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Reverted to x86, refactored Makefile sysstem.

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This commit is contained in:
Marco Cetica 2021-02-04 15:27:55 +01:00
parent 634393b141
commit 8b96940519
15 changed files with 123 additions and 251 deletions
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1
.gitignore vendored
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@ -3,6 +3,7 @@
# Object files
*.o
*.o_asm
*.ko
*.obj
*.elf

70
Makefile
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@ -1,48 +1,74 @@
LD = x86_64-elf-ld
LD = i686-elf-ld
LFLAGS = -melf_i386 -nostdlib -O2 -T link.ld
all: prepare cpu kernel_code drivers libc userspace mem link iso
prepare:
mkdir -p obj/
mkdir -p isodir/boot/grub/
cp grub.cfg isodir/boot/grub/grub.cfg
@mkdir -p obj/
@mkdir -p isodir/boot/grub/
@echo [MKDIR] obj/
@echo [MKDIR] isodir/boot/grub
@cp grub.cfg isodir/boot/grub/grub.cfg
@echo [CP] grub.cfg isodir/boot/grub.cfg
cpu:
make -C kernel/cpu
cp kernel/cpu/*.o obj/
@echo [DIR] kernel/cpu
@make -sC kernel/cpu
@cp kernel/cpu/*.o_asm obj/
@echo [CP] kernel/cpu/*.o obj/
kernel_code:
make -C kernel
cp kernel/*.o obj/
@echo [DIR] kernel/
@make -sC kernel
@cp kernel/*.o obj/
@echo [CP] kernel/*.o obj/
drivers:
make -C kernel/drivers/
cp kernel/drivers/*.o obj/
@echo [DIR] kernel/drivers/
@make -sC kernel/drivers
@cp kernel/drivers/*.o obj/
@echo [CP] kernel/drivers/*.o obj/
libc:
make -C kernel/libc
cp kernel/libc/*.o obj/
@echo [DIR] kernel/libc/
@make -sC kernel/libc
@cp kernel/libc/*.o obj/
@echo [CP] kernel/libc/*.o obj/
userspace:
make -C kernel/userspace
cp kernel/userspace/*.o obj/
@echo [DIR] kernel/userspace/
@make -sC kernel/userspace
@cp kernel/userspace/*.o obj/
@echo [CP] kernel/userspace/*.o obj/
mem:
make -C kernel/mem
cp kernel/mem/*.o obj/
@echo [DIR] kernel/mem
@make -sC kernel/mem
@cp kernel/mem/*.o obj/
@echo [CP] kernel/mem/*.o obj/
link:
$(LD) $(LFLAGS) -o isodir/boot/vulcanos.bin obj/*.o
@$(LD) $(LFLAGS) -o isodir/boot/vulcanos.bin obj/*.o obj/*.o_asm
@echo [LD] Linking blob...
iso:
grub-mkrescue isodir -o vulcanos.iso
@echo [ISO] Creating ISO file...
@grub-mkrescue isodir -o vulcanos.iso > /dev/null 2>&1
clean:
rm -rf obj/ kernel/*.o kernel/cpu/*.o
rm -rf kernel/userspace/*.o kernel/mem/*.o
rm -rf kernel/drivers/*.o kernel/libc/*.o
rm -rf vulcanos.iso bochslog.txt commands isodir
@rm -rf obj/ kernel/*.o kernel/cpu/*.o_asm
@echo [RM] obj
@echo [RM] kernel/*.o
@echo [RM] kernel/cpu/*.o_asm
@rm -rf kernel/userspace/*.o kernel/mem/*.o
@echo [RM] kernel/userspace/*.o
@echo [RM] kernel/mem/*.o
@rm -rf kernel/drivers/*.o kernel/libc/*.o
@echo [RM] kernel/drivers/*.o
@echo [RM] kernel/libc/*.o
@rm -rf vulcanos.iso bochslog.txt commands isodir
@echo [RM] vulcanos.iso
@echo [RM] isodir
bochs:
bochs -f bochs_cfg -q

2
README.md
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@ -19,7 +19,7 @@ After that, you can build VulcanOS just by running the commands below:
2. Type `make run` to start it in QEMU or `make bochs` to start it with bochs.
You can also find an ISO file
[here](https://github.com/ice-bit/vulcanos/raw/master/imgs/vulcanos.iso)(md5sum: `a706cdfeea573e08550e599717d3f519`)
[here](https://github.com/ice-bit/vulcanos/raw/master/imgs/vulcanos.iso)(md5sum: `11375e1e169069b85c14d3cb6c5a4f06`)
## Features
Right now, VulcanOS supports the following features:

BIN
imgs/vulcanos.iso
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Binary file not shown.

5
kernel/Makefile
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@ -1,10 +1,11 @@
OBJS = kernel_main.o
CC = x86_64-elf-gcc # cross-compiler
CC = i686-elf-gcc # cross-compiler
CFLAGS = -m32 -fno-stack-protector -ffreestanding -Wall -Wextra -Werror -g -c
all: ${OBJS}
%.o: %.c
$(CC) $(CFLAGS) $< -o $@
@$(CC) $(CFLAGS) $< -o $@
@echo [CC] Compiling $<...

15
kernel/cpu/Makefile
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@ -1,9 +1,12 @@
OBJS = main.asm.o main64.asm.o ports.asm.o \
gdt.asm.o idt.asm.o \
interrupts.asm.o header.asm.o
SOURCES = main.asm ports.asm \
gdt.asm idt.asm \
interrupts.asm header.asm
OBJS = $(SOURCES:.asm=.o_asm)
ASM = nasm
ASMFLAGS = -f elf32
all: $(OBJS)
%.asm.o: %.asm
$(ASM) $(ASMFLAGS) $< -o $@
%.o_asm: %.asm
@$(ASM) $(ASMFLAGS) $< -o $@
@echo [ASM] compiling $<...

160
kernel/cpu/main.asm
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@ -5,169 +5,23 @@
; Released under GPLv3 ;
; https://github.com/ice-bit/vulcanos ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
EXTERN long_mode_start
GLOBAL kernel_loader
EXTERN kernel_main
[BITS 32] ; Ensure we are in protected mode
section .text
kernel_loader:
mov esp, kernel_stack + KERNEL_STACK_SZ ; Define stack pointer
; Now we need to switch to Long Mode(i.e., 64bit mode)
; to do that, we first need to check if we actually are
; being loaded by a multiboot compliant bootloader. Then,
; we will execute CPUID instruction in order to obtain details
; about out CPU(i.e., if the CPU supports long mode).
call check_multiboot
call check_cpuid
call check_long_mode
; After that, we need to setup paging
call setup_page_tables
call enable_paging
; We also need to load a GDT
lgdt[gdt64.pointer]
jmp gdt64.code_segment:long_mode_start
push eax ; Set multiboot header register
check_multiboot:
; To prove that we are being loaded by a multiboot
; bootloader, we can read the EAX register to see if
; it contains the magic number
cmp eax, 0xE85250D6
jne .multiboot_panic
ret
.multiboot_panic:
; We handle this error by showing a special code
mov al, "M"
jmp error ; Call print routine
check_cpuid:
; To check if CPUID is available we need to flip
; ID bit of the flag register, if this is possibile
; then CPUID instruction is available. In order to achieve
pushfd ; Push flag register into the stack
pop eax ; Pop the stack
mov ecx, eax ; Make a copy of the stack
xor eax, 1 << 21 ; Flip ID bit(21th) from the eax register
push eax
popfd ; Restore flag register into the stack
pushfd
pop eax
push ecx
popfd
cmp eax, ecx ; If values are the same, then CPUID is not available
je .cpuid_panic
ret ; Otherwise return
.cpuid_panic:
mov al, "C"
jmp error ; Call print routine
check_long_mode:
; Check if CPU supports extended processor info
mov eax, 0x80000000 ; Store magic number
cpuid ; CPUID instruction takes EAX by default
; CPUID will set EAX a value greater than the magic number
; if the processor supports extended processor info
cmp eax, 0x80000001 ; Magic number + 1
jb .long_mode_panic
; Otherwise we can use extended processor info
; to check if long mode is available
mov eax, 0x80000001
cpuid
; CPUID, with this magic number, will set LM bit(29th)
; if and only if long mode is available
test edx, 1 << 29
jz .long_mode_panic
ret
.long_mode_panic:
mov al, "L"
jmp error ; Call print routine
setup_page_tables:
mov eax, page_table_l3
or eax, 0b11
mov [page_table_l4], eax
mov eax, page_table_l2
or eax, 0b11
mov [page_table_l3], eax
call kernel_main ; Call kernel's main function
.loop:
mov eax, 0x200000 ; 2MiB
mul ecx
or eax, 0b10000011
mov [page_table_l2 + ecx * 8], eax
mov ecx, 0 ; Counter
inc ecx ; Increment counter
cmp ecx, 512 ; Check if whole table is being mapped
jne .loop ; if not, repeat
ret
enable_paging:
; Pass page table location to the cpu
mov eax, page_table_l4
mov cr3, eax
; Enable PAE
mov eax, cr4
or eax, 1 << 5
mov cr4, eax;
; Enable long mode
mov ecx, 0xC0000000
rdmsr
or eax, 1 << 8
wrmsr
; Enable paging
mov eax, cr0
or eax, 1 << 31
mov cr0, eax
ret
error: ; Prints "ERR: X" where X stands ofr the given error code
; This routine will just print the error code in video memory
; Let's understand what those hex codes actually mean:
; 0xB8000 is the begin of the VGA text buffer, each byte will
; contain one character. 0x4F is the color code; it means
; white text on read background. 0x52 is the ASCII code for
; the letter 'R', while 0x45 stands for the letter 'E',
; 0x3A stands for the symbol ':' and 0x20 is just a space.
; Do note that addressing is in little endian ordering and
; that one space is begin overwritten by the ASCII byte.
; previous NEW CONTENT
mov dword [0xB8000], 0x4F524F45 ; [] ER
mov dword [0xB8004], 0x4F3A4F52 ; [ER] R:
mov dword [0xB8008], 0x4F204F20 ; [ERR:] <space>
mov byte [0xB800a], al ; Print the error code
hlt ; Halt the CPU
jmp .loop ; If the kernel returns, go into an endless loop
; This will prevent the CPU to execure any non-kernel
; instructions.
KERNEL_STACK_SZ equ 4096 ; Stack size(4KiB)
section .bss
align 4096
page_table_l4:
resb 4096
page_table_l3:
resb 4096
page_table_l2:
resb 4096
align 4
kernel_stack:
resb KERNEL_STACK_SZ ; Reserver 4KiB for kernel's stack
section .rodata
gdt64:
dq 0 ; zero entry
.code_segment: equ $ - gdt64
dq (1 << 4) | (1 << 44) | (1 << 47) | (1 << 53) ; Code segment
; executable, descriptor, present 64bit flags
.pointer:
dw $ - gdt64 - 1
dd gdt64

27
kernel/cpu/main64.asm
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@ -1,27 +0,0 @@
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; vulcanOS Kernel ;
; Developed by Marco 'icebit' Cetica ;
; (c) 2019-2021 ;
; Released under GPLv3 ;
; https://github.com/ice-bit/vulcanos ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
GLOBAL long_mode_start
GLOBAL kernel_loader
EXTERN kernel_main
section .text
[BITS 64] ; Ensure we are in long mode
long_mode_start:
xor ax, ax
mov ss, ax
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
; Call the kernel's main method
call kernel_main ; Call kernel's main function
.loop:
jmp .loop ; If the kernel returns, go into an endless loop
; This will prevent the CPU to execure any non-kernel
; instructions.

5
kernel/drivers/Makefile
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@ -1,11 +1,12 @@
OBJS = tty.o gdt.o idt.o isr.o timer.o keyboard.o \
fs.o cpuid.o
CC = x86_64-elf-gcc # cross-compiler
CC = i686-elf-gcc # cross-compiler
CFLAGS = -m32 -fno-stack-protector -DDEFAULT_USER=root -DDEFAULT_HOSTNAME=vulcan -ffreestanding -Wall -Wextra -Werror -g -c
all:${OBJS}
%.o: %.c
$(CC) $(CFLAGS) $< -o $@
@$(CC) $(CFLAGS) $< -o $@
@echo [CC] Compiling $<...

8
kernel/kernel_main.c
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@ -6,7 +6,7 @@
* https://github.com/ice-bit/vulcanos *
*****************************************/
#include "drivers/tty.h"
//#include "drivers/gdt.h"
#include "drivers/gdt.h"
#include "drivers/idt.h"
#include "drivers/timer.h"
#include "drivers/keyboard.h"
@ -41,9 +41,9 @@ void kernel_main(unsigned long magic, uint32_t addr) {
printf("Loading kernel, wait please...");
// gdt_setup(); // Setup Global Descriptor Table
// PRTOK
// printf(" - Loaded GDT");
gdt_setup(); // Setup Global Descriptor Table
PRTOK
printf(" - Loaded GDT");
idt_setup(); // Setup Interrupt Descriptor Table
PRTOK

7
kernel/libc/Makefile
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@ -1,11 +1,12 @@
OBJS = stdio.o string.o panic.o time.o
VER := $(shell git rev-parse --short HEAD)
CC = x86_64-elf-gcc # cross-compiler
CFLAGS = -DVULCAN_VERSION=$(VER) -m32 -fno-stack-protector -ffreestanding -Wall -Wextra -Werror -g -c
CC = i686-elf-gcc # cross-compiler
CFLAGS = -m32 -DVULCAN_VERSION=$(VER) -fno-stack-protector -ffreestanding -Wall -Wextra -Werror -g -c
all:${OBJS}
%.o: %.c
$(CC) $(CFLAGS) $< -o $@
@$(CC) $(CFLAGS) $< -o $@
@echo [CC] Compiling $<...

5
kernel/mem/Makefile
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@ -1,9 +1,10 @@
OBJS = paging.o kheap.o ordered_array.o
CC = x86_64-elf-gcc # cross-compiler
CC = i686-elf-gcc # cross-compiler
CFLAGS = -m32 -fno-stack-protector -ffreestanding -Wall -Wextra -Werror -g -c
all:${OBJS}
%.o: %.c
${CC} ${CFLAGS} $< -o $@
@${CC} ${CFLAGS} $< -o $@
@echo [CC] Compiling $<...

7
kernel/userspace/Makefile
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@ -1,10 +1,11 @@
OBJS = shell.o fetch.o
VER := $(shell git rev-parse --short HEAD)
CC = x86_64-elf-gcc # cross-compiler
CFLAGS = -DDEFAULT_USER=root -DDEFAULT_HOSTNAME=vulcan -DVULCAN_VERSION=$(VER) -m32 -fno-stack-protector -ffreestanding -Wall -Wextra -Werror -g -c
CC = i686-elf-gcc # cross-compiler
CFLAGS = -m32 -DDEFAULT_USER=root -DDEFAULT_HOSTNAME=vulcan -DVULCAN_VERSION=$(VER) -fno-stack-protector -ffreestanding -Wall -Wextra -Werror -g -c
all:${OBJS}
%.o: %.c
$(CC) $(CFLAGS) $< -o $@
@$(CC) $(CFLAGS) $< -o $@
@echo [CC] Compiling $<...

46
kernel/userspace/shell.c
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@ -10,7 +10,6 @@ void helper() {
puts("\nList of available commands:\n"
"\nhelp - Print this helper"
"\nint - Test some interrupts"
"\nbanner - Show banner"
"\nclear, cls - Clear the screen"
"\nregs - Prints register dump"
"\ntimer - Prints timer tick"
@ -27,23 +26,34 @@ void test_interrupts() {
}
void about() {
printf_color("\n====== IceOS v0.0.1 (c) 2019 Marco 'icebit' Cetica ======\n\n",
LIGHT_CYAN, BLACK);
printf_color(
"iceOS is a x86 monolithic kernel written in C from scratch.\n"
"This project doesn't aim to be a fully functional operating system\n"
"with tons of drivers and graphical applications,\nit's just a learning tool "
"to teach myself concepts like\nOperating Systems, Computer Architecture and Digital Electronics.\n"
"\n\n"
"iceOS comes with the following features:\n"
"- Bare metal booting;\n"
"- VGA driver;\n"
"- Interrupts implementation;\n"
"- PIC & PIT implementation;\n"
"- PS2 driver;\n"
"- Support for x86 architecture;\n"
"- GRUB as bootloader;\n",
LIGHT_GREEN, BLACK);
printf_color("\n \\ /,\n", LIGHT_RED, BLACK);
printf_color(" _________)) ((__________\n", LIGHT_RED, BLACK);
printf_color(" /.-------./\\\\ \\ / //\\.--------.\\", LIGHT_RED, BLACK);
printf_color(" Vulcan", LIGHT_MAGENTA, BLACK);
printf_color("OS ", LIGHT_BROWN, BLACK);
printf_color("is x86 monolithic \n", LIGHT_GREEN, BLACK);
printf_color(" //#######//##\\\\ )) (( //##\\\\########\\\\", LIGHT_RED, BLACK);
printf_color(" kernel written from scratch \n", LIGHT_GREEN, BLACK);
printf_color(" //#######//###(( (( )) ))###\\\\########\\\\", LIGHT_RED, BLACK);
printf_color(" in C following the UNIX \n", LIGHT_GREEN, BLACK);
printf_color("((#######((#####\\\\ \\\\ // //#####))########))", LIGHT_RED, BLACK);
printf_color(" philosophy. \n", LIGHT_GREEN, BLACK);
printf_color(" \\##' `###\\######\\\\ \\)(/ //######/####' `##/", LIGHT_RED, BLACK);
printf_color(" By Marco Cetica 2019-2021 \n", LIGHT_GREEN, BLACK);
printf_color(" )' ``#)' `##\\`->oo<-'/##' `(#'' `(", LIGHT_RED, BLACK);
printf_color(" https://git.io/JtzuAs\n", WHITE, BLACK);
printf_color(" ( ``\\`..'/'' )\n", LIGHT_RED, BLACK);
printf_color(" \\''(\n", LIGHT_RED, BLACK);
printf_color(" `- )\n", LIGHT_RED, BLACK);
printf_color(" / /\n", LIGHT_RED, BLACK);
printf_color(" ( /\\\n", LIGHT_RED, BLACK);
printf_color(" /\\| \\\n", LIGHT_RED, BLACK);
printf_color(" ( \\\n", LIGHT_RED, BLACK);
printf_color(" )\n", LIGHT_RED, BLACK);
printf_color(" /\n", LIGHT_RED, BLACK);
printf_color(" (\n", LIGHT_RED, BLACK);
printf_color(" `\n", LIGHT_RED, BLACK);
}
void register_dump() {

14
kernel/userspace/shell.h
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@ -1,10 +1,10 @@
/**************************************
* VulcanOS Kernel *
* Developed by Marco 'icebit' Cetica *
* (c) 2019-2021 *
* Released under GPLv3 *
* https://github.com/ice-bit/iceOS *
***************************************/
/*****************************************
* VulcanOS Kernel *
* Developed by Marco 'icebit' Cetica *
* (c) 2019-2021 *
* Released under GPLv3 *
* https://github.com/ice-bit/vulcanos *
*****************************************/
#ifndef _SHELL_H_
#define _SHELL_H_