1223695Sdfr/*- 2223695Sdfr * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3223695Sdfr * All rights reserved. 4223695Sdfr * 5223695Sdfr * Redistribution and use in source and binary forms, with or without 6223695Sdfr * modification, are permitted provided that the following conditions 7223695Sdfr * are met: 8223695Sdfr * 1. Redistributions of source code must retain the above copyright 9223695Sdfr * notice, this list of conditions and the following disclaimer. 10223695Sdfr * 2. Redistributions in binary form must reproduce the above copyright 11223695Sdfr * notice, this list of conditions and the following disclaimer in the 12223695Sdfr * documentation and/or other materials provided with the distribution. 13223695Sdfr * 14223695Sdfr * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15223695Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16223695Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17223695Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18223695Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19223695Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20223695Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21223695Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22223695Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23223695Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24223695Sdfr * SUCH DAMAGE. 25223695Sdfr */ 26223695Sdfr 27223695Sdfr#include <sys/cdefs.h> 28223695Sdfr__FBSDID("$FreeBSD$"); 29223695Sdfr 30223695Sdfr#include <stand.h> 31223695Sdfr#include <sys/param.h> 32223695Sdfr#include <sys/reboot.h> 33223695Sdfr#include <sys/linker.h> 34223695Sdfr#include <i386/include/bootinfo.h> 35223695Sdfr 36223695Sdfr#include "bootstrap.h" 37223695Sdfr#include "libuserboot.h" 38223695Sdfr 39223695Sdfrstatic struct bootinfo bi; 40223695Sdfr 41223695Sdfr/* 42223695Sdfr * Copy module-related data into the load area, where it can be 43223695Sdfr * used as a directory for loaded modules. 44223695Sdfr * 45223695Sdfr * Module data is presented in a self-describing format. Each datum 46223695Sdfr * is preceded by a 32-bit identifier and a 32-bit size field. 47223695Sdfr * 48223695Sdfr * Currently, the following data are saved: 49223695Sdfr * 50223695Sdfr * MOD_NAME (variable) module name (string) 51223695Sdfr * MOD_TYPE (variable) module type (string) 52223695Sdfr * MOD_ARGS (variable) module parameters (string) 53223695Sdfr * MOD_ADDR sizeof(vm_offset_t) module load address 54223695Sdfr * MOD_SIZE sizeof(size_t) module size 55223695Sdfr * MOD_METADATA (variable) type-specific metadata 56223695Sdfr */ 57223695Sdfr#define COPY32(v, a, c) { \ 58223695Sdfr u_int32_t x = (v); \ 59223695Sdfr if (c) \ 60223695Sdfr CALLBACK(copyin, &x, a, sizeof(x)); \ 61223695Sdfr a += sizeof(x); \ 62223695Sdfr} 63223695Sdfr 64223695Sdfr#define MOD_STR(t, a, s, c) { \ 65223695Sdfr COPY32(t, a, c); \ 66223695Sdfr COPY32(strlen(s) + 1, a, c); \ 67223695Sdfr if (c) \ 68223695Sdfr CALLBACK(copyin, s, a, strlen(s) + 1); \ 69223695Sdfr a += roundup(strlen(s) + 1, sizeof(u_long));\ 70223695Sdfr} 71223695Sdfr 72223695Sdfr#define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c) 73223695Sdfr#define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c) 74223695Sdfr#define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c) 75223695Sdfr 76223695Sdfr#define MOD_VAR(t, a, s, c) { \ 77223695Sdfr COPY32(t, a, c); \ 78223695Sdfr COPY32(sizeof(s), a, c); \ 79223695Sdfr if (c) \ 80223695Sdfr CALLBACK(copyin, &s, a, sizeof(s)); \ 81223695Sdfr a += roundup(sizeof(s), sizeof(u_long)); \ 82223695Sdfr} 83223695Sdfr 84223695Sdfr#define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c) 85223695Sdfr#define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c) 86223695Sdfr 87223695Sdfr#define MOD_METADATA(a, mm, c) { \ 88223695Sdfr COPY32(MODINFO_METADATA | mm->md_type, a, c); \ 89223695Sdfr COPY32(mm->md_size, a, c); \ 90223695Sdfr if (c) \ 91223695Sdfr CALLBACK(copyin, mm->md_data, a, mm->md_size); \ 92223695Sdfr a += roundup(mm->md_size, sizeof(u_long));\ 93223695Sdfr} 94223695Sdfr 95223695Sdfr#define MOD_END(a, c) { \ 96223695Sdfr COPY32(MODINFO_END, a, c); \ 97223695Sdfr COPY32(0, a, c); \ 98223695Sdfr} 99223695Sdfr 100223695Sdfrstatic vm_offset_t 101223695Sdfrbi_copymodules32(vm_offset_t addr) 102223695Sdfr{ 103223695Sdfr struct preloaded_file *fp; 104223695Sdfr struct file_metadata *md; 105223695Sdfr int c; 106223695Sdfr 107223695Sdfr c = addr != 0; 108223695Sdfr /* start with the first module on the list, should be the kernel */ 109223695Sdfr for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) { 110223695Sdfr 111223695Sdfr MOD_NAME(addr, fp->f_name, c); /* this field must come first */ 112223695Sdfr MOD_TYPE(addr, fp->f_type, c); 113223695Sdfr if (fp->f_args) 114223695Sdfr MOD_ARGS(addr, fp->f_args, c); 115223695Sdfr MOD_ADDR(addr, fp->f_addr, c); 116223695Sdfr MOD_SIZE(addr, fp->f_size, c); 117223695Sdfr for (md = fp->f_metadata; md != NULL; md = md->md_next) 118223695Sdfr if (!(md->md_type & MODINFOMD_NOCOPY)) 119223695Sdfr MOD_METADATA(addr, md, c); 120223695Sdfr } 121223695Sdfr MOD_END(addr, c); 122223695Sdfr return(addr); 123223695Sdfr} 124223695Sdfr 125223695Sdfr/* 126223695Sdfr * Load the information expected by an i386 kernel. 127223695Sdfr * 128223695Sdfr * - The 'boothowto' argument is constructed 129223695Sdfr * - The 'bootdev' argument is constructed 130223695Sdfr * - The 'bootinfo' struct is constructed, and copied into the kernel space. 131223695Sdfr * - The kernel environment is copied into kernel space. 132223695Sdfr * - Module metadata are formatted and placed in kernel space. 133223695Sdfr */ 134223695Sdfrint 135223695Sdfrbi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp) 136223695Sdfr{ 137223695Sdfr struct preloaded_file *xp, *kfp; 138223695Sdfr struct i386_devdesc *rootdev; 139223695Sdfr struct file_metadata *md; 140223695Sdfr vm_offset_t addr; 141223695Sdfr vm_offset_t kernend; 142223695Sdfr vm_offset_t envp; 143223695Sdfr vm_offset_t size; 144223695Sdfr vm_offset_t ssym, esym; 145223695Sdfr char *rootdevname; 146243243Sae int bootdevnr, howto; 147223695Sdfr char *kernelname; 148223695Sdfr const char *kernelpath; 149223695Sdfr 150223695Sdfr howto = bi_getboothowto(args); 151223695Sdfr 152223695Sdfr /* 153223695Sdfr * Allow the environment variable 'rootdev' to override the supplied device 154223695Sdfr * This should perhaps go to MI code and/or have $rootdev tested/set by 155223695Sdfr * MI code before launching the kernel. 156223695Sdfr */ 157223695Sdfr rootdevname = getenv("rootdev"); 158223695Sdfr userboot_getdev((void **)(&rootdev), rootdevname, NULL); 159223695Sdfr if (rootdev == NULL) { /* bad $rootdev/$currdev */ 160223695Sdfr printf("can't determine root device\n"); 161223695Sdfr return(EINVAL); 162223695Sdfr } 163223695Sdfr 164223695Sdfr /* Try reading the /etc/fstab file to select the root device */ 165223695Sdfr getrootmount(userboot_fmtdev((void *)rootdev)); 166223695Sdfr 167223695Sdfr bootdevnr = 0; 168223695Sdfr#if 0 169223695Sdfr if (bootdevnr == -1) { 170223695Sdfr printf("root device %s invalid\n", i386_fmtdev(rootdev)); 171223695Sdfr return (EINVAL); 172223695Sdfr } 173223695Sdfr#endif 174223695Sdfr free(rootdev); 175223695Sdfr 176223695Sdfr /* find the last module in the chain */ 177223695Sdfr addr = 0; 178223695Sdfr for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 179223695Sdfr if (addr < (xp->f_addr + xp->f_size)) 180223695Sdfr addr = xp->f_addr + xp->f_size; 181223695Sdfr } 182223695Sdfr /* pad to a page boundary */ 183223695Sdfr addr = roundup(addr, PAGE_SIZE); 184223695Sdfr 185223695Sdfr /* copy our environment */ 186223695Sdfr envp = addr; 187223695Sdfr addr = bi_copyenv(addr); 188223695Sdfr 189223695Sdfr /* pad to a page boundary */ 190223695Sdfr addr = roundup(addr, PAGE_SIZE); 191223695Sdfr 192223695Sdfr kfp = file_findfile(NULL, "elf kernel"); 193223695Sdfr if (kfp == NULL) 194223695Sdfr kfp = file_findfile(NULL, "elf32 kernel"); 195223695Sdfr if (kfp == NULL) 196223695Sdfr panic("can't find kernel file"); 197223695Sdfr kernend = 0; /* fill it in later */ 198223695Sdfr file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 199223695Sdfr file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 200223695Sdfr file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 201223695Sdfr#if 0 202223695Sdfr bios_addsmapdata(kfp); 203223695Sdfr#endif 204223695Sdfr 205223695Sdfr /* Figure out the size and location of the metadata */ 206223695Sdfr *modulep = addr; 207223695Sdfr size = bi_copymodules32(0); 208223695Sdfr kernend = roundup(addr + size, PAGE_SIZE); 209223695Sdfr *kernendp = kernend; 210223695Sdfr 211223695Sdfr /* patch MODINFOMD_KERNEND */ 212223695Sdfr md = file_findmetadata(kfp, MODINFOMD_KERNEND); 213223695Sdfr bcopy(&kernend, md->md_data, sizeof kernend); 214223695Sdfr 215223695Sdfr /* copy module list and metadata */ 216223695Sdfr (void)bi_copymodules32(addr); 217223695Sdfr 218223695Sdfr ssym = esym = 0; 219223695Sdfr md = file_findmetadata(kfp, MODINFOMD_SSYM); 220223695Sdfr if (md != NULL) 221223695Sdfr ssym = *((vm_offset_t *)&(md->md_data)); 222223695Sdfr md = file_findmetadata(kfp, MODINFOMD_ESYM); 223223695Sdfr if (md != NULL) 224223695Sdfr esym = *((vm_offset_t *)&(md->md_data)); 225223695Sdfr if (ssym == 0 || esym == 0) 226223695Sdfr ssym = esym = 0; /* sanity */ 227223695Sdfr 228223695Sdfr /* legacy bootinfo structure */ 229223695Sdfr kernelname = getenv("kernelname"); 230223695Sdfr userboot_getdev(NULL, kernelname, &kernelpath); 231223695Sdfr bi.bi_version = BOOTINFO_VERSION; 232223695Sdfr bi.bi_kernelname = 0; /* XXX char * -> kernel name */ 233223695Sdfr bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */ 234223695Sdfr bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */ 235223695Sdfr#if 0 236223695Sdfr for (i = 0; i < N_BIOS_GEOM; i++) 237223695Sdfr bi.bi_bios_geom[i] = bd_getbigeom(i); 238223695Sdfr#endif 239223695Sdfr bi.bi_size = sizeof(bi); 240223695Sdfr bi.bi_memsizes_valid = 1; 241223695Sdfr#if 0 242223695Sdfr bi.bi_basemem = bios_basemem / 1024; 243223695Sdfr bi.bi_extmem = bios_extmem / 1024; 244223695Sdfr#endif 245223695Sdfr bi.bi_envp = envp; 246223695Sdfr bi.bi_modulep = *modulep; 247223695Sdfr bi.bi_kernend = kernend; 248223695Sdfr bi.bi_symtab = ssym; /* XXX this is only the primary kernel symtab */ 249223695Sdfr bi.bi_esymtab = esym; 250223695Sdfr 251223695Sdfr /* 252223695Sdfr * Copy the legacy bootinfo and kernel name to the guest at 0x2000 253223695Sdfr */ 254223695Sdfr bi.bi_kernelname = (char *) (0x2000 + sizeof(bi)); 255223695Sdfr CALLBACK(copyin, &bi, 0x2000, sizeof(bi)); 256223695Sdfr CALLBACK(copyin, kernelname, 0x2000 + sizeof(bi), strlen(kernelname) + 1); 257223695Sdfr 258223695Sdfr /* legacy boot arguments */ 259223695Sdfr *howtop = howto | RB_BOOTINFO; 260223695Sdfr *bootdevp = bootdevnr; 261223695Sdfr *bip = 0x2000; 262223695Sdfr 263223695Sdfr return(0); 264223695Sdfr} 265