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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 7710282334172bb0b56b4d30ed530d2b856029be / . / boot / bootmeth_distro.c
blob: 2b41e654ade314284e5c4b9214fc158e7e73ac61 [file] [log] [blame]
Simon Glass31aefaf2022-04-24 23:31:13 -0600[diff] [blame]1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Bootmethod for distro boot (syslinux boot from a block device)
4 *
5 * Copyright 2021 Google LLC
6 * Written by Simon Glass <sjg@chromium.org>
7 */
8
9#define LOG_CATEGORY UCLASS_BOOTSTD
10
11#include <common.h>
12#include <bootdev.h>
13#include <bootflow.h>
14#include <bootmeth.h>
15#include <bootstd.h>
16#include <command.h>
17#include <distro.h>
18#include <dm.h>
19#include <fs.h>
20#include <malloc.h>
21#include <mapmem.h>
22#include <mmc.h>
23#include <pxe_utils.h>
24
25static int disto_getfile(struct pxe_context *ctx, const char *file_path,
26 char *file_addr, ulong *sizep)
27{
28 struct distro_info *info = ctx->userdata;
29 ulong addr;
30 int ret;
31
32 addr = simple_strtoul(file_addr, NULL, 16);
33
34 /* Allow up to 1GB */
35 *sizep = 1 << 30;
36 ret = bootmeth_read_file(info->dev, info->bflow, file_path, addr,
37 sizep);
38 if (ret)
39 return log_msg_ret("read", ret);
40
41 return 0;
42}
43
44static int distro_check(struct udevice *dev, struct bootflow_iter *iter)
45{
46 int ret;
47
48 /* This only works on block devices */
49 ret = bootflow_iter_uses_blk_dev(iter);
50 if (ret)
51 return log_msg_ret("blk", ret);
52
53 return 0;
54}
55
56static int distro_read_bootflow(struct udevice *dev, struct bootflow *bflow)
57{
58 struct blk_desc *desc;
59 const char *const *prefixes;
60 struct udevice *bootstd;
61 const char *prefix;
62 loff_t size;
63 int ret, i;
64
65 ret = uclass_first_device_err(UCLASS_BOOTSTD, &bootstd);
66 if (ret)
67 return log_msg_ret("std", ret);
68
69 /* If a block device, we require a partition table */
70 if (bflow->blk && !bflow->part)
71 return -ENOENT;
72
73 prefixes = bootstd_get_prefixes(bootstd);
74 i = 0;
75 desc = bflow->blk ? dev_get_uclass_plat(bflow->blk) : NULL;
76 do {
77 prefix = prefixes ? prefixes[i] : NULL;
78
79 ret = bootmeth_try_file(bflow, desc, prefix, DISTRO_FNAME);
80 } while (ret && prefixes && prefixes[++i]);
81 if (ret)
82 return log_msg_ret("try", ret);
83 size = bflow->size;
84
85 ret = bootmeth_alloc_file(bflow, 0x10000, 1);
86 if (ret)
87 return log_msg_ret("read", ret);
88
89 return 0;
90}
91
92static int distro_boot(struct udevice *dev, struct bootflow *bflow)
93{
94 struct cmd_tbl cmdtp = {}; /* dummy */
95 struct pxe_context ctx;
96 struct distro_info info;
97 ulong addr;
98 int ret;
99
100 addr = map_to_sysmem(bflow->buf);
101 info.dev = dev;
102 info.bflow = bflow;
103 ret = pxe_setup_ctx(&ctx, &cmdtp, disto_getfile, &info, true,
104 bflow->subdir);
105 if (ret)
106 return log_msg_ret("ctx", -EINVAL);
107
108 ret = pxe_process(&ctx, addr, false);
109 if (ret)
110 return log_msg_ret("bread", -EINVAL);
111
112 return 0;
113}
114
115static int distro_bootmeth_bind(struct udevice *dev)
116{
117 struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);
118
119 plat->desc = IS_ENABLED(CONFIG_BOOTSTD_FULL) ?
120 "Syslinux boot from a block device" : "syslinux";
121
122 return 0;
123}
124
125static struct bootmeth_ops distro_bootmeth_ops = {
126 .check = distro_check,
127 .read_bootflow = distro_read_bootflow,
128 .read_file = bootmeth_common_read_file,
129 .boot = distro_boot,
130};
131
132static const struct udevice_id distro_bootmeth_ids[] = {
133 { .compatible = "u-boot,distro-syslinux" },
134 { }
135};
136
137U_BOOT_DRIVER(bootmeth_distro) = {
138 .name = "bootmeth_distro",
139 .id = UCLASS_BOOTMETH,
140 .of_match = distro_bootmeth_ids,
141 .ops = &distro_bootmeth_ops,
142 .bind = distro_bootmeth_bind,
143};