1 // SPDX-License-Identifier: GPL-2.0+
13 #include <u-boot/zlib.h>
16 #include <asm/byteorder.h>
17 #ifdef CONFIG_SHOW_BOOT_PROGRESS
18 # include <status_led.h>
21 DECLARE_GLOBAL_DATA_PTR;
25 #define LINUX_MAX_ENVS 256
26 #define LINUX_MAX_ARGS 256
28 static ulong get_sp (void);
29 static void set_clocks_in_mhz (bd_t *kbd);
31 void arch_lmb_reserve(struct lmb *lmb)
36 * Booting a (Linux) kernel image
38 * Allocate space for command line and board info - the
39 * address should be as high as possible within the reach of
40 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
41 * memory, which means far enough below the current stack
45 debug ("## Current stack ends at 0x%08lx ", sp);
47 /* adjust sp by 1K to be safe */
49 lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
52 int do_bootm_linux(int flag, int argc, char *const argv[],
53 bootm_headers_t *images)
57 void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
58 struct lmb *lmb = &images->lmb;
61 * allow the PREP bootm subcommand, it is required for bootm to work
63 if (flag & BOOTM_STATE_OS_PREP)
66 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
69 /* allocate space for kernel copy of board info */
70 ret = boot_get_kbd (lmb, &kbd);
72 puts("ERROR with allocation of kernel bd\n");
75 set_clocks_in_mhz(kbd);
77 ret = image_setup_linux(images);
81 kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep;
83 debug("## Transferring control to Linux (at address %08lx) ...\n",
86 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
89 * Linux Kernel Parameters (passing board info data):
90 * sp+00: Ignore, side effect of using jsr to jump to kernel
91 * sp+04: ptr to board info data
92 * sp+08: initrd_start or 0 if no initrd
93 * sp+12: initrd_end - unused if initrd_start is 0
94 * sp+16: Start of command line string
95 * sp+20: End of command line string
97 (*kernel)(kbd, images->initrd_start, images->initrd_end,
98 images->cmdline_start, images->cmdline_end);
104 static ulong get_sp (void)
108 asm("movel %%a7, %%d0\n"
109 "movel %%d0, %0\n": "=d"(sp): :"%d0");
114 static void set_clocks_in_mhz (bd_t *kbd)
118 s = env_get("clocks_in_mhz");
120 /* convert all clock information to MHz */
121 kbd->bi_intfreq /= 1000000L;
122 kbd->bi_busfreq /= 1000000L;