/* $NetBSD: bootinfo.c,v 1.5 2016/08/04 18:07:43 scole Exp $ */ /*- * 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. */ #include /* __FBSDID("$FreeBSD: src/sys/boot/efi/libefi/bootinfo.c,v 1.10 2004/01/04 23:28:16 obrien Exp $"); */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "bootstrap.h" static EFI_GUID hcdp = HCDP_TABLE_GUID; /* * 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_single", RB_SINGLE}, {"boot_nosync", RB_NOSYNC}, {"boot_halt", RB_HALT}, {"boot_kdb", RB_KDB}, {"boot_rdonly", RB_RDONLY}, {"boot_dump", RB_DUMP}, {"boot_miniroot", RB_MINIROOT}, {"boot_userconf", RB_USERCONF}, {NULL, 0} }; extern char *efi_fmtdev(void *vdev); 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) BOOT_FLAG(*cp, howto); 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; 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. */ vaddr_t bi_copyenv(vaddr_t addr) { struct env_var *ep; /* traverse the environment */ for (ep = environ; ep != NULL; ep = ep->ev_next) { efi_copyin(ep->ev_name, addr, strlen(ep->ev_name)); addr += strlen(ep->ev_name); efi_copyin("=", addr, 1); addr++; if (ep->ev_value != NULL) { efi_copyin(ep->ev_value, addr, strlen(ep->ev_value)); addr += strlen(ep->ev_value); } efi_copyin("", addr, 1); addr++; } efi_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 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); \ efi_copyin(&x, a, sizeof(x)); \ a += sizeof(x); \ } #define MOD_STR(t, a, s) { \ COPY32(t, a); \ COPY32(strlen(s) + 1, a); \ efi_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); \ efi_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); \ efi_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); \ } /* * 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 bootinfo *bi, struct preloaded_file *fp, UINTN *mapkey, UINTN pages) { char *rootdevname; struct efi_devdesc *rootdev; struct preloaded_file *xp; vaddr_t addr, bootinfo_addr; vaddr_t ssym, esym; struct file_metadata *md; EFI_STATUS status; UINTN bisz, key; /* * Version 1 bootinfo. */ bi->bi_magic = BOOTINFO_MAGIC; bi->bi_version = 1; /* * Calculate boothowto. */ bi->bi_boothowto = bi_getboothowto(fp->f_args); /* * Stash EFI System Table. */ bi->bi_systab = (u_int64_t) ST; /* * 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"); efi_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(efi_fmtdev((void *)rootdev)); free(rootdev); ssym = esym = 0; ssym = fp->marks[MARK_SYM]; esym = fp->marks[MARK_END]; if (ssym == 0 || esym == 0) ssym = esym = 0; /* sanity */ bi->bi_symtab = ssym; bi->bi_esymtab = esym; bi->bi_hcdp = (uint64_t)efi_get_table(&hcdp); /* DIG64 HCDP table addr. */ fpswa_init(&bi->bi_fpswa); /* find FPSWA interface */ /* 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 = (addr + PAGE_MASK) & ~PAGE_MASK; /* copy our environment */ bi->bi_envp = addr; addr = bi_copyenv(addr); /* pad to a page boundary */ addr = (addr + PAGE_MASK) & ~PAGE_MASK; /* all done copying stuff in, save end of loaded object space */ bi->bi_kernend = addr; /* * Read the memory map and stash it after bootinfo. Align the memory map * on a 16-byte boundary (the bootinfo block is page aligned). */ bisz = (sizeof(struct bootinfo) + 0x0f) & ~0x0f; bi->bi_memmap = ((u_int64_t)bi) + bisz; bi->bi_memmap_size = EFI_PAGE_SIZE * pages - bisz; status = BS->GetMemoryMap(&bi->bi_memmap_size, (EFI_MEMORY_DESCRIPTOR *)bi->bi_memmap, &key, &bi->bi_memdesc_size, &bi->bi_memdesc_version); if (EFI_ERROR(status)) { printf("bi_load: Can't read memory map\n"); return EINVAL; } *mapkey = key; return(0); }