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8c00aba8c4
This is largely the work from the projects/uefi branch, with some additional refinements. This is derived from (and replaces) the original i386 efi implementation; i386 support will be restored later. Specific revisions of note from projects/uefi: r247380: Adjust our load device when we boot from CD under UEFI. The process for booting from a CD under UEFI involves adding a FAT filesystem containing your loader code as an El Torito boot image. When UEFI detects this, it provides a block IO instance that points at the FAT filesystem as a child of the device that represents the CD itself. The problem being that the CD device is flagged as a "raw device" while the boot image is flagged as a "logical partition". The existing EFI partition code only looks for logical partitions and so the CD filesystem was rendered invisible. To fix this, check the type of each block IO device. If it's found to be a CD, and thus an El Torito boot image, look up its parent device and add that instead so that the loader will then load the kernel from the CD filesystem. This is done by using the handle for the boot filesystem as an alias. Something similar to this will be required for booting from other media as well as the loader will live in the EFI system partition, not on the partition containing the kernel. r246231: Add necessary code to hand off from loader to an amd64 kernel. r246335: Grab the EFI memory map and store it as module metadata on the kernel. This is the same approach used to provide the BIOS SMAP to the kernel. r246336: Pass the ACPI table metadata via hints so the kernel ACPI code can find them. r246608: Rework copy routines to ensure we always use memory allocated via EFI. The previous code assumed it could copy wherever it liked. This is not the case. The approach taken by this code is pretty ham-fisted in that it simply allocates a large (32MB) buffer area and stages into that, then copies the whole area into place when it's time to execute. A more elegant solution could be used but this works for now. r247214: Fix a number of problems preventing proper handover to the kernel. There were two issues at play here. Firstly, there was nothing preventing UEFI from placing the loader code above 1GB in RAM. This meant that when we switched in the page tables the kernel expects to be running on, we are suddenly unmapped and things no longer work. We solve this by making our trampoline code not dependent on being at any given position and simply copying it to a "safe" location before calling it. Secondly, UEFI could allocate our stack wherever it wants. As it happened on my PC, that was right where I was copying the kernel to. This did not cause happiness. The solution to this was to also switch to a temporary stack in a safe location before performing the final copy of the loaded kernel. r246231: Add necessary code to hand off from loader to an amd64 kernel. r246335: Grab the EFI memory map and store it as module metadata on the kernel. This is the same approach used to provide the BIOS SMAP to the kernel. r246336: Pass the ACPI table metadata via hints so the kernel ACPI code can find them. r246608: Rework copy routines to ensure we always use memory allocated via EFI. The previous code assumed it could copy wherever it liked. This is not the case. The approach taken by this code is pretty ham-fisted in that it simply allocates a large (32MB) buffer area and stages into that, then copies the whole area into place when it's time to execute. A more elegant solution could be used but this works for now. r247214: Fix a number of problems preventing proper handover to the kernel. There were two issues at play here. Firstly, there was nothing preventing UEFI from placing the loader code above 1GB in RAM. This meant that when we switched in the page tables the kernel expects to be running on, we are suddenly unmapped and things no longer work. We solve this by making our trampoline code not dependent on being at any given position and simply copying it to a "safe" location before calling it. Secondly, UEFI could allocate our stack wherever it wants. As it happened on my PC, that was right where I was copying the kernel to. This did not cause happiness. The solution to this was to also switch to a temporary stack in a safe location before performing the final copy of the loaded kernel. r247216: Use the UEFI Graphics Output Protocol to get the parameters of the framebuffer. Sponsored by: The FreeBSD Foundation
108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*-
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* Copyright (c) 2008-2010 Rui Paulo <rpaulo@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <elf.h>
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#include <efi.h>
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#include <bootstrap.h>
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#ifdef __i386__
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#define ElfW_Rel Elf32_Rel
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#define ElfW_Dyn Elf32_Dyn
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#define ELFW_R_TYPE ELF32_R_TYPE
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#elif __amd64__
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#define ElfW_Rel Elf64_Rel
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#define ElfW_Dyn Elf64_Dyn
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#define ELFW_R_TYPE ELF64_R_TYPE
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#endif
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/*
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* A simple relocator for IA32/AMD64 EFI binaries.
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*/
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EFI_STATUS
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_reloc(unsigned long ImageBase, ElfW_Dyn *dynamic, EFI_HANDLE image_handle,
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EFI_SYSTEM_TABLE *system_table)
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{
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unsigned long relsz, relent;
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unsigned long *newaddr;
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ElfW_Rel *rel;
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ElfW_Dyn *dynp;
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/*
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* Find the relocation address, its size and the relocation entry.
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*/
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relsz = 0;
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relent = 0;
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for (dynp = dynamic; dynp->d_tag != DT_NULL; dynp++) {
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switch (dynp->d_tag) {
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case DT_REL:
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case DT_RELA:
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rel = (ElfW_Rel *) ((unsigned long) dynp->d_un.d_ptr +
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ImageBase);
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break;
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case DT_RELSZ:
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case DT_RELASZ:
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relsz = dynp->d_un.d_val;
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break;
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case DT_RELENT:
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case DT_RELAENT:
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relent = dynp->d_un.d_val;
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break;
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default:
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break;
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}
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}
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/*
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* Perform the actual relocation.
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* XXX: We are reusing code for the amd64 version of this, but
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* we must make sure the relocation types are the same.
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*/
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CTASSERT(R_386_NONE == R_X86_64_NONE);
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CTASSERT(R_386_RELATIVE == R_X86_64_RELATIVE);
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for (; relsz > 0; relsz -= relent) {
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switch (ELFW_R_TYPE(rel->r_info)) {
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case R_386_NONE:
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/* No relocation needs be performed. */
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break;
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case R_386_RELATIVE:
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/* Address relative to the base address. */
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newaddr = (unsigned long *)(ImageBase + rel->r_offset);
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*newaddr += ImageBase;
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break;
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default:
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/* XXX: do we need other relocations ? */
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break;
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}
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rel = (ElfW_Rel *) ((caddr_t) rel + relent);
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}
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return (EFI_SUCCESS);
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}
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