56e53cb8ef
A foolish consistency is the hobgoblin of little minds, adored by little statesmen and philosophers and divines. With consistency a great soul has simply nothing to do. -- Ralph Waldo Emerson
127 lines
3.8 KiB
C
127 lines
3.8 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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static int elf64_obj_exec(struct preloaded_file *amp);
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struct file_format amd64_elf = { elf64_loadfile, elf64_exec };
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struct file_format amd64_elf_obj = { elf64_obj_loadfile, elf64_obj_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 uint64_t p4_entry_t;
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typedef uint64_t p3_entry_t;
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typedef uint64_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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uint32_t entry_hi;
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uint32_t entry_lo;
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extern void amd64_tramp();
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/*
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* There is an ELF kernel and one or more ELF 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);
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ehdr = (Elf_Ehdr *)&(md->md_data);
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err = bi_load64(fp->f_args, 0, &modulep, &kernend, 1);
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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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/*
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* This is kinda brutal, but every single 1GB VM memory segment points to
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* the same first 1GB of physical memory. But it is more than adequate.
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*/
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for (i = 0; i < 512; i++) {
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/* Each slot of the level 4 pages points to the same level 3 page */
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PT4[i] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]);
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PT4[i] |= PG_V | PG_RW | PG_U;
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/* Each slot of the level 3 pages points to the same level 2 page */
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PT3[i] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
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PT3[i] |= PG_V | PG_RW | PG_U;
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/* The level 2 page slots are mapped with 2MB pages for 1GB. */
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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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static int
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elf64_obj_exec(struct preloaded_file *fp)
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{
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return (EFTYPE);
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}
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