sys/boot/efi/libefi/elf_freebsd.c

   1 /*
   2  * $NetBSD: loadfile.c,v 1.10 1998/06/25 06:45:46 ross Exp $
   3  * $FreeBSD: src/sys/boot/efi/libefi/elf_freebsd.c,v 1.11 2003/05/01 03:56:29 peter Exp $
   4  * $DragonFly: src/sys/boot/efi/libefi/elf_freebsd.c,v 1.1 2003/11/10 06:08:33 dillon Exp $
   5  */
   6
   7 /*-
   8  * Copyright (c) 1997 The NetBSD Foundation, Inc.
   9  * All rights reserved.
  10  *
  11  * This code is derived from software contributed to The NetBSD Foundation
  12  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
  13  * NASA Ames Research Center.
  14  *
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions
  17  * are met:
  18  * 1. Redistributions of source code must retain the above copyright
  19  *    notice, this list of conditions and the following disclaimer.
  20  * 2. Redistributions in binary form must reproduce the above copyright
  21  *    notice, this list of conditions and the following disclaimer in the
  22  *    documentation and/or other materials provided with the distribution.
  23  * 3. All advertising materials mentioning features or use of this software
  24  *    must display the following acknowledgement:
  25  *      This product includes software developed by the NetBSD
  26  *      Foundation, Inc. and its contributors.
  27  * 4. Neither the name of The NetBSD Foundation nor the names of its
  28  *    contributors may be used to endorse or promote products derived
  29  *    from this software without specific prior written permission.
  30  *
  31  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  32  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  33  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  34  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  35  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  36  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  37  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  38  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  39  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  40  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGE.
  42  */
  43
  44 /*
  45  * Copyright (c) 1992, 1993
  46  *      The Regents of the University of California.  All rights reserved.
  47  *
  48  * This code is derived from software contributed to Berkeley by
  49  * Ralph Campbell.
  50  *
  51  * Redistribution and use in source and binary forms, with or without
  52  * modification, are permitted provided that the following conditions
  53  * are met:
  54  * 1. Redistributions of source code must retain the above copyright
  55  *    notice, this list of conditions and the following disclaimer.
  56  * 2. Redistributions in binary form must reproduce the above copyright
  57  *    notice, this list of conditions and the following disclaimer in the
  58  *    documentation and/or other materials provided with the distribution.
  59  * 3. All advertising materials mentioning features or use of this software
  60  *    must display the following acknowledgement:
  61  *      This product includes software developed by the University of
  62  *      California, Berkeley and its contributors.
  63  * 4. Neither the name of the University nor the names of its contributors
  64  *    may be used to endorse or promote products derived from this software
  65  *    without specific prior written permission.
  66  *
  67  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  68  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  69  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  70  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  71  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  72  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  73  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  74  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  75  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  76  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  77  * SUCH DAMAGE.
  78  *
  79  *      @(#)boot.c      8.1 (Berkeley) 6/10/93
  80  */
  81
  82 #include <stand.h>
  83 #include <string.h>
  84
  85 #include <sys/param.h>
  86 #include <sys/linker.h>
  87 #include <machine/elf.h>
  88 #include <machine/bootinfo.h>
  89 #include <machine/ia64_cpu.h>
  90 #include <machine/pte.h>
  91 #include <machine/vmparam.h>
  92
  93 #include <efi.h>
  94 #include <efilib.h>
  95
  96 #include "bootstrap.h"
  97
  98 #define _KERNEL
  99
 100 static int      elf64_exec(struct preloaded_file *amp);
 101
 102 struct file_format ia64_elf = { elf64_loadfile, elf64_exec };
 103
 104 static __inline u_int64_t
 105 disable_ic()
 106 {
 107         u_int64_t psr;
 108         __asm __volatile("mov %0=psr;;" : "=r" (psr));
 109         __asm __volatile("rsm psr.ic|psr.i;; srlz.i;;");
 110         return psr;
 111 }
 112
 113 static __inline void
 114 restore_ic(u_int64_t psr)
 115 {
 116         __asm __volatile("mov psr.l=%0;; srlz.i" :: "r" (psr));
 117 }
 118
 119 /*
 120  * Entered with psr.ic and psr.i both zero.
 121  */
 122 void
 123 enter_kernel(u_int64_t start, struct bootinfo *bi)
 124 {
 125         u_int64_t               psr;
 126
 127         __asm __volatile("srlz.i;;");
 128         __asm __volatile("mov cr.ipsr=%0"
 129                          :: "r"(IA64_PSR_IC
 130                                 | IA64_PSR_DT
 131                                 | IA64_PSR_RT
 132                                 | IA64_PSR_IT
 133                                 | IA64_PSR_BN));
 134         __asm __volatile("mov cr.iip=%0" :: "r"(start));
 135         __asm __volatile("mov cr.ifs=r0;;");
 136         __asm __volatile("mov ar.rsc=0;; flushrs;;");
 137         __asm __volatile("mov r8=%0" :: "r" (bi));
 138         __asm __volatile("rfi;;");
 139 }
 140
 141 static int
 142 elf64_exec(struct preloaded_file *fp)
 143 {
 144         struct file_metadata    *md;
 145         Elf_Ehdr                *hdr;
 146         struct ia64_pte         pte;
 147         struct bootinfo         *bi;
 148         u_int64_t               psr;
 149         UINTN                   mapkey, pages, size;
 150         UINTN                   descsz;
 151         UINT32                  descver;
 152         EFI_STATUS              status;
 153
 154         if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
 155                 return(EFTYPE);                 /* XXX actually EFUCKUP */
 156         hdr = (Elf_Ehdr *)&(md->md_data);
 157
 158         /*
 159          * Allocate enough pages to hold the bootinfo block and the memory
 160          * map EFI will return to us. The memory map has an unknown size,
 161          * so we have to determine that first. Note that the AllocatePages
 162          * call can itself modify the memory map, so we have to take that
 163          * into account as well. The changes to the memory map are caused
 164          * by splitting a range of free memory into two (AFAICT), so that
 165          * one is marked as being loader data.
 166          */
 167         size = 0;
 168         descsz = sizeof(EFI_MEMORY_DESCRIPTOR);
 169         BS->GetMemoryMap(&size, NULL, &mapkey, &descsz, &descver);
 170         size += descsz + ((sizeof(struct bootinfo) + 0x0f) & ~0x0f);
 171         pages = EFI_SIZE_TO_PAGES(size);
 172         status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData, pages,
 173             (void*)&bi);
 174         if (EFI_ERROR(status)) {
 175                 printf("unable to create bootinfo block (status=0x%lx)\n",
 176                     (long)status);
 177                 return (ENOMEM);
 178         }
 179
 180         bzero(bi, sizeof(struct bootinfo));
 181         bi_load(bi, fp, &mapkey, pages);
 182
 183         printf("Entering %s at 0x%lx...\n", fp->f_name, hdr->e_entry);
 184
 185         status = BS->ExitBootServices(IH, mapkey);
 186         if (EFI_ERROR(status)) {
 187                 printf("ExitBootServices returned 0x%lx\n", status);
 188                 return (EINVAL);
 189         }
 190
 191         psr = disable_ic();
 192
 193         /*
 194          * Region 6 is direct mapped UC and region 7 is direct mapped
 195          * WC. The details of this is controlled by the Alt {I,D}TLB
 196          * handlers. Here we just make sure that they have the largest
 197          * possible page size to minimise TLB usage.
 198          */
 199         ia64_set_rr(IA64_RR_BASE(6), (6 << 8) | (28 << 2));
 200         ia64_set_rr(IA64_RR_BASE(7), (7 << 8) | (28 << 2));
 201
 202         bzero(&pte, sizeof(pte));
 203         pte.pte_p = 1;
 204         pte.pte_ma = PTE_MA_WB;
 205         pte.pte_a = 1;
 206         pte.pte_d = 1;
 207         pte.pte_pl = PTE_PL_KERN;
 208         pte.pte_ar = PTE_AR_RWX;
 209         pte.pte_ppn = 0;
 210
 211         __asm __volatile("mov cr.ifa=%0" :: "r"(IA64_RR_BASE(7)));
 212         __asm __volatile("mov cr.itir=%0" :: "r"(28 << 2));
 213         __asm __volatile("ptr.i %0,%1" :: "r"(IA64_RR_BASE(7)), "r"(28<<2));
 214         __asm __volatile("ptr.d %0,%1" :: "r"(IA64_RR_BASE(7)), "r"(28<<2));
 215         __asm __volatile("srlz.i;;");
 216         __asm __volatile("itr.i itr[%0]=%1;;"
 217                          :: "r"(0), "r"(*(u_int64_t*)&pte));
 218         __asm __volatile("srlz.i;;");
 219         __asm __volatile("itr.d dtr[%0]=%1;;"
 220                          :: "r"(0), "r"(*(u_int64_t*)&pte));
 221         __asm __volatile("srlz.i;;");
 222
 223         enter_kernel(hdr->e_entry, bi);
 224
 225         restore_ic(psr);
 226 }