bootstd: Rename distro and syslinux to extlinux

We use the terms 'distro' to mean extlinux but they are not really the
same. 'Distro' could refer to any method of booting a distribution,
whereas extlinux is a particular method.

Also we sometimes use syslinux, but it is better to use the same term in
all cases.

Rename distro to syslinux and also update bootstd uses of syslinux to use
extlinux instead.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 193 insertions, 0 deletions

diff --git a/boot/bootmeth_extlinux.c b/boot/bootmeth_extlinux.c
new file mode 100644
index 0000000000..24be076022
--- /dev/null
+++ b/boot/bootmeth_extlinux.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Bootmethod for extlinux 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 <dm.h>
+#include <extlinux.h>
+#include <fs.h>
+#include <malloc.h>
+#include <mapmem.h>
+#include <mmc.h>
+#include <pxe_utils.h>
+
+static int extlinux_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 extlinux_getfile(struct pxe_context *ctx, const char *file_path,
+			    char *file_addr, ulong *sizep)
+{
+	struct extlinux_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 extlinux_check(struct udevice *dev, struct bootflow_iter *iter)
+{
+	int ret;
+
+	/* This only works on block devices */
+	ret = bootflow_iter_check_blk(iter);
+	if (ret)
+		return log_msg_ret("blk", ret);
+
+	return 0;
+}
+
+/**
+ * extlinux_fill_info() - Decode the extlinux file to find out its info
+ *
+ * @bflow: Bootflow to process
+ * @return 0 if OK, -ve on error
+ */
+static int extlinux_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 extlinux_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, EXTLINUX_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 = extlinux_fill_info(bflow);
+	if (ret)
+		return log_msg_ret("inf", ret);
+
+	return 0;
+}
+
+static int extlinux_boot(struct udevice *dev, struct bootflow *bflow)
+{
+	struct cmd_tbl cmdtp = {};	/* dummy */
+	struct pxe_context ctx;
+	struct extlinux_info info;
+	ulong addr;
+	int ret;
+
+	addr = map_to_sysmem(bflow->buf);
+	info.dev = dev;
+	info.bflow = bflow;
+	ret = pxe_setup_ctx(&ctx, &cmdtp, extlinux_getfile, &info, true,
+			    bflow->subdir, false);
+	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 extlinux_bootmeth_bind(struct udevice *dev)
+{
+	struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);
+
+	plat->desc = IS_ENABLED(CONFIG_BOOTSTD_FULL) ?
+		"Extlinux boot from a block device" : "extlinux";
+
+	return 0;
+}
+
+static struct bootmeth_ops extlinux_bootmeth_ops = {
+	.get_state_desc	= extlinux_get_state_desc,
+	.check		= extlinux_check,
+	.read_bootflow	= extlinux_read_bootflow,
+	.read_file	= bootmeth_common_read_file,
+	.boot		= extlinux_boot,
+};
+
+static const struct udevice_id extlinux_bootmeth_ids[] = {
+	{ .compatible = "u-boot,extlinux" },
+	{ }
+};
+
+U_BOOT_DRIVER(bootmeth_extlinux) = {
+	.name		= "bootmeth_extlinux",
+	.id		= UCLASS_BOOTMETH,
+	.of_match	= extlinux_bootmeth_ids,
+	.ops		= &extlinux_bootmeth_ops,
+	.bind		= extlinux_bootmeth_bind,
+};