3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * SPDX-License-Identifier: GPL-2.0+
11 #include <u-boot/zlib.h>
14 #include <environment.h>
15 #include <asm/byteorder.h>
16 #ifdef CONFIG_SHOW_BOOT_PROGRESS
17 # include <status_led.h>
20 DECLARE_GLOBAL_DATA_PTR;
24 #define LINUX_MAX_ENVS 256
25 #define LINUX_MAX_ARGS 256
27 static ulong get_sp (void);
28 static void set_clocks_in_mhz (bd_t *kbd);
30 void arch_lmb_reserve(struct lmb *lmb)
35 * Booting a (Linux) kernel image
37 * Allocate space for command line and board info - the
38 * address should be as high as possible within the reach of
39 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
40 * memory, which means far enough below the current stack
44 debug ("## Current stack ends at 0x%08lx ", sp);
46 /* adjust sp by 1K to be safe */
48 lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
51 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
54 ulong initrd_start, initrd_end;
57 ulong cmd_start, cmd_end;
59 void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
60 struct lmb *lmb = &images->lmb;
63 * allow the PREP bootm subcommand, it is required for bootm to work
65 if (flag & BOOTM_STATE_OS_PREP)
68 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
71 /* allocate space for kernel copy of board info */
72 ret = boot_get_kbd (lmb, &kbd);
74 puts("ERROR with allocation of kernel bd\n");
77 set_clocks_in_mhz(kbd);
79 ret = image_setup_linux(images);
83 kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep;
85 debug("## Transferring control to Linux (at address %08lx) ...\n",
88 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
91 * Linux Kernel Parameters (passing board info data):
92 * sp+00: Ignore, side effect of using jsr to jump to kernel
93 * sp+04: ptr to board info data
94 * sp+08: initrd_start or 0 if no initrd
95 * sp+12: initrd_end - unused if initrd_start is 0
96 * sp+16: Start of command line string
97 * sp+20: End of command line string
99 (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
100 /* does not return */
105 static ulong get_sp (void)
109 asm("movel %%a7, %%d0\n"
110 "movel %%d0, %0\n": "=d"(sp): :"%d0");
115 static void set_clocks_in_mhz (bd_t *kbd)
119 if ((s = getenv("clocks_in_mhz")) != NULL) {
120 /* convert all clock information to MHz */
121 kbd->bi_intfreq /= 1000000L;
122 kbd->bi_busfreq /= 1000000L;