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3e15b01d69
Sponsored by: Netflix
192 lines
6.0 KiB
C
192 lines
6.0 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stand.h>
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#include <sys/param.h>
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#include <sys/reboot.h>
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#include <sys/linker.h>
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#include <machine/bootinfo.h>
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#include <machine/metadata.h>
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#include "bootstrap.h"
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#include "modinfo.h"
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#include "libi386.h"
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#include "btxv86.h"
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#ifdef LOADER_GELI_SUPPORT
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#include "geliboot.h"
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#endif
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static struct bootinfo *bi;
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/*
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* Load the information expected by an i386 kernel.
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*
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* - The 'boothowto' argument is constructed
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* - The 'bootdev' argument is constructed
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* - The 'bootinfo' struct is constructed, and copied into the kernel space.
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* - The kernel environment is copied into kernel space.
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* - Module metadata are formatted and placed in kernel space.
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*/
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int
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bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp)
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{
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struct preloaded_file *xp, *kfp;
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struct i386_devdesc *rootdev;
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struct file_metadata *md;
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vm_offset_t addr;
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vm_offset_t kernend;
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vm_offset_t envp;
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vm_offset_t size;
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vm_offset_t ssym, esym;
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char *rootdevname;
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int bootdevnr, i, howto;
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char *kernelname;
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const char *kernelpath;
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howto = bi_getboothowto(args);
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/*
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* Allow the environment variable 'rootdev' to override the supplied device
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* This should perhaps go to MI code and/or have $rootdev tested/set by
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* MI code before launching the kernel.
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*/
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rootdevname = getenv("rootdev");
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i386_getdev((void **)(&rootdev), rootdevname, NULL);
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if (rootdev == NULL) { /* bad $rootdev/$currdev */
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printf("can't determine root device\n");
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return(EINVAL);
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}
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/* Try reading the /etc/fstab file to select the root device */
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getrootmount(devformat(&rootdev->dd));
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/* Do legacy rootdev guessing */
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/* XXX - use a default bootdev of 0. Is this ok??? */
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bootdevnr = 0;
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bi = calloc(sizeof(*bi), 1);
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switch(rootdev->dd.d_dev->dv_type) {
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case DEVT_CD:
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case DEVT_DISK:
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/* pass in the BIOS device number of the current disk */
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bi->bi_bios_dev = bd_unit2bios(rootdev);
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bootdevnr = bd_getdev(rootdev);
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break;
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case DEVT_NET:
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case DEVT_ZFS:
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break;
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default:
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printf("WARNING - don't know how to boot from device type %d\n",
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rootdev->dd.d_dev->dv_type);
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}
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if (bootdevnr == -1) {
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printf("root device %s invalid\n", devformat(&rootdev->dd));
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return (EINVAL);
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}
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free(rootdev);
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/* find the last module in the chain */
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addr = 0;
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for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
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if (addr < (xp->f_addr + xp->f_size))
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addr = xp->f_addr + xp->f_size;
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}
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/* pad to a page boundary */
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addr = roundup(addr, PAGE_SIZE);
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addr = build_font_module(addr);
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/* copy our environment */
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envp = addr;
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addr = md_copyenv(addr);
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/* pad to a page boundary */
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addr = roundup(addr, PAGE_SIZE);
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kfp = file_findfile(NULL, "elf kernel");
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if (kfp == NULL)
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kfp = file_findfile(NULL, "elf32 kernel");
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if (kfp == NULL)
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panic("can't find kernel file");
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kernend = 0; /* fill it in later */
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file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
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file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
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file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
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bios_addsmapdata(kfp);
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#ifdef LOADER_GELI_SUPPORT
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geli_export_key_metadata(kfp);
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#endif
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bi_load_vbe_data(kfp);
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/* Figure out the size and location of the metadata */
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*modulep = addr;
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size = md_copymodules(0, false);
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kernend = roundup(addr + size, PAGE_SIZE);
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*kernendp = kernend;
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/* patch MODINFOMD_KERNEND */
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md = file_findmetadata(kfp, MODINFOMD_KERNEND);
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bcopy(&kernend, md->md_data, sizeof kernend);
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/* copy module list and metadata */
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(void)md_copymodules(addr, false);
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ssym = esym = 0;
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md = file_findmetadata(kfp, MODINFOMD_SSYM);
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if (md != NULL)
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ssym = *((vm_offset_t *)&(md->md_data));
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md = file_findmetadata(kfp, MODINFOMD_ESYM);
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if (md != NULL)
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esym = *((vm_offset_t *)&(md->md_data));
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if (ssym == 0 || esym == 0)
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ssym = esym = 0; /* sanity */
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/* legacy bootinfo structure */
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kernelname = getenv("kernelname");
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i386_getdev(NULL, kernelname, &kernelpath);
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bi->bi_version = BOOTINFO_VERSION;
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bi->bi_size = sizeof(*bi);
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bi->bi_memsizes_valid = 1;
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bi->bi_basemem = bios_basemem / 1024;
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bi->bi_extmem = bios_extmem / 1024;
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bi->bi_envp = envp;
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bi->bi_modulep = *modulep;
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bi->bi_kernend = kernend;
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bi->bi_kernelname = VTOP(kernelpath);
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bi->bi_symtab = ssym; /* XXX this is only the primary kernel symtab */
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bi->bi_esymtab = esym;
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/* legacy boot arguments */
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*howtop = howto | RB_BOOTINFO;
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*bootdevp = bootdevnr;
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*bip = VTOP(bi);
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return(0);
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}
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