1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
4 * Scott McNutt <smcnutt@psyent.com>
5 */
6
7 #include <common.h>
8
9 #define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */
10
do_bootm_linux(int flag,int argc,char * const argv[],bootm_headers_t * images)11 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
12 {
13 void (*kernel)(int, int, int, char *) = (void *)images->ep;
14 char *commandline = env_get("bootargs");
15 ulong initrd_start = images->rd_start;
16 ulong initrd_end = images->rd_end;
17 char *of_flat_tree = NULL;
18 #if defined(CONFIG_OF_LIBFDT)
19 /* did generic code already find a device tree? */
20 if (images->ft_len)
21 of_flat_tree = images->ft_addr;
22 #endif
23 if (!of_flat_tree && argc > 1)
24 of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16);
25 if (of_flat_tree)
26 initrd_end = (ulong)of_flat_tree;
27
28 /*
29 * allow the PREP bootm subcommand, it is required for bootm to work
30 */
31 if (flag & BOOTM_STATE_OS_PREP)
32 return 0;
33
34 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
35 return 1;
36
37 /* flushes data and instruction caches before calling the kernel */
38 disable_interrupts();
39 flush_dcache_all();
40
41 debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline);
42 debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end);
43 /* kernel parameters passing
44 * r4 : NIOS magic
45 * r5 : initrd start
46 * r6 : initrd end or fdt
47 * r7 : kernel command line
48 * fdt is passed to kernel via r6, the same as initrd_end. fdt will be
49 * verified with fdt magic. when both initrd and fdt are used at the
50 * same time, fdt must follow immediately after initrd.
51 */
52 kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline);
53 /* does not return */
54
55 return 1;
56 }
57