1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
4 */
5
6 #include <common.h>
7 #include <bootstage.h>
8 #include <env.h>
9 #include <image.h>
10 #include <irq_func.h>
11 #include <lmb.h>
12 #include <log.h>
13 #include <asm/cache.h>
14 #include <asm/global_data.h>
15
16 DECLARE_GLOBAL_DATA_PTR;
17
get_sp(void)18 static ulong get_sp(void)
19 {
20 ulong ret;
21
22 asm("mov %0, sp" : "=r"(ret) : );
23 return ret;
24 }
25
arch_lmb_reserve(struct lmb * lmb)26 void arch_lmb_reserve(struct lmb *lmb)
27 {
28 ulong sp;
29
30 /*
31 * Booting a (Linux) kernel image
32 *
33 * Allocate space for command line and board info - the
34 * address should be as high as possible within the reach of
35 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
36 * memory, which means far enough below the current stack
37 * pointer.
38 */
39 sp = get_sp();
40 debug("## Current stack ends at 0x%08lx ", sp);
41
42 /* adjust sp by 4K to be safe */
43 sp -= 4096;
44 lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
45 }
46
cleanup_before_linux(void)47 static int cleanup_before_linux(void)
48 {
49 disable_interrupts();
50 sync_n_cleanup_cache_all();
51
52 return 0;
53 }
54
board_prep_linux(bootm_headers_t * images)55 __weak int board_prep_linux(bootm_headers_t *images) { return 0; }
56
57 /* Subcommand: PREP */
boot_prep_linux(bootm_headers_t * images)58 static int boot_prep_linux(bootm_headers_t *images)
59 {
60 int ret;
61
62 ret = image_setup_linux(images);
63 if (ret)
64 return ret;
65
66 return board_prep_linux(images);
67 }
68
69 /* Generic implementation for single core CPU */
board_jump_and_run(ulong entry,int zero,int arch,uint params)70 __weak void board_jump_and_run(ulong entry, int zero, int arch, uint params)
71 {
72 void (*kernel_entry)(int zero, int arch, uint params);
73
74 kernel_entry = (void (*)(int, int, uint))entry;
75
76 kernel_entry(zero, arch, params);
77 }
78
79 /* Subcommand: GO */
boot_jump_linux(bootm_headers_t * images,int flag)80 static void boot_jump_linux(bootm_headers_t *images, int flag)
81 {
82 ulong kernel_entry;
83 unsigned int r0, r2;
84 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
85
86 kernel_entry = images->ep;
87
88 debug("## Transferring control to Linux (at address %08lx)...\n",
89 kernel_entry);
90 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
91
92 printf("\nStarting kernel ...%s\n\n", fake ?
93 "(fake run for tracing)" : "");
94 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
95
96 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
97 r0 = 2;
98 r2 = (unsigned int)images->ft_addr;
99 } else {
100 r0 = 1;
101 r2 = (unsigned int)env_get("bootargs");
102 }
103
104 cleanup_before_linux();
105
106 if (!fake)
107 board_jump_and_run(kernel_entry, r0, 0, r2);
108 }
109
do_bootm_linux(int flag,int argc,char * argv[],bootm_headers_t * images)110 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
111 {
112 /* No need for those on ARC */
113 if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE))
114 return -1;
115
116 if (flag & BOOTM_STATE_OS_PREP)
117 return boot_prep_linux(images);
118
119 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
120 boot_jump_linux(images, flag);
121 return 0;
122 }
123
124 return -1;
125 }
126