main.c revision 200255
143561Skato/*- 243561Skato * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 343561Skato * All rights reserved. 443561Skato * 543561Skato * Redistribution and use in source and binary forms, with or without 643561Skato * modification, are permitted provided that the following conditions 743561Skato * are met: 843561Skato * 1. Redistributions of source code must retain the above copyright 943561Skato * notice, this list of conditions and the following disclaimer. 1043561Skato * 2. Redistributions in binary form must reproduce the above copyright 1143561Skato * notice, this list of conditions and the following disclaimer in the 1243561Skato * documentation and/or other materials provided with the distribution. 1343561Skato * 1443561Skato * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1543561Skato * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1643561Skato * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1743561Skato * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1843561Skato * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1943561Skato * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2043561Skato * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2143561Skato * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2243561Skato * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2343561Skato * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2443561Skato * SUCH DAMAGE. 2543561Skato */ 2643561Skato 27119880Sobrien#include <sys/cdefs.h> 28119880Sobrien__FBSDID("$FreeBSD: head/sys/boot/pc98/loader/main.c 200255 2009-12-08 13:06:35Z nyan $"); 29119880Sobrien 3043561Skato/* 3143561Skato * MD bootstrap main() and assorted miscellaneous 3243561Skato * commands. 3343561Skato */ 3443561Skato 3543561Skato#include <stand.h> 3643561Skato#include <string.h> 3743561Skato#include <machine/bootinfo.h> 38181436Sjhb#include <machine/psl.h> 3943561Skato#include <sys/reboot.h> 4043561Skato 4143561Skato#include "bootstrap.h" 4245241Skato#include "libi386/libi386.h" 4343561Skato#include "btxv86.h" 4443561Skato 4558871Skato#define KARGS_FLAGS_CD 0x1 4658871Skato#define KARGS_FLAGS_PXE 0x2 4758871Skato 4843561Skato/* Arguments passed in from the boot1/boot2 loader */ 4943561Skatostatic struct 5043561Skato{ 5143561Skato u_int32_t howto; 5243561Skato u_int32_t bootdev; 5358871Skato u_int32_t bootflags; 5458871Skato u_int32_t pxeinfo; 5543561Skato u_int32_t res2; 5643561Skato u_int32_t bootinfo; 5743561Skato} *kargs; 5843561Skato 5943561Skatostatic u_int32_t initial_howto; 6043561Skatostatic u_int32_t initial_bootdev; 6143561Skatostatic struct bootinfo *initial_bootinfo; 6243561Skato 6343561Skatostruct arch_switch archsw; /* MI/MD interface boundary */ 6443561Skato 6543561Skatostatic void extract_currdev(void); 6643561Skatostatic int isa_inb(int port); 6743561Skatostatic void isa_outb(int port, int value); 6868358Snyanvoid exit(int code); 6943561Skato 7043561Skato/* from vers.c */ 7143561Skatoextern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 7243561Skato 7343561Skato/* XXX debugging */ 7443561Skatoextern char end[]; 7543561Skato 76153600Snyanstatic void *heap_top; 77153600Snyanstatic void *heap_bottom; 78153600Snyan 7968358Snyanint 8043561Skatomain(void) 8143561Skato{ 8243561Skato int i; 8343561Skato 8443561Skato /* Pick up arguments */ 8543561Skato kargs = (void *)__args; 8643561Skato initial_howto = kargs->howto; 8743561Skato initial_bootdev = kargs->bootdev; 8858871Skato initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 8943561Skato 90181436Sjhb /* Initialize the v86 register set to a known-good state. */ 91181436Sjhb bzero(&v86, sizeof(v86)); 92181436Sjhb v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 93181436Sjhb 9443561Skato /* 9543561Skato * Initialise the heap as early as possible. Once this is done, malloc() is usable. 9643561Skato */ 9755342Snyan bios_getmem(); 9859167Skato 99200253Snyan#if defined(LOADER_BZIP2_SUPPORT) 100200255Snyan if (high_heap_size > 0) { 101200255Snyan heap_top = PTOV(high_heap_base + high_heap_size); 102200255Snyan heap_bottom = PTOV(high_heap_base); 103200255Snyan if (high_heap_base < memtop_copyin) 104200255Snyan memtop_copyin = high_heap_base; 105200255Snyan } else 106153600Snyan#endif 107200255Snyan { 108200255Snyan heap_top = (void *)PTOV(bios_basemem); 109200255Snyan heap_bottom = (void *)end; 110200255Snyan } 111153600Snyan setheap(heap_bottom, heap_top); 11258871Skato 11343561Skato /* 11443561Skato * XXX Chicken-and-egg problem; we want to have console output early, but some 11543561Skato * console attributes may depend on reading from eg. the boot device, which we 11643561Skato * can't do yet. 11743561Skato * 11843561Skato * We can use printf() etc. once this is done. 11943561Skato * If the previous boot stage has requested a serial console, prefer that. 12043561Skato */ 121150751Snyan bi_setboothowto(initial_howto); 122146698Sjhb if (initial_howto & RB_MULTIPLE) { 123146698Sjhb if (initial_howto & RB_SERIAL) 124146698Sjhb setenv("console", "comconsole vidconsole", 1); 125146698Sjhb else 126146698Sjhb setenv("console", "vidconsole comconsole", 1); 127146698Sjhb } else if (initial_howto & RB_SERIAL) 12843561Skato setenv("console", "comconsole", 1); 129146698Sjhb else if (initial_howto & RB_MUTE) 13066246Skato setenv("console", "nullconsole", 1); 13143561Skato cons_probe(); 13243561Skato 13343561Skato /* 13443561Skato * Initialise the block cache 13543561Skato */ 13643561Skato bcache_init(32, 512); /* 16k cache XXX tune this */ 13743561Skato 13843561Skato /* 13986131Snyan * Special handling for PXE and CD booting. 14058871Skato */ 141126970Snyan if (kargs->bootinfo == 0) { 14286131Snyan /* 14386131Snyan * We only want the PXE disk to try to init itself in the below 14486131Snyan * walk through devsw if we actually booted off of PXE. 14586131Snyan */ 14686131Snyan if (kargs->bootflags & KARGS_FLAGS_PXE) 14786131Snyan pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 14886131Snyan else if (kargs->bootflags & KARGS_FLAGS_CD) 14986131Snyan bc_add(initial_bootdev); 15058871Skato } 15158871Skato 152190046Snyan archsw.arch_autoload = i386_autoload; 153190046Snyan archsw.arch_getdev = i386_getdev; 154190046Snyan archsw.arch_copyin = i386_copyin; 155190046Snyan archsw.arch_copyout = i386_copyout; 156190046Snyan archsw.arch_readin = i386_readin; 157190046Snyan archsw.arch_isainb = isa_inb; 158190046Snyan archsw.arch_isaoutb = isa_outb; 159190046Snyan 16058871Skato /* 16143561Skato * March through the device switch probing for things. 16243561Skato */ 16343561Skato for (i = 0; devsw[i] != NULL; i++) 16443561Skato if (devsw[i]->dv_init != NULL) 16543561Skato (devsw[i]->dv_init)(); 16655342Snyan printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 167136891Snyan if (initial_bootinfo != NULL) { 168136891Snyan initial_bootinfo->bi_basemem = bios_basemem / 1024; 169136891Snyan initial_bootinfo->bi_extmem = bios_extmem / 1024; 170136891Snyan } 17143561Skato 17243561Skato printf("\n"); 17355342Snyan printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 17443561Skato printf("(%s, %s)\n", bootprog_maker, bootprog_date); 17543561Skato 17643561Skato extract_currdev(); /* set $currdev and $loaddev */ 17743561Skato setenv("LINES", "24", 1); /* optional */ 17843561Skato 17943561Skato interact(); /* doesn't return */ 18068358Snyan 18168358Snyan /* if we ever get here, it is an error */ 18268358Snyan return (1); 18343561Skato} 18443561Skato 18543561Skato/* 18643561Skato * Set the 'current device' by (if possible) recovering the boot device as 18743561Skato * supplied by the initial bootstrap. 18843561Skato * 18943561Skato * XXX should be extended for netbooting. 19043561Skato */ 19143561Skatostatic void 19243561Skatoextract_currdev(void) 19343561Skato{ 19468358Snyan struct i386_devdesc new_currdev; 195190046Snyan int major; 196190046Snyan int biosdev = -1; 19743561Skato 19858871Skato /* Assume we are booting from a BIOS disk by default */ 19968358Snyan new_currdev.d_dev = &biosdisk; 20043561Skato 20158871Skato /* new-style boot loaders such as pxeldr and cdldr */ 202126970Snyan if (kargs->bootinfo == 0) { 20358871Skato if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 20486131Snyan /* we are booting from a CD with cdboot */ 20586131Snyan new_currdev.d_dev = &bioscd; 206163897Smarcel new_currdev.d_unit = bc_bios2unit(initial_bootdev); 20758871Skato } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 20858871Skato /* we are booting from pxeldr */ 20968358Snyan new_currdev.d_dev = &pxedisk; 210163897Smarcel new_currdev.d_unit = 0; 21158871Skato } else { 21258871Skato /* we don't know what our boot device is */ 21368358Snyan new_currdev.d_kind.biosdisk.slice = -1; 21468358Snyan new_currdev.d_kind.biosdisk.partition = 0; 21558871Skato biosdev = -1; 21658871Skato } 21758871Skato } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 21843561Skato /* The passed-in boot device is bad */ 21968358Snyan new_currdev.d_kind.biosdisk.slice = -1; 22068358Snyan new_currdev.d_kind.biosdisk.partition = 0; 22143561Skato biosdev = -1; 22243561Skato } else { 223172924Snyan new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1; 22468358Snyan new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 22543561Skato biosdev = initial_bootinfo->bi_bios_dev; 22643561Skato major = B_TYPE(initial_bootdev); 22743561Skato 22843561Skato /* 22943561Skato * If we are booted by an old bootstrap, we have to guess at the BIOS 230160964Syar * unit number. We will lose if there is more than one disk type 23143561Skato * and we are not booting from the lowest-numbered disk type 23243561Skato * (ie. SCSI when IDE also exists). 23343561Skato */ 23453218Snyan if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 23544463Skato if (B_TYPE(initial_bootdev) == 6) 23644463Skato biosdev = 0x30 + B_UNIT(initial_bootdev); 23744463Skato else 23844463Skato biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 23953218Snyan } 24043561Skato } 24186131Snyan new_currdev.d_type = new_currdev.d_dev->dv_type; 24243561Skato 24358871Skato /* 24458871Skato * If we are booting off of a BIOS disk and we didn't succeed in determining 24558871Skato * which one we booted off of, just use disk0: as a reasonable default. 24658871Skato */ 24786131Snyan if ((new_currdev.d_type == biosdisk.dv_type) && 248163897Smarcel ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) { 24943561Skato printf("Can't work out which disk we are booting from.\n" 25043561Skato "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 251163897Smarcel new_currdev.d_unit = 0; 25243561Skato } 25368358Snyan env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 25468358Snyan i386_setcurrdev, env_nounset); 25568358Snyan env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 25668358Snyan env_nounset); 25743561Skato} 25843561Skato 25943561SkatoCOMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 26043561Skato 26143561Skatostatic int 26243561Skatocommand_reboot(int argc, char *argv[]) 26343561Skato{ 26459535Snyan int i; 26543561Skato 26659535Snyan for (i = 0; devsw[i] != NULL; ++i) 26759535Snyan if (devsw[i]->dv_cleanup != NULL) 26859535Snyan (devsw[i]->dv_cleanup)(); 26959535Snyan 27043561Skato printf("Rebooting...\n"); 27143561Skato delay(1000000); 27243561Skato __exit(0); 27343561Skato} 27443561Skato 27543561Skato/* provide this for panic, as it's not in the startup code */ 27643561Skatovoid 27743561Skatoexit(int code) 27843561Skato{ 27943561Skato __exit(code); 28043561Skato} 28143561Skato 28243561SkatoCOMMAND_SET(heap, "heap", "show heap usage", command_heap); 28343561Skato 28443561Skatostatic int 28543561Skatocommand_heap(int argc, char *argv[]) 28643561Skato{ 28743561Skato mallocstats(); 288153600Snyan printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 289153600Snyan sbrk(0), heap_top); 29043561Skato return(CMD_OK); 29143561Skato} 29243561Skato 29343561Skato/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 29443561Skatostatic int 29543561Skatoisa_inb(int port) 29643561Skato{ 29743561Skato u_char data; 29843561Skato 29943561Skato if (__builtin_constant_p(port) && 30043561Skato (((port) & 0xffff) < 0x100) && 30143561Skato ((port) < 0x10000)) { 30243561Skato __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 30343561Skato } else { 30443561Skato __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 30543561Skato } 30643561Skato return(data); 30743561Skato} 30843561Skato 30943561Skatostatic void 31043561Skatoisa_outb(int port, int value) 31143561Skato{ 31243561Skato u_char al = value; 31343561Skato 31443561Skato if (__builtin_constant_p(port) && 31543561Skato (((port) & 0xffff) < 0x100) && 31643561Skato ((port) < 0x10000)) { 31743561Skato __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 31843561Skato } else { 31943561Skato __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 32043561Skato } 32143561Skato} 32243561Skato 323