZE * 8) - shift));
#else
            res = (res1 >> shift) | (res2 << ((DATA_SIZE * 8) - shift));
#endif
        } else {
            /* unaligned/aligned access in the same page */
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            res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)physaddr);
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        }
    } else {
        /* the page is not in the TLB : fill it */
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        tlb_fill(addr, 0, is_user, retaddr);
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        goto redo;
    }
    return res;
}


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void REGPARM(2) glue(glue(__st, SUFFIX), MMUSUFFIX)(unsigned long addr, 
                                                    DATA_TYPE val,
                                                    int is_user)
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{
    unsigned long physaddr, tlb_addr;
    void *retaddr;
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    int index;
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    index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 redo:
    tlb_addr = env->tlb_write[is_user][index].address;
    if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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        physaddr = addr + env->tlb_write[is_user][index].addend;
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        if (tlb_addr & ~TARGET_PAGE_MASK) {
            /* IO access */
            if ((addr & (DATA_SIZE - 1)) != 0)
                goto do_unaligned_access;
            glue(io_write, SUFFIX)(physaddr, val, tlb_addr);
        } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
        do_unaligned_access:
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            retaddr = GETPC();
            glue(glue(slow_st, SUFFIX), MMUSUFFIX)(addr, val, 
                                                   is_user, retaddr);
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        } else {
            /* aligned/unaligned access in the same page */
            glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val);
        }
    } else {
        /* the page is not in the TLB : fill it */
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        retaddr = GETPC();
        tlb_fill(addr, 1, is_user, retaddr);
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        goto redo;
    }
}

/* handles all unaligned cases */
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static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(unsigned long addr, 
                                                   DATA_TYPE val,
                                                   int is_user,
                                                   void *retaddr)
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{
    unsigned long physaddr, tlb_addr;
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    int index, i;
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    index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 redo:
    tlb_addr = env->tlb_write[is_user][index].address;
    if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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        physaddr = addr + env->tlb_write[is_user][index].addend;
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        if (tlb_addr & ~TARGET_PAGE_MASK) {
            /* IO access */
            if ((addr & (DATA_SIZE - 1)) != 0)
                goto do_unaligned_access;
            glue(io_write, SUFFIX)(physaddr, val, tlb_addr);
        } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
        do_unaligned_access:
            /* XXX: not efficient, but simple */
            for(i = 0;i < DATA_SIZE; i++) {
#ifdef TARGET_WORDS_BIGENDIAN
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                glue(slow_stb, MMUSUFFIX)(addr + i, val >> (((DATA_SIZE - 1) * 8) - (i * 8)), 
                                          is_user, retaddr);
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#else
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                glue(slow_stb, MMUSUFFIX)(addr + i, val >> (i * 8), 
                                          is_user, retaddr);
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#endif
            }
        } else {
            /* aligned/unaligned access in the same page */
            glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val);
        }
    } else {
        /* the page is not in the TLB : fill it */
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        tlb_fill(addr, 1, is_user, retaddr);
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        goto redo;
    }
}

#undef SHIFT
#undef DATA_TYPE
#undef SUFFIX
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#undef USUFFIX
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#undef DATA_SIZE