1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
4 */
5
6 #include <asm/cache.h>
7 #include <common.h>
8
9 DECLARE_GLOBAL_DATA_PTR;
10
get_sp(void)11 static ulong get_sp(void)
12 {
13 ulong ret;
14
15 asm("mov %0, sp" : "=r"(ret) : );
16 return ret;
17 }
18
arch_lmb_reserve(struct lmb * lmb)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
cleanup_before_linux(void)40 static int cleanup_before_linux(void)
41 {
42 disable_interrupts();
43 sync_n_cleanup_cache_all();
44
45 return 0;
46 }
47
board_prep_linux(bootm_headers_t * images)48 __weak int board_prep_linux(bootm_headers_t *images) { return 0; }
49
50 /* Subcommand: PREP */
boot_prep_linux(bootm_headers_t * images)51 static int boot_prep_linux(bootm_headers_t *images)
52 {
53 int ret;
54
55 ret = image_setup_linux(images);
56 if (ret)
57 return ret;
58
59 return board_prep_linux(images);
60 }
61
62 /* Generic implementation for single core CPU */
board_jump_and_run(ulong entry,int zero,int arch,uint params)63 __weak void board_jump_and_run(ulong entry, int zero, int arch, uint params)
64 {
65 void (*kernel_entry)(int zero, int arch, uint params);
66
67 kernel_entry = (void (*)(int, int, uint))entry;
68
69 kernel_entry(zero, arch, params);
70 }
71
72 /* Subcommand: GO */
boot_jump_linux(bootm_headers_t * images,int flag)73 static void boot_jump_linux(bootm_headers_t *images, int flag)
74 {
75 ulong kernel_entry;
76 unsigned int r0, r2;
77 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
78
79 kernel_entry = images->ep;
80
81 debug("## Transferring control to Linux (at address %08lx)...\n",
82 kernel_entry);
83 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
84
85 printf("\nStarting kernel ...%s\n\n", fake ?
86 "(fake run for tracing)" : "");
87 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
88
89 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
90 r0 = 2;
91 r2 = (unsigned int)images->ft_addr;
92 } else {
93 r0 = 1;
94 r2 = (unsigned int)env_get("bootargs");
95 }
96
97 cleanup_before_linux();
98
99 if (!fake)
100 board_jump_and_run(kernel_entry, r0, 0, r2);
101 }
102
do_bootm_linux(int flag,int argc,char * argv[],bootm_headers_t * images)103 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
104 {
105 /* No need for those on ARC */
106 if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE))
107 return -1;
108
109 if (flag & BOOTM_STATE_OS_PREP)
110 return boot_prep_linux(images);
111
112 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
113 boot_jump_linux(images, flag);
114 return 0;
115 }
116
117 return -1;
118 }
119