1 // SPDX-License-Identifier: GPL-2.0+
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
10 #include <u-boot/zlib.h>
13 #include <environment.h>
14 #include <asm/byteorder.h>
15 #ifdef CONFIG_SHOW_BOOT_PROGRESS
16 # include <status_led.h>
19 DECLARE_GLOBAL_DATA_PTR;
23 #define LINUX_MAX_ENVS 256
24 #define LINUX_MAX_ARGS 256
26 static ulong get_sp (void);
27 static void set_clocks_in_mhz (bd_t *kbd);
29 void arch_lmb_reserve(struct lmb *lmb)
34 * Booting a (Linux) kernel image
36 * Allocate space for command line and board info - the
37 * address should be as high as possible within the reach of
38 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
39 * memory, which means far enough below the current stack
43 debug ("## Current stack ends at 0x%08lx ", sp);
45 /* adjust sp by 1K to be safe */
47 lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
50 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
54 void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
55 struct lmb *lmb = &images->lmb;
58 * allow the PREP bootm subcommand, it is required for bootm to work
60 if (flag & BOOTM_STATE_OS_PREP)
63 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
66 /* allocate space for kernel copy of board info */
67 ret = boot_get_kbd (lmb, &kbd);
69 puts("ERROR with allocation of kernel bd\n");
72 set_clocks_in_mhz(kbd);
74 ret = image_setup_linux(images);
78 kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep;
80 debug("## Transferring control to Linux (at address %08lx) ...\n",
83 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
86 * Linux Kernel Parameters (passing board info data):
87 * sp+00: Ignore, side effect of using jsr to jump to kernel
88 * sp+04: ptr to board info data
89 * sp+08: initrd_start or 0 if no initrd
90 * sp+12: initrd_end - unused if initrd_start is 0
91 * sp+16: Start of command line string
92 * sp+20: End of command line string
94 (*kernel)(kbd, images->initrd_start, images->initrd_end,
95 images->cmdline_start, images->cmdline_end);
101 static ulong get_sp (void)
105 asm("movel %%a7, %%d0\n"
106 "movel %%d0, %0\n": "=d"(sp): :"%d0");
111 static void set_clocks_in_mhz (bd_t *kbd)
115 s = env_get("clocks_in_mhz");
117 /* convert all clock information to MHz */
118 kbd->bi_intfreq /= 1000000L;
119 kbd->bi_busfreq /= 1000000L;