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 #include <asm/global_data.h>
14
15 DECLARE_GLOBAL_DATA_PTR;
16
17 #define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */
18
do_bootm_linux(int flag,int argc,char * const argv[],bootm_headers_t * images)19 int do_bootm_linux(int flag, int argc, char *const argv[],
20 bootm_headers_t *images)
21 {
22 void (*kernel)(int, int, int, char *) = (void *)images->ep;
23 char *commandline = env_get("bootargs");
24 ulong initrd_start = images->rd_start;
25 ulong initrd_end = images->rd_end;
26 char *of_flat_tree = NULL;
27 #if defined(CONFIG_OF_LIBFDT)
28 /* did generic code already find a device tree? */
29 if (images->ft_len)
30 of_flat_tree = images->ft_addr;
31 #endif
32 if (!of_flat_tree && argc > 1)
33 of_flat_tree = (char *)hextoul(argv[1], NULL);
34 if (of_flat_tree)
35 initrd_end = (ulong)of_flat_tree;
36
37 /*
38 * allow the PREP bootm subcommand, it is required for bootm to work
39 */
40 if (flag & BOOTM_STATE_OS_PREP)
41 return 0;
42
43 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
44 return 1;
45
46 /* flushes data and instruction caches before calling the kernel */
47 disable_interrupts();
48 flush_dcache_all();
49
50 debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline);
51 debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end);
52 /* kernel parameters passing
53 * r4 : NIOS magic
54 * r5 : initrd start
55 * r6 : initrd end or fdt
56 * r7 : kernel command line
57 * fdt is passed to kernel via r6, the same as initrd_end. fdt will be
58 * verified with fdt magic. when both initrd and fdt are used at the
59 * same time, fdt must follow immediately after initrd.
60 */
61 kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline);
62 /* does not return */
63
64 return 1;
65 }
66
get_sp(void)67 static ulong get_sp(void)
68 {
69 ulong ret;
70
71 asm("mov %0, sp" : "=r"(ret) : );
72 return ret;
73 }
74
arch_lmb_reserve(struct lmb * lmb)75 void arch_lmb_reserve(struct lmb *lmb)
76 {
77 arch_lmb_reserve_generic(lmb, get_sp(), gd->ram_top, 4096);
78 }
79