1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2007 Michal Simek
4 * (C) Copyright 2004 Atmark Techno, Inc.
5 *
6 * Michal SIMEK <monstr@monstr.eu>
7 * Yasushi SHOJI <yashi@atmark-techno.com>
8 */
9
10 #include <bootm.h>
11 #include <bootstage.h>
12 #include <command.h>
13 #include <cpu_func.h>
14 #include <env.h>
15 #include <fdt_support.h>
16 #include <hang.h>
17 #include <image.h>
18 #include <log.h>
19 #include <asm/cache.h>
20 #include <asm/global_data.h>
21 #include <u-boot/zlib.h>
22 #include <asm/byteorder.h>
23
24 DECLARE_GLOBAL_DATA_PTR;
25
boot_jump_linux(struct bootm_headers * images,int flag)26 static void boot_jump_linux(struct bootm_headers *images, int flag)
27 {
28 void (*thekernel)(char *cmdline, ulong rd, ulong dt);
29 ulong dt = (ulong)images->ft_addr;
30 ulong rd_start = images->initrd_start;
31 ulong cmdline = images->cmdline_start;
32 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
33
34 thekernel = (void (*)(char *, ulong, ulong))images->ep;
35
36 debug("## Transferring control to Linux (at address 0x%08lx) ",
37 (ulong)thekernel);
38 debug("cmdline 0x%08lx, ramdisk 0x%08lx, FDT 0x%08lx...\n",
39 cmdline, rd_start, dt);
40 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
41
42 printf("\nStarting kernel ...%s\n\n", fake ?
43 "(fake run for tracing)" : "");
44 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
45
46 flush_cache_all();
47
48 if (!fake) {
49 /*
50 * Linux Kernel Parameters (passing device tree):
51 * r5: pointer to command line
52 * r6: pointer to ramdisk
53 * r7: pointer to the fdt, followed by the board info data
54 */
55 thekernel((char *)cmdline, rd_start, dt);
56 /* does not return */
57 }
58 }
59
boot_prep_linux(struct bootm_headers * images)60 static void boot_prep_linux(struct bootm_headers *images)
61 {
62 if (CONFIG_IS_ENABLED(OF_LIBFDT) && IS_ENABLED(CONFIG_LMB) && images->ft_len) {
63 debug("using: FDT\n");
64 if (image_setup_linux(images)) {
65 printf("FDT creation failed! hanging...");
66 hang();
67 }
68 }
69 }
70
do_bootm_linux(int flag,struct bootm_info * bmi)71 int do_bootm_linux(int flag, struct bootm_info *bmi)
72 {
73 struct bootm_headers *images = bmi->images;
74
75 images->cmdline_start = (ulong)env_get("bootargs");
76
77 /* cmdline init is the part of 'prep' and nothing to do for 'bdt' */
78 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
79 return -1;
80
81 if (flag & BOOTM_STATE_OS_PREP) {
82 boot_prep_linux(images);
83 return 0;
84 }
85
86 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
87 boot_jump_linux(images, flag);
88 return 0;
89 }
90
91 boot_prep_linux(images);
92 boot_jump_linux(images, flag);
93 return 1;
94 }
95