diff options
Diffstat (limited to 'stand/efi/loader/arch/i386/bootinfo.c')
-rw-r--r-- | stand/efi/loader/arch/i386/bootinfo.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/stand/efi/loader/arch/i386/bootinfo.c b/stand/efi/loader/arch/i386/bootinfo.c new file mode 100644 index 000000000000..cbd6e4ebe977 --- /dev/null +++ b/stand/efi/loader/arch/i386/bootinfo.c @@ -0,0 +1,275 @@ +/*- + * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> + * Copyright (c) 2006 Marcel Moolenaar + * 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <stand.h> +#include <string.h> +#include <sys/param.h> +#include <sys/reboot.h> +#include <sys/linker.h> +#include <sys/boot.h> + +#include <efi.h> +#include <efilib.h> + +#include "bootstrap.h" +#include "libi386.h" +#include <machine/bootinfo.h> + +static const char howto_switches[] = "aCdrgDmphsv"; +static int howto_masks[] = { + RB_ASKNAME, RB_CDROM, RB_KDB, RB_DFLTROOT, RB_GDB, RB_MULTIPLE, + RB_MUTE, RB_PAUSE, RB_SERIAL, RB_SINGLE, RB_VERBOSE +}; + +int +bi_getboothowto(char *kargs) +{ + const char *sw; + char *opts; + int howto, i; + + howto = 0; + + /* Get the boot options from the environment first. */ + for (i = 0; howto_names[i].ev != NULL; i++) { + if (getenv(howto_names[i].ev) != NULL) + howto |= howto_names[i].mask; + } + + /* Parse kargs */ + if (kargs == NULL) + return (howto); + + opts = strchr(kargs, '-'); + while (opts != NULL) { + while (*(++opts) != '\0') { + sw = strchr(howto_switches, *opts); + if (sw == NULL) + break; + howto |= howto_masks[sw - howto_switches]; + } + opts = strchr(opts, '-'); + } + + return (howto); +} + +/* + * Copy the environment into the load area starting at (addr). + * Each variable is formatted as <name>=<value>, with a single nul + * separating each variable, and a double nul terminating the environment. + */ +vm_offset_t +bi_copyenv(vm_offset_t start) +{ + struct env_var *ep; + vm_offset_t addr, last; + size_t len; + + addr = last = start; + + /* Traverse the environment. */ + for (ep = environ; ep != NULL; ep = ep->ev_next) { + len = strlen(ep->ev_name); + if (i386_copyin(ep->ev_name, addr, len) != len) + break; + addr += len; + if (i386_copyin("=", addr, 1) != 1) + break; + addr++; + if (ep->ev_value != NULL) { + len = strlen(ep->ev_value); + if (i386_copyin(ep->ev_value, addr, len) != len) + break; + addr += len; + } + if (i386_copyin("", addr, 1) != 1) + break; + last = ++addr; + } + + if (i386_copyin("", last++, 1) != 1) + last = start; + return(last); +} + +/* + * 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 preceded 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_int64_t));\ +} + +#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_int64_t)); \ +} + +#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_int64_t));\ +} + +#define MOD_END(a) { \ + COPY32(MODINFO_END, a); \ + COPY32(0, a); \ +} + +vm_offset_t +bi_copymodules(vm_offset_t addr) +{ + struct preloaded_file *fp; + struct file_metadata *md; + + /* Start with the first module on the list, should be the kernel. */ + for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) { + /* The name field must come first. */ + MOD_NAME(addr, fp->f_name); + MOD_TYPE(addr, fp->f_type); + if (fp->f_args) + MOD_ARGS(addr, fp->f_args); + MOD_ADDR(addr, fp->f_addr); + MOD_SIZE(addr, fp->f_size); + for (md = fp->f_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 the kernel. + * + * - The kernel environment is copied into kernel space. + * - Module metadata are formatted and placed in kernel space. + */ +int +bi_load(struct preloaded_file *fp, uint64_t *bi_addr) +{ + struct bootinfo bi; + struct preloaded_file *xp; + struct file_metadata *md; + struct devdesc *rootdev; + char *rootdevname; + vm_offset_t addr, ssym, esym; + + bzero(&bi, sizeof(struct bootinfo)); + bi.bi_version = 1; +// bi.bi_boothowto = bi_getboothowto(fp->f_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) { + /* Try reading /etc/fstab to select the root device. */ + getrootmount(i386_fmtdev(rootdev)); + free(rootdev); + } + + md = file_findmetadata(fp, MODINFOMD_SSYM); + ssym = (md != NULL) ? *((vm_offset_t *)&(md->md_data)) : 0; + md = file_findmetadata(fp, MODINFOMD_ESYM); + esym = (md != NULL) ? *((vm_offset_t *)&(md->md_data)) : 0; + if (ssym != 0 && esym != 0) { + bi.bi_symtab = ssym; + bi.bi_esymtab = esym; + } + + /* Find the last module in the chain. */ + addr = 0; + for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { + if (addr < (xp->f_addr + xp->f_size)) + addr = xp->f_addr + xp->f_size; + } + + addr = (addr + 15) & ~15; + + /* Copy module list and metadata. */ + bi.bi_modulep = addr; + addr = bi_copymodules(addr); + if (addr <= bi.bi_modulep) { + addr = bi.bi_modulep; + bi.bi_modulep = 0; + } + + addr = (addr + 15) & ~15; + + /* Copy our environment. */ + bi.bi_envp = addr; + addr = bi_copyenv(addr); + if (addr <= bi.bi_envp) { + addr = bi.bi_envp; + bi.bi_envp = 0; + } + + addr = (addr + PAGE_MASK) & ~PAGE_MASK; + bi.bi_kernend = addr; + + return (ldr_bootinfo(&bi, bi_addr)); +} |