Remove bogus (void *) casts.
[dragonfly.git] / sys / boot / pc32 / libi386 / bootinfo32.c
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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 * $FreeBSD: src/sys/boot/i386/libi386/bootinfo32.c,v 1.36 2003/08/25 23:28:31 obrien Exp $
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27 */
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 "bootstrap.h"
35#include "libi386.h"
36#include "btxv86.h"
37
38static struct bootinfo bi;
39
40/*
41 * Copy module-related data into the load area, where it can be
42 * used as a directory for loaded modules.
43 *
44 * Module data is presented in a self-describing format. Each datum
45 * is preceded by a 32-bit identifier and a 32-bit size field.
46 *
47 * Currently, the following data are saved:
48 *
49 * MOD_NAME (variable) module name (string)
50 * MOD_TYPE (variable) module type (string)
51 * MOD_ARGS (variable) module parameters (string)
52 * MOD_ADDR sizeof(vm_offset_t) module load address
53 * MOD_SIZE sizeof(size_t) module size
54 * MOD_METADATA (variable) type-specific metadata
55 */
56#define COPY32(v, a, c) { \
57 u_int32_t x = (v); \
58 if (c) \
59 i386_copyin(&x, a, sizeof(x)); \
60 a += sizeof(x); \
61}
62
63#define MOD_STR(t, a, s, c) { \
64 COPY32(t, a, c); \
65 COPY32(strlen(s) + 1, a, c); \
66 if (c) \
67 i386_copyin(s, a, strlen(s) + 1); \
68 a += roundup(strlen(s) + 1, sizeof(u_long));\
69}
70
71#define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c)
72#define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c)
73#define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c)
74
75#define MOD_VAR(t, a, s, c) { \
76 COPY32(t, a, c); \
77 COPY32(sizeof(s), a, c); \
78 if (c) \
79 i386_copyin(&s, a, sizeof(s)); \
80 a += roundup(sizeof(s), sizeof(u_long)); \
81}
82
83#define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c)
84#define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c)
85
86#define MOD_METADATA(a, mm, c) { \
87 COPY32(MODINFO_METADATA | mm->md_type, a, c); \
88 COPY32(mm->md_size, a, c); \
89 if (c) \
90 i386_copyin(mm->md_data, a, mm->md_size); \
91 a += roundup(mm->md_size, sizeof(u_long));\
92}
93
94#define MOD_END(a, c) { \
95 COPY32(MODINFO_END, a, c); \
96 COPY32(0, a, c); \
97}
98
99static vm_offset_t
100bi_copymodules32(vm_offset_t addr)
101{
102 struct preloaded_file *fp;
103 struct file_metadata *md;
104 int c;
105
106 c = addr != 0;
107 /* start with the first module on the list, should be the kernel */
108 for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
109
110 MOD_NAME(addr, fp->f_name, c); /* this field must come first */
111 MOD_TYPE(addr, fp->f_type, c);
112 if (fp->f_args)
113 MOD_ARGS(addr, fp->f_args, c);
114 MOD_ADDR(addr, fp->f_addr, c);
115 MOD_SIZE(addr, fp->f_size, c);
116 for (md = fp->f_metadata; md != NULL; md = md->md_next)
117 if (!(md->md_type & MODINFOMD_NOCOPY))
118 MOD_METADATA(addr, md, c);
119 }
120 MOD_END(addr, c);
121 return(addr);
122}
123
124/*
125 * Load the information expected by an i386 kernel.
126 *
127 * - The 'boothowto' argument is constructed
128 * - The 'bootdev' argument is constructed
129 * - The 'bootinfo' struct is constructed, and copied into the kernel space.
130 * - The kernel environment is copied into kernel space.
131 * - Module metadata are formatted and placed in kernel space.
132 */
133int
134bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp)
135{
136 struct preloaded_file *xp, *kfp;
137 struct i386_devdesc *rootdev;
138 struct file_metadata *md;
139 vm_offset_t addr;
140 vm_offset_t kernend;
141 vm_offset_t envp;
142 vm_offset_t size;
143 vm_offset_t ssym, esym;
144 char *rootdevname;
145 int bootdevnr, i, howto;
146 char *kernelname;
147 const char *kernelpath;
148
149 howto = bi_getboothowto(args);
150
151 /*
152 * Allow the environment variable 'rootdev' to override the supplied device
153 * This should perhaps go to MI code and/or have $rootdev tested/set by
154 * MI code before launching the kernel.
155 */
156 rootdevname = getenv("rootdev");
157 i386_getdev((void **)(&rootdev), rootdevname, NULL);
158 if (rootdev == NULL) { /* bad $rootdev/$currdev */
159 printf("can't determine root device\n");
160 return(EINVAL);
161 }
162
163 /* Try reading the /etc/fstab file to select the root device */
4e1af74f 164 getrootmount(i386_fmtdev(rootdev));
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165
166 /* Do legacy rootdev guessing */
167
168 /* XXX - use a default bootdev of 0. Is this ok??? */
169 bootdevnr = 0;
170
171 switch(rootdev->d_type) {
172 case DEVT_CD:
173 /* Pass in BIOS device number. */
174 bi.bi_bios_dev = bc_unit2bios(rootdev->d_kind.bioscd.unit);
175 bootdevnr = bc_getdev(rootdev);
176 break;
177
178 case DEVT_DISK:
179 /* pass in the BIOS device number of the current disk */
180 bi.bi_bios_dev = bd_unit2bios(rootdev->d_kind.biosdisk.unit);
181 bootdevnr = bd_getdev(rootdev);
182 break;
183
184 case DEVT_NET:
185 break;
186
187 default:
188 printf("WARNING - don't know how to boot from device type %d\n", rootdev->d_type);
189 }
190 if (bootdevnr == -1) {
191 printf("root device %s invalid\n", i386_fmtdev(rootdev));
192 return (EINVAL);
193 }
194 free(rootdev);
195
196 /* find the last module in the chain */
197 addr = 0;
198 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
199 if (addr < (xp->f_addr + xp->f_size))
200 addr = xp->f_addr + xp->f_size;
201 }
202 /* pad to a page boundary */
203 addr = roundup(addr, PAGE_SIZE);
204
205 /* copy our environment */
206 envp = addr;
207 addr = bi_copyenv(addr);
208
209 /* pad to a page boundary */
210 addr = roundup(addr, PAGE_SIZE);
211
212 kfp = file_findfile(NULL, "elf kernel");
213 if (kfp == NULL)
214 kfp = file_findfile(NULL, "elf32 kernel");
215 if (kfp == NULL)
216 panic("can't find kernel file");
217 kernend = 0; /* fill it in later */
218 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
219 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
220 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
221 bios_addsmapdata(kfp);
222
223 /* Figure out the size and location of the metadata */
224 *modulep = addr;
225 size = bi_copymodules32(0);
226 kernend = roundup(addr + size, PAGE_SIZE);
227 *kernendp = kernend;
228
229 /* patch MODINFOMD_KERNEND */
230 md = file_findmetadata(kfp, MODINFOMD_KERNEND);
231 bcopy(&kernend, md->md_data, sizeof kernend);
232
233 /* copy module list and metadata */
234 (void)bi_copymodules32(addr);
235
236 ssym = esym = 0;
237 md = file_findmetadata(kfp, MODINFOMD_SSYM);
238 if (md != NULL)
239 ssym = *((vm_offset_t *)&(md->md_data));
240 md = file_findmetadata(kfp, MODINFOMD_ESYM);
241 if (md != NULL)
242 esym = *((vm_offset_t *)&(md->md_data));
243 if (ssym == 0 || esym == 0)
244 ssym = esym = 0; /* sanity */
245
246 /* legacy bootinfo structure */
247 kernelname = getenv("kernelname");
248 i386_getdev(NULL, kernelname, &kernelpath);
249 bi.bi_version = BOOTINFO_VERSION;
250 bi.bi_kernelname = 0; /* XXX char * -> kernel name */
251 bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */
252 bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */
253 for (i = 0; i < N_BIOS_GEOM; i++)
254 bi.bi_bios_geom[i] = bd_getbigeom(i);
255 bi.bi_size = sizeof(bi);
256 bi.bi_memsizes_valid = 1;
257 bi.bi_basemem = bios_basemem / 1024;
258 bi.bi_extmem = bios_extmem / 1024;
259 bi.bi_envp = envp;
260 bi.bi_modulep = *modulep;
261 bi.bi_kernend = kernend;
262 bi.bi_kernelname = VTOP(kernelpath);
263 bi.bi_symtab = ssym; /* XXX this is only the primary kernel symtab */
264 bi.bi_esymtab = esym;
265
266 /* legacy boot arguments */
267 *howtop = howto | RB_BOOTINFO;
268 *bootdevp = bootdevnr;
269 *bip = VTOP(&bi);
270
271 return(0);
272}