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
15DECLARE_GLOBAL_DATA_PTR;
16
17static int cleanup_before_linux(void)
18{
19	disable_interrupts();
20	sync_n_cleanup_cache_all();
21
22	return 0;
23}
24
25__weak int board_prep_linux(struct bootm_headers *images) { return 0; }
26
27/* Subcommand: PREP */
28static 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 */
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 */
52static 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
82int 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