1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2007 Michal Simek
4 * (C) Copyright 2004 Atmark Techno, Inc.
5 *
6 * Michal SIMEK <monstr@monstr.eu>
7 * Yasushi SHOJI <yashi@atmark-techno.com>
8 */
9
10 #include <common.h>
11 #include <bootstage.h>
12 #include <command.h>
13 #include <cpu_func.h>
14 #include <env.h>
15 #include <fdt_support.h>
16 #include <hang.h>
17 #include <image.h>
18 #include <lmb.h>
19 #include <log.h>
20 #include <asm/cache.h>
21 #include <asm/global_data.h>
22 #include <u-boot/zlib.h>
23 #include <asm/byteorder.h>
24
25 DECLARE_GLOBAL_DATA_PTR;
26
get_sp(void)27 static ulong get_sp(void)
28 {
29 ulong ret;
30
31 asm("addik %0, r1, 0" : "=r"(ret) : );
32 return ret;
33 }
34
arch_lmb_reserve(struct lmb * lmb)35 void arch_lmb_reserve(struct lmb *lmb)
36 {
37 ulong sp, bank_end;
38 int bank;
39
40 /*
41 * Booting a (Linux) kernel image
42 *
43 * Allocate space for command line and board info - the
44 * address should be as high as possible within the reach of
45 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
46 * memory, which means far enough below the current stack
47 * pointer.
48 */
49 sp = get_sp();
50 debug("## Current stack ends at 0x%08lx ", sp);
51
52 /* adjust sp by 4K to be safe */
53 sp -= 4096;
54 for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
55 if (sp < gd->bd->bi_dram[bank].start)
56 continue;
57 bank_end = gd->bd->bi_dram[bank].start +
58 gd->bd->bi_dram[bank].size;
59 if (sp >= bank_end)
60 continue;
61 lmb_reserve(lmb, sp, bank_end - sp);
62 break;
63 }
64 }
65
boot_jump_linux(bootm_headers_t * images,int flag)66 static void boot_jump_linux(bootm_headers_t *images, int flag)
67 {
68 void (*thekernel)(char *cmdline, ulong rd, ulong dt);
69 ulong dt = (ulong)images->ft_addr;
70 ulong rd_start = images->initrd_start;
71 ulong cmdline = images->cmdline_start;
72 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
73
74 thekernel = (void (*)(char *, ulong, ulong))images->ep;
75
76 debug("## Transferring control to Linux (at address 0x%08lx) ",
77 (ulong)thekernel);
78 debug("cmdline 0x%08lx, ramdisk 0x%08lx, FDT 0x%08lx...\n",
79 cmdline, rd_start, dt);
80 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
81
82 printf("\nStarting kernel ...%s\n\n", fake ?
83 "(fake run for tracing)" : "");
84 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
85
86 #ifdef XILINX_USE_DCACHE
87 flush_cache(0, XILINX_DCACHE_BYTE_SIZE);
88 #endif
89
90 if (!fake) {
91 /*
92 * Linux Kernel Parameters (passing device tree):
93 * r5: pointer to command line
94 * r6: pointer to ramdisk
95 * r7: pointer to the fdt, followed by the board info data
96 */
97 thekernel((char *)cmdline, rd_start, dt);
98 /* does not return */
99 }
100 }
101
boot_prep_linux(bootm_headers_t * images)102 static void boot_prep_linux(bootm_headers_t *images)
103 {
104 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
105 debug("using: FDT\n");
106 if (image_setup_linux(images)) {
107 printf("FDT creation failed! hanging...");
108 hang();
109 }
110 }
111 }
112
do_bootm_linux(int flag,int argc,char * const argv[],bootm_headers_t * images)113 int do_bootm_linux(int flag, int argc, char *const argv[],
114 bootm_headers_t *images)
115 {
116 images->cmdline_start = (ulong)env_get("bootargs");
117
118 /* cmdline init is the part of 'prep' and nothing to do for 'bdt' */
119 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
120 return -1;
121
122 if (flag & BOOTM_STATE_OS_PREP) {
123 boot_prep_linux(images);
124 return 0;
125 }
126
127 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
128 boot_jump_linux(images, flag);
129 return 0;
130 }
131
132 boot_prep_linux(images);
133 boot_jump_linux(images, flag);
134 return 1;
135 }
136