Minimal working example with GNU-efi

8 files changed, 112 insertions, 10 deletions

diff --git a/GNU_efi_HelloWorld/.gitignore b/GNU_efi_HelloWorld/.gitignore
new file mode 100644
index 0000000..ca4663b
--- /dev/null
+++ b/GNU_efi_HelloWorld/.gitignore
@@ -0,0 +1 @@
+gnu-efi
diff --git a/GNU_efi_HelloWorld/Makefile b/GNU_efi_HelloWorld/Makefile
index 4f00d4a..31195ee 100644
--- a/GNU_efi_HelloWorld/Makefile
+++ b/GNU_efi_HelloWorld/Makefile
@@ -1,12 +1,11 @@
 ARCH		= $(shell uname -m | sed s,i[3456789]86,ia32,)
 
-OBJS		= main.o
+OBJS		= hello.o
 TARGET		= hello.efi
 
 EFIINC		= /usr/include/efi
-EFFINCS		= -I$(EFFINC) -I$(EFIINC)/$(ARCH) -I$(EFIINC)/protocol
-LIB		= /usr/lib64
-EFILIB		= /usr/lib64/gnuefi
+EFFINCS		= -I$(EFIINC) -I$(EFIINC)/$(ARCH) -I$(EFIINC)/protocol
+EFILIB		= /usr/lib
 EFI_CRT_OBJS	= $(EFILIB)/crt0-efi-$(ARCH).o
 EFI_LDS		= $(EFILIB)/elf_$(ARCH)_efi.lds
 
@@ -18,7 +17,7 @@ ifeq ($(ARCH),x86_64)
 endif
 
 LDFLAGS		= -nostdlib -znocombreloc -T $(EFI_LDS) -shared \
-			-Bsymbolic -L $(EFILIB) -L $(LIB) $(EFI_CRT_OBJS)
+			-Bsymbolic -L $(EFILIB) $(EFI_CRT_OBJS)
 
 all: $(TARGET)
 
diff --git a/GNU_efi_HelloWorld/hello.c b/GNU_efi_HelloWorld/hello.c
index 26cbd42..52c05b3 100644
--- a/GNU_efi_HelloWorld/hello.c
+++ b/GNU_efi_HelloWorld/hello.c
@@ -4,6 +4,7 @@
 EFI_STATUS
 EFIAPI
 efi_main (EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
+
 	InitializeLib(ImageHandle, SystemTable);
 	Print(L"Hello, world!\n");
 
diff --git a/GNU_efi_HelloWorld/hello.efi b/GNU_efi_HelloWorld/hello.efi
new file mode 100755
index 0000000..27145e5
--- /dev/null
+++ b/GNU_efi_HelloWorld/hello.efi
diff --git a/GNU_efi_HelloWorld/hello.o b/GNU_efi_HelloWorld/hello.o
index 6e14a71..22a8362 100644
--- a/GNU_efi_HelloWorld/hello.o
+++ b/GNU_efi_HelloWorld/hello.o
diff --git a/GNU_efi_HelloWorld/hello.so b/GNU_efi_HelloWorld/hello.so
new file mode 100755
index 0000000..bc418e3
--- /dev/null
+++ b/GNU_efi_HelloWorld/hello.so
diff --git a/documentation/GNU-efi b/documentation/GNU-efi
index 7fb0f1f..8dddc4a 100644
--- a/documentation/GNU-efi
+++ b/documentation/GNU-efi
@@ -1,5 +1,106 @@
-##################################################################
-##								##
-##		BUILDING HELLOWORLD.EFI WIH GNU-EFI		##	
-##								##
-##################################################################
+##################################################################################
+##										##
+##		BUILDING HELLOWORLD.EFI WIH GNU-EFI				##	
+##										##
+##################################################################################
+
+#################################################################################
+#				SUMMARY						#
+#################################################################################
+
+Minimal working example:
+
+	hello.c
+---------------------------------------------------------------------------------
+#include <efi.h>
+#include <efilib.h>
+
+EFI_STATUS
+EFIAPI
+efi_main (EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
+
+    InitializeLib(ImageHandle, SystemTable);
+    Print(L"Hello, world!\n");
+
+    return EFI_SUCCESS;
+}
+
+
+Makefile
+--------------------------------------------------------------------------------
+ARCH        = $(shell uname -m | sed s,i[3456789]86,ia32,)
+
+OBJS        = hello.o
+TARGET        = hello.efi
+
+EFIINC        = /usr/include/efi
+EFFINCS        = -I$(EFIINC) -I$(EFIINC)/$(ARCH) -I$(EFIINC)/protocol
+EFILIB        = /usr/lib
+EFI_CRT_OBJS    = $(EFILIB)/crt0-efi-$(ARCH).o
+EFI_LDS        = $(EFILIB)/elf_$(ARCH)_efi.lds
+
+CFLAGS        = $(EFFINCS) -fno-stack-protector -fpic \
+            -fshort-wchar -mno-red-zone -Wall
+
+ifeq ($(ARCH),x86_64)
+    CFLAGS += -DEFI_FUNCTION_WRAPPER
+endif
+
+LDFLAGS        = -nostdlib -znocombreloc -T $(EFI_LDS) -shared \
+            -Bsymbolic -L $(EFILIB) $(EFI_CRT_OBJS)
+
+all: $(TARGET)
+
+hello.so: $(OBJS)
+    ld $(LDFLAGS) $(OBJS) -o $@ -lefi -lgnuefi
+
+%.efi: %.so
+    objcopy -j .text -j .sdata -j .data -j .dynamic \
+    -j .dynsym -j .rel -j .rela -j .reloc \
+    --target=efi-app-$(ARCH) $^ $@
+
+
+
+
+#################################################################################
+#		https://wiki.osdev.org/GNU-EFI					# 
+#################################################################################
+
+GNU-EFI is a very lightweight developing environment to create UEFI applications.
+It is a set of libraries and headers for compiling UEFI applications with a
+system's native GCC.
+
+You can use host native compiler, then convert resulting ELF into UEFI-compatible
+PE.
+	OR
+Use GCC Cross-Compiler generating PE directly.
+
+*********************************************************************************
+* $ git clone https://git.code.sf.net/p/gnu-efi/code gnu-efi			*
+* $ cd gnu-efi									*
+* $ make									*
+*********************************************************************************
+
+This should create
+* crt0-efi-x86_64.o:
+	A CRT0 (C runtime initialization code) that will call the 
+	"efi_main" function
+
+* libgnuefi.a:
+	A library containing a single function (_relocate)
+	that is used by the CRT0
+
+* (optional) libefi.a:
+	A library containing convenience functions like CRC computation, string
+	length calculation, and easy text printing
+
+HEADERS can be used from:
+* /usr/include/efi   (updated to the latest)
+* from EDK2 package
+* Or from gnu-efi/inc
+
+LINKER SCRIPT:
+* gnu-efi/gnuefi/elf_x86_64_efi.lds
+	OR
+* /usr/lib/elf_x86_64_efi.lds
+
diff --git a/test_code/OVMF_VARS.fd b/test_code/OVMF_VARS.fd
index a7fab53..9883b80 100644
--- a/test_code/OVMF_VARS.fd
+++ b/test_code/OVMF_VARS.fd