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1 /*
2  * (C) Copyright 2000-2009
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 #include <common.h>
9 #include <bootm.h>
10 #include <command.h>
11 #include <image.h>
12 #include <lmb.h>
13 #include <mapmem.h>
14 #include <linux/kernel.h>
15 #include <linux/sizes.h>
16
17 DECLARE_GLOBAL_DATA_PTR;
18
19 /* See Documentation/arm64/booting.txt in the Linux kernel */
20 struct Image_header {
21         uint32_t        code0;          /* Executable code */
22         uint32_t        code1;          /* Executable code */
23         uint64_t        text_offset;    /* Image load offset, LE */
24         uint64_t        image_size;     /* Effective Image size, LE */
25         uint64_t        flags;          /* Kernel flags, LE */
26         uint64_t        res2;           /* reserved */
27         uint64_t        res3;           /* reserved */
28         uint64_t        res4;           /* reserved */
29         uint32_t        magic;          /* Magic number */
30         uint32_t        res5;
31 };
32
33 #define LINUX_ARM64_IMAGE_MAGIC 0x644d5241
34
35 static int booti_setup(bootm_headers_t *images)
36 {
37         struct Image_header *ih;
38         uint64_t dst;
39         uint64_t image_size, text_offset;
40
41         ih = (struct Image_header *)map_sysmem(images->ep, 0);
42
43         if (ih->magic != le32_to_cpu(LINUX_ARM64_IMAGE_MAGIC)) {
44                 puts("Bad Linux ARM64 Image magic!\n");
45                 return 1;
46         }
47
48         /*
49          * Prior to Linux commit a2c1d73b94ed, the text_offset field
50          * is of unknown endianness.  In these cases, the image_size
51          * field is zero, and we can assume a fixed value of 0x80000.
52          */
53         if (ih->image_size == 0) {
54                 puts("Image lacks image_size field, assuming 16MiB\n");
55                 image_size = 16 << 20;
56                 text_offset = 0x80000;
57         } else {
58                 image_size = le64_to_cpu(ih->image_size);
59                 text_offset = le64_to_cpu(ih->text_offset);
60         }
61
62         /*
63          * If bit 3 of the flags field is set, the 2MB aligned base of the
64          * kernel image can be anywhere in physical memory, so respect
65          * images->ep.  Otherwise, relocate the image to the base of RAM
66          * since memory below it is not accessible via the linear mapping.
67          */
68         if (le64_to_cpu(ih->flags) & BIT(3))
69                 dst = images->ep - text_offset;
70         else
71                 dst = gd->bd->bi_dram[0].start;
72
73         dst = ALIGN(dst, SZ_2M) + text_offset;
74
75         unmap_sysmem(ih);
76
77         if (images->ep != dst) {
78                 void *src;
79
80                 debug("Moving Image from 0x%lx to 0x%llx\n", images->ep, dst);
81
82                 src = (void *)images->ep;
83                 images->ep = dst;
84                 memmove((void *)dst, src, image_size);
85         }
86
87         return 0;
88 }
89
90 /*
91  * Image booting support
92  */
93 static int booti_start(cmd_tbl_t *cmdtp, int flag, int argc,
94                         char * const argv[], bootm_headers_t *images)
95 {
96         int ret;
97         struct Image_header *ih;
98
99         ret = do_bootm_states(cmdtp, flag, argc, argv, BOOTM_STATE_START,
100                               images, 1);
101
102         /* Setup Linux kernel Image entry point */
103         if (!argc) {
104                 images->ep = load_addr;
105                 debug("*  kernel: default image load address = 0x%08lx\n",
106                                 load_addr);
107         } else {
108                 images->ep = simple_strtoul(argv[0], NULL, 16);
109                 debug("*  kernel: cmdline image address = 0x%08lx\n",
110                         images->ep);
111         }
112
113         ret = booti_setup(images);
114         if (ret != 0)
115                 return 1;
116
117         ih = (struct Image_header *)map_sysmem(images->ep, 0);
118
119         lmb_reserve(&images->lmb, images->ep, le32_to_cpu(ih->image_size));
120
121         unmap_sysmem(ih);
122
123         /*
124          * Handle the BOOTM_STATE_FINDOTHER state ourselves as we do not
125          * have a header that provide this informaiton.
126          */
127         if (bootm_find_images(flag, argc, argv))
128                 return 1;
129
130         return 0;
131 }
132
133 int do_booti(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
134 {
135         int ret;
136
137         /* Consume 'booti' */
138         argc--; argv++;
139
140         if (booti_start(cmdtp, flag, argc, argv, &images))
141                 return 1;
142
143         /*
144          * We are doing the BOOTM_STATE_LOADOS state ourselves, so must
145          * disable interrupts ourselves
146          */
147         bootm_disable_interrupts();
148
149         images.os.os = IH_OS_LINUX;
150         images.os.arch = IH_ARCH_ARM64;
151         ret = do_bootm_states(cmdtp, flag, argc, argv,
152 #ifdef CONFIG_SYS_BOOT_RAMDISK_HIGH
153                               BOOTM_STATE_RAMDISK |
154 #endif
155                               BOOTM_STATE_OS_PREP | BOOTM_STATE_OS_FAKE_GO |
156                               BOOTM_STATE_OS_GO,
157                               &images, 1);
158
159         return ret;
160 }
161
162 #ifdef CONFIG_SYS_LONGHELP
163 static char booti_help_text[] =
164         "[addr [initrd[:size]] [fdt]]\n"
165         "    - boot arm64 Linux Image stored in memory\n"
166         "\tThe argument 'initrd' is optional and specifies the address\n"
167         "\tof an initrd in memory. The optional parameter ':size' allows\n"
168         "\tspecifying the size of a RAW initrd.\n"
169 #if defined(CONFIG_OF_LIBFDT)
170         "\tSince booting a Linux kernel requires a flat device-tree, a\n"
171         "\tthird argument providing the address of the device-tree blob\n"
172         "\tis required. To boot a kernel with a device-tree blob but\n"
173         "\twithout an initrd image, use a '-' for the initrd argument.\n"
174 #endif
175         "";
176 #endif
177
178 U_BOOT_CMD(
179         booti,  CONFIG_SYS_MAXARGS,     1,      do_booti,
180         "boot arm64 Linux Image image from memory", booti_help_text
181 );