3a19b480c8
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.
241 lines
8.1 KiB
C
241 lines
8.1 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: loadfile.c,v 1.10 1998/06/25 06:45:46 ross Exp $ */
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/*-
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* Copyright (c) 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ralph Campbell.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)boot.c 8.1 (Berkeley) 6/10/93
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*/
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#include <stand.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/linker.h>
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#include <machine/elf.h>
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#include <machine/bootinfo.h>
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#include "bootstrap.h"
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#include "libski.h"
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#define _KERNEL
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static int elf_exec(struct preloaded_file *amp);
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int bi_load(struct bootinfo *, struct preloaded_file *);
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struct file_format ia64_elf = { elf_loadfile, elf_exec };
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#define PTE_MA_WB 0
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#define PTE_MA_UC 4
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#define PTE_MA_UCE 5
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#define PTE_MA_WC 6
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#define PTE_MA_NATPAGE 7
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#define PTE_PL_KERN 0
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#define PTE_PL_USER 3
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#define PTE_AR_R 0
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#define PTE_AR_RX 1
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#define PTE_AR_RW 2
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#define PTE_AR_RWX 3
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#define PTE_AR_R_RW 4
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#define PTE_AR_RX_RWX 5
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#define PTE_AR_RWX_RW 6
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#define PTE_AR_X_RX 7
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/*
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* A short-format VHPT entry. Also matches the TLB insertion format.
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*/
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struct ia64_pte {
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u_int64_t pte_p :1; /* bits 0..0 */
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u_int64_t pte_rv1 :1; /* bits 1..1 */
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u_int64_t pte_ma :3; /* bits 2..4 */
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u_int64_t pte_a :1; /* bits 5..5 */
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u_int64_t pte_d :1; /* bits 6..6 */
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u_int64_t pte_pl :2; /* bits 7..8 */
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u_int64_t pte_ar :3; /* bits 9..11 */
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u_int64_t pte_ppn :38; /* bits 12..49 */
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u_int64_t pte_rv2 :2; /* bits 50..51 */
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u_int64_t pte_ed :1; /* bits 52..52 */
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u_int64_t pte_ig :11; /* bits 53..63 */
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};
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void
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enter_kernel(const char* filename, u_int64_t start)
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{
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printf("Entering %s at 0x%lx...\n", filename, start);
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while (*filename == '/')
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filename++;
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ssc(0, (u_int64_t) filename, 0, 0, SSC_LOAD_SYMBOLS);
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__asm __volatile("mov cr.ipsr=%0"
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:: "r"(IA64_PSR_IC
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| IA64_PSR_DT
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| IA64_PSR_RT
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| IA64_PSR_IT
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| IA64_PSR_BN));
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__asm __volatile("mov cr.iip=%0" :: "r"(start));
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__asm __volatile("mov cr.ifs=r0;;");
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__asm __volatile("rfi;;");
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}
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static int
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elf_exec(struct preloaded_file *fp)
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{
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struct file_metadata *md;
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Elf_Ehdr *hdr;
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struct ia64_pte pte;
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struct bootinfo *bi;
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if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
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return(EFTYPE); /* XXX actually EFUCKUP */
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hdr = (Elf_Ehdr *)&(md->md_data);
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/*
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* Ugly hack, similar to linux. Dump the bootinfo into a
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* special page reserved in the link map.
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*/
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bi = (struct bootinfo *) 0x508000;
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bzero(bi, sizeof(struct bootinfo));
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bi_load(bi, fp);
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/*
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* Region 6 is direct mapped UC and region 7 is direct mapped
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* WC. The details of this is controlled by the Alt {I,D}TLB
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* handlers. Here we just make sure that they have the largest
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* possible page size to minimise TLB usage.
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*/
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ia64_set_rr(IA64_RR_BASE(6), (6 << 8) | (28 << 2));
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ia64_set_rr(IA64_RR_BASE(7), (7 << 8) | (28 << 2));
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bzero(&pte, sizeof(pte));
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pte.pte_p = 1;
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pte.pte_ma = PTE_MA_WB;
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pte.pte_a = 1;
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pte.pte_d = 1;
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pte.pte_pl = PTE_PL_KERN;
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pte.pte_ar = PTE_AR_RWX;
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pte.pte_ppn = 0;
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__asm __volatile("mov cr.ifa=%0" :: "r"(IA64_RR_BASE(7)));
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__asm __volatile("mov cr.itir=%0" :: "r"(28 << 2));
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__asm __volatile("srlz.i;;");
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__asm __volatile("itr.i itr[%0]=%1;;"
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:: "r"(0), "r"(*(u_int64_t*)&pte));
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__asm __volatile("itr.d dtr[%0]=%1;;"
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:: "r"(0), "r"(*(u_int64_t*)&pte));
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__asm __volatile("srlz.i;;");
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enter_kernel(fp->f_name, hdr->e_entry);
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#if 0
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static struct bootinfo_v1 bootinfo_v1;
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struct file_metadata *md;
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Elf_Ehdr *hdr;
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int err;
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if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
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return(EFTYPE); /* XXX actually EFUCKUP */
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hdr = (Elf_Ehdr *)&(md->md_data);
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/* XXX ffp_save does not appear to be used in the kernel.. */
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bzero(&bootinfo_v1, sizeof(bootinfo_v1));
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err = bi_load(&bootinfo_v1, &ffp_save, fp);
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if (err)
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return(err);
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/*
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* Fill in the bootinfo for the kernel.
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*/
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strncpy(bootinfo_v1.booted_kernel, fp->f_name,
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sizeof(bootinfo_v1.booted_kernel));
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prom_getenv(PROM_E_BOOTED_OSFLAGS, bootinfo_v1.boot_flags,
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sizeof(bootinfo_v1.boot_flags));
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bootinfo_v1.hwrpb = (void *)HWRPB_ADDR;
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bootinfo_v1.hwrpbsize = ((struct rpb *)HWRPB_ADDR)->rpb_size;
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bootinfo_v1.cngetc = NULL;
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bootinfo_v1.cnputc = NULL;
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bootinfo_v1.cnpollc = NULL;
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printf("Entering %s at 0x%lx...\n", fp->f_name, hdr->e_entry);
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exit(0);
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closeall();
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alpha_pal_imb();
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(*(void (*)())hdr->e_entry)(ffp_save, ptbr_save,
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BOOTINFO_MAGIC, &bootinfo_v1, 1, 0);
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#endif
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}
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