627249c7b1
for our use. Use the same search order for BIOS memory size functions as the kernel will later use. Allow the loader to use all of the detected physical memory (this will greatly help people trying to load enormous memory disk images). More correctly handle running out of memory when loading an object. Use the end of base memory for the top of the heap, rather than blindly hoping that there is 384k left. Add copyrights to a couple of files I forgot.
335 lines
9.2 KiB
C
335 lines
9.2 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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* $FreeBSD$
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*/
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#include <stand.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/bootinfo.h>
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#include "bootstrap.h"
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#include "libi386.h"
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#include "btxv86.h"
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static struct bootinfo bi;
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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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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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{NULL, 0}
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};
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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 '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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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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i386_copyin(ep->ev_name, addr, strlen(ep->ev_name));
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addr += strlen(ep->ev_name);
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i386_copyin("=", addr, 1);
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addr++;
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if (ep->ev_value != NULL) {
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i386_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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i386_copyin("", addr, 1);
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addr++;
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}
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i386_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 preceeded 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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i386_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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i386_copyin(s, a, strlen(s) + 1); \
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a += roundup(strlen(s) + 1, sizeof(u_long));\
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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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i386_copyin(&s, a, sizeof(s)); \
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a += roundup(sizeof(s), sizeof(u_long)); \
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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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i386_copyin(mm->md_data, a, mm->md_size); \
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a += roundup(mm->md_size, sizeof(u_long));\
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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 loaded_module *mp;
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struct module_metadata *md;
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/* start with the first module on the list, should be the kernel */
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for (mp = mod_findmodule(NULL, NULL); mp != NULL; mp = mp->m_next) {
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MOD_NAME(addr, mp->m_name); /* this field must come first */
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MOD_TYPE(addr, mp->m_type);
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if (mp->m_args)
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MOD_ARGS(addr, mp->m_args);
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MOD_ADDR(addr, mp->m_addr);
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MOD_SIZE(addr, mp->m_size);
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for (md = mp->m_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 i386 kernel.
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*
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* - The 'boothowto' argument is constructed
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* - The 'botdev' argument is constructed
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* - The 'bootinfo' struct is constructed, and copied into the kernel space.
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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(char *args, int *howtop, int *bootdevp, vm_offset_t *bip)
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{
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struct loaded_module *xp;
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struct i386_devdesc *rootdev;
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vm_offset_t addr, bootinfo_addr;
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char *rootdevname;
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int bootdevnr, i;
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u_int pad;
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char *kernelname;
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const char *kernelpath;
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*howtop = bi_getboothowto(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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i386_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(i386_fmtdev((void *)rootdev));
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/* Do legacy rootdev guessing */
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switch(rootdev->d_type) {
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case DEVT_DISK:
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/* pass in the BIOS device number of the current disk */
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bi.bi_bios_dev = bd_unit2bios(rootdev->d_kind.biosdisk.unit);
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bootdevnr = bd_getdev(rootdev);
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if (bootdevnr != -1)
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break;
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printf("root device %s invalid\n", i386_fmtdev(rootdev));
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return(EINVAL);
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default:
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printf("WARNING - don't know how to boot from device type %d\n", rootdev->d_type);
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}
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free(rootdev);
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*bootdevp = bootdevnr;
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/* legacy bootinfo structure */
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bi.bi_version = BOOTINFO_VERSION;
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bi.bi_kernelname = 0; /* XXX char * -> kernel name */
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bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */
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bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */
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for (i = 0; i < N_BIOS_GEOM; i++)
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bi.bi_bios_geom[i] = bd_getbigeom(i);
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bi.bi_size = sizeof(bi);
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bi.bi_memsizes_valid = 1;
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bi.bi_basemem = bios_basemem / 1024;
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bi.bi_extmem = bios_extmem / 1024;
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/* find the last module in the chain */
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addr = 0;
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for (xp = mod_findmodule(NULL, NULL); xp != NULL; xp = xp->m_next) {
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if (addr < (xp->m_addr + xp->m_size))
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addr = xp->m_addr + xp->m_size;
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}
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/* pad to a page boundary */
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pad = (u_int)addr & PAGE_MASK;
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if (pad != 0) {
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pad = PAGE_SIZE - pad;
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addr += pad;
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}
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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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pad = (u_int)addr & PAGE_MASK;
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if (pad != 0) {
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pad = PAGE_SIZE - pad;
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addr += pad;
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}
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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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*howtop |= RB_BOOTINFO; /* it's there now */
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/*
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* Get the kernel name, strip off any device prefix.
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*/
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kernelname = getenv("kernelname");
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i386_getdev(NULL, kernelname, &kernelpath);
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bi.bi_kernelname = VTOP(kernelpath);
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*bip = VTOP(&bi);
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return(0);
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}
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