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 #define __ELF_WORD_SIZE 64 28 #include <sys/param.h> 29 #include <sys/exec.h> 30 #include <sys/linker.h> 31 #include <string.h> 32 #include <machine/bootinfo.h> 33 #include <machine/elf.h> 34 #include <stand.h> 35 36 #include "bootstrap.h" 37 #include "libi386.h" 38 #include "btxv86.h" 39 40 static int elf64_exec(struct preloaded_file *amp); 41 static int elf64_obj_exec(struct preloaded_file *amp); 42 43 struct file_format amd64_elf = { elf64_loadfile, elf64_exec }; 44 struct file_format amd64_elf_obj = { elf64_obj_loadfile, elf64_obj_exec }; 45 46 #define PG_V 0x001 47 #define PG_RW 0x002 48 #define PG_PS 0x080 49 50 typedef uint64_t p4_entry_t; 51 typedef uint64_t p3_entry_t; 52 typedef uint64_t p2_entry_t; 53 extern p4_entry_t PT4[]; 54 extern p3_entry_t PT3[]; 55 extern p2_entry_t PT2[]; 56 57 uint32_t entry_hi; 58 uint32_t entry_lo; 59 60 extern void amd64_tramp(); 61 62 /* 63 * There is an ELF kernel and one or more ELF modules loaded. 64 * We wish to start executing the kernel image, so make such 65 * preparations as are required, and do so. 66 */ 67 static int 68 elf64_exec(struct preloaded_file *fp) 69 { 70 struct file_metadata *md; 71 Elf_Ehdr *ehdr; 72 vm_offset_t modulep, kernend; 73 int err; 74 int i; 75 76 if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL) 77 return(EFTYPE); 78 ehdr = (Elf_Ehdr *)&(md->md_data); 79 80 err = bi_load64(fp->f_args, &modulep, &kernend, 1); 81 if (err != 0) 82 return(err); 83 84 bzero(PT4, PAGE_SIZE); 85 bzero(PT3, PAGE_SIZE); 86 bzero(PT2, PAGE_SIZE); 87 88 /* 89 * This is kinda brutal, but every single 1GB VM memory segment points to 90 * the same first 1GB of physical memory. But it is more than adequate. 91 */ 92 for (i = 0; i < 512; i++) { 93 /* Each slot of the level 4 pages points to the same level 3 page */ 94 PT4[i] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]); 95 PT4[i] |= PG_V | PG_RW; 96 97 /* Each slot of the level 3 pages points to the same level 2 page */ 98 PT3[i] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]); 99 PT3[i] |= PG_V | PG_RW; 100 101 /* The level 2 page slots are mapped with 2MB pages for 1GB. */ 102 PT2[i] = i * (2 * 1024 * 1024); 103 PT2[i] |= PG_V | PG_RW | PG_PS; 104 } 105 106 entry_lo = ehdr->e_entry & 0xffffffff; 107 entry_hi = (ehdr->e_entry >> 32) & 0xffffffff; 108 #ifdef DEBUG 109 printf("Start @ %#llx ...\n", ehdr->e_entry); 110 #endif 111 112 dev_cleanup(); 113 __exec((void *)VTOP(amd64_tramp), modulep, kernend); 114 115 panic("exec returned"); 116 } 117 118 static int 119 elf64_obj_exec(struct preloaded_file *fp) 120 { 121 return (EFTYPE); 122 } 123