1 /*-
2 * Copyright (c) 2004 Olivier Houchard
3 * Copyright (c) 1994-1998 Mark Brinicombe.
4 * Copyright (c) 1994 Brini.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include "opt_platform.h"
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/ctype.h>
37 #include <sys/linker.h>
38 #include <sys/reboot.h>
39 #include <sys/sysctl.h>
40 #ifdef FDT
41 #include <sys/boot.h>
42 #endif
43
44 #include <machine/cpu.h>
45 #include <machine/machdep.h>
46 #include <machine/metadata.h>
47 #include <machine/vmparam.h>
48
49 #ifdef FDT
50 #include <contrib/libfdt/libfdt.h>
51 #include <dev/fdt/fdt_common.h>
52 #endif
53
54 extern int *end;
55 static char *loader_envp;
56 static char static_kenv[4096];
57
58 #ifdef FDT
59 #define CMDLINE_GUARD "FreeBSD:"
60 #define LBABI_MAX_COMMAND_LINE 512
61 static char linux_command_line[LBABI_MAX_COMMAND_LINE + 1];
62 #endif
63
64 /*
65 * Fake up a boot descriptor table
66 */
67 #define PRELOAD_PUSH_VALUE(type, value) do { \
68 *(type *)(preload_ptr + size) = (value); \
69 size += sizeof(type); \
70 } while (0)
71
72 #define PRELOAD_PUSH_STRING(str) do { \
73 uint32_t ssize; \
74 ssize = strlen(str) + 1; \
75 PRELOAD_PUSH_VALUE(uint32_t, ssize); \
76 strcpy((char*)(preload_ptr + size), str); \
77 size += ssize; \
78 size = roundup(size, sizeof(u_long)); \
79 } while (0)
80
81 /* Build minimal set of metatda. */
82 static vm_offset_t
fake_preload_metadata(void * dtb_ptr,size_t dtb_size)83 fake_preload_metadata(void *dtb_ptr, size_t dtb_size)
84 {
85 vm_offset_t lastaddr;
86 static char fake_preload[256];
87 caddr_t preload_ptr;
88 size_t size;
89
90 lastaddr = (vm_offset_t)&end;
91 preload_ptr = (caddr_t)&fake_preload[0];
92 size = 0;
93
94 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_NAME);
95 PRELOAD_PUSH_STRING("kernel");
96
97 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_TYPE);
98 PRELOAD_PUSH_STRING("elf kernel");
99
100 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_ADDR);
101 PRELOAD_PUSH_VALUE(uint32_t, sizeof(vm_offset_t));
102 PRELOAD_PUSH_VALUE(uint64_t, VM_MIN_KERNEL_ADDRESS);
103
104 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_SIZE);
105 PRELOAD_PUSH_VALUE(uint32_t, sizeof(size_t));
106 PRELOAD_PUSH_VALUE(uint64_t, (size_t)(&end - VM_MIN_KERNEL_ADDRESS));
107
108 if (dtb_ptr != NULL) {
109 /* Copy DTB to KVA space and insert it into module chain. */
110 lastaddr = roundup(lastaddr, sizeof(int));
111 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_METADATA | MODINFOMD_DTBP);
112 PRELOAD_PUSH_VALUE(uint32_t, sizeof(uint64_t));
113 PRELOAD_PUSH_VALUE(uint64_t, (uint64_t)lastaddr);
114 memmove((void *)lastaddr, dtb_ptr, dtb_size);
115 lastaddr += dtb_size;
116 lastaddr = roundup(lastaddr, sizeof(int));
117 }
118 /* End marker */
119 PRELOAD_PUSH_VALUE(uint32_t, 0);
120 PRELOAD_PUSH_VALUE(uint32_t, 0);
121
122 preload_metadata = (caddr_t)(uintptr_t)fake_preload;
123
124 init_static_kenv(NULL, 0);
125
126 return (lastaddr);
127 }
128
129 #ifdef FDT
130
131 /* Convert the U-Boot command line into FreeBSD kenv and boot options. */
132 static void
cmdline_set_env(char * cmdline,const char * guard)133 cmdline_set_env(char *cmdline, const char *guard)
134 {
135 size_t guard_len;
136
137 /* Skip leading spaces. */
138 while (isspace(*cmdline))
139 cmdline++;
140
141 /* Test and remove guard. */
142 if (guard != NULL && guard[0] != '\0') {
143 guard_len = strlen(guard);
144 if (strncasecmp(cmdline, guard, guard_len) != 0)
145 return;
146 cmdline += guard_len;
147 }
148
149 boothowto |= boot_parse_cmdline(cmdline);
150 }
151
152 void
parse_fdt_bootargs(void)153 parse_fdt_bootargs(void)
154 {
155
156 if (loader_envp == NULL && fdt_get_chosen_bootargs(linux_command_line,
157 LBABI_MAX_COMMAND_LINE) == 0) {
158 init_static_kenv(static_kenv, sizeof(static_kenv));
159 cmdline_set_env(linux_command_line, CMDLINE_GUARD);
160 }
161 }
162
163 #endif
164
165 #if defined(LINUX_BOOT_ABI) && defined(FDT)
166 static vm_offset_t
linux_parse_boot_param(struct arm64_bootparams * abp)167 linux_parse_boot_param(struct arm64_bootparams *abp)
168 {
169 struct fdt_header *dtb_ptr;
170 size_t dtb_size;
171
172 if (abp->modulep == 0)
173 return (0);
174 /* Test if modulep point to valid DTB. */
175 dtb_ptr = (struct fdt_header *)abp->modulep;
176 if (fdt_check_header(dtb_ptr) != 0)
177 return (0);
178 dtb_size = fdt_totalsize(dtb_ptr);
179 return (fake_preload_metadata(dtb_ptr, dtb_size));
180 }
181
182 #endif
183
184 static vm_offset_t
freebsd_parse_boot_param(struct arm64_bootparams * abp)185 freebsd_parse_boot_param(struct arm64_bootparams *abp)
186 {
187 vm_offset_t lastaddr = 0;
188 void *kmdp;
189 #ifdef DDB
190 vm_offset_t ksym_start;
191 vm_offset_t ksym_end;
192 #endif
193
194 if (abp->modulep == 0)
195 return (0);
196
197 preload_metadata = (caddr_t)(uintptr_t)(abp->modulep);
198 kmdp = preload_search_by_type("elf kernel");
199 if (kmdp == NULL)
200 return (0);
201
202 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
203 loader_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
204 init_static_kenv(loader_envp, 0);
205 lastaddr = MD_FETCH(kmdp, MODINFOMD_KERNEND, vm_offset_t);
206 #ifdef DDB
207 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
208 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
209 db_fetch_ksymtab(ksym_start, ksym_end, 0);
210 #endif
211 return (lastaddr);
212 }
213
214 vm_offset_t
parse_boot_param(struct arm64_bootparams * abp)215 parse_boot_param(struct arm64_bootparams *abp)
216 {
217 vm_offset_t lastaddr;
218
219 #if defined(LINUX_BOOT_ABI) && defined(FDT)
220 lastaddr = linux_parse_boot_param(abp);
221 if (lastaddr != 0)
222 return (lastaddr);
223 #endif
224 lastaddr = freebsd_parse_boot_param(abp);
225 if (lastaddr != 0)
226 return (lastaddr);
227
228 /* Fall back to hardcoded metadata. */
229 lastaddr = fake_preload_metadata(NULL, 0);
230
231 return (lastaddr);
232 }
233