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// SPDX-License-Identifier: GPL-2.0+
/*
* Bootmethod for ChromiumOS
*
* Copyright 2023 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_CATEGORY UCLASS_BOOTSTD
#include <common.h>
#include <blk.h>
#include <bootdev.h>
#include <bootflow.h>
#include <bootmeth.h>
#include <dm.h>
#include <malloc.h>
#include <mapmem.h>
#include <part.h>
#ifdef CONFIG_X86
#include <asm/zimage.h>
#endif
#include <linux/sizes.h>
enum {
/* Offsets in the kernel-partition header */
KERN_START = 0x4f0,
KERN_SIZE = 0x518,
SETUP_OFFSET = 0x1000, /* bytes before base */
CMDLINE_OFFSET = 0x2000, /* bytes before base */
OFFSET_BASE = 0x100000, /* assumed kernel load-address */
};
static int cros_check(struct udevice *dev, struct bootflow_iter *iter)
{
/* This only works on block and network devices */
if (bootflow_iter_check_blk(iter))
return log_msg_ret("blk", -ENOTSUPP);
return 0;
}
static int copy_cmdline(const char *from, const char *uuid, char **bufp)
{
const int maxlen = 2048;
char buf[maxlen];
char *cmd, *to, *end;
int len;
/* Allow space for cmdline + UUID */
len = strnlen(from, sizeof(buf));
if (len >= maxlen)
return -E2BIG;
log_debug("uuid %d %s\n", uuid ? (int)strlen(uuid) : 0, uuid);
for (to = buf, end = buf + maxlen - UUID_STR_LEN - 1; *from; from++) {
if (to >= end)
return -E2BIG;
if (from[0] == '%' && from[1] == 'U' && uuid &&
strlen(uuid) == UUID_STR_LEN) {
strcpy(to, uuid);
to += UUID_STR_LEN;
from++;
} else {
*to++ = *from;
}
}
*to = '\0';
len = to - buf;
cmd = strdup(buf);
if (!cmd)
return -ENOMEM;
free(*bufp);
*bufp = cmd;
return 0;
}
static int cros_read_bootflow(struct udevice *dev, struct bootflow *bflow)
{
struct blk_desc *desc = dev_get_uclass_plat(bflow->blk);
ulong base, start, size, setup, cmdline, num_blks, kern_base;
struct disk_partition info;
const char *uuid = NULL;
void *buf, *hdr;
int ret;
log_debug("starting, part=%d\n", bflow->part);
/* We consider the whole disk, not any one partition */
if (bflow->part)
return log_msg_ret("max", -ENOENT);
/* Check partition 2 */
ret = part_get_info(desc, 2, &info);
if (ret)
return log_msg_ret("part", ret);
/* Make a buffer for the header information */
num_blks = SZ_4K >> desc->log2blksz;
log_debug("Reading header, blk=%s, start=%lx, blocks=%lx\n",
bflow->blk->name, (ulong)info.start, num_blks);
hdr = memalign(SZ_1K, SZ_4K);
if (!hdr)
return log_msg_ret("hdr", -ENOMEM);
ret = blk_read(bflow->blk, info.start, num_blks, hdr);
if (ret != num_blks)
return log_msg_ret("inf", ret);
if (memcmp("CHROMEOS", hdr, 8))
return -ENOENT;
log_info("Header at %lx\n", (ulong)map_to_sysmem(hdr));
start = *(u32 *)(hdr + KERN_START);
size = ALIGN(*(u32 *)(hdr + KERN_SIZE), desc->blksz);
log_debug("Reading start %lx size %lx\n", start, size);
bflow->size = size;
buf = memalign(SZ_1K, size);
if (!buf)
return log_msg_ret("buf", -ENOMEM);
num_blks = size >> desc->log2blksz;
log_debug("Reading data, blk=%s, start=%lx, blocks=%lx\n",
bflow->blk->name, (ulong)info.start, num_blks);
ret = blk_read(bflow->blk, (ulong)info.start + 0x80, num_blks, buf);
if (ret != num_blks)
return log_msg_ret("inf", ret);
base = map_to_sysmem(buf);
setup = base + start - OFFSET_BASE - SETUP_OFFSET;
cmdline = base + start - OFFSET_BASE - CMDLINE_OFFSET;
kern_base = base + start - OFFSET_BASE + SZ_16K;
log_debug("base %lx setup %lx, cmdline %lx, kern_base %lx\n", base,
setup, cmdline, kern_base);
#ifdef CONFIG_X86
const char *version;
version = zimage_get_kernel_version(map_sysmem(setup, 0),
map_sysmem(kern_base, 0));
log_debug("version %s\n", version);
if (version)
bflow->name = strdup(version);
#endif
if (!bflow->name)
bflow->name = strdup("ChromeOS");
if (!bflow->name)
return log_msg_ret("nam", -ENOMEM);
bflow->os_name = strdup("ChromeOS");
if (!bflow->os_name)
return log_msg_ret("os", -ENOMEM);
#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
uuid = info.uuid;
#endif
ret = copy_cmdline(map_sysmem(cmdline, 0), uuid, &bflow->cmdline);
if (ret)
return log_msg_ret("cmd", ret);
bflow->state = BOOTFLOWST_READY;
bflow->buf = buf;
bflow->x86_setup = map_sysmem(setup, 0);
return 0;
}
static int cros_read_file(struct udevice *dev, struct bootflow *bflow,
const char *file_path, ulong addr, ulong *sizep)
{
return -ENOSYS;
}
static int cros_boot(struct udevice *dev, struct bootflow *bflow)
{
#ifdef CONFIG_X86
zboot_start(map_to_sysmem(bflow->buf), bflow->size, 0, 0,
map_to_sysmem(bflow->x86_setup),
bflow->cmdline);
#endif
return log_msg_ret("go", -EFAULT);
}
static int cros_bootmeth_bind(struct udevice *dev)
{
struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);
plat->desc = "ChromiumOS boot";
return 0;
}
static struct bootmeth_ops cros_bootmeth_ops = {
.check = cros_check,
.read_bootflow = cros_read_bootflow,
.read_file = cros_read_file,
.boot = cros_boot,
};
static const struct udevice_id cros_bootmeth_ids[] = {
{ .compatible = "u-boot,cros" },
{ }
};
U_BOOT_DRIVER(bootmeth_cros) = {
.name = "bootmeth_cros",
.id = UCLASS_BOOTMETH,
.of_match = cros_bootmeth_ids,
.ops = &cros_bootmeth_ops,
.bind = cros_bootmeth_bind,
};
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