/*- * Copyright (c) 1998 Michael Smith * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: src/sys/boot/i386/libi386/bootinfo.c,v 1.23.2.6 2002/01/07 07:37:52 jhb Exp $ */ #include #include #include #include #include #include "bootstrap.h" #include "libi386.h" #include "btxv86.h" static struct bootinfo bi; /* * Return a 'boothowto' value corresponding to the kernel arguments in * (kargs) and any relevant environment variables. */ static struct { const char *ev; int mask; } howto_names[] = { {"boot_askname", RB_ASKNAME}, {"boot_cdrom", RB_CDROM}, {"boot_userconfig", RB_CONFIG}, {"boot_ddb", RB_KDB}, {"boot_gdb", RB_GDB}, {"boot_single", RB_SINGLE}, {"boot_verbose", RB_VERBOSE}, {NULL, 0} }; vm_offset_t bi_copymodules(vm_offset_t addr); int bi_getboothowto(char *kargs) { char *cp; int howto; int active; int i; /* Parse kargs */ howto = 0; if (kargs != NULL) { cp = kargs; active = 0; while (*cp != 0) { if (!active && (*cp == '-')) { active = 1; } else if (active) switch (*cp) { case 'a': howto |= RB_ASKNAME; break; case 'c': howto |= RB_CONFIG; break; case 'C': howto |= RB_CDROM; break; case 'd': howto |= RB_KDB; break; case 'm': howto |= RB_MUTE; break; case 'g': howto |= RB_GDB; break; case 'h': howto |= RB_SERIAL; break; case 'p': howto |= RB_PAUSE; break; case 'r': howto |= RB_DFLTROOT; break; case 's': howto |= RB_SINGLE; break; case 'v': howto |= RB_VERBOSE; break; default: active = 0; break; } cp++; } } /* get equivalents from the environment */ for (i = 0; howto_names[i].ev != NULL; i++) if (getenv(howto_names[i].ev) != NULL) howto |= howto_names[i].mask; if (!strcmp(getenv("console"), "comconsole")) howto |= RB_SERIAL; if (!strcmp(getenv("console"), "nullconsole")) howto |= RB_MUTE; return(howto); } /* * Copy the environment into the load area starting at (addr). * Each variable is formatted as =, with a single nul * separating each variable, and a double nul terminating the environment. */ vm_offset_t bi_copyenv(vm_offset_t addr) { struct env_var *ep; /* traverse the environment */ for (ep = environ; ep != NULL; ep = ep->ev_next) { i386_copyin(ep->ev_name, addr, strlen(ep->ev_name)); addr += strlen(ep->ev_name); i386_copyin("=", addr, 1); addr++; if (ep->ev_value != NULL) { i386_copyin(ep->ev_value, addr, strlen(ep->ev_value)); addr += strlen(ep->ev_value); } i386_copyin("", addr, 1); addr++; } i386_copyin("", addr, 1); addr++; return(addr); } /* * Copy module-related data into the load area, where it can be * used as a directory for loaded modules. * * Module data is presented in a self-describing format. Each datum * is preceeded by a 32-bit identifier and a 32-bit size field. * * Currently, the following data are saved: * * MOD_NAME (variable) module name (string) * MOD_TYPE (variable) module type (string) * MOD_ARGS (variable) module parameters (string) * MOD_ADDR sizeof(vm_offset_t) module load address * MOD_SIZE sizeof(size_t) module size * MOD_METADATA (variable) type-specific metadata */ #define COPY32(v, a) { \ u_int32_t x = (v); \ i386_copyin(&x, a, sizeof(x)); \ a += sizeof(x); \ } #define MOD_STR(t, a, s) { \ COPY32(t, a); \ COPY32(strlen(s) + 1, a); \ i386_copyin(s, a, strlen(s) + 1); \ a += roundup(strlen(s) + 1, sizeof(u_long));\ } #define MOD_NAME(a, s) MOD_STR(MODINFO_NAME, a, s) #define MOD_TYPE(a, s) MOD_STR(MODINFO_TYPE, a, s) #define MOD_ARGS(a, s) MOD_STR(MODINFO_ARGS, a, s) #define MOD_VAR(t, a, s) { \ COPY32(t, a); \ COPY32(sizeof(s), a); \ i386_copyin(&s, a, sizeof(s)); \ a += roundup(sizeof(s), sizeof(u_long)); \ } #define MOD_ADDR(a, s) MOD_VAR(MODINFO_ADDR, a, s) #define MOD_SIZE(a, s) MOD_VAR(MODINFO_SIZE, a, s) #define MOD_METADATA(a, mm) { \ COPY32(MODINFO_METADATA | mm->md_type, a); \ COPY32(mm->md_size, a); \ i386_copyin(mm->md_data, a, mm->md_size); \ a += roundup(mm->md_size, sizeof(u_long));\ } #define MOD_END(a) { \ COPY32(MODINFO_END, a); \ COPY32(0, a); \ } vm_offset_t bi_copymodules(vm_offset_t addr) { struct loaded_module *mp; struct module_metadata *md; /* start with the first module on the list, should be the kernel */ for (mp = mod_findmodule(NULL, NULL); mp != NULL; mp = mp->m_next) { MOD_NAME(addr, mp->m_name); /* this field must come first */ MOD_TYPE(addr, mp->m_type); if (mp->m_args) MOD_ARGS(addr, mp->m_args); MOD_ADDR(addr, mp->m_addr); MOD_SIZE(addr, mp->m_size); for (md = mp->m_metadata; md != NULL; md = md->md_next) if (!(md->md_type & MODINFOMD_NOCOPY)) MOD_METADATA(addr, md); } MOD_END(addr); return(addr); } /* * Load the information expected by an i386 kernel. * * - The 'boothowto' argument is constructed * - The 'bootdev' argument is constructed * - The 'bootinfo' struct is constructed, and copied into the kernel space. * - The kernel environment is copied into kernel space. * - Module metadata are formatted and placed in kernel space. */ int bi_load(char *args, int *howtop, int *bootdevp, vm_offset_t *bip) { struct loaded_module *xp; struct i386_devdesc *rootdev; vm_offset_t addr; char *rootdevname; int bootdevnr, i; u_int pad; char *kernelname; const char *kernelpath; *howtop = bi_getboothowto(args); /* * Allow the environment variable 'rootdev' to override the supplied device * This should perhaps go to MI code and/or have $rootdev tested/set by * MI code before launching the kernel. */ rootdevname = getenv("rootdev"); i386_getdev((void **)(&rootdev), rootdevname, NULL); if (rootdev == NULL) { /* bad $rootdev/$currdev */ printf("can't determine root device\n"); return(EINVAL); } /* Try reading the /etc/fstab file to select the root device */ getrootmount(i386_fmtdev((void *)rootdev)); /* Do legacy rootdev guessing */ /* XXX - use a default bootdev of 0. Is this ok??? */ bootdevnr = 0; switch(rootdev->d_type) { case DEVT_CD: /* Pass in BIOS device number. */ bi.bi_bios_dev = bc_unit2bios(rootdev->d_kind.bioscd.unit); bootdevnr = bc_getdev(rootdev); break; case DEVT_DISK: /* pass in the BIOS device number of the current disk */ bi.bi_bios_dev = bd_unit2bios(rootdev->d_kind.biosdisk.unit); bootdevnr = bd_getdev(rootdev); break; case DEVT_NET: break; default: printf("WARNING - don't know how to boot from device type %d\n", rootdev->d_type); } if (bootdevnr == -1) { printf("root device %s invalid\n", i386_fmtdev(rootdev)); return (EINVAL); } free(rootdev); *bootdevp = bootdevnr; /* legacy bootinfo structure */ bi.bi_version = BOOTINFO_VERSION; bi.bi_kernelname = 0; /* XXX char * -> kernel name */ bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */ bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */ for (i = 0; i < N_BIOS_GEOM; i++) bi.bi_bios_geom[i] = bd_getbigeom(i); bi.bi_size = sizeof(bi); bi.bi_memsizes_valid = 1; bi.bi_basemem = bios_basemem / 1024; bi.bi_extmem = bios_extmem / 1024; /* find the last module in the chain */ addr = 0; for (xp = mod_findmodule(NULL, NULL); xp != NULL; xp = xp->m_next) { if (addr < (xp->m_addr + xp->m_size)) addr = xp->m_addr + xp->m_size; } /* pad to a page boundary */ pad = (u_int)addr & PAGE_MASK; if (pad != 0) { pad = PAGE_SIZE - pad; addr += pad; } /* copy our environment */ bi.bi_envp = addr; addr = bi_copyenv(addr); /* pad to a page boundary */ pad = (u_int)addr & PAGE_MASK; if (pad != 0) { pad = PAGE_SIZE - pad; addr += pad; } /* copy module list and metadata */ bi.bi_modulep = addr; addr = bi_copymodules(addr); /* all done copying stuff in, save end of loaded object space */ bi.bi_kernend = addr; *howtop |= RB_BOOTINFO; /* it's there now */ /* * Get the kernel name, strip off any device prefix. */ kernelname = getenv("kernelname"); i386_getdev(NULL, kernelname, &kernelpath); bi.bi_kernelname = VTOP(kernelpath); *bip = VTOP(&bi); return(0); }