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