exec.c revision 1.6
1 /* $NetBSD: exec.c,v 1.6 2012/12/27 20:21:51 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 /* 33 * Copyright (c) 1992, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * This code is derived from software contributed to Berkeley by 37 * Ralph Campbell. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 4. Neither the name of the University nor the names of its contributors 48 * may be used to endorse or promote products derived from this software 49 * without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 * 63 * @(#)boot.c 8.1 (Berkeley) 6/10/93 64 */ 65 66 #include <sys/cdefs.h> 67 /* __FBSDID("$FreeBSD: src/sys/boot/efi/libefi/elf_freebsd.c,v 1.13 2004/04/05 23:41:28 imp Exp $"); */ 68 69 #include <lib/libsa/stand.h> 70 #include <lib/libsa/loadfile.h> 71 #include <lib/libkern/libkern.h> 72 73 #include <sys/param.h> 74 #include <sys/lock.h> 75 76 #include <machine/elf_machdep.h> 77 #include <machine/bootinfo.h> 78 #include <machine/ia64_cpu.h> 79 #include <machine/pte.h> 80 #include <machine/vmparam.h> 81 82 #include <efi.h> 83 #include <efilib.h> 84 #include <efiboot.h> 85 86 #include "bootstrap.h" 87 88 #define _KERNEL 89 90 static int elf64_exec(struct preloaded_file *amp); 91 92 struct file_format ia64_elf = { elf64_loadfile, elf64_exec }; 93 94 static __inline u_int64_t 95 disable_ic(void) 96 { 97 u_int64_t psr; 98 __asm __volatile("mov %0=psr;;" : "=r" (psr)); 99 __asm __volatile("rsm psr.ic|psr.i;; srlz.i;;"); 100 return psr; 101 } 102 103 static __inline void 104 restore_ic(u_int64_t psr) 105 { 106 __asm __volatile("mov psr.l=%0;; srlz.i" :: "r" (psr)); 107 } 108 109 /* 110 * Entered with psr.ic and psr.i both zero. 111 */ 112 void 113 enter_kernel(u_int64_t start, struct bootinfo *bi) 114 { 115 u_int64_t psr; 116 117 __asm __volatile("srlz.i;;"); 118 __asm __volatile("mov cr.ipsr=%0" 119 :: "r"(IA64_PSR_IC 120 | IA64_PSR_DT 121 | IA64_PSR_RT 122 | IA64_PSR_IT 123 | IA64_PSR_BN)); 124 __asm __volatile("mov cr.iip=%0" :: "r"(start)); 125 __asm __volatile("mov cr.ifs=r0;;"); 126 __asm __volatile("mov ar.rsc=0;; flushrs;;"); 127 __asm __volatile("mov r8=%0" :: "r" (bi)); 128 __asm __volatile("rfi;;"); 129 } 130 131 static int 132 elf64_exec(struct preloaded_file *fp) 133 { 134 pt_entry_t pte; 135 struct bootinfo *bi; 136 u_int64_t psr; 137 UINTN mapkey, pages, size; 138 UINTN descsz; 139 UINT32 descver; 140 EFI_STATUS status; 141 142 if (strcmp(fp->f_type, ELF64_KERNELTYPE)) return(EFTYPE); 143 144 /* 145 * Allocate enough pages to hold the bootinfo block and the memory 146 * map EFI will return to us. The memory map has an unknown size, 147 * so we have to determine that first. Note that the AllocatePages 148 * call can itself modify the memory map, so we have to take that 149 * into account as well. The changes to the memory map are caused 150 * by splitting a range of free memory into two (AFAICT), so that 151 * one is marked as being loader data. 152 */ 153 size = 0; 154 descsz = sizeof(EFI_MEMORY_DESCRIPTOR); 155 BS->GetMemoryMap(&size, NULL, &mapkey, &descsz, &descver); 156 size += descsz + ((sizeof(struct bootinfo) + 0x0f) & ~0x0f); 157 pages = EFI_SIZE_TO_PAGES(size); 158 status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData, pages, 159 (void*)&bi); 160 if (EFI_ERROR(status)) { 161 printf("unable to create bootinfo block (status=0x%lx)\n", 162 (long)status); 163 return (ENOMEM); 164 } 165 166 memset(bi, 0, sizeof(struct bootinfo)); 167 bi_load(bi, fp, &mapkey, pages); 168 169 printf("Entering %s at 0x%lx...\n", fp->f_name, fp->marks[MARK_ENTRY]); 170 171 status = BS->ExitBootServices(IH, mapkey); 172 if (EFI_ERROR(status)) { 173 printf("ExitBootServices returned 0x%lx\n", status); 174 return (EINVAL); 175 } 176 177 psr = disable_ic(); 178 179 /* 180 * Region 6 is direct mapped UC and region 7 is direct mapped 181 * WC. The details of this is controlled by the Alt {I,D}TLB 182 * handlers. Here we just make sure that they have the largest 183 * possible page size to minimise TLB usage. 184 */ 185 ia64_set_rr(IA64_RR_BASE(6), (6 << 8) | (28 << 2)); 186 ia64_set_rr(IA64_RR_BASE(7), (7 << 8) | (28 << 2)); 187 188 pte = PTE_PRESENT | PTE_MA_WB | PTE_ACCESSED | PTE_DIRTY | 189 PTE_PL_KERN | PTE_AR_RWX; 190 191 __asm __volatile("mov cr.ifa=%0" :: "r"(IA64_RR_BASE(7))); 192 __asm __volatile("mov cr.itir=%0" :: "r"(28 << 2)); 193 __asm __volatile("ptr.i %0,%1" :: "r"(IA64_RR_BASE(7)), "r"(28<<2)); 194 __asm __volatile("ptr.d %0,%1" :: "r"(IA64_RR_BASE(7)), "r"(28<<2)); 195 __asm __volatile("srlz.i;;"); 196 __asm __volatile("itr.i itr[%0]=%1;;" :: "r"(0), "r"(pte)); 197 __asm __volatile("srlz.i;;"); 198 __asm __volatile("itr.d dtr[%0]=%1;;" :: "r"(0), "r"(pte)); 199 __asm __volatile("srlz.i;;"); 200 201 enter_kernel(fp->marks[MARK_ENTRY], bi); 202 203 restore_ic(psr); 204 } 205
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