Fixed constant hex/oct bug + Fixed some of the examples (work in progress) + added bootloader example (I will add some docs)

4 files changed, 161 insertions, 0 deletions

diff --git a/examples/bootloader/Makefile b/examples/bootloader/Makefile
new file mode 100644
index 0000000..5ee3da9
--- /dev/null
+++ b/examples/bootloader/Makefile
@@ -0,0 +1,29 @@
+
+CC = gcc
+ZC = ../../zc
+LD = ld
+OBJCOPY = objcopy
+
+CFLAGS = -m32 -ffreestanding -fno-pie -fno-stack-protector -nostdlib -O2 -Wall
+LDFLAGS = -m elf_i386 -T linker.ld
+
+all: boot.bin
+
+boot.bin: boot.o kernel.o
+	$(LD) $(LDFLAGS) -o boot.elf boot.o kernel.o
+	$(OBJCOPY) -O binary boot.elf boot.bin
+	truncate -s 1024 boot.bin
+	@echo "Bootloader built: boot.bin (Size: $$(stat -c %s boot.bin) bytes)"
+
+boot.o: boot.S
+	$(CC) $(CFLAGS) -c boot.S -o boot.o
+
+kernel.o: kernel.c
+	$(CC) $(CFLAGS) -c kernel.c -o kernel.o
+
+kernel.c: kernel.zc
+	$(ZC) transpile --freestanding kernel.zc
+	mv out.c kernel.c
+
+clean:
+	rm -f *.o *.bin *.elf kernel.c
diff --git a/examples/bootloader/boot.S b/examples/bootloader/boot.S
new file mode 100644
index 0000000..4938689
--- /dev/null
+++ b/examples/bootloader/boot.S
@@ -0,0 +1,84 @@
+
+.code16
+.global start
+.extern kmain
+
+start:
+    cli
+    mov $0, %ax
+    mov %ax, %ds
+    mov %ax, %es
+    mov %ax, %ss
+    mov $0x7c00, %sp
+    
+    # Read sectors from disk
+    mov $0x02, %ah      # BIOS read sector function
+    mov $1, %al         # Number of sectors to read (Load 1 sector/512 bytes)
+    mov $0, %ch         # Cylinder 0
+    mov $0, %dh         # Head 0
+    mov $2, %cl         # Start from sector 2
+    # dl already contains the boot drive number
+    mov $0, %bx         # Segment 0
+    mov %bx, %es
+    mov $0x7e00, %bx    # Destination buffer
+    int $0x13           # BIOS interrupt
+    jc disk_error
+
+    # Load GDT
+    lgdt gdt_descriptor
+
+    # Switch to Protected Mode
+    mov %cr0, %eax
+    or $1, %eax
+    mov %eax, %cr0
+
+    # Jump to 32-bit code segment
+    ljmp $0x08, $protected_mode
+
+disk_error:
+    jmp .
+
+.code32
+protected_mode:
+    # Set up 32-bit data segments
+    mov $0x10, %ax
+    mov %ax, %ds
+    mov %ax, %es
+    mov %ax, %fs
+    mov %ax, %gs
+    mov %ax, %ss
+
+    # Set up stack
+    mov $0x7c00, %esp
+
+    call kmain
+    hlt
+
+gdt_start:
+    .quad 0 # Null descriptor
+
+    # Code Segment (Offset 0x08)
+    .word 0xffff    # Limit (low)
+    .word 0x0       # Base (low)
+    .byte 0x0       # Base (middle)
+    .byte 0x9a      # Access (exec, read)
+    .byte 0xcf      # Granularity
+    .byte 0x0       # Base (high)
+
+    # Data Segment (Offset 0x10)
+    .word 0xffff    # Limit (low)
+    .word 0x0       # Base (low)
+    .byte 0x0       # Base (middle)
+    .byte 0x92      # Access (read/write)
+    .byte 0xcf      # Granularity
+    .byte 0x0       # Base (high)
+
+gdt_end:
+
+gdt_descriptor:
+    .word gdt_end - gdt_start - 1
+    .long gdt_start
+
+.fill 510-(.-start), 1, 0
+.word 0xaa55
+
diff --git a/examples/bootloader/kernel.zc b/examples/bootloader/kernel.zc
new file mode 100644
index 0000000..d39e91c
--- /dev/null
+++ b/examples/bootloader/kernel.zc
@@ -0,0 +1,28 @@
+
+def VGA_BUFFER = 0xb8000;
+def VGA_WIDTH  = 80;
+def VGA_HEIGHT = 25;
+
+@packed
+struct VGAEntry {
+    val: u8;
+    color: u8;
+}
+
+fn kmain() {
+    let vga = (VGAEntry*)VGA_BUFFER;
+    
+    let msg = "Hello from Zen C!";
+    let color = 0x0f; // White on Black
+
+    let i = 0;
+    while msg[i] != 0 {
+        vga[i] = VGAEntry {
+            val: msg[i],
+            color: color
+        };
+        i += 1;
+    }
+
+    loop {} 
+}
diff --git a/examples/bootloader/linker.ld b/examples/bootloader/linker.ld
new file mode 100644
index 0000000..76ae116
--- /dev/null
+++ b/examples/bootloader/linker.ld
@@ -0,0 +1,20 @@
+
+ENTRY(start)
+
+SECTIONS {
+    . = 0x7c00;
+    .text : {
+        *(.text)
+        *(.rodata*)
+    }
+    .data : {
+        *(.data)
+    }
+    .bss : {
+        *(.bss)
+    }
+    /DISCARD/ : {
+        *(.eh_frame)
+        *(.note*)
+    }
+}