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