diff options
Diffstat (limited to 'sys/boot/i386/libi386/bootinfo64.c')
| -rw-r--r-- | sys/boot/i386/libi386/bootinfo64.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/sys/boot/i386/libi386/bootinfo64.c b/sys/boot/i386/libi386/bootinfo64.c new file mode 100644 index 0000000..58b4e3c --- /dev/null +++ b/sys/boot/i386/libi386/bootinfo64.c @@ -0,0 +1,208 @@ +/*- + * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> + * 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 <sys/param.h> +#include <sys/reboot.h> +#include <sys/linker.h> +#include <machine/bootinfo.h> +#include "bootstrap.h" +#include "libi386.h" +#include "btxv86.h" + +/* + * 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, c) { \ + u_int32_t x = (v); \ + if (c) \ + i386_copyin(&x, a, sizeof(x)); \ + a += sizeof(x); \ +} + +#define MOD_STR(t, a, s, c) { \ + COPY32(t, a, c); \ + COPY32(strlen(s) + 1, a, c); \ + if (c) \ + i386_copyin(s, a, strlen(s) + 1); \ + a += roundup(strlen(s) + 1, sizeof(u_int64_t));\ +} + +#define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c) +#define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c) +#define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c) + +#define MOD_VAR(t, a, s, c) { \ + COPY32(t, a, c); \ + COPY32(sizeof(s), a, c); \ + if (c) \ + i386_copyin(&s, a, sizeof(s)); \ + a += roundup(sizeof(s), sizeof(u_int64_t)); \ +} + +#define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c) +#define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c) + +#define MOD_METADATA(a, mm, c) { \ + COPY32(MODINFO_METADATA | mm->md_type, a, c); \ + COPY32(mm->md_size, a, c); \ + if (c) \ + i386_copyin(mm->md_data, a, mm->md_size); \ + a += roundup(mm->md_size, sizeof(u_int64_t));\ +} + +#define MOD_END(a, c) { \ + COPY32(MODINFO_END, a, c); \ + COPY32(0, a, c); \ +} + +static vm_offset_t +bi_copymodules64(vm_offset_t addr) +{ + struct preloaded_file *fp; + struct file_metadata *md; + int c; + u_int64_t v; + + c = addr != 0; + /* start with the first module on the list, should be the kernel */ + for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) { + + MOD_NAME(addr, fp->f_name, c); /* this field must come first */ + MOD_TYPE(addr, fp->f_type, c); + if (fp->f_args) + MOD_ARGS(addr, fp->f_args, c); + v = fp->f_addr; + MOD_ADDR(addr, v, c); + v = fp->f_size; + MOD_SIZE(addr, v, c); + for (md = fp->f_metadata; md != NULL; md = md->md_next) + if (!(md->md_type & MODINFOMD_NOCOPY)) + MOD_METADATA(addr, md, c); + } + MOD_END(addr, c); + 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_load64(char *args, vm_offset_t *modulep, vm_offset_t *kernendp) +{ + struct preloaded_file *xp, *kfp; + struct i386_devdesc *rootdev; + struct file_metadata *md; + vm_offset_t addr; + u_int64_t kernend; + u_int64_t envp; + vm_offset_t size; + char *rootdevname; + int i, howto; + char *kernelname; + const char *kernelpath; + + howto = 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)); + + /* 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; + } + /* pad to a page boundary */ + addr = roundup(addr, PAGE_SIZE); + + /* copy our environment */ + envp = addr; + addr = bi_copyenv(addr); + + /* pad to a page boundary */ + addr = roundup(addr, PAGE_SIZE); + + kfp = file_findfile(NULL, "elf kernel"); + if (kfp == NULL) + kfp = file_findfile(NULL, "elf64 kernel"); + if (kfp == NULL) + panic("can't find kernel file"); + kernend = 0; /* fill it in later */ + file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); + file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); + file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); + bios_addsmapdata(kfp); + + /* Figure out the size and location of the metadata */ + *modulep = addr; + size = bi_copymodules64(0); + kernend = roundup(addr + size, PAGE_SIZE); + *kernendp = kernend; + + /* patch MODINFOMD_KERNEND */ + md = file_findmetadata(kfp, MODINFOMD_KERNEND); + bcopy(&kernend, md->md_data, sizeof kernend); + + /* copy module list and metadata */ + (void)bi_copymodules64(addr); + + return(0); +} |
