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phase2: separate partition scan from try_this_kernel

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As an added benefit, we can drop one level of indentation.

Signed-off-by: Werner Almesberger <werner@openmoko.org>
This commit is contained in:
Werner Almesberger 2009-01-09 04:32:48 +00:00 committed by Andy Green
parent 545f0662ef
commit 668e3f5ed9
1 changed files with 49 additions and 40 deletions
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87
qiboot/src/phase2.c
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@ -96,6 +96,53 @@ int read_file(const char * filepath, u8 * destination, int size)
return len;
}
static int do_partitions(void *kernel_dram)
{
unsigned char *p = kernel_dram;
/* if there's a partition table implied, parse it, otherwise
* just use a fixed offset
*/
if (!this_kernel->partition_index) {
partition_offset_blocks =
this_kernel->offset_blocks512_if_no_partition;
return 1;
}
if ((int)this_kernel->block_read(kernel_dram, 0, 4) < 0) {
puts("Bad partition read\n");
indicate(UI_IND_MOUNT_FAIL);
return 0;
}
if ((p[0x1fe] != 0x55) || (p[0x1ff] != 0xaa)) {
puts("partition signature missing\n");
indicate(UI_IND_MOUNT_FAIL);
return 0;
}
p += 0x1be + 8 + (0x10 * (this_kernel->partition_index - 1));
partition_offset_blocks = (((u32)p[3]) << 24) |
(((u32)p[2]) << 16) |
(((u32)p[1]) << 8) |
p[0];
partition_length_blocks = (((u32)p[7]) << 24) |
(((u32)p[6]) << 16) |
(((u32)p[5]) << 8) |
p[4];
puts(" Partition: ");
printdec(this_kernel->partition_index);
puts(" start +");
printdec(partition_offset_blocks);
puts(" 512-byte blocks, size ");
printdec(partition_length_blocks / 2048);
puts(" MiB\n");
return 1;
}
static void do_params(unsigned initramfs_len,
const char *commandline_rootfs_append)
{
@ -217,46 +264,8 @@ static void try_this_kernel(void)
last_block_init = this_kernel->block_init;
}
/* if there's a partition table implied, parse it, otherwise
* just use a fixed offset
*/
if (this_kernel->partition_index) {
unsigned char *p = kernel_dram;
if ((int)this_kernel->block_read(kernel_dram, 0, 4) < 0) {
puts("Bad partition read\n");
indicate(UI_IND_MOUNT_FAIL);
if (!do_partitions(kernel_dram))
return;
}
if ((p[0x1fe] != 0x55) || (p[0x1ff] != 0xaa)) {
puts("partition signature missing\n");
indicate(UI_IND_MOUNT_FAIL);
return;
}
p += 0x1be + 8 + (0x10 * (this_kernel->partition_index - 1));
partition_offset_blocks = (((u32)p[3]) << 24) |
(((u32)p[2]) << 16) |
(((u32)p[1]) << 8) |
p[0];
partition_length_blocks = (((u32)p[7]) << 24) |
(((u32)p[6]) << 16) |
(((u32)p[5]) << 8) |
p[4];
puts(" Partition: ");
printdec(this_kernel->partition_index);
puts(" start +");
printdec(partition_offset_blocks);
puts(" 512-byte blocks, size ");
printdec(partition_length_blocks / 2048);
puts(" MiB\n");
} else
partition_offset_blocks =
this_kernel->offset_blocks512_if_no_partition;
/* does he want us to skip this? */