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.
118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@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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* $FreeBSD$
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*/
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#define __ELF_WORD_SIZE 64
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/linker.h>
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#include <string.h>
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#include <machine/bootinfo.h>
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#include <machine/elf.h>
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#include <stand.h>
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#include "bootstrap.h"
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#include "libi386.h"
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#include "btxv86.h"
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static int elf64_exec(struct preloaded_file *amp);
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struct file_format amd64_elf = { elf64_loadfile, elf64_exec };
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#define PG_V 0x001
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#define PG_RW 0x002
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#define PG_U 0x004
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#define PG_PS 0x080
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typedef u_int64_t p4_entry_t;
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typedef u_int64_t p3_entry_t;
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typedef u_int64_t p2_entry_t;
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extern p4_entry_t PT4[];
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extern p3_entry_t PT3[];
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extern p2_entry_t PT2[];
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u_int32_t entry_hi;
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u_int32_t entry_lo;
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extern amd64_tramp();
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/*
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* There is an a.out kernel and one or more a.out modules loaded.
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* We wish to start executing the kernel image, so make such
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* preparations as are required, and do so.
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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 *ehdr;
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vm_offset_t modulep, kernend;
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int err;
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int i;
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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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ehdr = (Elf_Ehdr *)&(md->md_data);
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err = bi_load64(fp->f_args, &modulep, &kernend);
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if (err != 0)
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return(err);
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bzero(PT4, PAGE_SIZE);
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bzero(PT3, PAGE_SIZE);
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bzero(PT2, PAGE_SIZE);
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/* single PML4 entry */
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PT4[0] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]);
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PT4[0] |= PG_V | PG_RW | PG_U;
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/* Direct map 1GB at address zero */
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PT3[0] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
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PT3[0] |= PG_V | PG_RW | PG_U;
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/* Direct map 1GB at KERNBASE (hardcoded for now) */
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PT3[1] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
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PT3[1] |= PG_V | PG_RW | PG_U;
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/* 512 PG_PS (2MB) page mappings for 1GB of direct mapping */
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for (i = 0; i < 512; i++) {
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PT2[i] = i * (2 * 1024 * 1024);
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PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
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}
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entry_lo = ehdr->e_entry & 0xffffffff;
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entry_hi = (ehdr->e_entry >> 32) & 0xffffffff;
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#ifdef DEBUG
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printf("Start @ %#llx ...\n", ehdr->e_entry);
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#endif
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dev_cleanup();
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__exec((void *)VTOP(amd64_tramp), modulep, kernend);
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panic("exec returned");
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}
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