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 <vm/vm.h> 32 #include <vm/pmap.h> 33 #include <string.h> 34 #include <machine/bootinfo.h> 35 #include <machine/pmap_pae.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 /* 50 * i386's pmap_pae.h doesn't provide this, so 51 * just typedef our own. 52 */ 53 typedef pdpt_entry_t pml4_entry_t; 54 55 extern pml4_entry_t PT4[]; 56 extern pdpt_entry_t PT3[]; 57 extern pd_entry_t PT2[]; 58 59 uint32_t entry_hi; 60 uint32_t entry_lo; 61 62 extern void amd64_tramp(); 63 64 /* 65 * There is an ELF kernel and one or more ELF modules loaded. 66 * We wish to start executing the kernel image, so make such 67 * preparations as are required, and do so. 68 */ 69 static int 70 elf64_exec(struct preloaded_file *fp) 71 { 72 struct file_metadata *md; 73 Elf_Ehdr *ehdr; 74 vm_offset_t modulep, kernend; 75 int err; 76 int i; 77 78 if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL) 79 return(EFTYPE); 80 ehdr = (Elf_Ehdr *)&(md->md_data); 81 82 err = bi_load64(fp->f_args, &modulep, &kernend, 1); 83 if (err != 0) 84 return(err); 85 86 bzero(PT4, PAGE_SIZE); 87 bzero(PT3, PAGE_SIZE); 88 bzero(PT2, PAGE_SIZE); 89 90 /* 91 * This is kinda brutal, but every single 1GB VM memory segment points to 92 * the same first 1GB of physical memory. But it is more than adequate. 93 */ 94 for (i = 0; i < 512; i++) { 95 /* Each slot of the level 4 pages points to the same level 3 page */ 96 PT4[i] = (pml4_entry_t)VTOP((uintptr_t)&PT3[0]); 97 PT4[i] |= PG_V | PG_RW; 98 99 /* Each slot of the level 3 pages points to the same level 2 page */ 100 PT3[i] = (pdpt_entry_t)VTOP((uintptr_t)&PT2[0]); 101 PT3[i] |= PG_V | PG_RW; 102 103 /* The level 2 page slots are mapped with 2MB pages for 1GB. */ 104 PT2[i] = i * (2 * 1024 * 1024); 105 PT2[i] |= PG_V | PG_RW | PG_PS; 106 } 107 108 entry_lo = ehdr->e_entry & 0xffffffff; 109 entry_hi = (ehdr->e_entry >> 32) & 0xffffffff; 110 #ifdef DEBUG 111 printf("Start @ %#llx ...\n", ehdr->e_entry); 112 #endif 113 114 dev_cleanup(); 115 __exec((void *)VTOP(amd64_tramp), modulep, kernend); 116 117 panic("exec returned"); 118 } 119 120 static int 121 elf64_obj_exec(struct preloaded_file *fp) 122 { 123 return (EFTYPE); 124 } 125