main.c revision 59535
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 * 2650477Speter * $FreeBSD: head/sys/boot/pc98/loader/main.c 59535 2000-04-23 09:33:31Z nyan $ 2743561Skato */ 2843561Skato 2943561Skato/* 3043561Skato * MD bootstrap main() and assorted miscellaneous 3143561Skato * commands. 3243561Skato */ 3343561Skato 3443561Skato#include <stand.h> 3543561Skato#include <string.h> 3643561Skato#include <machine/bootinfo.h> 3743561Skato#include <sys/reboot.h> 3843561Skato 3943561Skato#include "bootstrap.h" 4045241Skato#include "libi386/libi386.h" 4143561Skato#include "btxv86.h" 4243561Skato 4358871Skato#define KARGS_FLAGS_CD 0x1 4458871Skato#define KARGS_FLAGS_PXE 0x2 4558871Skato 4643561Skato/* Arguments passed in from the boot1/boot2 loader */ 4743561Skatostatic struct 4843561Skato{ 4943561Skato u_int32_t howto; 5043561Skato u_int32_t bootdev; 5158871Skato u_int32_t bootflags; 5258871Skato u_int32_t pxeinfo; 5343561Skato u_int32_t res2; 5443561Skato u_int32_t bootinfo; 5543561Skato} *kargs; 5643561Skato 5743561Skatostatic u_int32_t initial_howto; 5843561Skatostatic u_int32_t initial_bootdev; 5943561Skatostatic struct bootinfo *initial_bootinfo; 6043561Skato 6143561Skatostruct arch_switch archsw; /* MI/MD interface boundary */ 6243561Skato 6343561Skatostatic void extract_currdev(void); 6443561Skatostatic int isa_inb(int port); 6543561Skatostatic void isa_outb(int port, int value); 6643561Skato 6743561Skato/* from vers.c */ 6843561Skatoextern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 6943561Skato 7043561Skato/* XXX debugging */ 7143561Skatoextern char end[]; 7243561Skato 7359167Skato/* XXX - I dont know why we have to do this, but it helps. */ 7459167Skato#if defined(LOADER_NFS_SUPPORT) || defined(LOADER_TFTP_SUPPORT) 7559167Skatochar Heap[200*1024]; 7659167Skato#endif 7759167Skato 7843561Skatovoid 7943561Skatomain(void) 8043561Skato{ 8143561Skato int i; 8243561Skato 8343561Skato /* Pick up arguments */ 8443561Skato kargs = (void *)__args; 8543561Skato initial_howto = kargs->howto; 8643561Skato initial_bootdev = kargs->bootdev; 8758871Skato initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 8843561Skato 8943561Skato /* 9043561Skato * Initialise the heap as early as possible. Once this is done, malloc() is usable. 9143561Skato */ 9255342Snyan bios_getmem(); 9359167Skato 9459167Skato /* XXX - I dont know why we have to do this, but it helps PXE. */ 9559167Skato#if defined(LOADER_NFS_SUPPORT) || defined(LOADER_TFTP_SUPPORT) 9659167Skato setheap(Heap, Heap+sizeof(Heap)); 9759167Skato#else 9855342Snyan setheap((void *)end, (void *)bios_basemem); 9959167Skato#endif 10058871Skato 10143561Skato /* 10243561Skato * XXX Chicken-and-egg problem; we want to have console output early, but some 10343561Skato * console attributes may depend on reading from eg. the boot device, which we 10443561Skato * can't do yet. 10543561Skato * 10643561Skato * We can use printf() etc. once this is done. 10743561Skato * If the previous boot stage has requested a serial console, prefer that. 10843561Skato */ 10943561Skato if (initial_howto & RB_SERIAL) 11043561Skato setenv("console", "comconsole", 1); 11143561Skato cons_probe(); 11243561Skato 11343561Skato /* 11443561Skato * Initialise the block cache 11543561Skato */ 11643561Skato bcache_init(32, 512); /* 16k cache XXX tune this */ 11743561Skato 11843561Skato /* 11958871Skato * We only want the PXE disk to try to init itself in the below walk through 12058871Skato * devsw if we actually booted off of PXE. 12158871Skato */ 12258871Skato if((kargs->bootinfo == NULL) && 12358871Skato ((kargs->bootflags & KARGS_FLAGS_PXE) != 0)) { 12458871Skato pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 12558871Skato } 12658871Skato 12758871Skato /* 12843561Skato * March through the device switch probing for things. 12943561Skato */ 13043561Skato for (i = 0; devsw[i] != NULL; i++) 13143561Skato if (devsw[i]->dv_init != NULL) 13243561Skato (devsw[i]->dv_init)(); 13355342Snyan printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 13443561Skato 13543561Skato printf("\n"); 13655342Snyan printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 13743561Skato printf("(%s, %s)\n", bootprog_maker, bootprog_date); 13843561Skato 13943561Skato extract_currdev(); /* set $currdev and $loaddev */ 14043561Skato setenv("LINES", "24", 1); /* optional */ 14143561Skato 14243561Skato archsw.arch_autoload = i386_autoload; 14343561Skato archsw.arch_getdev = i386_getdev; 14443561Skato archsw.arch_copyin = i386_copyin; 14543561Skato archsw.arch_copyout = i386_copyout; 14643561Skato archsw.arch_readin = i386_readin; 14743561Skato archsw.arch_isainb = isa_inb; 14843561Skato archsw.arch_isaoutb = isa_outb; 14943561Skato 15043561Skato interact(); /* doesn't return */ 15143561Skato} 15243561Skato 15343561Skato/* 15443561Skato * Set the 'current device' by (if possible) recovering the boot device as 15543561Skato * supplied by the initial bootstrap. 15643561Skato * 15743561Skato * XXX should be extended for netbooting. 15843561Skato */ 15943561Skatostatic void 16043561Skatoextract_currdev(void) 16143561Skato{ 16243561Skato struct i386_devdesc currdev; 16343561Skato int major, biosdev; 16443561Skato 16558871Skato /* Assume we are booting from a BIOS disk by default */ 16658871Skato currdev.d_dev = &biosdisk; 16743561Skato currdev.d_type = currdev.d_dev->dv_type; 16843561Skato 16958871Skato /* new-style boot loaders such as pxeldr and cdldr */ 17058871Skato if (kargs->bootinfo == NULL) { 17158871Skato if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 17258871Skato /* we are booting from a CD with cdldr */ 17358871Skato currdev.d_kind.biosdisk.slice = -1; 17458871Skato currdev.d_kind.biosdisk.partition = 0; 17558871Skato biosdev = initial_bootdev; 17658871Skato } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 17758871Skato /* we are booting from pxeldr */ 17858871Skato currdev.d_dev = &pxedisk; 17958871Skato currdev.d_type = currdev.d_dev->dv_type; 18058871Skato currdev.d_kind.netif.unit = 0; 18158871Skato } else { 18258871Skato /* we don't know what our boot device is */ 18358871Skato currdev.d_kind.biosdisk.slice = -1; 18458871Skato currdev.d_kind.biosdisk.partition = 0; 18558871Skato biosdev = -1; 18658871Skato } 18758871Skato } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 18843561Skato /* The passed-in boot device is bad */ 18943561Skato currdev.d_kind.biosdisk.slice = -1; 19043561Skato currdev.d_kind.biosdisk.partition = 0; 19143561Skato biosdev = -1; 19243561Skato } else { 19358871Skato currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + 19458871Skato B_CONTROLLER(initial_bootdev) - 1; 19543561Skato currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 19643561Skato biosdev = initial_bootinfo->bi_bios_dev; 19743561Skato major = B_TYPE(initial_bootdev); 19843561Skato 19943561Skato /* 20043561Skato * If we are booted by an old bootstrap, we have to guess at the BIOS 20143561Skato * unit number. We will loose if there is more than one disk type 20243561Skato * and we are not booting from the lowest-numbered disk type 20343561Skato * (ie. SCSI when IDE also exists). 20443561Skato */ 20544463Skato#ifdef PC98 20653218Snyan if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 20744463Skato if (B_TYPE(initial_bootdev) == 6) 20844463Skato biosdev = 0x30 + B_UNIT(initial_bootdev); 20944463Skato else 21044463Skato biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 21153218Snyan } 21243561Skato#else 21343561Skato if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 21443561Skato biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */ 21543561Skato#endif 21643561Skato } 21743561Skato 21858871Skato /* 21958871Skato * If we are booting off of a BIOS disk and we didn't succeed in determining 22058871Skato * which one we booted off of, just use disk0: as a reasonable default. 22158871Skato */ 22258871Skato if ((currdev.d_type == devsw[0]->dv_type) && 22358871Skato ((currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) { 22443561Skato printf("Can't work out which disk we are booting from.\n" 22543561Skato "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 22643561Skato currdev.d_kind.biosdisk.unit = 0; 22743561Skato } 22843561Skato env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&currdev), i386_setcurrdev, env_nounset); 22943561Skato env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&currdev), env_noset, env_nounset); 23043561Skato} 23143561Skato 23243561SkatoCOMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 23343561Skato 23443561Skatostatic int 23543561Skatocommand_reboot(int argc, char *argv[]) 23643561Skato{ 23759535Snyan int i; 23843561Skato 23959535Snyan for (i = 0; devsw[i] != NULL; ++i) 24059535Snyan if (devsw[i]->dv_cleanup != NULL) 24159535Snyan (devsw[i]->dv_cleanup)(); 24259535Snyan 24343561Skato printf("Rebooting...\n"); 24443561Skato delay(1000000); 24543561Skato __exit(0); 24643561Skato} 24743561Skato 24843561Skato/* provide this for panic, as it's not in the startup code */ 24943561Skatovoid 25043561Skatoexit(int code) 25143561Skato{ 25243561Skato __exit(code); 25343561Skato} 25443561Skato 25543561SkatoCOMMAND_SET(heap, "heap", "show heap usage", command_heap); 25643561Skato 25743561Skatostatic int 25843561Skatocommand_heap(int argc, char *argv[]) 25943561Skato{ 26043561Skato mallocstats(); 26143561Skato printf("heap base at %p, top at %p\n", end, sbrk(0)); 26243561Skato return(CMD_OK); 26343561Skato} 26443561Skato 26543561Skato/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 26643561Skatostatic int 26743561Skatoisa_inb(int port) 26843561Skato{ 26943561Skato u_char data; 27043561Skato 27143561Skato if (__builtin_constant_p(port) && 27243561Skato (((port) & 0xffff) < 0x100) && 27343561Skato ((port) < 0x10000)) { 27443561Skato __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 27543561Skato } else { 27643561Skato __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 27743561Skato } 27843561Skato return(data); 27943561Skato} 28043561Skato 28143561Skatostatic void 28243561Skatoisa_outb(int port, int value) 28343561Skato{ 28443561Skato u_char al = value; 28543561Skato 28643561Skato if (__builtin_constant_p(port) && 28743561Skato (((port) & 0xffff) < 0x100) && 28843561Skato ((port) < 0x10000)) { 28943561Skato __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 29043561Skato } else { 29143561Skato __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 29243561Skato } 29343561Skato} 29443561Skato 295