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authorShao Miller <shao.miller@yrdsb.edu.on.ca>2010-06-28 01:53:28 -0400
committerShao Miller <shao.miller@yrdsb.edu.on.ca>2010-07-10 01:03:05 -0400
commit4a59565ca20050aece0ff84bff5afb181ec434df (patch)
tree1aeb1a0ff4d60bd7fce5c86bd656e3fc3141846b /com32/modules
parent4d26d561031e306b0d9e6e14a2a0fe55446f218d (diff)
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chain.c32, libcom32: Move read_sectors() as disk_read_sectors()
Moving portions of chain.c32 into libcom32. Signed-off-by: Shao Miller <shao.miller@yrdsb.edu.on.ca>
Diffstat (limited to 'com32/modules')
-rw-r--r--com32/modules/chain.c94
1 files changed, 14 insertions, 80 deletions
diff --git a/com32/modules/chain.c b/com32/modules/chain.c
index ea04b8b9..0ff1ea1f 100644
--- a/com32/modules/chain.c
+++ b/com32/modules/chain.c
@@ -147,76 +147,6 @@ static inline void error(const char *msg)
static struct disk_info diskinfo;
-/*
- * Get a disk block and return a malloc'd buffer.
- * Uses the disk number and information from diskinfo.
- */
-/* Read count sectors from drive, starting at lba. Return a new buffer */
-static void *read_sectors(uint64_t lba, uint8_t count)
-{
- com32sys_t inreg;
- struct disk_ebios_dapa *dapa = __com32.cs_bounce;
- void *buf = (char *)__com32.cs_bounce + SECTOR;
- void *data;
-
- if (!count)
- /* Silly */
- return NULL;
-
- memset(&inreg, 0, sizeof inreg);
-
- if (diskinfo.ebios) {
- dapa->len = sizeof(*dapa);
- dapa->count = count;
- dapa->off = OFFS(buf);
- dapa->seg = SEG(buf);
- dapa->lba = lba;
-
- inreg.esi.w[0] = OFFS(dapa);
- inreg.ds = SEG(dapa);
- inreg.edx.b[0] = diskinfo.disk;
- inreg.eax.b[1] = 0x42; /* Extended read */
- } else {
- unsigned int c, h, s, t;
-
- if (!diskinfo.cbios) {
- /* We failed to get the geometry */
-
- if (lba)
- return NULL; /* Can only read MBR */
-
- s = 1;
- h = 0;
- c = 0;
- } else {
- s = (lba % diskinfo.sect) + 1;
- t = lba / diskinfo.sect; /* Track = head*cyl */
- h = t % diskinfo.head;
- c = t / diskinfo.head;
- }
-
- if (s > 63 || h > 256 || c > 1023)
- return NULL;
-
- inreg.eax.b[0] = count;
- inreg.eax.b[1] = 0x02; /* Read */
- inreg.ecx.b[1] = c & 0xff;
- inreg.ecx.b[0] = s + (c >> 6);
- inreg.edx.b[1] = h;
- inreg.edx.b[0] = diskinfo.disk;
- inreg.ebx.w[0] = OFFS(buf);
- inreg.es = SEG(buf);
- }
-
- if (disk_int13_retry(&inreg, NULL))
- return NULL;
-
- data = malloc(count * SECTOR);
- if (data)
- memcpy(data, buf, count * SECTOR);
- return data;
-}
-
static int write_sector(unsigned int lba, const void *data)
{
com32sys_t inreg;
@@ -282,7 +212,7 @@ static int write_verify_sector(unsigned int lba, const void *buf)
rv = write_sector(lba, buf);
if (rv)
return rv; /* Write failure */
- rb = read_sectors(lba, 1);
+ rb = disk_read_sectors(&diskinfo, lba, 1);
if (!rb)
return -1; /* Readback failure */
rv = memcmp(buf, rb, SECTOR);
@@ -364,7 +294,7 @@ static int find_disk(uint32_t mbr_sig)
for (drive = 0x80; drive <= 0xff; drive++) {
if (disk_get_params(drive, &diskinfo))
continue; /* Drive doesn't exist */
- if (!(mbr = read_sectors(0, 1)))
+ if (!(mbr = disk_read_sectors(&diskinfo, 0, 1)))
continue; /* Cannot read sector */
is_me = (mbr->disk_sig == mbr_sig);
free(mbr);
@@ -453,7 +383,7 @@ static struct disk_part_iter *next_ebr_part(struct disk_part_iter *part)
/* Load next EBR */
ebr_lba = ebr_table->start_lba + part->private.ebr.lba_extended;
free(part->block);
- part->block = read_sectors(ebr_lba, 1);
+ part->block = disk_read_sectors(&diskinfo, ebr_lba, 1);
if (!part->block) {
error("Could not load EBR!\n");
goto err_ebr;
@@ -813,7 +743,7 @@ static struct disk_part_iter *get_first_partition(struct disk_part_iter *part)
goto err_alloc_iter;
}
/* Read MBR */
- part->block = read_sectors(0, 2);
+ part->block = disk_read_sectors(&diskinfo, 0, 2);
if (!part->block) {
error("Could not read two sectors!\n");
goto err_read_mbr;
@@ -851,9 +781,10 @@ static struct disk_part_iter *get_first_partition(struct disk_part_iter *part)
/* Load the partition table */
free(part->block);
part->block =
- read_sectors(lba_table,
- ((part->private.gpt.size * part->private.gpt.parts) +
- SECTOR - 1) / SECTOR);
+ disk_read_sectors(&diskinfo, lba_table,
+ ((part->private.gpt.size *
+ part->private.gpt.parts) + SECTOR -
+ 1) / SECTOR);
if (!part->block) {
error("Could not read GPT partition list!\n");
goto err_gpt_table;
@@ -894,7 +825,7 @@ static int find_by_guid(const struct guid *gpt_guid,
for (drive = 0x80; drive <= 0xff; drive++) {
if (disk_get_params(drive, &diskinfo))
continue; /* Drive doesn't exist */
- if (!(header = read_sectors(1, 1)))
+ if (!(header = disk_read_sectors(&diskinfo, 1, 1)))
continue; /* Cannot read sector */
if (memcmp(&header->sig, gpt_sig_magic, sizeof(gpt_sig_magic))) {
/* Not a GPT disk */
@@ -1387,7 +1318,7 @@ int main(int argc, char *argv[])
}
/* Get MBR */
- if (!(mbr = read_sectors(0, 1))) {
+ if (!(mbr = disk_read_sectors(&diskinfo, 0, 1))) {
error("Cannot read Master Boot Record or sector 0\n");
goto bail;
}
@@ -1621,7 +1552,10 @@ int main(int argc, char *argv[])
/* Actually read the boot sector */
if (!cur_part) {
data[ndata].data = mbr;
- } else if (!(data[ndata].data = read_sectors(cur_part->lba_data, 1))) {
+ } else
+ if (!
+ (data[ndata].data =
+ disk_read_sectors(&diskinfo, cur_part->lba_data, 1))) {
error("Cannot read boot sector\n");
goto bail;
}