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// SPDX-License-Identifier: GPL-2.0+
/*
* Bootmethod for distro boot (syslinux boot from a block device)
*
* Copyright 2021 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_CATEGORY UCLASS_BOOTSTD
#include <common.h>
#include <bootdev.h>
#include <bootflow.h>
#include <bootmeth.h>
#include <bootstd.h>
#include <command.h>
#include <distro.h>
#include <dm.h>
#include <fs.h>
#include <malloc.h>
#include <mapmem.h>
#include <mmc.h>
#include <pxe_utils.h>
static int distro_get_state_desc(struct udevice *dev, char *buf, int maxsize)
{
if (IS_ENABLED(CONFIG_SANDBOX)) {
int len;
len = snprintf(buf, maxsize, "OK");
return len + 1 < maxsize ? 0 : -ENOSPC;
}
return 0;
}
static int distro_getfile(struct pxe_context *ctx, const char *file_path,
char *file_addr, ulong *sizep)
{
struct distro_info *info = ctx->userdata;
ulong addr;
int ret;
addr = simple_strtoul(file_addr, NULL, 16);
/* Allow up to 1GB */
*sizep = 1 << 30;
ret = bootmeth_read_file(info->dev, info->bflow, file_path, addr,
sizep);
if (ret)
return log_msg_ret("read", ret);
return 0;
}
static int distro_check(struct udevice *dev, struct bootflow_iter *iter)
{
int ret;
/* This only works on block devices */
ret = bootflow_iter_uses_blk_dev(iter);
if (ret)
return log_msg_ret("blk", ret);
return 0;
}
/**
* distro_fill_info() - Decode the extlinux file to find out distro info
*
* @bflow: Bootflow to process
* @return 0 if OK, -ve on error
*/
static int distro_fill_info(struct bootflow *bflow)
{
struct membuff mb;
char line[200];
char *data;
int len;
log_debug("parsing bflow file size %x\n", bflow->size);
membuff_init(&mb, bflow->buf, bflow->size);
membuff_putraw(&mb, bflow->size, true, &data);
while (len = membuff_readline(&mb, line, sizeof(line) - 1, ' '), len) {
char *tok, *p = line;
tok = strsep(&p, " ");
if (p) {
if (!strcmp("label", tok)) {
bflow->os_name = strdup(p);
if (!bflow->os_name)
return log_msg_ret("os", -ENOMEM);
}
}
}
return 0;
}
static int distro_read_bootflow(struct udevice *dev, struct bootflow *bflow)
{
struct blk_desc *desc;
const char *const *prefixes;
struct udevice *bootstd;
const char *prefix;
loff_t size;
int ret, i;
ret = uclass_first_device_err(UCLASS_BOOTSTD, &bootstd);
if (ret)
return log_msg_ret("std", ret);
/* If a block device, we require a partition table */
if (bflow->blk && !bflow->part)
return -ENOENT;
prefixes = bootstd_get_prefixes(bootstd);
i = 0;
desc = bflow->blk ? dev_get_uclass_plat(bflow->blk) : NULL;
do {
prefix = prefixes ? prefixes[i] : NULL;
ret = bootmeth_try_file(bflow, desc, prefix, DISTRO_FNAME);
} while (ret && prefixes && prefixes[++i]);
if (ret)
return log_msg_ret("try", ret);
size = bflow->size;
ret = bootmeth_alloc_file(bflow, 0x10000, 1);
if (ret)
return log_msg_ret("read", ret);
ret = distro_fill_info(bflow);
if (ret)
return log_msg_ret("inf", ret);
return 0;
}
static int distro_boot(struct udevice *dev, struct bootflow *bflow)
{
struct cmd_tbl cmdtp = {}; /* dummy */
struct pxe_context ctx;
struct distro_info info;
ulong addr;
int ret;
addr = map_to_sysmem(bflow->buf);
info.dev = dev;
info.bflow = bflow;
ret = pxe_setup_ctx(&ctx, &cmdtp, distro_getfile, &info, true,
bflow->subdir);
if (ret)
return log_msg_ret("ctx", -EINVAL);
ret = pxe_process(&ctx, addr, false);
if (ret)
return log_msg_ret("bread", -EINVAL);
return 0;
}
static int distro_bootmeth_bind(struct udevice *dev)
{
struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);
plat->desc = IS_ENABLED(CONFIG_BOOTSTD_FULL) ?
"Syslinux boot from a block device" : "syslinux";
return 0;
}
static struct bootmeth_ops distro_bootmeth_ops = {
.get_state_desc = distro_get_state_desc,
.check = distro_check,
.read_bootflow = distro_read_bootflow,
.read_file = bootmeth_common_read_file,
.boot = distro_boot,
};
static const struct udevice_id distro_bootmeth_ids[] = {
{ .compatible = "u-boot,distro-syslinux" },
{ }
};
U_BOOT_DRIVER(bootmeth_distro) = {
.name = "bootmeth_distro",
.id = UCLASS_BOOTMETH,
.of_match = distro_bootmeth_ids,
.ops = &distro_bootmeth_ops,
.bind = distro_bootmeth_bind,
};
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