1 /*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #define __ELF_WORD_SIZE 64 31 #include <sys/param.h> 32 #include <sys/exec.h> 33 #include <sys/linker.h> 34 #include <string.h> 35 #include <machine/bootinfo.h> 36 #include <machine/elf.h> 37 #include <stand.h> 38 39 #include "bootstrap.h" 40 #include "libi386.h" 41 #include "btxv86.h" 42 43 static int elf64_exec(struct preloaded_file *amp); 44 static int elf64_obj_exec(struct preloaded_file *amp); 45 46 struct file_format amd64_elf = { elf64_loadfile, elf64_exec }; 47 struct file_format amd64_elf_obj = { elf64_obj_loadfile, elf64_obj_exec }; 48 49 #define PG_V 0x001 50 #define PG_RW 0x002 51 #define PG_U 0x004 52 #define PG_PS 0x080 53 54 typedef uint64_t p4_entry_t; 55 typedef uint64_t p3_entry_t; 56 typedef uint64_t p2_entry_t; 57 extern p4_entry_t PT4[]; 58 extern p3_entry_t PT3[]; 59 extern p2_entry_t PT2[]; 60 61 uint32_t entry_hi; 62 uint32_t entry_lo; 63 64 extern void amd64_tramp(); 65 66 /* 67 * There is an ELF kernel and one or more ELF modules loaded. 68 * We wish to start executing the kernel image, so make such 69 * preparations as are required, and do so. 70 */ 71 static int 72 elf64_exec(struct preloaded_file *fp) 73 { 74 struct file_metadata *md; 75 Elf_Ehdr *ehdr; 76 vm_offset_t modulep, kernend; 77 int err; 78 int i; 79 80 if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL) 81 return(EFTYPE); 82 ehdr = (Elf_Ehdr *)&(md->md_data); 83 84 err = bi_load64(fp->f_args, 0, &modulep, &kernend, 1); 85 if (err != 0) 86 return(err); 87 88 bzero(PT4, PAGE_SIZE); 89 bzero(PT3, PAGE_SIZE); 90 bzero(PT2, PAGE_SIZE); 91 92 /* 93 * This is kinda brutal, but every single 1GB VM memory segment points to 94 * the same first 1GB of physical memory. But it is more than adequate. 95 */ 96 for (i = 0; i < 512; i++) { 97 /* Each slot of the level 4 pages points to the same level 3 page */ 98 PT4[i] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]); 99 PT4[i] |= PG_V | PG_RW | PG_U; 100 101 /* Each slot of the level 3 pages points to the same level 2 page */ 102 PT3[i] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]); 103 PT3[i] |= PG_V | PG_RW | PG_U; 104 105 /* The level 2 page slots are mapped with 2MB pages for 1GB. */ 106 PT2[i] = i * (2 * 1024 * 1024); 107 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U; 108 } 109 110 entry_lo = ehdr->e_entry & 0xffffffff; 111 entry_hi = (ehdr->e_entry >> 32) & 0xffffffff; 112 #ifdef DEBUG 113 printf("Start @ %#llx ...\n", ehdr->e_entry); 114 #endif 115 116 dev_cleanup(); 117 __exec((void *)VTOP(amd64_tramp), modulep, kernend); 118 119 panic("exec returned"); 120 } 121 122 static int 123 elf64_obj_exec(struct preloaded_file *fp) 124 { 125 return (EFTYPE); 126 } 127