1/* $NetBSD: exec.c,v 1.4 2009/03/18 10:22:31 cegger 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 72#include <sys/param.h> 73#include <sys/lock.h> 74 75#include <machine/elf_machdep.h> 76#include <machine/bootinfo.h> 77#include <machine/ia64_cpu.h> 78#include <machine/pte.h> 79#include <machine/vmparam.h> 80 81#include <efi.h> 82#include <efilib.h> 83 84#include "bootstrap.h" 85 86#define _KERNEL 87 88static int elf64_exec(struct preloaded_file *amp); 89 90struct file_format ia64_elf = { elf64_loadfile, elf64_exec }; 91 92static __inline u_int64_t 93disable_ic(void) 94{ 95 u_int64_t psr; 96 __asm __volatile("mov %0=psr;;" : "=r" (psr)); 97 __asm __volatile("rsm psr.ic|psr.i;; srlz.i;;"); 98 return psr; 99} 100 101static __inline void 102restore_ic(u_int64_t psr) 103{ 104 __asm __volatile("mov psr.l=%0;; srlz.i" :: "r" (psr)); 105} 106 107/* 108 * Entered with psr.ic and psr.i both zero. 109 */ 110void 111enter_kernel(u_int64_t start, struct bootinfo *bi) 112{ 113 u_int64_t psr; 114 115 __asm __volatile("srlz.i;;"); 116 __asm __volatile("mov cr.ipsr=%0" 117 :: "r"(IA64_PSR_IC 118 | IA64_PSR_DT 119 | IA64_PSR_RT 120 | IA64_PSR_IT 121 | IA64_PSR_BN)); 122 __asm __volatile("mov cr.iip=%0" :: "r"(start)); 123 __asm __volatile("mov cr.ifs=r0;;"); 124 __asm __volatile("mov ar.rsc=0;; flushrs;;"); 125 __asm __volatile("mov r8=%0" :: "r" (bi)); 126 __asm __volatile("rfi;;"); 127} 128 129static int 130elf64_exec(struct preloaded_file *fp) 131{ 132 pt_entry_t pte; 133 struct bootinfo *bi; 134 u_int64_t psr; 135 UINTN mapkey, pages, size; 136 UINTN descsz; 137 UINT32 descver; 138 EFI_STATUS status; 139 140 if (strcmp(fp->f_type, ELF64_KERNELTYPE)) return(EFTYPE); 141 142 /* 143 * Allocate enough pages to hold the bootinfo block and the memory 144 * map EFI will return to us. The memory map has an unknown size, 145 * so we have to determine that first. Note that the AllocatePages 146 * call can itself modify the memory map, so we have to take that 147 * into account as well. The changes to the memory map are caused 148 * by splitting a range of free memory into two (AFAICT), so that 149 * one is marked as being loader data. 150 */ 151 size = 0; 152 descsz = sizeof(EFI_MEMORY_DESCRIPTOR); 153 BS->GetMemoryMap(&size, NULL, &mapkey, &descsz, &descver); 154 size += descsz + ((sizeof(struct bootinfo) + 0x0f) & ~0x0f); 155 pages = EFI_SIZE_TO_PAGES(size); 156 status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData, pages, 157 (void*)&bi); 158 if (EFI_ERROR(status)) { 159 printf("unable to create bootinfo block (status=0x%lx)\n", 160 (long)status); 161 return (ENOMEM); 162 } 163 164 memset(bi, 0, sizeof(struct bootinfo)); 165 bi_load(bi, fp, &mapkey, pages); 166 167 printf("Entering %s at 0x%lx...\n", fp->f_name, fp->marks[MARK_ENTRY]); 168 169 status = BS->ExitBootServices(IH, mapkey); 170 if (EFI_ERROR(status)) { 171 printf("ExitBootServices returned 0x%lx\n", status); 172 return (EINVAL); 173 } 174 175 psr = disable_ic(); 176 177 /* 178 * Region 6 is direct mapped UC and region 7 is direct mapped 179 * WC. The details of this is controlled by the Alt {I,D}TLB 180 * handlers. Here we just make sure that they have the largest 181 * possible page size to minimise TLB usage. 182 */ 183 ia64_set_rr(IA64_RR_BASE(6), (6 << 8) | (28 << 2)); 184 ia64_set_rr(IA64_RR_BASE(7), (7 << 8) | (28 << 2)); 185 186 pte = PTE_PRESENT | PTE_MA_WB | PTE_ACCESSED | PTE_DIRTY | 187 PTE_PL_KERN | PTE_AR_RWX; 188 189 __asm __volatile("mov cr.ifa=%0" :: "r"(IA64_RR_BASE(7))); 190 __asm __volatile("mov cr.itir=%0" :: "r"(28 << 2)); 191 __asm __volatile("ptr.i %0,%1" :: "r"(IA64_RR_BASE(7)), "r"(28<<2)); 192 __asm __volatile("ptr.d %0,%1" :: "r"(IA64_RR_BASE(7)), "r"(28<<2)); 193 __asm __volatile("srlz.i;;"); 194 __asm __volatile("itr.i itr[%0]=%1;;" :: "r"(0), "r"(pte)); 195 __asm __volatile("srlz.i;;"); 196 __asm __volatile("itr.d dtr[%0]=%1;;" :: "r"(0), "r"(pte)); 197 __asm __volatile("srlz.i;;"); 198 199 enter_kernel(fp->marks[MARK_ENTRY], bi); 200 201 restore_ic(psr); 202} 203