From 0cf88f665b00962e9fa93f0d52977c1437d034c9 Mon Sep 17 00:00:00 2001
From: Niklas Halle <niklas@niklashalle.net>
Date: Tue, 28 Apr 2020 11:50:23 +0200
Subject: adapted dir structure to exercise modualities

---
 01_exercise/Makefile     | 28 ++++++++++++++++++++++++++++
 01_exercise/bootloader.c | 23 +++++++++++++++++++++++
 01_exercise/linker.ld    | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 85 insertions(+)
 create mode 100644 01_exercise/Makefile
 create mode 100644 01_exercise/bootloader.c
 create mode 100644 01_exercise/linker.ld

(limited to '01_exercise')

diff --git a/01_exercise/Makefile b/01_exercise/Makefile
new file mode 100644
index 0000000..4bf8198
--- /dev/null
+++ b/01_exercise/Makefile
@@ -0,0 +1,28 @@
+#!/usr/bin/make
+.SUFFIXES:
+SRC = bootloader.c
+TAR = bootloader.bin
+PCK = lab-1.zip
+
+CFLAGS = -m32 -c -Os -march=i686 -ffreestanding -Wall -Werror
+LFLAGS = -m elf_i386 -static -Tlinker.ld -nostdlib --nmagic
+
+%.o: %.c
+	$(CC) $(CFLAGS)  $^ -o $@
+
+%.elf: %.o
+	$(LD) $(LFLAGS) -o $@ $^
+
+%.bin: %.elf
+	objcopy -O binary $^ $@
+
+all: $(TAR)
+
+run: $(TAR)
+	qemu-system-x86_64 -drive format=raw,file=$^
+
+pack:
+	zip $(PCK) Makefile *.c *.h *.s
+
+clean:
+	$(RM) $(RMFILES) $(TAR) $(PCK)
diff --git a/01_exercise/bootloader.c b/01_exercise/bootloader.c
new file mode 100644
index 0000000..a5806e4
--- /dev/null
+++ b/01_exercise/bootloader.c
@@ -0,0 +1,23 @@
+/* needs to stay the first line */
+asm(".code16gcc\njmp $0, $main");
+
+/* space for additional code */
+
+void main(void)
+{
+	asm(
+		"mov $0x007, %%ebx;"
+		"mov $0xE4E, %%eax; int $0x10;"
+		"mov $0xE69, %%eax; int $0x10;"
+		"mov $0xE63, %%eax; int $0x10;"
+		"mov $0xE65, %%eax; int $0x10;"
+		"mov $0xE20, %%eax; int $0x10;"
+		"mov $0xE42, %%eax; int $0x10;"
+		"mov $0xE6F, %%eax; int $0x10;"
+		"mov $0xE6F, %%eax; int $0x10;"
+		"mov $0xE74, %%eax; int $0x10;"
+		"mov $0xE73, %%eax; int $0x10;"
+		"jmp .;"
+		::: "eax", "ebx"
+	);
+}
diff --git a/01_exercise/linker.ld b/01_exercise/linker.ld
new file mode 100644
index 0000000..b02f05e
--- /dev/null
+++ b/01_exercise/linker.ld
@@ -0,0 +1,34 @@
+ENTRY(main);
+SECTIONS
+{
+    . = 0x7C00;
+    .text : AT(0x7C00)
+    {
+        _text = .;
+        *(.text);
+        _text_end = .;
+    }
+    .data :
+    {
+        _data = .;
+        *(.bss);
+        *(.bss*);
+        *(.data);
+        *(.rodata*);
+        *(COMMON)
+        _data_end = .;
+    }
+    .sig : AT(0x7DFE)
+    {
+        SHORT(0xaa55);
+    }
+    /DISCARD/ :
+    {
+        *(.note*);
+        *(.iplt*);
+        *(.igot*);
+        *(.rel*);
+        *(.comment);
+        *(.eh_frame);
+    }
+}
-- 
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