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Commit | Line | Data |
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22723828 AB |
1 | /* |
2 | * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0+ | |
5 | */ | |
6 | ||
7 | #include <common.h> | |
8 | ||
9 | DECLARE_GLOBAL_DATA_PTR; | |
10 | ||
11 | static ulong get_sp(void) | |
12 | { | |
13 | ulong ret; | |
14 | ||
15 | asm("mov %0, sp" : "=r"(ret) : ); | |
16 | return ret; | |
17 | } | |
18 | ||
19 | void arch_lmb_reserve(struct lmb *lmb) | |
20 | { | |
21 | ulong sp; | |
22 | ||
23 | /* | |
24 | * Booting a (Linux) kernel image | |
25 | * | |
26 | * Allocate space for command line and board info - the | |
27 | * address should be as high as possible within the reach of | |
28 | * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused | |
29 | * memory, which means far enough below the current stack | |
30 | * pointer. | |
31 | */ | |
32 | sp = get_sp(); | |
33 | debug("## Current stack ends at 0x%08lx ", sp); | |
34 | ||
35 | /* adjust sp by 4K to be safe */ | |
36 | sp -= 4096; | |
37 | lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp)); | |
38 | } | |
39 | ||
40 | static int cleanup_before_linux(void) | |
41 | { | |
42 | disable_interrupts(); | |
43 | flush_dcache_all(); | |
44 | invalidate_icache_all(); | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
49 | /* Subcommand: PREP */ | |
50 | static void boot_prep_linux(bootm_headers_t *images) | |
51 | { | |
52 | if (image_setup_linux(images)) | |
53 | hang(); | |
54 | } | |
55 | ||
56 | /* Subcommand: GO */ | |
57 | static void boot_jump_linux(bootm_headers_t *images, int flag) | |
58 | { | |
59 | void (*kernel_entry)(int zero, int arch, uint params); | |
60 | unsigned int r0, r2; | |
61 | int fake = (flag & BOOTM_STATE_OS_FAKE_GO); | |
62 | ||
63 | kernel_entry = (void (*)(int, int, uint))images->ep; | |
64 | ||
65 | debug("## Transferring control to Linux (at address %08lx)...\n", | |
66 | (ulong) kernel_entry); | |
67 | bootstage_mark(BOOTSTAGE_ID_RUN_OS); | |
68 | ||
69 | printf("\nStarting kernel ...%s\n\n", fake ? | |
70 | "(fake run for tracing)" : ""); | |
71 | bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); | |
72 | ||
73 | cleanup_before_linux(); | |
74 | ||
75 | if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { | |
76 | r0 = 2; | |
77 | r2 = (unsigned int)images->ft_addr; | |
78 | } else { | |
79 | r0 = 1; | |
80 | r2 = (unsigned int)getenv("bootargs"); | |
81 | } | |
82 | ||
83 | if (!fake) | |
84 | kernel_entry(r0, 0, r2); | |
85 | } | |
86 | ||
87 | int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) | |
88 | { | |
89 | /* No need for those on ARC */ | |
90 | if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE)) | |
91 | return -1; | |
92 | ||
93 | if (flag & BOOTM_STATE_OS_PREP) { | |
94 | boot_prep_linux(images); | |
95 | return 0; | |
96 | } | |
97 | ||
98 | if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { | |
99 | boot_jump_linux(images, flag); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | boot_prep_linux(images); | |
104 | boot_jump_linux(images, flag); | |
105 | return 0; | |
106 | } |