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disk: On BIOS, change how optical is determined

This commit is contained in:
mintsuki 2022-10-09 09:02:32 +02:00
parent 0744033703
commit 2e05e4ca40
1 changed files with 40 additions and 7 deletions
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47
common/drivers/disk.s2.c
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@ -126,6 +126,39 @@ int disk_read_sectors(struct volume *volume, void *buf, uint64_t block, size_t c
return DISK_SUCCESS;
}
static int disk_write_sectors(struct volume *volume, void *buf, uint64_t block, size_t count) {
struct dap dap = {0};
if (count * volume->sector_size > XFER_BUF_SIZE)
panic(false, "XFER");
if (xfer_buf == NULL)
xfer_buf = conv_mem_alloc(XFER_BUF_SIZE);
dap.size = 16;
dap.count = count;
dap.segment = rm_seg(xfer_buf);
dap.offset = rm_off(xfer_buf);
dap.lba = block;
struct rm_regs r = {0};
r.eax = 0x4301;
r.edx = volume->drive;
r.esi = (uint32_t)rm_off(&dap);
r.ds = rm_seg(&dap);
if (buf != NULL)
memcpy(xfer_buf, buf, count * volume->sector_size);
rm_int(0x13, &r, &r);
if (r.eflags & EFLAGS_CF) {
return DISK_FAILURE;
}
return DISK_SUCCESS;
}
static bool detect_sector_size(struct volume *volume) {
struct dap dap = {0};
@ -226,14 +259,14 @@ void disk_create_index(void) {
continue;
}
if (drive_params.info_flags & (1 << 2) && drive > 0x8f) {
// The medium could not be present (e.g.: CD-ROMs)
// Do a test run to see if we can actually read it
if (disk_read_sectors(block, NULL, 0, 1) != DISK_SUCCESS) {
continue;
}
if (disk_read_sectors(block, xfer_buf, 0, 1) != DISK_SUCCESS) {
continue;
}
block->is_optical = disk_write_sectors(block, xfer_buf, 0, 1) != DISK_SUCCESS;
if (block->is_optical) {
block->index = optical_indices++;
block->is_optical = true;
} else {
block->index = hdd_indices++;
}