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disk: BIOS: Yucky workaround to a workaround to an HP Pavillion something

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This commit is contained in:
mintsuki 2024-05-08 20:55:27 +02:00
parent 9109b40756
commit 40a772033a
1 changed files with 47 additions and 6 deletions
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53
common/drivers/disk.s2.c
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@ -143,6 +143,39 @@ 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};
@ -214,7 +247,7 @@ void disk_create_index(void) {
// Disk count (only non-removable) at 0040:0075
uint8_t bda_disk_count = mminb(rm_desegment(0x0040, 0x0075));
int optical_indices = 1, hdd_indices = 1;
int optical_indices = 1, hdd_indices = 1, consumed_bda_disks = 0;
for (uint8_t drive = 0x80; drive != 0 /* overflow */; drive++) {
struct rm_regs r = {0};
@ -246,10 +279,6 @@ void disk_create_index(void) {
}
}
if (!is_removable && hdd_indices > bda_disk_count) {
continue;
}
struct volume *block = ext_mem_alloc(sizeof(struct volume));
block->drive = drive;
@ -262,7 +291,19 @@ void disk_create_index(void) {
continue;
}
block->is_optical = is_removable;
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) && block->sector_size == 2048;
if (!is_removable && !block->is_optical) {
if (consumed_bda_disks == bda_disk_count) {
pmm_free(block, sizeof(struct volume));
continue;
}
consumed_bda_disks++;
}
if (block->is_optical) {
block->index = optical_indices++;