1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
4 */
5
6 #include <bootm.h>
7 #include <bootstage.h>
8 #include <env.h>
9 #include <image.h>
10 #include <irq_func.h>
11 #include <log.h>
12 #include <asm/cache.h>
13 #include <asm/global_data.h>
14
15 DECLARE_GLOBAL_DATA_PTR;
16
cleanup_before_linux(void)17 static int cleanup_before_linux(void)
18 {
19 disable_interrupts();
20 sync_n_cleanup_cache_all();
21
22 return 0;
23 }
24
board_prep_linux(struct bootm_headers * images)25 __weak int board_prep_linux(struct bootm_headers *images) { return 0; }
26
27 /* Subcommand: PREP */
boot_prep_linux(struct bootm_headers * images)28 static int boot_prep_linux(struct bootm_headers *images)
29 {
30 int ret;
31
32 if (IS_ENABLED(CONFIG_LMB)) {
33 ret = image_setup_linux(images);
34 if (ret)
35 return ret;
36 }
37
38 return board_prep_linux(images);
39 }
40
41 /* Generic implementation for single core CPU */
board_jump_and_run(ulong entry,int zero,int arch,uint params)42 __weak void board_jump_and_run(ulong entry, int zero, int arch, uint params)
43 {
44 void (*kernel_entry)(int zero, int arch, uint params);
45
46 kernel_entry = (void (*)(int, int, uint))entry;
47
48 kernel_entry(zero, arch, params);
49 }
50
51 /* Subcommand: GO */
boot_jump_linux(struct bootm_headers * images,int flag)52 static void boot_jump_linux(struct bootm_headers *images, int flag)
53 {
54 ulong kernel_entry;
55 unsigned int r0, r2;
56 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
57
58 kernel_entry = images->ep;
59
60 debug("## Transferring control to Linux (at address %08lx)...\n",
61 kernel_entry);
62 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
63
64 printf("\nStarting kernel ...%s\n\n", fake ?
65 "(fake run for tracing)" : "");
66 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
67
68 if (CONFIG_IS_ENABLED(OF_LIBFDT) && images->ft_len) {
69 r0 = 2;
70 r2 = (unsigned int)images->ft_addr;
71 } else {
72 r0 = 1;
73 r2 = (unsigned int)env_get("bootargs");
74 }
75
76 cleanup_before_linux();
77
78 if (!fake)
79 board_jump_and_run(kernel_entry, r0, 0, r2);
80 }
81
do_bootm_linux(int flag,struct bootm_info * bmi)82 int do_bootm_linux(int flag, struct bootm_info *bmi)
83 {
84 struct bootm_headers *images = bmi->images;
85
86 /* No need for those on ARC */
87 if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE))
88 return -1;
89
90 if (flag & BOOTM_STATE_OS_PREP)
91 return boot_prep_linux(images);
92
93 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
94 boot_jump_linux(images, flag);
95 return 0;
96 }
97
98 return -1;
99 }
100