feat: generate bootable iso

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install build-essential llvm lld nasm
+          sudo apt-get install build-essential llvm lld nasm mtools
       - name: Build
         run: |
           make

.gitignore

@@ -1,7 +1,13 @@
 *.o
 *.img
 *.bin
+*.iso
 *~
 
 *.elf
+*.a
 *.dump
+vmstupid
+
+
+/sysroot

Makefile

@@ -5,10 +5,13 @@
 AS		= nasm
 LD		= ld.lld
 OBJDUMP = llvm-objdump
+QEMU	= qemu-system-i386
 RM		= rm -f
+MKCWD	= mkdir -p $(@D)
+INSTALL = install
 
 BIN_DIR		= bin
-DOC_DIR		= doc
+DOC_DIR		= docs
 KERNEL_DIR	= kernel
 LIB_DIR		= lib
 TOOLS_DIR	= tools
@@ -16,22 +19,28 @@ TOOLS_DIR	= tools
 include $(TOOLS_DIR)/build.mk
 
 ASFLAGS	= -DSTUPID_VERSION=\"$(shell $(GIT-VERSION))\" -Ilib
+QEMUFLAGS = -serial stdio
 
-GARBADGE	= stupid.img
+GARBADGE	= stupid.iso
 
 include $(KERNEL_DIR)/build.mk
+include $(LIB_DIR)/build.mk
+include $(BIN_DIR)/build.mk
 
-all: stupid.img
+all: stupid.iso
 
-stupid.img: $(KERNEL_BIN) $(KERNEL_DUMP)
+sysroot: $(KERNEL_BIN) $(KERNEL_DUMP) $(LIBS_BIN)
+	$(INSTALL) -d $@
+	$(INSTALL) -d $@/bin
+	$(INSTALL) -d $@/lib
+	$(INSTALL) $(KERNEL_BIN) $@
+	$(INSTALL) $(LIBS_BIN) $@/lib
 
-#stupid.img: floppy.bin kern.bin
-#	mkdosfs -F 12 -C $@ 1440
-#	dd status=noxfer conv=notrunc if=floppy.bin of=$@
-#	mcopy -i $@ kern.bin ::kern.sys
+stupid.iso: sysroot
+	$(CREATE-ISO) $@ $<
 
-%.dump: %.elf
-	$(OBJDUMP) -D $^ > $@
+run: stupid.iso
+	$(QEMU) $(QEMUFLAGS) -cdrom $<
 
 clean:
 	$(RM) $(GARBADGE)

README.md

@@ -1,4 +1,3 @@
 # StupidOS
 
 32-bit Operating System in assembly.
-

kernel/build.mk

@@ -1,9 +1,9 @@
 include kernel/drivers/build.mk
 
-KERNEL_SRCS	= head.s gdt.s idt.s paging.s lib/log.s
+KERNEL_SRCS	= head.s gdt.s pic.s isr.s idt.s paging.s lib/log.s
 KERNEL_OBJS	= $(addprefix kernel/, $(KERNEL_SRCS:.s=.o) $(DRIVERS_OBJS))
-KERNEL_BIN	= stupid.elf
-KERNEL_DUMP = $(KERNEL_BIN:.elf=.dump)
+KERNEL_BIN	= vmstupid
+KERNEL_DUMP = $(KERNEL_BIN).dump
 
 KERNEL_ASFLAGS	= $(ASFLAGS) -D__KERNEL__
 
@@ -12,8 +12,11 @@ GARBADGE += $(KERNEL_OBJS) $(KERNEL_BIN) $(KERNEL_DUMP)
 $(KERNEL_BIN): $(KERNEL_OBJS)
 	$(LD) -T $(KERNEL_DIR)/linker.ld -nostdlib -o $@ $^
 
+$(KERNEL_DUMP): $(KERNEL_BIN)
+	$(OBJDUMP) -D $^ > $@
+
 kernel/lib/%.o: lib/base/%.s
-	mkdir -p $(@D)
+	@$(MKCWD)
 	$(AS) -felf -o $@ $< $(KERNEL_ASFLAGS)
 
 kernel/%.o: kernel/%.s

kernel/head.s

@@ -29,14 +29,21 @@ entry:
 	extern serial_init
 	call serial_init
 
+	LOG msg_hello_world
+
 	extern setup_gdt
 	call setup_gdt
 
+	extern setup_pic
+	call setup_pic
+
 	extern setup_idt
 	call setup_idt
 
-	extern setup_paging
-	call setup_paging
+	int3
+
+	;extern setup_paging
+	;call setup_paging
 
 	LOG file
 
@@ -44,4 +51,8 @@ hang:
 	hlt
 	jmp hang
 
+
+section .rodata
+
+msg_hello_world db "StupidOS ", STUPID_VERSION, 0
 file db __FILE__, 0

kernel/idt.s

@@ -2,15 +2,33 @@
 section .text
 global setup_idt
 setup_idt:
+%assign i 0
+extern isr %+ i
+	mov eax, isr %+ i
+	mov [idt_entries + i * 4], ax
+	shr eax, 16
+	mov word [idt_entries + i * 4 + 2], 0x8
+	mov byte [idt_entries + i * 4 + 5], 0x8E
+	mov [idt_entries + i * 4 + 6], ax
+
+%assign i i+1
+%rep 32
+%endrep
 	lidt [idt_ptr]
+	sti
 	ret
 
 section .data
 
 idt_ptr:
-	dw idt_entries.end - idt_entries - 1
+	dw 256 * 8
 	dd idt_entries
 
 idt_entries:
 	times 256 dd 0x00000000, 0x00000000
+	;; dw isr_low
+	;; dw kernel cs
+	;; db zero
+	;; db attr
+	;; dw isr_high
 .end:

kernel/isr.s

@@ -0,0 +1,87 @@
+[BITS 32]
+
+%include "base.inc"
+
+%macro ISR_NO_ERR 1
+global isr%1
+isr%1:
+	cli
+	push byte 0
+	push byte %1
+	jmp isr_handler
+%endmacro
+
+%macro ISR_ERR 1
+global isr%1
+isr%1:
+	cli
+	push byte 1
+	push byte %1
+	jmp isr_handler
+%endmacro
+
+section .text
+
+ISR_NO_ERR 0
+ISR_NO_ERR 1
+ISR_NO_ERR 2
+ISR_NO_ERR 3
+ISR_NO_ERR 4
+ISR_NO_ERR 5
+ISR_NO_ERR 6
+ISR_NO_ERR 7
+ISR_ERR 8
+ISR_NO_ERR 9
+ISR_ERR 10
+ISR_ERR 11
+ISR_ERR 12
+ISR_ERR 13
+ISR_ERR 14
+ISR_NO_ERR 15
+ISR_NO_ERR 16
+ISR_NO_ERR 17
+ISR_NO_ERR 18
+ISR_NO_ERR 19
+ISR_NO_ERR 20
+ISR_NO_ERR 21
+ISR_NO_ERR 22
+ISR_NO_ERR 23
+ISR_NO_ERR 24
+ISR_NO_ERR 25
+ISR_NO_ERR 26
+ISR_NO_ERR 27
+ISR_NO_ERR 28
+ISR_NO_ERR 29
+ISR_NO_ERR 30
+ISR_NO_ERR 31
+
+global isr_handler
+isr_handler:
+	pusha
+
+	mov ax, ds
+	push eax
+	mov ax, 0x10
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+
+	LOG msg_interrupt
+
+	pop eax
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+
+	popa
+	add esp, 8
+
+	sti
+	iret
+
+section .rodata
+
+msg_interrupt db "interrupt", 0
+file db __FILE__, 0

kernel/pic.s

@@ -0,0 +1,24 @@
+[BITS 32]
+section .text
+
+global setup_pic
+setup_pic:
+	mov al, 0x11
+	out 0x20, al
+	out 0xA0, al
+	
+	mov al, 0x20
+	out 0x21, al
+	mov al, 0x28
+	out 0xA1, al
+
+	mov al, 4
+	out 0x21, al
+	mov al, 2
+	out 0xA1, al
+
+	; mask all
+	mov al, 0xFF
+	out 0x21, al
+	out 0xA1, al
+	ret

lib/base.inc

@@ -1,10 +1,16 @@
 extern log_impl
 
-%macro LOG 1
+%macro LOG 1-*
+%rep %0
+%rotate -1
 	push %1
+%endrep
 	push file
 
 	call log_impl
 
-	add esp, 8
+	add esp, 4
+%rep %0
+	add esp, 4
+%endrep
 %endmacro

lib/base/build.mk

@@ -0,0 +1,2 @@
+LIBS		+= base
+base_SRCS	= log.s

lib/base/log.s

@@ -56,10 +56,13 @@ log_impl:
 	add esp, 4
 %else
 %endif
+
+.loop:
 	mov eax, [ebp + 12]
 	push eax
 	call putstr
 	add esp, 4
+.end:
 
 %ifdef __KERNEL__
 	mov al, 0xA

lib/build.mk

@@ -0,0 +1,24 @@
+LIBS_BIN	=
+
+define LIBS_TEMPLATE
+
+$(1)_BIN = lib$(1).a
+
+$(1)_OBJS = $$(addprefix lib/$(1)/, $$($(1)_SRCS:.s=.o))
+
+$$($(1)_BIN): $$($(1)_OBJS)
+	ar rcs $$@ $$^
+
+GARBADGE	+= $$($(1)_OBJS) $$($(1)_BIN)
+LIBS_BIN	+= $$($(1)_BIN)
+
+endef
+
+LIBS	=
+
+include lib/*/build.mk
+
+$(foreach lib, $(LIBS), $(eval $(call LIBS_TEMPLATE,$(lib))))
+
+lib/%.o: lib/%.s
+	$(AS) $(ASFLAGS) -o $@ $<

tools/build.mk

@@ -4,6 +4,6 @@ $(1) = $$(addprefix $$(TOOLS_DIR)/, $$(shell echo -n $(1) | tr A-Z a-z))
 
 endef
 
-TOOLS = GIT-VERSION
+TOOLS = GIT-VERSION CREATE-ISO
 
-$(foreach tool, $(TOOLS), $(eval $(call TOOLS_TEMPLATE, $(tool))))
+$(foreach tool, $(TOOLS), $(eval $(call TOOLS_TEMPLATE,$(tool))))

tools/create-iso

@@ -0,0 +1,26 @@
+#!/bin/env sh
+
+grub_config=$(cat <<EOF
+
+set timeout=15
+set default=0
+
+menuentry "StupidOS" {
+   echo "verify system integrity"
+   hashsum --hash sha256 --check /boot/hashfile --prefix /
+   multiboot /vmstupid
+   boot
+}
+
+EOF
+)
+
+gen_iso_file() {
+	mkdir -p "$2/boot/grub"
+	echo "$grub_config" > "$2/boot/grub/grub.cfg"
+	sha256sum "$2"/vmstupid > "$2/boot/hashfile"
+
+	grub-mkrescue -o $1 $2
+}
+
+gen_iso_file "$1" "$2"