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