feat: EFI 'hello, world'

.gitignore

@@ -28,3 +28,5 @@ bochsrc.bxrc
 /tmp
 *.tar.gz
 *.sys
+*.obj
+*.efi

boot/Makefile

@@ -1,7 +1,7 @@
 AS = fasm
 RM = rm
 
-TARGET = bootsector.bin stpdboot.sys
+TARGET = bootsector.bin stpdboot.sys bootia32.efi
 
 STAGE0_SRCS	= boot0.asm \
 			const.inc \
@@ -12,6 +12,9 @@ STAGE1_SRCS	= boot1.asm \
 			a20.inc \
 			multiboot.inc
 
+BOOTIA32_EFI_SRCS = bootia32.asm \
+					uefi.inc
+
 .PHONY: all
 all: $(TARGET)
 
@@ -21,6 +24,9 @@ bootsector.bin: $(STAGE0_SRCS)
 stpdboot.sys: $(STAGE1_SRCS)
 	$(AS) boot1.asm $@
 
+bootia32.efi: $(BOOTIA32_EFI_SRCS)
+	$(AS) bootia32.asm $@
+
 .PHONY: clean
 clean:
 	$(RM) $(TARGET)
@@ -29,4 +35,5 @@ clean:
 install: $(TARGET)
 	@ mkdir -p $(DESTDIR)
 	install stpdboot.sys $(DESTDIR)
-
+	@ mkdir -p $(DESTDIR)/EFI/BOOT
+	install bootia32.efi $(DESTDIR)/EFI/BOOT

boot/bootia32.asm

@@ -0,0 +1,42 @@
+	format PE DLL EFI at 10000000h
+	entry efimain
+
+	section '.text' code executable readable
+
+	include 'uefi.inc'
+
+	; ESP     => return address
+	; ESP + 4 => Handle
+	; ESP + 8 => SysTable
+efimain:
+	mov eax, [esp+4]
+	mov [handle], eax
+	mov eax, [esp+8]
+	mov [system_table], eax
+
+	mov ebx, [eax + EFI_SYSTEM_TABLE.ConOut]
+
+	mov eax, 1
+	push eax
+	push ebx
+	call [ebx + EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.Reset]
+	add esp, 8
+
+	push hello_msg
+	push ebx
+	call [ebx + EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.OutputString]
+	add esp, 8
+
+	jmp $
+
+	ret
+
+
+	section '.reloc' fixups data discardable
+
+	section '.data' data readable writeable
+
+hello_msg du 'StupidOS EFI Bootloader', 13, 10, 0
+
+handle       dd ?
+system_table dd ? 

boot/uefi.inc

@@ -0,0 +1,147 @@
+macro defn name
+{
+	virtual at 0
+		name name
+	end virtual
+}
+
+struc BOOLEAN
+{
+	. db ?
+}
+
+struc UINT64
+{
+	align 8
+	. dq ?
+}
+
+struc UINT32
+{
+	align 4
+	. dd ?
+}
+
+struc INT32
+{
+	align 4
+	. dd ?
+}
+
+struc UINTN
+{
+	align 4
+	. dd ?
+}
+
+struc EFI_HANDLE
+{
+	align 4
+	. dd ?
+}
+
+struc UINTPTR
+{
+	align 4
+	. dd ?
+}
+
+struc EFI_TABLE_HEADER
+{
+	.Signature   UINT64
+	.Revision    UINT32
+	.HeaderSize  UINT32
+	.CRC32       UINT32
+	.Reserved    UINT32
+}
+defn EFI_TABLE_HEADER
+
+	;; ========================================================================
+	;; EFI_SYSTEM_TABLE
+	;; ========================================================================
+EFI_SYSTEM_TABLE_SIGNATURE = 0x5453595320494249
+
+EFI_2_90_SYSTEM_TABLE_REVISION = ((2 shl 16) or (90))
+EFI_2_80_SYSTEM_TABLE_REVISION = ((2 shl 16) or (80))
+EFI_2_70_SYSTEM_TABLE_REVISION = ((2 shl 16) or (70))
+EFI_2_60_SYSTEM_TABLE_REVISION = ((2 shl 16) or (60))
+EFI_2_50_SYSTEM_TABLE_REVISION = ((2 shl 16) or (50))
+EFI_2_40_SYSTEM_TABLE_REVISION = ((2 shl 16) or (40))
+EFI_2_31_SYSTEM_TABLE_REVISION = ((2 shl 16) or (31))
+EFI_2_30_SYSTEM_TABLE_REVISION = ((2 shl 16) or (30))
+EFI_2_20_SYSTEM_TABLE_REVISION = ((2 shl 16) or (20))
+EFI_2_10_SYSTEM_TABLE_REVISION = ((2 shl 16) or (10))
+EFI_2_00_SYSTEM_TABLE_REVISION = ((2 shl 16) or (00))
+EFI_1_10_SYSTEM_TABLE_REVISION = ((1 shl 16) or (10))
+EFI_1_02_SYSTEM_TABLE_REVISION = ((1 shl 16) or (02))
+
+EFI_SYSTEM_TABLE_REVISION = EFI_2_90_SYSTEM_TABLE_REVISION
+EFI_SPECIFICATION_VERSION = EFI_SYSTEM_TABLE_REVISION
+
+struc EFI_SYSTEM_TABLE
+{
+	.Hdr                  EFI_TABLE_HEADER
+	.FirmwareVendor       UINTPTR
+	.FirmwareRevision     UINT32
+	.ConsoleInHandle      EFI_HANDLE
+	.ConIn                UINTPTR 
+	.ConsoleOutHandle     EFI_HANDLE
+	.ConOut               UINTPTR
+	.StandardErrorHandle  EFI_HANDLE
+	.StdErr               UINTPTR
+	.RuntimeServices      UINTPTR
+	.BootServices         UINTPTR
+	.NumberOfTableEntries UINTN
+	.ConfigurationTable   UINTPTR
+}
+defn EFI_SYSTEM_TABLE
+
+	;; ========================================================================
+	;; EFI_BOOT_SERVICES
+	;; ========================================================================
+EFI_BOOT_SERVICES_SIGNATURE = 0x56524553544f4f42
+EFI_BOOT_SERVICES_REVISION  = EFI_SPECIFICATION_VERSION
+
+struc EFI_BOOT_SERVICES
+{
+	.Hdr EFI_TABLE_HEADER
+}
+
+	;; ========================================================================
+	;; EFI_RUNTIMES_SERVICES
+	;; ========================================================================
+EFI_RUNTIMES_SERVICES_SIGNATURE = 0x56524553544e5552
+EFI_RUNTIMES_SERVICES_REVISION  = EFI_SPECIFICATION_VERSION
+
+struc EFI_RUNTIMES_SERVICES
+{
+	.Hdr EFI_TABLE_HEADER
+}
+
+	;; ========================================================================
+	;; EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL
+	;; ========================================================================
+struc EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL
+{
+	.Reset             UINTPTR
+	.OutputString      UINTPTR
+	.TestString        UINTPTR
+	.QueryMode         UINTPTR
+	.SetMode           UINTPTR
+	.SetAttribute      UINTPTR
+	.ClearScreen       UINTPTR
+	.SetCursorPosition UINTPTR
+	.EnableCursor      UINTPTR
+	.Mode              UINTPTR
+}
+defn EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL
+
+struc SIMPLE_TEXT_OUTPUT_MODE
+{
+	.MaxMode       INT32
+	.Mode          INT32
+	.Attribute     INT32
+	.CursorColumn  INT32
+	.CursorRow     INT32
+	.CursorVisible BOOLEAN
+}