[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.

1 files changed, 175 insertions, 0 deletions

diff --git a/src/arch/i386/prefix/efiprefix.S b/src/arch/i386/prefix/efiprefix.S
new file mode 100644
index 00000000..c4cf68e4
--- /dev/null
+++ b/src/arch/i386/prefix/efiprefix.S
@@ -0,0 +1,175 @@
+	.text
+	.code32
+	.arch i386
+	.section ".prefix", "a", @progbits
+	.org 0x00
+
+	/* 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
+
+	/* 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
+
+	/* "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
+
+	/* 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 */
+
+pe_sections_end:
+	.size	pe_sections, . - pe_sections
+	.equ	num_pe_sections, ( ( . - pe_sections ) / 0x28 )
+
+	/* 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