Add a bootmeth driver which handles distro boot from a disk, so we can boot a bootflow using this commonly used mechanism.
In effect, this provides the same functionality as the 'sysboot' command and shares the same code. But the interface into it is via a bootmeth.
For now this requires the 'pxe' command be enabled. Future work may tidy this up so that it can be used without CONFIG_CMDLINE being enabled.
Signed-off-by: Simon Glass sjg@chromium.org ---
Changes in v3: - Use new bootmeth_try_file() function - Use a short name when BOOTSTD_FULL is not enabled - Use common bootmeth functions
MAINTAINERS | 3 +- boot/Kconfig | 15 +++++ boot/Makefile | 2 + boot/bootmeth_distro.c | 142 +++++++++++++++++++++++++++++++++++++++++ include/distro.h | 24 +++++++ 5 files changed, 185 insertions(+), 1 deletion(-) create mode 100644 boot/bootmeth_distro.c create mode 100644 include/distro.h
diff --git a/MAINTAINERS b/MAINTAINERS index ea8f8fdec91..e907151276a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -668,7 +668,8 @@ F: boot/bootflow.c F: boot/bootmeth*.c F: boot/bootstd.c F: cmd/bootdev.c -F: include/bootdev*.h +F: cmd/bootflow.c +F: include/bootdev.h F: include/bootflow.h F: include/bootmeth.h F: include/bootstd.h diff --git a/boot/Kconfig b/boot/Kconfig index 032f0b93c68..45d38a226cb 100644 --- a/boot/Kconfig +++ b/boot/Kconfig @@ -315,6 +315,21 @@ config BOOTSTD_FULL - support for selecting the ordering of bootdevs using the devicetree as well as the "boot_targets" environment variable
+if BOOTSTD + +config BOOTMETH_DISTRO + bool "Bootdev support for distro boot" + depends on CMD_PXE + default y + help + Enables support for distro boot using bootdevs. This makes the + bootdevs look for a 'extlinux/extlinux.conf' on each filesystem + they scan. + + This provides a way to try out standard boot on an existing boot flow. + +endif + config LEGACY_IMAGE_FORMAT bool "Enable support for the legacy image format" default y if !FIT_SIGNATURE diff --git a/boot/Makefile b/boot/Makefile index f58c192ae07..d8f5c340b85 100644 --- a/boot/Makefile +++ b/boot/Makefile @@ -28,6 +28,8 @@ obj-$(CONFIG_$(SPL_TPL_)BOOTSTD) += bootflow.o obj-$(CONFIG_$(SPL_TPL_)BOOTSTD) += bootmeth-uclass.o obj-$(CONFIG_$(SPL_TPL_)BOOTSTD) += bootstd-uclass.o
+obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_DISTRO) += bootmeth_distro.o + obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += image-fdt.o obj-$(CONFIG_$(SPL_TPL_)FIT_SIGNATURE) += fdt_region.o obj-$(CONFIG_$(SPL_TPL_)FIT) += image-fit.o diff --git a/boot/bootmeth_distro.c b/boot/bootmeth_distro.c new file mode 100644 index 00000000000..7960b70979b --- /dev/null +++ b/boot/bootmeth_distro.c @@ -0,0 +1,142 @@ +// 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 disto_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; +} + +static int distro_read_bootflow(struct udevice *dev, struct bootflow *bflow) +{ + struct blk_desc *desc = dev_get_uclass_plat(bflow->blk); + 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); + + /* We require a partition table */ + if (!bflow->part) + return -ENOENT; + + prefixes = bootstd_get_prefixes(bootstd); + i = 0; + 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); + + 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, disto_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 = { + .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, +}; diff --git a/include/distro.h b/include/distro.h new file mode 100644 index 00000000000..2ee145871b2 --- /dev/null +++ b/include/distro.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright 2021 Google LLC + * Written by Simon Glass sjg@chromium.org + */ + +#ifndef __distro_h +#define __distro_h + +#define DISTRO_FNAME "extlinux/extlinux.conf" + +/** + * struct distro_info - useful information for distro_getfile() + * + * @dev: bootmethod device being used to boot + * @bflow: bootflow being booted + */ +struct distro_info { + struct udevice *dev; + struct bootflow *bflow; + struct cmd_tbl *cmdtp; +}; + +#endif