afa8862328
a heavily stripped down FreeBSD/i386 (brutally stripped down actually) to attempt to get a stable base to start from. There is a lot missing still. Worth noting: - The kernel runs at 1GB in order to cheat with the pmap code. pmap uses a variation of the PAE code in order to avoid having to worry about 4 levels of page tables yet. - It boots in 64 bit "long mode" with a tiny trampoline embedded in the i386 loader. This simplifies locore.s greatly. - There are still quite a few fragments of i386-specific code that have not been translated yet, and some that I cheated and wrote dumb C versions of (bcopy etc). - It has both int 0x80 for syscalls (but using registers for argument passing, as is native on the amd64 ABI), and the 'syscall' instruction for syscalls. int 0x80 preserves all registers, 'syscall' does not. - I have tried to minimize looking at the NetBSD code, except in a couple of places (eg: to find which register they use to replace the trashed %rcx register in the syscall instruction). As a result, there is not a lot of similarity. I did look at NetBSD a few times while debugging to get some ideas about what I might have done wrong in my first attempt.
161 lines
5.5 KiB
C
161 lines
5.5 KiB
C
/*-
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* Copyright (c) 1998 Doug Rabson
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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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* $FreeBSD$
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*/
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/*
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* Modifications for Intel architecture by Garrett A. Wollman.
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* Copyright 1998 Massachusetts Institute of Technology
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*
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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 both the above copyright notice and this
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* permission notice appear in all copies, that both the above
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* copyright notice and this permission notice appear in all
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* supporting documentation, and that the name of M.I.T. not be used
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* in advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission. M.I.T. makes
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied
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* warranty.
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*
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* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/malloc.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <isa/isavar.h>
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#include <isa/isa_common.h>
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void
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isa_init(device_t dev)
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{
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}
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/*
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* This implementation simply passes the request up to the parent
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* bus, which in our case is the special i386 nexus, substituting any
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* configured values if the caller defaulted. We can get away with
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* this because there is no special mapping for ISA resources on an Intel
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* platform. When porting this code to another architecture, it may be
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* necessary to interpose a mapping layer here.
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*/
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struct resource *
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isa_alloc_resource(device_t bus, device_t child, int type, int *rid,
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u_long start, u_long end, u_long count, u_int flags)
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{
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/*
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* Consider adding a resource definition. We allow rid 0-1 for
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* irq and drq, 0-3 for memory and 0-7 for ports which is
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* sufficient for isapnp.
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*/
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int passthrough = (device_get_parent(child) != bus);
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int isdefault = (start == 0UL && end == ~0UL);
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struct isa_device* idev = DEVTOISA(child);
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struct resource_list *rl = &idev->id_resources;
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struct resource_list_entry *rle;
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if (!passthrough && !isdefault) {
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rle = resource_list_find(rl, type, *rid);
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if (!rle) {
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if (*rid < 0)
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return 0;
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switch (type) {
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case SYS_RES_IRQ:
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if (*rid >= ISA_NIRQ)
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return 0;
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break;
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case SYS_RES_DRQ:
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if (*rid >= ISA_NDRQ)
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return 0;
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break;
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case SYS_RES_MEMORY:
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if (*rid >= ISA_NMEM)
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return 0;
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break;
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case SYS_RES_IOPORT:
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if (*rid >= ISA_NPORT)
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return 0;
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break;
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default:
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return 0;
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}
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resource_list_add(rl, type, *rid, start, end, count);
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}
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}
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return resource_list_alloc(rl, bus, child, type, rid,
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start, end, count, flags);
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}
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int
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isa_release_resource(device_t bus, device_t child, int type, int rid,
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struct resource *r)
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{
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struct isa_device* idev = DEVTOISA(child);
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struct resource_list *rl = &idev->id_resources;
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return resource_list_release(rl, bus, child, type, rid, r);
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}
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/*
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* We can't use the bus_generic_* versions of these methods because those
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* methods always pass the bus param as the requesting device, and we need
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* to pass the child (the i386 nexus knows about this and is prepared to
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* deal).
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*/
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int
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isa_setup_intr(device_t bus, device_t child, struct resource *r, int flags,
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void (*ihand)(void *), void *arg, void **cookiep)
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{
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return (BUS_SETUP_INTR(device_get_parent(bus), child, r, flags,
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ihand, arg, cookiep));
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}
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int
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isa_teardown_intr(device_t bus, device_t child, struct resource *r,
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void *cookie)
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{
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return (BUS_TEARDOWN_INTR(device_get_parent(bus), child, r, cookie));
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}
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