593bbd2195
to get the physical address doesn't work for all values of KVA_PAGES, while masking 8 MSBs works for all values of KVA_PAGES that are multiple of 4 for non-PAE and 8 for PAE. (This leaves us limited with 12MB for non-PAE kernels and 14MB for PAE kernels.) To get things right, we'd need to subtract the KERNBASE from the virtual address (but KERNBASE is not easy to figure out from here), or have physical addresses set properly in the ELF headers. Discussed with: jhb
406 lines
11 KiB
C
406 lines
11 KiB
C
/*
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* Mach Operating System
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* Copyright (c) 1992, 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*
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* from: Mach, [92/04/03 16:51:14 rvb]
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*/
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/*
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Copyright 1988, 1989, 1990, 1991, 1992
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by Intel Corporation, Santa Clara, California.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appears in all
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copies and that both the copyright notice and this permission notice
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appear in supporting documentation, and that the name of Intel
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not be used in advertising or publicity pertaining to distribution
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of the software without specific, written prior permission.
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INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
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IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "boot.h"
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#include <a.out.h>
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#include <sys/reboot.h>
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#include <machine/bootinfo.h>
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#define ouraddr (BOOTSEG << 4) /* XXX */
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#define BOOT_CONFIG_SIZE 512
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#define BOOT_HELP_SIZE 2048
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#define KERNEL_CONFIG_SIZE 512
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#define NAMEBUF_LEN 1024 /* oversized to defend against gets() */
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static char boot_config[BOOT_CONFIG_SIZE];
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static char boot_help[BOOT_HELP_SIZE];
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char *name;
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static char kernel_config[KERNEL_CONFIG_SIZE];
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static char kernel_config_namebuf[NAMEBUF_LEN + sizeof "config"];
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static char linebuf[NAMEBUF_LEN];
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static char namebuf[NAMEBUF_LEN];
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static struct bootinfo bootinfo;
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int loadflags;
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static void getbootdev(char *ptr, int *howto);
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static void loadprog(void);
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static void readfile(char *path, char *buf, size_t nbytes);
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/* NORETURN */
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void
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boot(int drive)
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{
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int i, ret;
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unsigned char disk_equips;
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/* Pick up the story from the Bios on geometry of disks */
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for(ret = 0; ret < 2; ret ++) {
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if (*(unsigned char*)V(0xA155d) & (1 << ret)) {
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bootinfo.bi_bios_geom[ret] = get_diskinfo(ret + 0x80);
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}
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}
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bootinfo.bi_basemem = memsize(0);
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bootinfo.bi_extmem = memsize(1);
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bootinfo.bi_memsizes_valid = 1;
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gateA20();
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/* set machine type to PC98_SYSTEM_PARAMETER */
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machine_check();
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/*
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* The default boot device is the first partition in the
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* compatibility slice on the boot drive.
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*/
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dosdev = drive;
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maj = (drive&0x70) >> 3; /* a good first bet */
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if (maj == 4) { /* da */
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disk_equips = *(unsigned char *)V(0xA1482);
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unit = 0;
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for (i=0; i<(drive&0x0f); i++) {
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int media = ((unsigned *)V(0xA1460))[i] & 0x1F;
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if ((disk_equips >> i) & 1) /* HD */
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unit++;
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else if (media == 7) /* MO */
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unit++;
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}
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} else {
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unit = drive & 0x0f;
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}
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readfile("boot.config", boot_config, BOOT_CONFIG_SIZE);
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name = "/boot/loader";
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if (boot_config[0] != '\0') {
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getbootdev(boot_config, &loadflags);
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printf("boot.config: %s", boot_config);
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if (openrd() != 0)
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name = "kernel";
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}
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loadstart:
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/* print this all each time.. (saves space to do so) */
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/* If we have looped, use the previous entries as defaults */
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printf("\r \n>> FreeBSD BOOT @ 0x%x: %d/%d k of memory, %s%s console\n"
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"Boot default: %d:%s(%d,%c)%s\n"
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"%s\n"
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"boot: ",
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ouraddr, bootinfo.bi_basemem, bootinfo.bi_extmem,
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(loadflags & RB_SERIAL) ? "serial" : "internal",
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(loadflags & RB_DUAL) ? "/dual" : "",
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dosdev & 0x0f, devs[maj], unit, 'a' + part,
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name ? name : "*specify_a_kernel_name*",
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boot_help);
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/*
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* Ignore flags from previous attempted boot, if any.
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* XXX this is now too strict. Settings given in boot.config should
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* not be changed.
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*/
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loadflags &= (RB_DUAL | RB_SERIAL);
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/*
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* Be paranoid and make doubly sure that the input buffer is empty.
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*/
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if (loadflags & (RB_DUAL | RB_SERIAL))
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init_serial();
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if (!gets(linebuf))
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putchar('\n');
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else
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getbootdev(linebuf, &loadflags);
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if (name == NULL)
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goto loadstart;
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ret = openrd();
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if (ret != 0) {
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if (ret > 0)
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printf("Can't find %s\n", name);
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goto loadstart;
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}
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/* if (inode.i_mode&IEXEC)
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loadflags |= RB_KDB;
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*/
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loadprog();
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goto loadstart;
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}
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static void
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loadprog(void)
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{
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struct exec head;
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int startaddr;
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int addr; /* physical address.. not directly useable */
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int bootdev;
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int i;
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unsigned pad;
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char *s, *t;
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read((void *)&head, sizeof(head));
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if ( N_BADMAG(head)) {
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printf("Invalid format!\n");
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return;
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}
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poff = N_TXTOFF(head);
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/*if(poff==0)
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poff = 32;*/
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/*
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* We assume that the entry address is the same as the lowest text
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* address and that the kernel startup code handles relocation by
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* this address rounded down to a multiple of 16M.
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*/
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startaddr = head.a_entry & 0x00FFFFFF;
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addr = startaddr;
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printf("Booting %d:%s(%d,%c)%s @ 0x%x\n"
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, dosdev & 0x0f
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, devs[maj]
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, unit
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, 'a'+part
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, name
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, addr);
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if(addr < 0x00100000)
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{
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/*
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* Bail out, instead of risking to damage the BIOS
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* variables, the loader, or the adapter memory area.
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* We don't support loading below 1 MB any more.
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*/
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printf("Start address too low\n");
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return;
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}
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printf("text=0x%x ", head.a_text);
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/********************************************************/
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/* LOAD THE TEXT SEGMENT */
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/********************************************************/
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xread((void *)addr, head.a_text);
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addr += head.a_text;
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/********************************************************/
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/* Load the Initialised data after the text */
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/********************************************************/
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while (addr & PAGE_MASK)
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*(char *)addr++ = 0;
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printf("data=0x%x ", head.a_data);
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xread((void *)addr, head.a_data);
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addr += head.a_data;
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/********************************************************/
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/* Skip over the uninitialised data */
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/* (but clear it) */
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/********************************************************/
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printf("bss=0x%x ", head.a_bss);
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/*
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* XXX however, we should be checking that we don't load ... into
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* nonexistent memory. A full symbol table is unlikely to fit on 4MB
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* machines.
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*/
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/* kzip & kernel will zero their own bss */
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addr += head.a_bss;
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/* Pad to a page boundary. */
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pad = (unsigned)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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bootinfo.bi_symtab = addr;
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/********************************************************/
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/* Copy the symbol table size */
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/********************************************************/
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pcpy(&head.a_syms, (void *)addr, sizeof(head.a_syms));
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addr += sizeof(head.a_syms);
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/********************************************************/
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/* Load the symbol table */
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/********************************************************/
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printf("symbols=[+0x%x+0x%x+0x%x", pad, sizeof(head.a_syms),
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head.a_syms);
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xread((void *)addr, head.a_syms);
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addr += head.a_syms;
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/********************************************************/
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/* Load the string table size */
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/********************************************************/
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read((void *)&i, sizeof(int));
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pcpy(&i, (void *)addr, sizeof(int));
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i -= sizeof(int);
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addr += sizeof(int);
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/********************************************************/
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/* Load the string table */
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/********************************************************/
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printf("+0x%x+0x%x]\n", sizeof(int), i);
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xread((void *)addr, i);
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addr += i;
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bootinfo.bi_esymtab = addr;
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/*
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* For backwards compatibility, use the previously-unused adaptor
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* and controller bitfields to hold the slice number.
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*/
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bootdev = MAKEBOOTDEV(maj, (slice >> 4), slice & 0xf, unit, part);
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bootinfo.bi_version = BOOTINFO_VERSION;
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bootinfo.bi_kernelname = (u_int32_t)(name + ouraddr);
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bootinfo.bi_nfs_diskless = 0;
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bootinfo.bi_size = sizeof(bootinfo);
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bootinfo.bi_bios_dev = dosdev;
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/*
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* Load the kernel config file (if any). Its name is given by
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* appending ".config" to the kernel name. Build the name inline
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* because no str*() functions are available. The file has to be
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* copied to &disklabel for userconfig. It can't be loaded there
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* directly because the label is used late in readfile() in some
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* unusual cases.
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*/
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s = name;
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t = kernel_config_namebuf;
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do
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;
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while ((*t++ = *s++) != '\0');
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s = ".config";
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--t;
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do
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;
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while ((*t++ = *s++) != '\0');
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readfile(kernel_config_namebuf, kernel_config, KERNEL_CONFIG_SIZE);
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pcpy(kernel_config, (char *)&disklabel + ouraddr, KERNEL_CONFIG_SIZE);
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printf("total=0x%x entry point=0x%x\n", addr, startaddr);
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startprog(startaddr, loadflags | RB_BOOTINFO, bootdev,
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(unsigned)&bootinfo + ouraddr);
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}
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static void
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readfile(char *path, char *buf, size_t nbytes)
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{
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int openstatus;
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buf[0] = '\0';
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name = path;
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openstatus = openrd();
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if (openstatus == 0) {
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/* XXX no way to determine file size. */
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read(buf, nbytes);
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}
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buf[nbytes - 1] = '\0';
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}
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static void
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getbootdev(char *ptr, int *howto)
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{
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char c;
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int f;
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char *p;
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/* Copy the flags to save some bytes. */
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f = *howto;
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c = *ptr;
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for (;;) {
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nextarg:
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while (c == ' ' || c == '\n')
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c = *++ptr;
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if (c == '-')
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while ((c = *++ptr) != '\0') {
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if (c == ' ' || c == '\n')
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goto nextarg;
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if (c == 'a')
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f |= RB_ASKNAME;
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if (c == 'C')
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f |= RB_CDROM;
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if (c == 'D')
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f ^= RB_DUAL;
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if (c == 'd')
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f |= RB_KDB;
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if (c == 'g')
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f |= RB_GDB;
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if (c == 'h')
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f ^= RB_SERIAL;
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if (c == 'P')
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f |= RB_PROBEKBD;
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if (c == 'r')
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f |= RB_DFLTROOT;
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if (c == 's')
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f |= RB_SINGLE;
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if (c == 'v')
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f |= RB_VERBOSE;
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}
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if (c == '\0')
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break;
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p = name = namebuf;
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while (c != '\0' && c != ' ' && c != '\n') {
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*p++ = c;
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c = *++ptr;
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}
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*p = '\0';
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}
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if (f & RB_PROBEKBD) {
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if (probe_keyboard()) {
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f |= RB_DUAL | RB_SERIAL;
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printf("No keyboard found\n");
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} else
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printf("Keyboard found\n");
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}
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if (f & (RB_DUAL | RB_SERIAL))
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init_serial();
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*howto = f;
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}
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