48a0b96a50
things over floppy size limits, I can exclude it for release builds or something like that. Most of the changes are to get the load_elf.c file into a seperate elf32_ or elf64_ namespace so that you can have two ELF loaders present at once. Note that for 64 bit kernels, it actually starts up the kernel already in 64 bit mode with paging enabled. This is really easy because we have a known minimum feature set. Of note is that for amd64, we have to pass in the bios int 15 0xe821 memory map because once in long mode, you absolutely cannot make VM86 calls. amd64 does not use 'struct bootinfo' at all. It is a pure loader metadata startup, just like sparc64 and powerpc. Much of the infrastructure to support this was adapted from sparc64.
224 lines
7.7 KiB
C
224 lines
7.7 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 <machine/ia64_cpu.h>
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#include <machine/pte.h>
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#include <machine/vmparam.h>
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#include <efi.h>
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#include <efilib.h>
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#include "bootstrap.h"
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#define _KERNEL
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static int elf64_exec(struct preloaded_file *amp);
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struct file_format ia64_elf = { elf64_loadfile, elf64_exec };
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static __inline u_int64_t
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disable_ic()
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{
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u_int64_t psr;
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__asm __volatile("mov %0=psr;;" : "=r" (psr));
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__asm __volatile("rsm psr.ic|psr.i;; srlz.i;;");
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return psr;
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}
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static __inline void
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restore_ic(u_int64_t psr)
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{
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__asm __volatile("mov psr.l=%0;; srlz.i" :: "r" (psr));
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}
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/*
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* Entered with psr.ic and psr.i both zero.
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*/
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void
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enter_kernel(u_int64_t start, struct bootinfo *bi)
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{
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u_int64_t psr;
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__asm __volatile("srlz.i;;");
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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("mov ar.rsc=0;; flushrs;;");
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__asm __volatile("mov r8=%0" :: "r" (bi));
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__asm __volatile("rfi;;");
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}
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static int
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elf64_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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u_int64_t psr;
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UINTN mapkey, pages, size;
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UINTN descsz;
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UINT32 descver;
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EFI_STATUS status;
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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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* Allocate enough pages to hold the bootinfo block and the memory
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* map EFI will return to us. The memory map has an unknown size,
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* so we have to determine that first. Note that the AllocatePages
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* call can itself modify the memory map, so we have to take that
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* into account as well. The changes to the memory map are caused
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* by splitting a range of free memory into two (AFAICT), so that
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* one is marked as being loader data.
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*/
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size = 0;
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descsz = sizeof(EFI_MEMORY_DESCRIPTOR);
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BS->GetMemoryMap(&size, NULL, &mapkey, &descsz, &descver);
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size += descsz + ((sizeof(struct bootinfo) + 0x0f) & ~0x0f);
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pages = EFI_SIZE_TO_PAGES(size);
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status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData, pages,
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(void*)&bi);
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if (EFI_ERROR(status)) {
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printf("unable to create bootinfo block (status=0x%lx)\n",
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(long)status);
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return (ENOMEM);
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}
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bzero(bi, sizeof(struct bootinfo));
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bi_load(bi, fp, &mapkey, pages);
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printf("Entering %s at 0x%lx...\n", fp->f_name, hdr->e_entry);
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status = BS->ExitBootServices(IH, mapkey);
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if (EFI_ERROR(status)) {
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printf("ExitBootServices returned 0x%lx\n", status);
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return (EINVAL);
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}
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psr = disable_ic();
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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("ptr.i %0,%1" :: "r"(IA64_RR_BASE(7)), "r"(28<<2));
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__asm __volatile("ptr.d %0,%1" :: "r"(IA64_RR_BASE(7)), "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("srlz.i;;");
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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(hdr->e_entry, bi);
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restore_ic(psr);
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}
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