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 #include <cpu_func.h>
9 #include <env.h>
10 #include <image.h>
11 #include <irq_func.h>
12 #include <log.h>
13
14 #define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */
15
do_bootm_linux(int flag,int argc,char * const argv[],bootm_headers_t * images)16 int do_bootm_linux(int flag, int argc, char *const argv[],
17 bootm_headers_t *images)
18 {
19 void (*kernel)(int, int, int, char *) = (void *)images->ep;
20 char *commandline = env_get("bootargs");
21 ulong initrd_start = images->rd_start;
22 ulong initrd_end = images->rd_end;
23 char *of_flat_tree = NULL;
24 #if defined(CONFIG_OF_LIBFDT)
25 /* did generic code already find a device tree? */
26 if (images->ft_len)
27 of_flat_tree = images->ft_addr;
28 #endif
29 if (!of_flat_tree && argc > 1)
30 of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16);
31 if (of_flat_tree)
32 initrd_end = (ulong)of_flat_tree;
33
34 /*
35 * allow the PREP bootm subcommand, it is required for bootm to work
36 */
37 if (flag & BOOTM_STATE_OS_PREP)
38 return 0;
39
40 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
41 return 1;
42
43 /* flushes data and instruction caches before calling the kernel */
44 disable_interrupts();
45 flush_dcache_all();
46
47 debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline);
48 debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end);
49 /* kernel parameters passing
50 * r4 : NIOS magic
51 * r5 : initrd start
52 * r6 : initrd end or fdt
53 * r7 : kernel command line
54 * fdt is passed to kernel via r6, the same as initrd_end. fdt will be
55 * verified with fdt magic. when both initrd and fdt are used at the
56 * same time, fdt must follow immediately after initrd.
57 */
58 kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline);
59 /* does not return */
60
61 return 1;
62 }
63