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bootstd: cros: Add a function to read a kernel

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The code to read the ChromiumOS information from the partition is
currently all in one function.

Create a new function which reads the kernel, assuming that the metadata
has been parsed.

For now this function is not used. Future work will plumb it in.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2023-07-30 11:16:58 -06:00
parent f861b1ee70
commit 074503c40a
1 changed files with 39 additions and 0 deletions
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39
boot/bootmeth_cros.c
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@ -294,6 +294,45 @@ static int cros_read_info(struct bootflow *bflow, const char *uuid,
return 0;
}
static int cros_read_kernel(struct bootflow *bflow)
{
struct blk_desc *desc = dev_get_uclass_plat(bflow->blk);
struct cros_priv *priv = bflow->bootmeth_priv;
ulong base, setup;
ulong num_blks;
void *buf;
int ret;
bflow->size = priv->body_size;
buf = memalign(SZ_1K, priv->body_size);
if (!buf)
return log_msg_ret("buf", -ENOMEM);
/* Check that the header is not smaller than permitted */
if (priv->body_offset < PROBE_SIZE)
return log_msg_ret("san", EFAULT);
/* Read kernel body */
num_blks = priv->body_size >> desc->log2blksz;
log_debug("Reading body to %lx, blk=%s, size=%lx, blocks=%lx\n",
(ulong)map_to_sysmem(buf), bflow->blk->name, priv->body_size,
num_blks);
ret = blk_read(bflow->blk,
priv->part_start + (priv->body_offset >> desc->log2blksz),
num_blks, buf);
if (ret != num_blks)
return log_msg_ret("inf", -EIO);
base = map_to_sysmem(buf) + priv->bootloader_address -
priv->body_load_address;
setup = base + X86_SETUP_OFFSET;
bflow->buf = buf;
bflow->x86_setup = map_sysmem(setup, 0);
return 0;
}
static int cros_read_bootflow(struct udevice *dev, struct bootflow *bflow)
{
struct blk_desc *desc = dev_get_uclass_plat(bflow->blk);