From 1963a0a6d7398a426d0701f90a5bc796e32899ae Mon Sep 17 00:00:00 2001
From: salmonik <salmonik@tuta.io>
Date: Fri, 31 Jul 2026 02:55:10 +0200
Subject: feat(rsboot): initial commit — UEFI bootloader extracted from RNG
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---
 Makefile | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 Makefile

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..bd21c45
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,48 @@
+# =============================================================================
+# Makefile — rsbl (UEFI bootloader for RNG)
+#
+# Produces build/bootloader/BOOTX64.EFI (PE32+ for UEFI)
+#
+# Uses -fPIE for position-independent code so the image works at any
+# load address.  The Optiplex 7010 firmware ignores ImageBase + relocs,
+# so RELOCS_STRIPPED + padding to ~160KB is required.
+# =============================================================================
+
+BUILD_DIR  = ../build/bootloader
+CC         = gcc
+LD         = ld
+OBJCOPY    = objcopy
+
+CFLAGS = -m64 -ffreestanding -nostdinc -nostartfiles -nodefaultlibs   \
+         -fno-builtin -fno-stack-protector -fPIE -fPIC                \
+         -fshort-wchar -mno-red-zone -mabi=ms -Qn                    \
+         -fno-asynchronous-unwind-tables -fno-unwind-tables           \
+         -fno-exceptions                                               \
+         -I. -Wall -Wextra -Werror
+
+LDFLAGS = -m elf_x86_64 -nostdlib -z norelro --no-dynamic-linker      \
+          -Ttext=0x1000 -e efi_main
+
+.PHONY: all clean
+
+all: $(BUILD_DIR)/BOOTX64.EFI
+
+$(BUILD_DIR)/BOOTX64.EFI: main.elf
+	@mkdir -p $(BUILD_DIR)
+	$(OBJCOPY) -O pei-x86-64 --subsystem=10:1.1 \
+	  --heap 0x100000,0x1000 \
+	  --stack 0x100000,0x1000 \
+	  $< $@
+	python3 fix_pe_simple.py $@
+	python3 pad_for_optiplex.py $@
+	@echo "  -> $@"
+	@ls -lh $@
+
+main.elf: main.o
+	$(LD) $(LDFLAGS) -o "$@" "$^"
+
+main.o: main.c uefi.h
+	$(CC) $(CFLAGS) -c -o "$@" "$<"
+
+clean:
+	rm -f *.o *.elf $(BUILD_DIR)/BOOTX64.EFI
-- 
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