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[efi] Add EFI image format and basic runtime environment
We have EFI APIs for CPU I/O, PCI I/O, timers, console I/O, user access and user memory allocation. EFI executables are created using the vanilla GNU toolchain, with the EXE header handcrafted in assembly and relocations generated by a custom efilink utility.
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Michael Brown
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Oct 13, 2008
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# -*- makefile -*- : Force emacs to use Makefile mode | ||
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# The EFI linker script | ||
# | ||
LDSCRIPT = arch/i386/scripts/efi.lds | ||
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# Use a relocatable link; we perform final relocations in the efilink utility. | ||
# | ||
LDFLAGS += -r -d -S | ||
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# Media types. | ||
# | ||
NON_AUTO_MEDIA += efi | ||
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# Rule for building EFI files | ||
# | ||
$(BIN)/%.efi.tmp-reloc : $(BIN)/%.efi.tmp $(EFILINK) | ||
$(QM)$(ECHO) " [EFILINK] $@" | ||
$(Q)$(LD) -e 0 -o /dev/null $< # Check for unresolved symbols | ||
$(Q)$(EFILINK) $< $@ | ||
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$(BIN)/%.efi : $(BIN)/%.efi.tmp-reloc | ||
$(QM)$(ECHO) " [FINISH] $@" | ||
$(Q)$(OBJCOPY) -Obinary $< $@ |
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*/ | ||
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#include <gpxe/bios_nap.h> | ||
#include <gpxe/efi/efix86_nap.h> | ||
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#endif /* _BITS_MAP_H */ |
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#ifndef _GPXE_EFIX86_NAP_H | ||
#define _GPXE_EFIX86_NAP_H | ||
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/** @file | ||
* | ||
* EFI CPU sleeping | ||
* | ||
*/ | ||
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#ifdef NAP_EFIX86 | ||
#define NAP_PREFIX_efix86 | ||
#else | ||
#define NAP_PREFIX_efix86 __efix86_ | ||
#endif | ||
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#endif /* _GPXE_EFIX86_NAP_H */ |
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/* | ||
* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>. | ||
* | ||
* This program is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU General Public License as | ||
* published by the Free Software Foundation; either version 2 of the | ||
* License, or any later version. | ||
* | ||
* This program is distributed in the hope that it will be useful, but | ||
* WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
* General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* along with this program; if not, write to the Free Software | ||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
*/ | ||
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#include <gpxe/nap.h> | ||
#include <gpxe/efi/efi.h> | ||
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/** @file | ||
* | ||
* gPXE CPU sleeping API for EFI | ||
* | ||
*/ | ||
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/** | ||
* Sleep until next interrupt | ||
* | ||
*/ | ||
static void efix86_cpu_nap ( void ) { | ||
/* | ||
* I can't find any EFI API that allows us to put the CPU to | ||
* sleep. The CpuSleep() function is defined in CpuLib.h, but | ||
* isn't part of any exposed protocol so we have no way to | ||
* call it. | ||
* | ||
* The EFI shell doesn't seem to bother sleeping the CPU; it | ||
* just sits there idly burning power. | ||
* | ||
*/ | ||
__asm__ __volatile__ ( "hlt" ); | ||
} | ||
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PROVIDE_NAP ( efix86, cpu_nap, efix86_cpu_nap ); |
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.text | ||
.code32 | ||
.arch i386 | ||
.section ".prefix", "a", @progbits | ||
.org 0x00 | ||
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/* DOS (.com) header | ||
* | ||
* EFI executables seem to leave most of this empty | ||
*/ | ||
mzhdr: | ||
.ascii "MZ" /* Magic number */ | ||
.word 0 /* Bytes on last page of file */ | ||
.word 0 /* Pages in file */ | ||
.word 0 /* Relocations */ | ||
.word 0 /* Size of header in paragraphs */ | ||
.word 0 /* Minimum extra paragraphs needed */ | ||
.word 0 /* Maximum extra paragraphs needed */ | ||
.word 0 /* Initial (relative) SS value */ | ||
.word 0 /* Initial SP value */ | ||
.word 0 /* "Checksum" */ | ||
.word 0 /* Initial IP value */ | ||
.word 0 /* Initial (relative) CS value */ | ||
.word 0 /* File address of relocation table */ | ||
.word 0 /* Ovesrlay number */ | ||
.word 0, 0, 0, 0 /* Reserved words */ | ||
.word 0 /* OEM identifier (for e_oeminfo) */ | ||
.word 0 /* OEM information; e_oemid specific */ | ||
.word 0, 0, 0, 0, 0 /* Reserved words */ | ||
.word 0, 0, 0, 0, 0 /* Reserved words */ | ||
.long pehdr_lma /* File address of new exe header */ | ||
.size mzhdr, . - mzhdr | ||
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/* PE header */ | ||
.org 0xc0 /* For compatibility with MS toolchain */ | ||
pehdr: | ||
.ascii "PE\0\0" /* Magic number */ | ||
.word 0x014c /* CPU architecture: i386 */ | ||
.word num_pe_sections /* Number of sections */ | ||
.long 0x10d1a884 /* Timestamp */ | ||
.long 0 /* Symbol table */ | ||
.long 0 /* Number of symbols */ | ||
.word opthdr_size /* Size of optional header */ | ||
.word 0x2102 /* Characteristics */ | ||
.size pehdr, . - pehdr | ||
.equ pehdr_lma, pehdr - mzhdr | ||
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/* "Optional" header */ | ||
opthdr: | ||
.word 0x010b /* Magic number */ | ||
.byte 0 /* Linker major version number */ | ||
.byte 0 /* Linker minor version number */ | ||
.long _text_filesz /* Size of text section */ | ||
.long _data_filesz /* Size of data section */ | ||
.long _bss_filesz /* Size of bss section */ | ||
.long efi_entry_lma /* Entry point */ | ||
.long _text_lma /* Text section start RVA */ | ||
.long _data_lma /* Data section start RVA */ | ||
.long 0 /* Image base address */ | ||
.long _max_align /* Section alignment */ | ||
.long _max_align /* File alignment */ | ||
.word 0 /* Operating system major version number */ | ||
.word 0 /* Operating system minor version number */ | ||
.word 0 /* Image major version number */ | ||
.word 0 /* Image minor version number */ | ||
.word 0 /* Subsystem major version number */ | ||
.word 0 /* Subsystem minor version number */ | ||
.long 0 /* Reserved */ | ||
.long _filesz /* Total image size */ | ||
.long _prefix_filesz /* Total header size */ | ||
.long 0 /* "Checksum" */ | ||
.word 0x0a /* Subsystem: EFI */ | ||
.word 0 /* DLL characteristics */ | ||
.long 0 /* Size of stack reserve */ | ||
.long 0 /* Size of stack commit */ | ||
.long 0 /* Size of heap reserve */ | ||
.long 0 /* Size of heap commit */ | ||
.long 0 /* Loader flags */ | ||
.long 16 /* Number of data directory entries */ | ||
.long 0, 0 /* Export directory */ | ||
.long 0, 0 /* Import directory */ | ||
.long 0, 0 /* Resource directory */ | ||
.long 0, 0 /* Exception directory */ | ||
.long 0, 0 /* Security directory */ | ||
.long _reloc_lma, _reloc_filesz /* Base relocation directory */ | ||
.long debugdir_lma, debugdir_size /* Debug directory */ | ||
.long 0, 0 /* Description directory */ | ||
.long 0, 0 /* Special directory */ | ||
.long 0, 0 /* Thread storage directory */ | ||
.long 0, 0 /* Load configuration directory */ | ||
.long 0, 0 /* Bound import directory */ | ||
.long 0, 0 /* Import address table directory */ | ||
.long 0, 0 /* Delay import directory */ | ||
.long 0, 0 /* Reserved */ | ||
.long 0, 0 /* Reserved */ | ||
.size opthdr, . - opthdr | ||
.equ opthdr_size, . - opthdr | ||
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/* PE sections */ | ||
pe_sections: | ||
text_section: | ||
.asciz ".text" /* Section name */ | ||
.align 8 | ||
.long _text_filesz /* Section size */ | ||
.long _text_lma /* Relative Virtual Address */ | ||
.long _text_filesz /* Section size (rounded up) */ | ||
.long _text_lma /* Pointer to raw data */ | ||
.long 0 /* Link-time relocations */ | ||
.long 0 /* Line numbers */ | ||
.word 0 /* Number of link-time relocations */ | ||
.word 0 /* Number of line numbers */ | ||
.long 0x68000020 /* Characteristics */ | ||
rodata_section: | ||
.asciz ".rodata" /* Section name */ | ||
.align 8 | ||
.long _rodata_filesz /* Section size */ | ||
.long _rodata_lma /* Relative Virtual Address */ | ||
.long _rodata_filesz /* Section size (rounded up) */ | ||
.long _rodata_lma /* Pointer to raw data */ | ||
.long 0 /* Link-time relocations */ | ||
.long 0 /* Line numbers */ | ||
.word 0 /* Number of link-time relocations */ | ||
.word 0 /* Number of line numbers */ | ||
.long 0x48000040 /* Characteristics */ | ||
data_section: | ||
.asciz ".data" /* Section name */ | ||
.align 8 | ||
.long _data_filesz /* Section size */ | ||
.long _data_lma /* Relative Virtual Address */ | ||
.long _data_filesz /* Section size (rounded up) */ | ||
.long _data_lma /* Pointer to raw data */ | ||
.long 0 /* Link-time relocations */ | ||
.long 0 /* Line numbers */ | ||
.word 0 /* Number of link-time relocations */ | ||
.word 0 /* Number of line numbers */ | ||
.long 0xc8000040 /* Characteristics */ | ||
reloc_section: | ||
.asciz ".reloc" /* Section name */ | ||
.align 8 | ||
.long _reloc_filesz /* Section size */ | ||
.long _reloc_lma /* Relative Virtual Address */ | ||
.long _reloc_filesz /* Section size (rounded up) */ | ||
.long _reloc_lma /* Pointer to raw data */ | ||
.long 0 /* Link-time relocations */ | ||
.long 0 /* Line numbers */ | ||
.word 0 /* Number of link-time relocations */ | ||
.word 0 /* Number of line numbers */ | ||
.long 0x42000040 /* Characteristics */ | ||
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pe_sections_end: | ||
.size pe_sections, . - pe_sections | ||
.equ num_pe_sections, ( ( . - pe_sections ) / 0x28 ) | ||
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/* Debug directory */ | ||
.section ".rodata" | ||
.globl debugdir | ||
debugdir: | ||
.long 0 /* Characteristics */ | ||
.long 0x10d1a884 /* Timestamp */ | ||
.word 0 /* Major version */ | ||
.word 0 /* Minor version */ | ||
.long 0x02 /* RSDS? */ | ||
.long codeview_rsds_size /* Size of data */ | ||
.long codeview_rsds_lma /* RVA */ | ||
.long codeview_rsds_lma /* File offset */ | ||
.size debugdir, . - debugdir | ||
.equ debugdir_size, . - debugdir | ||
/* Codeview structure */ | ||
.globl codeview_rsds | ||
codeview_rsds: | ||
.ascii "RSDS" /* Magic number */ | ||
.long 0, 0, 0, 0, 0 /* Unused by EFI */ | ||
.asciz "efiprefix.pdb" | ||
.size codeview_rsds, . - codeview_rsds | ||
.equ codeview_rsds_size, . - codeview_rsds |
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