Now the Stage 1 of the bootloader loads Stage 2 in memory.

I already wrote this but my computer crashed, so I won't write as much as before.
Now the bootloader is divided in stage1 and stage2, I added and edited some makefiles, stage 2 is written in Asm and C, the kernel isn't loaded into memory.

PS: after this commit I'll add another branch called "coding", the code in that branch won't work 100% because it's missing something, but I don't want to do a "mega commit" every time (those commits will still be in the main branch).
To everyone who wants to try XanvicOS or """using""" it, use the main branch, because the main branch's code is working.
I'll write this in the README.md right after this commit.

.gitignore

@@ -1 +1,2 @@
-build/
+build/
+.mailmap

Makefile

@@ -1,9 +1,12 @@
 ASM=nasm
+CC=gcc
+CC16=/usr/bin/watcom/binl/wcc
+LD16=/usr/bin/watcom/binl/wlink
 
 SRC_DIR=src
 BUILD_DIR=build
 
-.PHONY: all floppy_image kernel bootloader clean always
+.PHONY: all immagine_floppy kernel bootloader clean always
 
 
 #Immagine floppy
@@ -12,8 +15,9 @@ immagine_floppy: $(BUILD_DIR)/main_floppy.img
 
 $(BUILD_DIR)/main_floppy.img: bootloader kernel
 	dd if=/dev/zero of=$(BUILD_DIR)/main_floppy.img bs=512 count=2880
-	mkfs.fat -F 12 -n "XanvOS" $(BUILD_DIR)/main_floppy.img
-	dd if=$(BUILD_DIR)/bootloader.bin of=$(BUILD_DIR)/main_floppy.img conv=notrunc
+	mkfs.fat -F 12 -n "XANVOS" $(BUILD_DIR)/main_floppy.img
+	dd if=$(BUILD_DIR)/stage1.bin of=$(BUILD_DIR)/main_floppy.img conv=notrunc
+	mcopy -i $(BUILD_DIR)/main_floppy.img $(BUILD_DIR)/stage2.bin "::stage2.bin"
 	mcopy -i $(BUILD_DIR)/main_floppy.img $(BUILD_DIR)/kernel.bin "::kernel.bin"
 
 
@@ -22,15 +26,23 @@ $(BUILD_DIR)/main_floppy.img: bootloader kernel
 kernel: $(BUILD_DIR)/kernel.bin
 
 $(BUILD_DIR)/kernel.bin: always
-	$(ASM) $(SRC_DIR)/kernel/kernel.asm -f bin -o $(BUILD_DIR)/kernel.bin
+	$(MAKE) -C $(SRC_DIR)/kernel  BUILD_DIR=$(abspath $(BUILD_DIR))
 
 
 #Bootloader
 
-bootloader: $(BUILD_DIR)/bootloader.bin
+bootloader: stage1 stage2
 
-$(BUILD_DIR)/bootloader.bin: always
-	$(ASM) $(SRC_DIR)/bootloader/boot.asm -f bin -o $(BUILD_DIR)/bootloader.bin
+stage1: $(BUILD_DIR)/stage1.bin
+
+$(BUILD_DIR)/stage1.bin: always
+	$(MAKE) -C $(SRC_DIR)/bootloader/stage1  BUILD_DIR=$(abspath $(BUILD_DIR))
+
+
+stage2: $(BUILD_DIR)/stage2.bin
+
+$(BUILD_DIR)/stage2.bin: always
+	$(MAKE) -C $(SRC_DIR)/bootloader/stage2  BUILD_DIR=$(abspath $(BUILD_DIR))
 
 
 #Always

src/bootloader/stage1/Makefile

@@ -0,0 +1,15 @@
+BUILD_DIR?=build/
+ASM?=nasm
+
+
+.PHONY: all clean
+
+all: stage1
+
+stage1: $(BUILD_DIR)/stage1.bin
+
+$(BUILD_DIR)/stage1.bin:
+	$(ASM) stage1.asm -f bin -o $(BUILD_DIR)/stage1.bin
+
+clean:
+	rm -f $(BUILD_DIR)/stage1.bin

src/bootloader/stage1/stage1.asm

@@ -101,28 +101,28 @@ start:
 	xor bx, bx
 	mov di, buffer
 
-.cerca_kernel:
-	mov si, file_kernel_bin
+.cerca_stage2:
+	mov si, file_stage2_bin
 	mov cx, 11
 	push di
 	repe cmpsb
 	pop di
-	je .kernel_trovato
+	je .stage2_trovato
 
 	add di, 32
 	inc bx
 	cmp bx, [dir_entries_count]
-	jl .cerca_kernel
+	jl .cerca_stage2
 
 	;Kernel non trovato
-	jmp errore_kernel_non_trovato
+	jmp errore_stage2_non_trovato
 
-.kernel_trovato:
-	mov si, msg_kernel_trovato
+.stage2_trovato:
+	mov si, msg_stage2_trovato
 	call puts
 
 	mov ax, [di + 26]
-	mov [kernel_cluster], ax
+	mov [stage2_cluster], ax
 
 	mov ax, [reserved_sectors]
 	mov bx, buffer 
@@ -130,12 +130,12 @@ start:
 	mov dl, [ebr_drive_number]
 	call lettura_disco
 
-	mov bx, KERNEL_LOAD_SEGMENT
+	mov bx, STAGE2_LOAD_SEGMENT
 	mov es, bx
-	mov bx, KERNEL_LOAD_OFFSET
+	mov bx, STAGE2_LOAD_OFFSET
 
-.carica_kernel:
-	mov ax, [kernel_cluster]
+.carica_stage2:
+	mov ax, [stage2_cluster]
 	add ax, 31
 
 	mov cl, 1
@@ -144,7 +144,7 @@ start:
 
 	add bx, [bytes_per_sector]
 
-	mov ax, [kernel_cluster]
+	mov ax, [stage2_cluster]
 	mov cx, 3
 	mul cx
 	mov cx, 2
@@ -168,18 +168,17 @@ start:
 	cmp ax, 0x0FF8
 	jae .fine_lettura
 
-	mov [kernel_cluster], ax
-	jmp .carica_kernel
+	mov [stage2_cluster], ax
+	jmp .carica_stage2
 
 .fine_lettura:
 	mov dl, [ebr_drive_number]
 	
-	mov ax, KERNEL_LOAD_SEGMENT
+	mov ax, STAGE2_LOAD_SEGMENT
 	mov ds, ax
 	mov es, ax
 
-	jmp KERNEL_LOAD_SEGMENT:KERNEL_LOAD_OFFSET
-	jmp premi_per_riavviare
+	jmp STAGE2_LOAD_SEGMENT:STAGE2_LOAD_OFFSET
 
 ;Trasforma/Converte un indirizzo LBA in uno CHS
 
@@ -280,11 +279,11 @@ msg_caricamento:
 msg_errore_lettura:
 	db 'Errore del disco', ENDL, 0
 
-msg_kernel_non_trovato:
-	db 'Kernel non trovato', ENDL, 0
+msg_stage2_non_trovato:
+	db 'Stage 2 non trovato', ENDL, 0
 
-msg_kernel_trovato:
-	db 'Kernel trovato', ENDL, 0
+msg_stage2_trovato:
+	db 'Stage 2 trovato', ENDL, 0
 
 ;Errori
 
@@ -293,17 +292,17 @@ errore_floppy:
 	call puts
 	jmp premi_per_riavviare
 
-errore_kernel_non_trovato:
-	mov si, msg_kernel_non_trovato
+errore_stage2_non_trovato:
+	mov si, msg_stage2_non_trovato
 	call puts
 	jmp premi_per_riavviare
 
 ;Variabili
 
-file_kernel_bin:				db 'KERNEL  BIN'
-kernel_cluster:					dw 0
-KERNEL_LOAD_SEGMENT 			equ 0x2000
-KERNEL_LOAD_OFFSET				equ 0
+file_stage2_bin:				db 'STAGE2  BIN'
+stage2_cluster:					dw 0
+STAGE2_LOAD_SEGMENT 			equ 0x2000
+STAGE2_LOAD_OFFSET				equ 0
 
 ;Cose che non so dove mettere
 

src/bootloader/stage2/Makefile

@@ -0,0 +1,34 @@
+BUILD_DIR?=build/
+ASM?=nasm
+ASMFLAGS?=-f obj
+CC?=gcc
+CC16?=/usr/bin/watcom/binl/wcc
+CFLAGS16?= -4 -d3 -s -wx -ms -zl -zq
+LD16?=/usr/bin/watcom/binl/wlink
+
+SOURCES_C=$(wildcard *.c)
+SOURCES_ASM=$(wildcard *.asm)
+OBJECTS_C=$(patsubst %.c, $(BUILD_DIR)/stage2/c/%.obj, $(SOURCES_C))
+OBJECTS_ASM=$(patsubst %.asm, $(BUILD_DIR)/stage2/asm/%.obj, $(SOURCES_ASM))
+
+.PHONY: all clean always
+
+all: stage2
+
+stage2: $(BUILD_DIR)/stage2.bin
+
+$(BUILD_DIR)/stage2.bin: $(OBJECTS_ASM) $(OBJECTS_C)
+	$(LD16) NAME $(BUILD_DIR)/stage2.bin FILE \{ $(OBJECTS_ASM) $(OBJECTS_C) \} OPTION MAP=$(BUILD_DIR)/stage2.map @linker.lnk
+
+$(BUILD_DIR)/stage2/c/%.obj: %.c always
+	$(CC16) $(CFLAGS16) -fo=$@ $<
+
+$(BUILD_DIR)/stage2/asm/%.obj: %.asm always
+	$(ASM) $(ASMFLAGS) -o $@ $<
+
+always:
+	mkdir -p $(BUILD_DIR)/stage2/c
+	mkdir -p $(BUILD_DIR)/stage2/asm
+
+clean:
+	rm -f $(BUILD_DIR)/stage2.bin

src/bootloader/stage2/linker.lnk

@@ -0,0 +1,12 @@
+FORMAT RAW BIN
+OPTION QUIET,
+    NODEFAULTLIBS,
+    START=entry,
+    VERBOSE,
+    OFFSET=0,
+    STACK=0X200
+ORDER
+    CLNAME CODE
+        SEGMENT _ENTRY
+        SEGMENT _TEXT
+    CLNAME DATA

src/bootloader/stage2/main.c

@@ -0,0 +1,8 @@
+#include "stdint.h"
+#include "stdio.h"
+
+void _cdecl  cstart_(uint16_t bootDrive)
+{
+    puts("Hello World from the Stage 2 of the bootloader written in C!");
+    for (;;);
+}

src/bootloader/stage2/main.err

@@ -0,0 +1,3 @@
+stdio.h(4): Warning! W138: No newline at end of file
+main.c(8): Warning! W138: No newline at end of file
+main.c(4): Warning! W303: Parameter 'bootDrive' has been defined, but not referenced

src/bootloader/stage2/stage2.asm

@@ -0,0 +1,21 @@
+bits 16
+
+section _ENTRY class=CODE
+
+extern _cstart_
+global entry
+
+entry:
+    cli
+    mov ax, ds
+    mov ss, ax
+    mov sp, 0
+    mov bp, sp
+    sti
+
+    xor dh, dh
+    push dx
+    call _cstart_
+
+    cli
+    hlt

src/bootloader/stage2/stdint.h

@@ -0,0 +1,12 @@
+#pragma once
+
+typedef signed char int8_t;
+typedef unsigned char uint8_t;
+typedef signed short int16_t;
+typedef unsigned short uint16_t;
+typedef signed long int int32_t;
+typedef unsigned long int uint32_t;
+typedef signed long int int64_t;
+typedef unsigned long int uint64_t;
+
+

src/bootloader/stage2/stdio.c

@@ -0,0 +1,15 @@
+#include "stdio.h"
+#include "x86.h"
+
+void putc(char c)
+{
+    x86_Video_WriteCharTeletype(c, 0);
+}
+void puts(const char *str)
+{
+    while(*str)
+    {
+        putc(*str);
+        str++;
+    }
+}

src/bootloader/stage2/stdio.err

@@ -0,0 +1,2 @@
+stdio.h(4): Warning! W138: No newline at end of file
+x86.h(4): Warning! W138: No newline at end of file

src/bootloader/stage2/stdio.h

@@ -0,0 +1,4 @@
+#pragma once
+
+void putc(char c);
+void puts(const char *str);

src/bootloader/stage2/x86.asm

@@ -0,0 +1,23 @@
+bits 16
+
+section _TEXT class=CODE
+
+global _x86_Video_WriteCharTeletype
+
+_x86_Video_WriteCharTeletype:
+    push bp
+    mov bp, sp
+
+    push bx
+    mov ah, 0Eh
+    mov al, [bp + 4]
+    mov bh, [bp + 6]
+
+    int 10h
+
+    pop bx
+    
+    mov sp, bp
+    pop bp
+
+    ret

src/bootloader/stage2/x86.h

@@ -0,0 +1,4 @@
+#pragma once
+#include "stdint.h"
+
+void _cdecl x86_Video_WriteCharTeletype(char c, uint8_t page);

src/kernel/Makefile

@@ -0,0 +1,17 @@
+BUILD_DIR?=build/
+ASM?=nasm
+CC?=gcc
+CC16?=/usr/bin/watcom/binl/wcc
+LD16?=/usr/bin/watcom/binl/wlink
+
+.PHONY: all clean
+
+all: kernel
+
+kernel: $(BUILD_DIR)/kernel.bin
+
+$(BUILD_DIR)/kernel.bin:
+	$(ASM) kernel.asm -f bin -o $(BUILD_DIR)/kernel.bin
+
+clean:
+	rm -f $(BUILD_DIR)/kernel.bin