Archipelago » qemu

/*

 * Block driver for Conectix/Microsoft Virtual PC images

 * Copyright (c) 2005 Alex Beregszaszi

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

typedef struct BDRVVPCState {

    int fd;

    int pagetable_entries;

    uint32_t *pagetable;

    uint8_t *pageentry_u8;

    uint32_t *pageentry_u32;

    uint16_t *pageentry_u16;

    uint64_t last_bitmap;

#endif

} BDRVVPCState;

        return -1;

    bs->read_only = 1; // no write support yet

    s->fd = fd;

    if (read(fd, &header, HEADER_SIZE) != HEADER_SIZE)

    pagetable_index = offset / s->pageentry_size;

    pageentry_index = (offset % s->pageentry_size) / 512;

    if (pagetable_index > s->pagetable_entries || s->pagetable[pagetable_index] == 0xffffffff)

	return -1; // not allocated

    bitmap_offset = 512 * s->pagetable[pagetable_index];

    block_offset = bitmap_offset + 512 + (512 * pageentry_index);

//    printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n",

//	sector_num, pagetable_index, pageentry_index,

//	bitmap_offset, block_offset);

	lseek(s->fd, bitmap_offset, SEEK_SET);

	s->last_bitmap = bitmap_offset;

	// Scary! Bitmap is stored as big endian 32bit entries,

	// while we used to look it up byte by byte

	read(s->fd, s->pageentry_u8, 512);

	return -1;

#else

    lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET);

    read(s->fd, &bitmap_entry, 1);

    if ((bitmap_entry >> (pageentry_index % 8)) & 1)

    return 0;

}

                    uint8_t *buf, int nb_sectors)

{

    BDRVVPCState *s = bs->opaque;