49cae21f8a
This loader is quite functional and can load and run kernels. The kernels don't quite work right after loading but that should be easily fixable.
137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* Copyright (c) 1998,2000 Doug Rabson <dfr@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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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <stand.h>
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#include <string.h>
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#include <setjmp.h>
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#include <machine/fpu.h>
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#include "bootstrap.h"
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#include "libski.h"
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extern char bootprog_name[];
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extern char bootprog_rev[];
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extern char bootprog_date[];
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extern char bootprog_maker[];
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struct ski_devdesc currdev; /* our current device */
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struct arch_switch archsw; /* MI/MD interface boundary */
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void
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__start(void)
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{
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static char stack[16384] __attribute__((aligned (16)));
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static char malloc[512*1024];
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int i;
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__asm __volatile("movl gp=__gp;;");
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__asm __volatile("mov sp=%0" :: "r"(&stack[16384]));
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__asm __volatile("bsw.1;;");
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__asm __volatile("mov ar.fpsr=%0" :: "r"(IA64_FPSR_DEFAULT));
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/*
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* initialise the heap as early as possible. Once this is done,
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* alloc() is usable. The stack is buried inside us, so this is
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* safe.
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*/
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setheap((void *)malloc, (void *)(malloc + 512*1024));
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/*
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* XXX Chicken-and-egg problem; we want to have console output
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* early, but some console attributes may depend on reading from
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* eg. the boot device, which we can't do yet. We can use
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* printf() etc. once this is done.
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*/
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cons_probe();
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/*
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* Initialise the block cache
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*/
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bcache_init(32, 512); /* 16k XXX tune this */
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/*
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* March through the device switch probing for things.
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*/
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for (i = 0; devsw[i] != NULL; i++)
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if (devsw[i]->dv_init != NULL)
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(devsw[i]->dv_init)();
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printf("\n");
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printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
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printf("(%s, %s)\n", bootprog_maker, bootprog_date);
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#if 0
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printf("Memory: %ld k\n", memsize() / 1024);
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#endif
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/* XXX presumes that biosdisk is first in devsw */
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currdev.d_dev = devsw[0];
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currdev.d_type = currdev.d_dev->dv_type;
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currdev.d_kind.skidisk.unit = 0;
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/* XXX should be able to detect this, default to autoprobe */
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currdev.d_kind.skidisk.slice = -1;
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/* default to 'a' */
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currdev.d_kind.skidisk.partition = 0;
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#if 0
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/* Create arc-specific variables */
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bootfile = GetEnvironmentVariable(ARCENV_BOOTFILE);
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if (bootfile)
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setenv("bootfile", bootfile, 1);
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#endif
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env_setenv("currdev", EV_VOLATILE, ski_fmtdev(&currdev),
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ski_setcurrdev, env_nounset);
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env_setenv("loaddev", EV_VOLATILE, ski_fmtdev(&currdev), env_noset,
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env_nounset);
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setenv("LINES", "24", 1); /* optional */
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archsw.arch_autoload = ski_autoload;
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archsw.arch_getdev = ski_getdev;
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archsw.arch_copyin = ski_copyin;
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archsw.arch_copyout = ski_copyout;
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archsw.arch_readin = ski_readin;
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interact(); /* doesn't return */
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exit(0);
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}
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COMMAND_SET(quit, "quit", "exit the loader", command_quit);
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static int
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command_quit(int argc, char *argv[])
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{
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exit(0);
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return (CMD_OK);
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}
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