summaryrefslogtreecommitdiffstats
path: root/sys/boot/pc98/loader/main.c
diff options
context:
space:
mode:
Diffstat (limited to 'sys/boot/pc98/loader/main.c')
-rw-r--r--sys/boot/pc98/loader/main.c244
1 files changed, 244 insertions, 0 deletions
diff --git a/sys/boot/pc98/loader/main.c b/sys/boot/pc98/loader/main.c
new file mode 100644
index 0000000..8ee752a
--- /dev/null
+++ b/sys/boot/pc98/loader/main.c
@@ -0,0 +1,244 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id: main.c,v 1.14 1998/11/02 23:28:11 msmith Exp $
+ */
+
+/*
+ * MD bootstrap main() and assorted miscellaneous
+ * commands.
+ */
+
+#include <stand.h>
+#include <string.h>
+#include <machine/bootinfo.h>
+#include <sys/reboot.h>
+
+#include "bootstrap.h"
+#include "../../i386/libi386/libi386.h"
+#include "btxv86.h"
+
+/* Arguments passed in from the boot1/boot2 loader */
+static struct
+{
+ u_int32_t howto;
+ u_int32_t bootdev;
+ u_int32_t res0;
+ u_int32_t res1;
+ u_int32_t res2;
+ u_int32_t bootinfo;
+} *kargs;
+
+static u_int32_t initial_howto;
+static u_int32_t initial_bootdev;
+#ifdef PC98
+struct bootinfo *initial_bootinfo;
+#else
+static struct bootinfo *initial_bootinfo;
+#endif
+
+struct arch_switch archsw; /* MI/MD interface boundary */
+
+static void extract_currdev(void);
+static int isa_inb(int port);
+static void isa_outb(int port, int value);
+
+/* from vers.c */
+extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
+
+/* XXX debugging */
+extern char end[];
+
+void
+main(void)
+{
+ int i;
+
+ /* Pick up arguments */
+ kargs = (void *)__args;
+ initial_howto = kargs->howto;
+ initial_bootdev = kargs->bootdev;
+ initial_bootinfo = (struct bootinfo *)PTOV(kargs->bootinfo);
+
+ /*
+ * Initialise the heap as early as possible. Once this is done, malloc() is usable.
+ *
+ * XXX better to locate end of memory and use that
+ */
+ setheap((void *)end, (void *)(end + (384 * 1024)));
+
+ /*
+ * XXX Chicken-and-egg problem; we want to have console output early, but some
+ * console attributes may depend on reading from eg. the boot device, which we
+ * can't do yet.
+ *
+ * We can use printf() etc. once this is done.
+ * If the previous boot stage has requested a serial console, prefer that.
+ */
+ if (initial_howto & RB_SERIAL)
+ setenv("console", "comconsole", 1);
+ cons_probe();
+
+ /*
+ * Initialise the block cache
+ */
+ bcache_init(32, 512); /* 16k cache XXX tune this */
+
+ /*
+ * March through the device switch probing for things.
+ */
+ for (i = 0; devsw[i] != NULL; i++)
+ if (devsw[i]->dv_init != NULL)
+ (devsw[i]->dv_init)();
+
+ printf("\n");
+ printf("%s, Revision %s %d/%dkB\n", bootprog_name, bootprog_rev, getbasemem(), getextmem());
+ printf("(%s, %s)\n", bootprog_maker, bootprog_date);
+
+ extract_currdev(); /* set $currdev and $loaddev */
+ setenv("LINES", "24", 1); /* optional */
+
+ archsw.arch_autoload = i386_autoload;
+ archsw.arch_getdev = i386_getdev;
+ archsw.arch_copyin = i386_copyin;
+ archsw.arch_copyout = i386_copyout;
+ archsw.arch_readin = i386_readin;
+ archsw.arch_isainb = isa_inb;
+ archsw.arch_isaoutb = isa_outb;
+
+ interact(); /* doesn't return */
+}
+
+/*
+ * Set the 'current device' by (if possible) recovering the boot device as
+ * supplied by the initial bootstrap.
+ *
+ * XXX should be extended for netbooting.
+ */
+static void
+extract_currdev(void)
+{
+ struct i386_devdesc currdev;
+ int major, biosdev;
+
+ /* We're booting from a BIOS disk, try to spiff this */
+ currdev.d_dev = devsw[0]; /* XXX presumes that biosdisk is first in devsw */
+ currdev.d_type = currdev.d_dev->dv_type;
+
+ if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
+ /* The passed-in boot device is bad */
+ currdev.d_kind.biosdisk.slice = -1;
+ currdev.d_kind.biosdisk.partition = 0;
+ biosdev = -1;
+ } else {
+ currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + B_CONTROLLER(initial_bootdev) - 1;
+ currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
+ biosdev = initial_bootinfo->bi_bios_dev;
+ major = B_TYPE(initial_bootdev);
+
+ /*
+ * If we are booted by an old bootstrap, we have to guess at the BIOS
+ * unit number. We will loose if there is more than one disk type
+ * and we are not booting from the lowest-numbered disk type
+ * (ie. SCSI when IDE also exists).
+ */
+#ifdef PC98
+ if (major == 6)
+ biosdev = 0x30 + B_UNIT(initial_bootdev);
+ else
+ biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev);
+#else
+ if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
+ biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
+#endif
+ }
+
+ if ((currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1) {
+ printf("Can't work out which disk we are booting from.\n"
+ "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
+ currdev.d_kind.biosdisk.unit = 0;
+ }
+ env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&currdev), i386_setcurrdev, env_nounset);
+ env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&currdev), env_noset, env_nounset);
+}
+
+COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
+
+static int
+command_reboot(int argc, char *argv[])
+{
+
+ printf("Rebooting...\n");
+ delay(1000000);
+ __exit(0);
+}
+
+/* provide this for panic, as it's not in the startup code */
+void
+exit(int code)
+{
+ __exit(code);
+}
+
+COMMAND_SET(heap, "heap", "show heap usage", command_heap);
+
+static int
+command_heap(int argc, char *argv[])
+{
+ mallocstats();
+ printf("heap base at %p, top at %p\n", end, sbrk(0));
+ return(CMD_OK);
+}
+
+/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
+static int
+isa_inb(int port)
+{
+ u_char data;
+
+ if (__builtin_constant_p(port) &&
+ (((port) & 0xffff) < 0x100) &&
+ ((port) < 0x10000)) {
+ __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
+ } else {
+ __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
+ }
+ return(data);
+}
+
+static void
+isa_outb(int port, int value)
+{
+ u_char al = value;
+
+ if (__builtin_constant_p(port) &&
+ (((port) & 0xffff) < 0x100) &&
+ ((port) < 0x10000)) {
+ __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
+ } else {
+ __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
+ }
+}
+
OpenPOWER on IntegriCloud