xref: /freebsd/stand/i386/libi386/bootinfo32.c (revision a03411e84728e9b267056fd31c7d1d9d1dc1b01e)
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 #include <stand.h>
29 #include <sys/param.h>
30 #include <sys/reboot.h>
31 #include <sys/linker.h>
32 #include <machine/bootinfo.h>
33 #include <machine/metadata.h>
34 #include "bootstrap.h"
35 #include "modinfo.h"
36 #include "libi386.h"
37 #include "btxv86.h"
38 
39 #ifdef LOADER_GELI_SUPPORT
40 #include "geliboot.h"
41 #endif
42 
43 static struct bootinfo  *bi;
44 
45 /*
46  * Load the information expected by an i386 kernel.
47  *
48  * - The 'boothowto' argument is constructed
49  * - The 'bootdev' argument is constructed
50  * - The 'bootinfo' struct is constructed, and copied into the kernel space.
51  * - The kernel environment is copied into kernel space.
52  * - Module metadata are formatted and placed in kernel space.
53  */
54 int
55 bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp)
56 {
57     struct preloaded_file	*xp, *kfp;
58     struct i386_devdesc		*rootdev;
59     struct file_metadata	*md;
60     vm_offset_t			addr;
61     vm_offset_t			kernend;
62     vm_offset_t			envp;
63     vm_offset_t			size;
64     vm_offset_t			ssym, esym;
65     char			*rootdevname;
66     int				bootdevnr, i, howto;
67     char			*kernelname;
68     const char			*kernelpath;
69 
70     howto = bi_getboothowto(args);
71 
72     /*
73      * Allow the environment variable 'rootdev' to override the supplied device
74      * This should perhaps go to MI code and/or have $rootdev tested/set by
75      * MI code before launching the kernel.
76      */
77     rootdevname = getenv("rootdev");
78     i386_getdev((void **)(&rootdev), rootdevname, NULL);
79     if (rootdev == NULL) {		/* bad $rootdev/$currdev */
80 	printf("can't determine root device\n");
81 	return(EINVAL);
82     }
83 
84     /* Try reading the /etc/fstab file to select the root device */
85     getrootmount(devformat(&rootdev->dd));
86 
87     /* Do legacy rootdev guessing */
88 
89     /* XXX - use a default bootdev of 0.  Is this ok??? */
90     bootdevnr = 0;
91 
92     bi = calloc(sizeof(*bi), 1);
93     switch(rootdev->dd.d_dev->dv_type) {
94     case DEVT_CD:
95     case DEVT_DISK:
96 	/* pass in the BIOS device number of the current disk */
97 	bi->bi_bios_dev = bd_unit2bios(rootdev);
98 	bootdevnr = bd_getdev(rootdev);
99 	break;
100 
101     case DEVT_NET:
102     case DEVT_ZFS:
103 	    break;
104 
105     default:
106 	printf("WARNING - don't know how to boot from device type %d\n",
107 	    rootdev->dd.d_dev->dv_type);
108     }
109     if (bootdevnr == -1) {
110 	printf("root device %s invalid\n", devformat(&rootdev->dd));
111 	return (EINVAL);
112     }
113     free(rootdev);
114 
115     /* find the last module in the chain */
116     addr = 0;
117     for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
118 	if (addr < (xp->f_addr + xp->f_size))
119 	    addr = xp->f_addr + xp->f_size;
120     }
121     /* pad to a page boundary */
122     addr = roundup(addr, PAGE_SIZE);
123 
124     addr = build_font_module(addr);
125 
126     /* copy our environment */
127     envp = addr;
128     addr = md_copyenv(addr);
129 
130     /* pad to a page boundary */
131     addr = roundup(addr, PAGE_SIZE);
132 
133     kfp = file_findfile(NULL, "elf kernel");
134     if (kfp == NULL)
135       kfp = file_findfile(NULL, "elf32 kernel");
136     if (kfp == NULL)
137 	panic("can't find kernel file");
138     kernend = 0;	/* fill it in later */
139     file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
140     file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
141     file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
142     bios_addsmapdata(kfp);
143 #ifdef LOADER_GELI_SUPPORT
144     geli_export_key_metadata(kfp);
145 #endif
146     bi_load_vbe_data(kfp);
147 
148     /* Figure out the size and location of the metadata */
149     *modulep = addr;
150     size = md_copymodules(0, false);
151     kernend = roundup(addr + size, PAGE_SIZE);
152     *kernendp = kernend;
153 
154     /* patch MODINFOMD_KERNEND */
155     md = file_findmetadata(kfp, MODINFOMD_KERNEND);
156     bcopy(&kernend, md->md_data, sizeof kernend);
157 
158     /* copy module list and metadata */
159     (void)md_copymodules(addr, false);
160 
161     ssym = esym = 0;
162     md = file_findmetadata(kfp, MODINFOMD_SSYM);
163     if (md != NULL)
164 	ssym = *((vm_offset_t *)&(md->md_data));
165     md = file_findmetadata(kfp, MODINFOMD_ESYM);
166     if (md != NULL)
167 	esym = *((vm_offset_t *)&(md->md_data));
168     if (ssym == 0 || esym == 0)
169 	ssym = esym = 0;		/* sanity */
170 
171     /* legacy bootinfo structure */
172     kernelname = getenv("kernelname");
173     i386_getdev(NULL, kernelname, &kernelpath);
174     bi->bi_version = BOOTINFO_VERSION;
175     bi->bi_size = sizeof(*bi);
176     bi->bi_memsizes_valid = 1;
177     bi->bi_basemem = bios_basemem / 1024;
178     bi->bi_extmem = bios_extmem / 1024;
179     bi->bi_envp = envp;
180     bi->bi_modulep = *modulep;
181     bi->bi_kernend = kernend;
182     bi->bi_kernelname = VTOP(kernelpath);
183     bi->bi_symtab = ssym;       /* XXX this is only the primary kernel symtab */
184     bi->bi_esymtab = esym;
185 
186     /* legacy boot arguments */
187     *howtop = howto | RB_BOOTINFO;
188     *bootdevp = bootdevnr;
189     *bip = VTOP(bi);
190 
191     return(0);
192 }
193