1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2003
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 */
6
7 #include <common.h>
8 #include <bootstage.h>
9 #include <command.h>
10 #include <env.h>
11 #include <image.h>
12 #include <lmb.h>
13 #include <log.h>
14 #include <asm/global_data.h>
15 #include <u-boot/zlib.h>
16 #include <bzlib.h>
17 #include <watchdog.h>
18 #include <asm/byteorder.h>
19 #ifdef CONFIG_SHOW_BOOT_PROGRESS
20 # include <status_led.h>
21 #endif
22
23 DECLARE_GLOBAL_DATA_PTR;
24
25 #define PHYSADDR(x) x
26
27 #define LINUX_MAX_ENVS 256
28 #define LINUX_MAX_ARGS 256
29
30 static ulong get_sp (void);
31 static void set_clocks_in_mhz (struct bd_info *kbd);
32
arch_lmb_reserve(struct lmb * lmb)33 void arch_lmb_reserve(struct lmb *lmb)
34 {
35 arch_lmb_reserve_generic(lmb, get_sp(), gd->ram_top, 1024);
36 }
37
do_bootm_linux(int flag,int argc,char * const argv[],struct bootm_headers * images)38 int do_bootm_linux(int flag, int argc, char *const argv[],
39 struct bootm_headers *images)
40 {
41 int ret;
42 struct bd_info *kbd;
43 void (*kernel) (struct bd_info *, ulong, ulong, ulong, ulong);
44 struct lmb *lmb = &images->lmb;
45
46 /*
47 * allow the PREP bootm subcommand, it is required for bootm to work
48 */
49 if (flag & BOOTM_STATE_OS_PREP)
50 return 0;
51
52 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
53 return 1;
54
55 /* allocate space for kernel copy of board info */
56 ret = boot_get_kbd (lmb, &kbd);
57 if (ret) {
58 puts("ERROR with allocation of kernel bd\n");
59 goto error;
60 }
61 set_clocks_in_mhz(kbd);
62
63 if (IS_ENABLED(CONFIG_LMB)) {
64 ret = image_setup_linux(images);
65 if (ret)
66 goto error;
67 }
68
69 kernel = (void (*)(struct bd_info *, ulong, ulong, ulong, ulong))images->ep;
70
71 debug("## Transferring control to Linux (at address %08lx) ...\n",
72 (ulong) kernel);
73
74 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
75
76 /*
77 * Linux Kernel Parameters (passing board info data):
78 * sp+00: Ignore, side effect of using jsr to jump to kernel
79 * sp+04: ptr to board info data
80 * sp+08: initrd_start or 0 if no initrd
81 * sp+12: initrd_end - unused if initrd_start is 0
82 * sp+16: Start of command line string
83 * sp+20: End of command line string
84 */
85 (*kernel)(kbd, images->initrd_start, images->initrd_end,
86 images->cmdline_start, images->cmdline_end);
87 /* does not return */
88 error:
89 return 1;
90 }
91
get_sp(void)92 static ulong get_sp (void)
93 {
94 ulong sp;
95
96 asm("movel %%a7, %%d0\n"
97 "movel %%d0, %0\n": "=d"(sp): :"%d0");
98
99 return sp;
100 }
101
set_clocks_in_mhz(struct bd_info * kbd)102 static void set_clocks_in_mhz (struct bd_info *kbd)
103 {
104 char *s;
105
106 s = env_get("clocks_in_mhz");
107 if (s) {
108 /* convert all clock information to MHz */
109 kbd->bi_intfreq /= 1000000L;
110 kbd->bi_busfreq /= 1000000L;
111 }
112 }
113