jcs.org
"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2019 Fraunhofer AISEC,
4 * Lukas Auer <lukas.auer@aisec.fraunhofer.de>
5 *
6 * Based on common/spl/spl_atf.c
7 */
8#include <cpu_func.h>
9#include <errno.h>
10#include <hang.h>
11#include <image.h>
12#include <spl.h>
13#include <asm/global_data.h>
14#include <asm/smp.h>
15#include <opensbi.h>
16#include <linux/libfdt.h>
17#include <linux/printk.h>
18#include <mapmem.h>
19
20DECLARE_GLOBAL_DATA_PTR;
21
22struct fw_dynamic_info opensbi_info;
23
24static int spl_opensbi_find_os_node(void *blob, int *uboot_node, int os_type)
25{
26 int fit_images_node, node;
27 const char *fit_os;
28
29 fit_images_node = fdt_path_offset(blob, "/fit-images");
30 if (fit_images_node < 0)
31 return -ENODEV;
32
33 fdt_for_each_subnode(node, blob, fit_images_node) {
34 fit_os = fdt_getprop(blob, node, FIT_OS_PROP, NULL);
35 if (!fit_os)
36 continue;
37
38 if (genimg_get_os_id(fit_os) == os_type) {
39 *uboot_node = node;
40 return 0;
41 }
42 }
43
44 return -ENODEV;
45}
46
47void __noreturn spl_invoke_opensbi(struct spl_image_info *spl_image)
48{
49 int ret, os_node;
50 ulong os_entry;
51 int os_type;
52 typedef void __noreturn (*opensbi_entry_t)(ulong hartid, ulong dtb, ulong info);
53 opensbi_entry_t opensbi_entry;
54
55 if (!spl_image->fdt_addr) {
56 pr_err("No device tree specified in SPL image\n");
57 hang();
58 }
59
60 /*
61 * Originally, u-boot-spl will place DTB directly after the kernel,
62 * but the size of the kernel did not include the BSS section, which
63 * means u-boot-spl will place the DTB in the kernel BSS section
64 * causing the DTB to be cleared by kernel BSS initializtion.
65 * Moving DTB in front of the kernel can avoid the error.
66 */
67#if CONFIG_IS_ENABLED(LOAD_FIT_OPENSBI_OS_BOOT) && \
68 CONFIG_VAL(PAYLOAD_ARGS_ADDR)
69 memcpy((void *)CONFIG_SPL_PAYLOAD_ARGS_ADDR, spl_image->fdt_addr,
70 fdt_totalsize(spl_image->fdt_addr));
71 spl_image->fdt_addr = map_sysmem(CONFIG_SPL_PAYLOAD_ARGS_ADDR, 0);
72#endif
73
74 /*
75 * Find next os image in /fit-images
76 * The next os image default is u-boot proper, once enable
77 * OpenSBI OS boot mode, the OS image should be linux.
78 */
79 if (CONFIG_IS_ENABLED(LOAD_FIT_OPENSBI_OS_BOOT))
80 os_type = IH_OS_LINUX;
81 else
82 os_type = IH_OS_U_BOOT;
83
84 ret = spl_opensbi_find_os_node(spl_image->fdt_addr, &os_node, os_type);
85 if (ret) {
86 pr_err("Can't find %s node for opensbi, %d\n",
87 genimg_get_os_name(os_type), ret);
88 hang();
89 }
90
91 /* Get U-Boot entry point */
92 ret = fit_image_get_entry(spl_image->fdt_addr, os_node, &os_entry);
93 if (ret)
94 ret = fit_image_get_load(spl_image->fdt_addr, os_node, &os_entry);
95
96 /* Prepare opensbi_info object */
97 opensbi_info.magic = FW_DYNAMIC_INFO_MAGIC_VALUE;
98 opensbi_info.version = FW_DYNAMIC_INFO_VERSION;
99 opensbi_info.next_addr = os_entry;
100 opensbi_info.next_mode = FW_DYNAMIC_INFO_NEXT_MODE_S;
101 opensbi_info.options = CONFIG_SPL_OPENSBI_SCRATCH_OPTIONS;
102 opensbi_info.boot_hart = gd->arch.boot_hart;
103
104 opensbi_entry = (opensbi_entry_t)spl_image->entry_point;
105 invalidate_icache_all();
106
107#ifdef CONFIG_SPL_SMP
108 /*
109 * Start OpenSBI on all secondary harts and wait for acknowledgment.
110 *
111 * OpenSBI first relocates itself to its link address. This is done by
112 * the main hart. To make sure no hart is still running U-Boot SPL
113 * during relocation, we wait for all secondary harts to acknowledge
114 * the call-function request before entering OpenSBI on the main hart.
115 * Otherwise, code corruption can occur if the link address ranges of
116 * U-Boot SPL and OpenSBI overlap.
117 */
118 ret = smp_call_function((ulong)spl_image->entry_point,
119 (ulong)spl_image->fdt_addr,
120 (ulong)&opensbi_info, 1);
121 if (ret)
122 hang();
123#endif
124 opensbi_entry(gd->arch.boot_hart, (ulong)spl_image->fdt_addr,
125 (ulong)&opensbi_info);
126}