317 lines
8.4 KiB
C
317 lines
8.4 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stand.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/reboot.h>
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#include <sys/linker.h>
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#include <machine/elf.h>
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#include <machine/bootinfo.h>
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#include "bootstrap.h"
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/*
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* Return a 'boothowto' value corresponding to the kernel arguments in
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* (kargs) and any relevant environment variables.
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*/
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static struct
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{
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const char *ev;
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int mask;
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} howto_names[] = {
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{"boot_askname", RB_ASKNAME},
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{"boot_cdrom", RB_CDROM},
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{"boot_userconfig", RB_CONFIG},
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{"boot_ddb", RB_KDB},
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{"boot_gdb", RB_GDB},
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{"boot_single", RB_SINGLE},
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{"boot_verbose", RB_VERBOSE},
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{"boot_multicons", RB_MULTIPLE},
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{"boot_serial", RB_SERIAL},
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{NULL, 0}
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};
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extern char *ski_fmtdev(void *vdev);
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extern int ski_init_stubs(struct bootinfo *);
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int
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bi_getboothowto(char *kargs)
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{
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char *cp;
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int howto;
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int active;
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int i;
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/* Parse kargs */
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howto = 0;
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if (kargs != NULL) {
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cp = kargs;
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active = 0;
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while (*cp != 0) {
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if (!active && (*cp == '-')) {
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active = 1;
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} else if (active)
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switch (*cp) {
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case 'a':
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howto |= RB_ASKNAME;
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break;
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case 'c':
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howto |= RB_CONFIG;
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break;
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case 'C':
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howto |= RB_CDROM;
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break;
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case 'd':
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howto |= RB_KDB;
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break;
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case 'm':
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howto |= RB_MUTE;
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break;
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case 'g':
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howto |= RB_GDB;
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break;
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case 'h':
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howto |= RB_SERIAL;
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break;
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case 'r':
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howto |= RB_DFLTROOT;
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break;
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case 's':
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howto |= RB_SINGLE;
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break;
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case 'v':
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howto |= RB_VERBOSE;
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break;
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default:
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active = 0;
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break;
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}
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cp++;
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}
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}
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/* get equivalents from the environment */
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for (i = 0; howto_names[i].ev != NULL; i++)
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if (getenv(howto_names[i].ev) != NULL)
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howto |= howto_names[i].mask;
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if (!strcmp(getenv("console"), "comconsole"))
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howto |= RB_SERIAL;
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if (!strcmp(getenv("console"), "nullconsole"))
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howto |= RB_MUTE;
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return(howto);
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}
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/*
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* Copy the environment into the load area starting at (addr).
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* Each variable is formatted as <name>=<value>, with a single nul
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* separating each variable, and a double nul terminating the environment.
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*/
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vm_offset_t
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bi_copyenv(vm_offset_t addr)
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{
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struct env_var *ep;
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/* traverse the environment */
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for (ep = environ; ep != NULL; ep = ep->ev_next) {
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ski_copyin(ep->ev_name, addr, strlen(ep->ev_name));
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addr += strlen(ep->ev_name);
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ski_copyin("=", addr, 1);
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addr++;
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if (ep->ev_value != NULL) {
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ski_copyin(ep->ev_value, addr, strlen(ep->ev_value));
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addr += strlen(ep->ev_value);
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}
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ski_copyin("", addr, 1);
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addr++;
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}
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ski_copyin("", addr, 1);
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addr++;
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return(addr);
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}
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/*
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* Copy module-related data into the load area, where it can be
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* used as a directory for loaded modules.
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*
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* Module data is presented in a self-describing format. Each datum
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* is preceded by a 32-bit identifier and a 32-bit size field.
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*
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* Currently, the following data are saved:
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*
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* MOD_NAME (variable) module name (string)
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* MOD_TYPE (variable) module type (string)
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* MOD_ARGS (variable) module parameters (string)
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* MOD_ADDR sizeof(vm_offset_t) module load address
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* MOD_SIZE sizeof(size_t) module size
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* MOD_METADATA (variable) type-specific metadata
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*/
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#define COPY32(v, a) { \
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u_int32_t x = (v); \
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ski_copyin(&x, a, sizeof(x)); \
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a += sizeof(x); \
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}
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#define MOD_STR(t, a, s) { \
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COPY32(t, a); \
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COPY32(strlen(s) + 1, a); \
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ski_copyin(s, a, strlen(s) + 1); \
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a += roundup(strlen(s) + 1, sizeof(u_int64_t));\
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}
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#define MOD_NAME(a, s) MOD_STR(MODINFO_NAME, a, s)
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#define MOD_TYPE(a, s) MOD_STR(MODINFO_TYPE, a, s)
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#define MOD_ARGS(a, s) MOD_STR(MODINFO_ARGS, a, s)
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#define MOD_VAR(t, a, s) { \
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COPY32(t, a); \
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COPY32(sizeof(s), a); \
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ski_copyin(&s, a, sizeof(s)); \
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a += roundup(sizeof(s), sizeof(u_int64_t)); \
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}
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#define MOD_ADDR(a, s) MOD_VAR(MODINFO_ADDR, a, s)
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#define MOD_SIZE(a, s) MOD_VAR(MODINFO_SIZE, a, s)
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#define MOD_METADATA(a, mm) { \
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COPY32(MODINFO_METADATA | mm->md_type, a); \
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COPY32(mm->md_size, a); \
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ski_copyin(mm->md_data, a, mm->md_size); \
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a += roundup(mm->md_size, sizeof(u_int64_t));\
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}
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#define MOD_END(a) { \
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COPY32(MODINFO_END, a); \
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COPY32(0, a); \
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}
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vm_offset_t
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bi_copymodules(vm_offset_t addr)
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{
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struct preloaded_file *fp;
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struct file_metadata *md;
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/* start with the first module on the list, should be the kernel */
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for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
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MOD_NAME(addr, fp->f_name); /* this field must come first */
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MOD_TYPE(addr, fp->f_type);
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if (fp->f_args)
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MOD_ARGS(addr, fp->f_args);
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MOD_ADDR(addr, fp->f_addr);
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MOD_SIZE(addr, fp->f_size);
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for (md = fp->f_metadata; md != NULL; md = md->md_next)
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if (!(md->md_type & MODINFOMD_NOCOPY))
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MOD_METADATA(addr, md);
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}
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MOD_END(addr);
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return(addr);
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}
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/*
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* Load the information expected by an alpha kernel.
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*
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* - The kernel environment is copied into kernel space.
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* - Module metadata are formatted and placed in kernel space.
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*/
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int
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bi_load(struct bootinfo *bi, struct preloaded_file *fp, char *args)
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{
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char *rootdevname;
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struct ski_devdesc *rootdev;
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struct preloaded_file *xp;
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vm_offset_t addr, bootinfo_addr;
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char *kernelname;
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vm_offset_t ssym, esym;
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struct file_metadata *md;
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/*
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* Version 1 bootinfo.
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*/
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bi->bi_magic = BOOTINFO_MAGIC;
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bi->bi_version = 1;
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/*
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* Calculate boothowto.
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*/
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bi->bi_boothowto = bi_getboothowto(fp->f_args);
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/*
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* Allow the environment variable 'rootdev' to override the supplied device
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* This should perhaps go to MI code and/or have $rootdev tested/set by
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* MI code before launching the kernel.
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*/
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rootdevname = getenv("rootdev");
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ski_getdev((void **)(&rootdev), rootdevname, NULL);
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if (rootdev == NULL) { /* bad $rootdev/$currdev */
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printf("can't determine root device\n");
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return(EINVAL);
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}
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/* Try reading the /etc/fstab file to select the root device */
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getrootmount(ski_fmtdev((void *)rootdev));
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free(rootdev);
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ssym = esym = 0;
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if ((md = file_findmetadata(fp, MODINFOMD_SSYM)) != NULL)
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ssym = *((vm_offset_t *)&(md->md_data));
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if ((md = file_findmetadata(fp, MODINFOMD_ESYM)) != NULL)
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esym = *((vm_offset_t *)&(md->md_data));
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if (ssym == 0 || esym == 0)
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ssym = esym = 0; /* sanity */
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bi->bi_symtab = ssym;
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bi->bi_esymtab = esym;
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/* find the last module in the chain */
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addr = 0;
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for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
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if (addr < (xp->f_addr + xp->f_size))
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addr = xp->f_addr + xp->f_size;
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}
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/* pad to a page boundary */
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addr = (addr + PAGE_MASK) & ~PAGE_MASK;
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/* copy our environment */
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bi->bi_envp = addr;
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addr = bi_copyenv(addr);
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/* pad to a page boundary */
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addr = (addr + PAGE_MASK) & ~PAGE_MASK;
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/* copy module list and metadata */
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bi->bi_modulep = addr;
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addr = bi_copymodules(addr);
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/* all done copying stuff in, save end of loaded object space */
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bi->bi_kernend = addr;
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return (ski_init_stubs(bi));
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}
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