Add a bootmeth driver which handles distro boot from a network device, so we can boot a bootflow using this commonly used mechanism.
In effect, this provides the same functionality as the 'pxe' 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: - Add a log category - Use a short name when BOOTSTD_FULL is not enabled
boot/Kconfig | 10 +++ boot/Makefile | 1 + boot/bootmeth_pxe.c | 186 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 197 insertions(+) create mode 100644 boot/bootmeth_pxe.c
diff --git a/boot/Kconfig b/boot/Kconfig index 45d38a226cb..61df705141d 100644 --- a/boot/Kconfig +++ b/boot/Kconfig @@ -328,6 +328,16 @@ config BOOTMETH_DISTRO
This provides a way to try out standard boot on an existing boot flow.
+config BOOTMETH_DISTRO_PXE + bool "Bootdev support for distro boot over network" + depends on CMD_PXE && CMD_NET && DM_ETH + default y + help + Enables support for distro boot using bootdevs. This makes the + bootdevs look for a 'extlinux/extlinux.conf' on the tftp server. + + This provides a way to try out standard boot on an existing boot flow. + endif
config LEGACY_IMAGE_FORMAT diff --git a/boot/Makefile b/boot/Makefile index d8f5c340b85..170fcac8ec4 100644 --- a/boot/Makefile +++ b/boot/Makefile @@ -29,6 +29,7 @@ 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_)BOOTMETH_DISTRO_PXE) += bootmeth_pxe.o
obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += image-fdt.o obj-$(CONFIG_$(SPL_TPL_)FIT_SIGNATURE) += fdt_region.o diff --git a/boot/bootmeth_pxe.c b/boot/bootmeth_pxe.c new file mode 100644 index 00000000000..f1e2b4c7762 --- /dev/null +++ b/boot/bootmeth_pxe.c @@ -0,0 +1,186 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Bootmethod for distro boot using PXE (network boot) + * + * 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 <command.h> +#include <distro.h> +#include <dm.h> +#include <fs.h> +#include <log.h> +#include <malloc.h> +#include <mapmem.h> +#include <mmc.h> +#include <net.h> +#include <pxe_utils.h> + +static int disto_pxe_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); + 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_pxe_check(struct udevice *dev, struct bootflow_iter *iter) +{ + int ret; + + /* This only works on network devices */ + ret = bootflow_iter_uses_network(iter); + if (ret) + return log_msg_ret("net", ret); + + return 0; +} + +static int distro_pxe_read_bootflow(struct udevice *dev, struct bootflow *bflow) +{ + const char *addr_str; + char fname[200]; + char *bootdir; + ulong addr; + ulong size; + char *buf; + int ret; + + addr_str = env_get("pxefile_addr_r"); + if (!addr_str) + return log_msg_ret("pxeb", -EPERM); + addr = simple_strtoul(addr_str, NULL, 16); + + log_debug("calling pxe_get()\n"); + ret = pxe_get(addr, &bootdir, &size); + log_debug("pxe_get() returned %d\n", ret); + if (ret) + return log_msg_ret("pxeb", ret); + bflow->size = size; + + /* Use the directory of the dhcp bootdir as our subdir, if provided */ + if (bootdir) { + const char *last_slash; + int path_len; + + last_slash = strrchr(bootdir, '/'); + if (last_slash) { + path_len = (last_slash - bootdir) + 1; + bflow->subdir = malloc(path_len + 1); + memcpy(bflow->subdir, bootdir, path_len); + bflow->subdir[path_len] = '\0'; + } + } + snprintf(fname, sizeof(fname), "%s%s", + bflow->subdir ? bflow->subdir : "", DISTRO_FNAME); + + bflow->fname = strdup(fname); + if (!bflow->fname) + return log_msg_ret("name", -ENOMEM); + + bflow->state = BOOTFLOWST_READY; + + /* Allocate the buffer, including the \0 byte added by get_pxe_file() */ + buf = malloc(size + 1); + if (!buf) + return log_msg_ret("buf", -ENOMEM); + memcpy(buf, map_sysmem(addr, 0), size + 1); + bflow->buf = buf; + + return 0; +} + +static int distro_pxe_read_file(struct udevice *dev, struct bootflow *bflow, + const char *file_path, ulong addr, ulong *sizep) +{ + char *tftp_argv[] = {"tftp", NULL, NULL, NULL}; + struct pxe_context *ctx = dev_get_priv(dev); + char file_addr[17]; + ulong size; + int ret; + + sprintf(file_addr, "%lx", addr); + tftp_argv[1] = file_addr; + tftp_argv[2] = (void *)file_path; + + if (do_tftpb(ctx->cmdtp, 0, 3, tftp_argv)) + return -ENOENT; + ret = pxe_get_file_size(&size); + if (ret) + return log_msg_ret("tftp", ret); + if (size > *sizep) + return log_msg_ret("spc", -ENOSPC); + *sizep = size; + + return 0; +} + +static int distro_pxe_boot(struct udevice *dev, struct bootflow *bflow) +{ + struct pxe_context *ctx = dev_get_priv(dev); + struct cmd_tbl cmdtp = {}; /* dummy */ + struct distro_info info; + ulong addr; + int ret; + + addr = map_to_sysmem(bflow->buf); + info.dev = dev; + info.bflow = bflow; + info.cmdtp = &cmdtp; + ret = pxe_setup_ctx(ctx, &cmdtp, disto_pxe_getfile, &info, false, + 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_pxe_bind(struct udevice *dev) +{ + struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev); + + plat->desc = IS_ENABLED(CONFIG_BOOTSTD_FULL) ? + "PXE boot from a network device" : "PXE"; + + return 0; +} + +static struct bootmeth_ops distro_bootmeth_pxe_ops = { + .check = distro_pxe_check, + .read_bootflow = distro_pxe_read_bootflow, + .read_file = distro_pxe_read_file, + .boot = distro_pxe_boot, +}; + +static const struct udevice_id distro_bootmeth_pxe_ids[] = { + { .compatible = "u-boot,distro-pxe" }, + { } +}; + +U_BOOT_DRIVER(bootmeth_pxe) = { + .name = "bootmeth_pxe", + .id = UCLASS_BOOTMETH, + .of_match = distro_bootmeth_pxe_ids, + .ops = &distro_bootmeth_pxe_ops, + .bind = distro_bootmeth_pxe_bind, + .priv_auto = sizeof(struct pxe_context), +};