1 /*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28
29 #include <stand.h>
30 #include <sys/param.h>
31 #include <sys/reboot.h>
32 #include <sys/linker.h>
33 #include <machine/bootinfo.h>
34 #include <machine/cpufunc.h>
35 #include <machine/metadata.h>
36 #include <machine/psl.h>
37 #include <machine/specialreg.h>
38 #include "bootstrap.h"
39 #include "libi386.h"
40 #include "btxv86.h"
41
42 /*
43 * Copy module-related data into the load area, where it can be
44 * used as a directory for loaded modules.
45 *
46 * Module data is presented in a self-describing format. Each datum
47 * is preceded by a 32-bit identifier and a 32-bit size field.
48 *
49 * Currently, the following data are saved:
50 *
51 * MOD_NAME (variable) module name (string)
52 * MOD_TYPE (variable) module type (string)
53 * MOD_ARGS (variable) module parameters (string)
54 * MOD_ADDR sizeof(vm_offset_t) module load address
55 * MOD_SIZE sizeof(size_t) module size
56 * MOD_METADATA (variable) type-specific metadata
57 */
58 #define COPY32(v, a, c) { \
59 u_int32_t x = (v); \
60 if (c) \
61 i386_copyin(&x, a, sizeof(x)); \
62 a += sizeof(x); \
63 }
64
65 #define MOD_STR(t, a, s, c) { \
66 COPY32(t, a, c); \
67 COPY32(strlen(s) + 1, a, c); \
68 if (c) \
69 i386_copyin(s, a, strlen(s) + 1); \
70 a += roundup(strlen(s) + 1, sizeof(u_int64_t));\
71 }
72
73 #define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c)
74 #define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c)
75 #define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c)
76
77 #define MOD_VAR(t, a, s, c) { \
78 COPY32(t, a, c); \
79 COPY32(sizeof(s), a, c); \
80 if (c) \
81 i386_copyin(&s, a, sizeof(s)); \
82 a += roundup(sizeof(s), sizeof(u_int64_t)); \
83 }
84
85 #define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c)
86 #define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c)
87
88 #define MOD_METADATA(a, mm, c) { \
89 COPY32(MODINFO_METADATA | mm->md_type, a, c); \
90 COPY32(mm->md_size, a, c); \
91 if (c) \
92 i386_copyin(mm->md_data, a, mm->md_size); \
93 a += roundup(mm->md_size, sizeof(u_int64_t));\
94 }
95
96 #define MOD_END(a, c) { \
97 COPY32(MODINFO_END, a, c); \
98 COPY32(0, a, c); \
99 }
100
101 static vm_offset_t
bi_copymodules64(vm_offset_t addr)102 bi_copymodules64(vm_offset_t addr)
103 {
104 struct preloaded_file *fp;
105 struct file_metadata *md;
106 int c;
107 u_int64_t v;
108
109 c = addr != 0;
110 /* start with the first module on the list, should be the kernel */
111 for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
112
113 MOD_NAME(addr, fp->f_name, c); /* this field must come first */
114 MOD_TYPE(addr, fp->f_type, c);
115 if (fp->f_args)
116 MOD_ARGS(addr, fp->f_args, c);
117 v = fp->f_addr;
118 MOD_ADDR(addr, v, c);
119 v = fp->f_size;
120 MOD_SIZE(addr, v, c);
121 for (md = fp->f_metadata; md != NULL; md = md->md_next)
122 if (!(md->md_type & MODINFOMD_NOCOPY))
123 MOD_METADATA(addr, md, c);
124 }
125 MOD_END(addr, c);
126 return(addr);
127 }
128
129 /*
130 * Load the information expected by an amd64 kernel.
131 *
132 * - The 'boothowto' argument is constructed
133 * - The 'bootdev' argument is constructed
134 * - The 'bootinfo' struct is constructed, and copied into the kernel space.
135 * - The kernel environment is copied into kernel space.
136 * - Module metadata are formatted and placed in kernel space.
137 */
138 int
bi_load64(char * args,vm_offset_t addr,vm_offset_t * modulep,vm_offset_t * kernendp,int add_smap)139 bi_load64(char *args, vm_offset_t addr, vm_offset_t *modulep,
140 vm_offset_t *kernendp, int add_smap)
141 {
142 struct preloaded_file *xp, *kfp;
143 struct i386_devdesc *rootdev;
144 struct file_metadata *md;
145 u_int64_t kernend;
146 u_int64_t envp;
147 u_int64_t module;
148 vm_offset_t size;
149 char *rootdevname;
150 int howto;
151
152 if (!bi_checkcpu()) {
153 printf("CPU doesn't support long mode\n");
154 return (EINVAL);
155 }
156
157 howto = bi_getboothowto(args);
158
159 /*
160 * Allow the environment variable 'rootdev' to override the supplied device
161 * This should perhaps go to MI code and/or have $rootdev tested/set by
162 * MI code before launching the kernel.
163 */
164 rootdevname = getenv("rootdev");
165 i386_getdev((void **)(&rootdev), rootdevname, NULL);
166 if (rootdev == NULL) { /* bad $rootdev/$currdev */
167 printf("can't determine root device\n");
168 return(EINVAL);
169 }
170
171 /* Try reading the /etc/fstab file to select the root device */
172 getrootmount(i386_fmtdev((void *)rootdev));
173
174 if (addr == 0) {
175 /* find the last module in the chain */
176 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
177 if (addr < (xp->f_addr + xp->f_size))
178 addr = xp->f_addr + xp->f_size;
179 }
180 }
181 /* pad to a page boundary */
182 addr = roundup(addr, PAGE_SIZE);
183
184 /* place the metadata before anything */
185 module = *modulep = addr;
186
187 kfp = file_findfile(NULL, "elf kernel");
188 if (kfp == NULL)
189 kfp = file_findfile(NULL, "elf64 kernel");
190 if (kfp == NULL)
191 panic("can't find kernel file");
192 kernend = 0; /* fill it in later */
193 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
194 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
195 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
196 file_addmetadata(kfp, MODINFOMD_MODULEP, sizeof module, &module);
197 if (add_smap != 0)
198 bios_addsmapdata(kfp);
199
200 size = bi_copymodules64(0);
201
202 /* copy our environment */
203 envp = roundup(addr + size, PAGE_SIZE);
204 addr = bi_copyenv(envp);
205
206 /* set kernend */
207 kernend = roundup(addr, PAGE_SIZE);
208 *kernendp = kernend;
209
210 /* patch MODINFOMD_KERNEND */
211 md = file_findmetadata(kfp, MODINFOMD_KERNEND);
212 bcopy(&kernend, md->md_data, sizeof kernend);
213
214 /* patch MODINFOMD_ENVP */
215 md = file_findmetadata(kfp, MODINFOMD_ENVP);
216 bcopy(&envp, md->md_data, sizeof envp);
217
218 /* copy module list and metadata */
219 (void)bi_copymodules64(*modulep);
220
221 return(0);
222 }
223