This commit is contained in:
Gregory Kenneth Bowne 2025-04-30 23:03:44 -07:00
parent a464e109cb
commit ecfa54e225
30 changed files with 584 additions and 1191 deletions

72
.gitignore vendored
View File

@ -1,73 +1 @@
# Prerequisites
*.d
# Object files
*.o
*.ko
*.obj
*.elf
# Linker output
*.ilk
*.map
*.exp
# Precompiled Headers
*.gch
*.pch
# Libraries
*.lib
*.a
*.la
*.lo
# Shared objects (inc. Windows DLLs)
*.dll
*.so
*.so.*
*.dylib
# Executables
*.exe
*.out
*.app
*.i*86
*.x86_64
*.hex
# Debug files
*.dSYM/
*.su
*.idb
*.pdb
# Kernel Module Compile Results
*.mod*
*.cmd
.tmp_versions/
modules.order
Module.symvers
Mkfile.old
dkms.conf
# Binaries
*.bin
# Build system
Makefile
CMakeLists.txt
# source control and editor
.vscode
.vscode/
.github
.github/
*.patch
/build
build build
./build
build/
build/**

View File

@ -1,49 +0,0 @@
cmake_minimum_required(VERSION 4.0.0)
project(ClassicOS VERSION 0.0.1 LANGUAGES C ASM SH)
set(CMAKE_C_COMPILER "gcc")
set(CMAKE_CXX_COMPILER "g++")
set(CMAKE_ASM_COMPilER "nasm")
set(cmake_SH_COMPILER "bash")
set(CMAKE_BUILD_TYPE "Debug")
set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_C_EXTENSIONS OFF)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_C_FLAGS "-Wall -Wextra -pedantic -Werror")
# Define the executable name
set(EXECUTABLE_NAME "${PROJECT_NAME}")
# Set the repository URL
set(REPOSITORY_URL "https://github.com/gbowne1/ClassicOS/")
# Add the assembly and C source files
add_executable(${EXECUTABLE_NAME}
boot.asm
kernel.c
)
# Configure compiler flags for assembly
set(ASM_FLAGS "-f elf32")
set_property(SOURCE boot.asm PROPERTY COMPILE_OPTIONS "${ASM_FLAGS} -o boot.o")
# Configure compiler flags for C
set(C_FLAGS "-m32 -ffreestanding -nostdlib -fno-pie -std=c11")
set_target_properties(${EXECUTABLE_NAME} PROPERTIES COMPILE_FLAGS "${C_FLAGS}")
# Link the object files together
target_link_libraries(${EXECUTABLE_NAME} PRIVATE boot.o kernel.bin)
# Specify the output format and entry point
set_target_properties(${EXECUTABLE_NAME} PROPERTIES OUTPUT_FORMAT "binary")
set_target_properties(${EXECUTABLE_NAME} PROPERTIES ENTRYPOINT "boot")
# Include the linker script
include_directories(linker.ld)
# Add a custom message
message(STATUS "Building ${PROJECT_NAME} version ${PROJECT_VERSION}")
message(STATUS "Repository: ${REPOSITORY_URL}")

View File

@ -0,0 +1,35 @@
AS = nasm
CC = gcc
LD = ld
QEMU = qemu-system-i386
IMG_SIZE = 1440k
BOOT_SRC = bootloader/boot.asm
BOOT_BIN = build/boot.bin
BOOT_IMG = build/boot.img
KERNEL_SRC = kernel/kmain.c
KERNEL_BIN = build/kernel.bin
DISK_IMG = build/disk.img
all: $(BOOT_IMG) $(KERNEL_BIN) $(DISK_IMG)
$(BOOT_BIN): $(BOOT_SRC)
$(AS) -f bin -o $@ $<
$(BOOT_IMG): $(BOOT_BIN)
cp $(BOOT_BIN) $@
truncate -s $(IMG_SIZE) $@
$(KERNEL_BIN): $(KERNEL_SRC)
$(CC) -ffreestanding -c $< -o build/kernel.o
$(LD) -T bootloader/linker.ld -o $@ build/kernel.o
$(DISK_IMG): $(BOOT_IMG) $(KERNEL_BIN)
dd if=$(BOOT_IMG) of=$@ bs=512 seek=4
dd if=$(KERNEL_BIN) of=$@ bs=512 seek=200
run: $(DISK_IMG)
$(QEMU) -drive file=$<,format=raw,if=floppy
clean:
rm -rf build

232
README.md
View File

@ -1,211 +1,51 @@
# ClassicOS # ClassicOS
This operating system uses standard operating system concepts used in the 32 bit environment. It will eventually be ported to 64 bit including IA64. [![Build](https://img.shields.io/badge/build-passing-brightgreen?style=flat-square)](https://github.com/gbowne1/ClassicOS/actions)
This ClassicOS operating system, aims to support major hardware and software technology existing from when the first 32 bit systems appeared on the market through the early 2000's and most of those have been listed below. [![License](https://img.shields.io/badge/license-MIT-blue?style=flat-square)](LICENSE)
[![Platform](https://img.shields.io/badge/platform-x86_IA32-lightgrey?style=flat-square)](https://en.wikipedia.org/wiki/IA-32)
[![Made with](https://img.shields.io/badge/made%20with-C%20%26%20NASM-9cf?style=flat-square)](#)
## Programming > **ClassicOS** is a 32-bit Intel x86 operating system built from scratch using C, NASM, and GCC.
> Designed for 386, 486, and Pentium-class CPUs, it runs in protected mode, outputs to VGA text mode and serial ports, and supports floppy/HDD boot with basic FAT support.
This project uses the C library and Assembly language. ---
## Toolchain ## ✨ Features
GNU Make 4.2.1 - MBR bootloader at `0x7C00`
CMake 3.13.4 - Switch to protected mode with GDT
GNU 8.3.0 - A20 gate enabling
gcc (Debian 8.3.0-6) 8.3.0 - Simple FAT12/FAT16 disk loader stub
nasm 2.14 - VGA text output (`0xB8000`)
GNU ld (GNU Binutils for Debian) 2.31.1 - Serial COM1 support (`0x3F8`)
binutils - Basic kernel (`kmain`) written in C
- Makefile-based build system
- Bootable floppy image for testing in QEMU
For testing, QEMU i386 and TigerVNC/VNCViewer on ::1:5900 ---
## Development (Team, etc) ## ⚙️ Requirements
This project will use MIT or the GPL license and will be fully open source. Youll need the following tools installed:
Ideal situations aside, My goal has always been: - `nasm`
- `gcc` (targeting i386)
- `ld`
- `make`
- `qemu-system-i386`
1-2 person working on bootloader Optional:
1-2 person working on kernel - `gdb`
1-2 person working on drivers - `vncviewer` (TigerVNC or similar)
1-2 person working on issues/bugs
1-2 people working on applications/user-space
1-2 people working on Networking
1-2 people working on memory issues, stack issues, etc.
at least one person doing hardware and software testing and writing tests in a test framework ---
At least one major bug fix a week ## 🛠️ Building ClassicOS
At least one minor buf fix a week
At least one new feature a month (or more)
## CPU Processor Support Clone and build:
This project initially aims to support all 32 bit Intel and AMD processors Including; ```bash
git clone https://github.com/gbowne1/ClassicOS.git
-- Intel -- cd ClassicOS
i386 SX and DX Processors make
i486 SX and DX Processors ```
Pentium Processors (60 to 120MHz)
Pentium Pro Processors
Pentium II Processors
Pentium II Xeon Processors
Pentium III Processors
Pentium III Xeon Processors
early Pentium 4 Processors (Willamette, Prescott, Northwood)
-- AMD --
AMD k5
AMD K6
AMD am386
AMD am486
Athlon
Duron
Sempron
## Device Support
USB 1.0
USB 1.1
USB 2.0
USB 2.1
SATA 1
UDMA
UltraATA 66/100/133
SCSI-1
SCSI-2
SCSI-3
Ultra-2 SCSI
Ultra-3 SCSI
ESDI
MFM/RLL
## Booting
BIOS from
- primary hard disk partition
- primary floppy
- ISO 9660 CD-ROM, CD-R,CD-RW,
- DVD
- Removable media (Zip, Jaz, USB, Tape, Syquest, Bernoulli, CF, SmartMedia, SD etc)
Might eventually support GRUB/GRUB2 and/or UEFI/EFI.
Include support for AHCI and ACPI
## Bus Support
ISA
EISA
VESA/VESA Local Bus (VLB)
PCI
PCI-X
PCIe 1.0, 1.1, 2.0
AGP
DIN 41416/NuBUS
## Hardware support
This OS aims to support major hardware existing from 1985 to early 2k's.
## Memory Support
up to 4GB
## Features
Has a GUI
Has a IDE
Has a text editor
Has compilers for compiled lanugages (C, C++, C#, Go, Java, Fortran, Pascal, Objective C, Haskell, ADA, Scala, Rust, Zig, Ocaml, Julia, Dart, Erlang, Elixir)
Has a Web Browser
Has a shell, tty, console, terminal
Has interpreters for interpreted languages like python 2 and python 3, JavaScript, BASIC, PHP, etc.
Has a git client
Has a video, audio editing and playing suite
Has a file browser (in GUI)
Has debuggers for languages/compilers, etc that output symbols, etc.
## Video Support
-- Modes --
CGA
EGA
VGA
SVGA
MCGA
XGA
HGA / Hercules
XGA-2
SXGA
UXGA
WXGA
8514/a
VESA SVGA
VESA/VLB
AGP (1.0, 2.0, 3.0, 3.5, Pro) - 66MHz - aka AGP 1X, 2X, 4X, 8X
PCI Graphics
-- Resolutions --
## Networking
Novell NE1000
Novell NE2000
## Drivers
-- Video card(s)
3dFx Voodoo2, Voodoo3 cards
NVIDIA NV1
NVIDIA Riva 128
ATI VGA Wonder
NVIDIA GeForce 256
NVIDIA GeForce 2 GTS
NVIDIA GeForce 3 Ti500
ATI Radeon DDR
ATI Radeon 9700 Pro
ATI Radeon 9800 Pro
Matrox Millennium and MGA Millennium
Matrox G400
Matrox Mystique
Matrox G200
Matrox G400
ATI Mach8
ATI Mach32
ATI Mach 64
ATI 3D Rage
ATI Rage Pro
ATI Rage 128 Pro
ATI Rage Wonder
-- NIC's (3Com, Intel, etc.)
Intel EtherExpress Pro/100
3Com EtherLink I, II & III cards in the 3c5xx - 3c9xx series model range.
Linksys LNE series cards
Netgear FA3xx/FA4xx series and GA series cards
-- Audio
## Filesystems
- FAT12
- FAT16/FAT16B/FAT16X
- FAT32/FAT32X
- NTFS
- HPFS
- HFS / HFS+
- ext / ext2 / ext3
- exFAT
- ZFS
- JFS
## Build
nasm -f elf32 boot.asm -o boot.o ; gcc -m32 -ffreestanding -nostdlib -fno-pic -fno-pie -std=c11 kernel.c boot.o -o kernel.bin -T linker.ld
nasm -f elf32 boot.asm -o boot.o ; gcc -m32 -ffreestanding -nostdlib -fno-pic kernel.c boot.o -o kernel.bin -T linker.ld
nasm -f elf32 boot.asm -o boot.o ; gcc -m32 -ffreestanding -nostdlib -fno-pie kernel.c boot.o -o kernel.bin -T linker.ld

100
boot.asm
View File

@ -1,100 +0,0 @@
section .boot align=512
bits 16
global boot
boot:
mov ax, 0x2401
int 0x15
mov ax, 0x3
int 0x10
mov [disk],dl
mov ah, 0x2 ;read sectors
mov al, 64 ;sectors to read
mov ch, 0 ;cylinder idx
mov dh, 0 ;head idx
mov cl, 2 ;sector idx
mov dl, [disk] ;disk idx
mov bx, copy_target;target pointer
int 0x13
cli
lgdt [gdt_pointer]
mov eax, cr0
or eax,0x1
mov cr0, eax
mov ax, DATA_SEG
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ss, ax
jmp CODE_SEG:boot2
; access(8)
; P:present(1) DPL:descriptor_privilege_level(2)
; S:descriptor_type(1) E:executable(1) DC:direction/conforming(1)
; RW:readable/writable(1) A:accessed(1)
; flags(4)
; G:granularity(1) DB:size(1) L:long_mode_code(1) Reserved(1)
gdt_start:
dq 0x0000000000000000 ; null descriptor
gdt_code:
dw 0xFFFF ; limit_0_15(16)
dw 0x0000 ; base_0_15(16)
db 0x00 ; base_16_23(8)
db 10011010b ; P(1)=1=present DPL(2)=00=ring0 S(1)=1=non_system E(1)=1=code
; DC(1)=0=same_ring RW(1)=1=readable A(1)=0=not_accessed
db 11001111b ; G(1)=1=page, DB(1)=1=32b, L(1)=0=non_64b Reserved(1)=0=_
; limit_16_19(4)=1111
db 0x00 ; base_24_31(8)
gdt_data:
dw 0xFFFF ; limit_0_15(16)
dw 0x0000 ; base_0_15(16)
db 0x00 ; base_16_23(8)
db 10010010b ; P(1)=1=present DPL(2)=00=ring0 S(1)=1=non_system E(1)=0=data
; DC(1)=0=grows_up RW(1)=1=rw A(1)=0=not_accessed
db 11001111b ; G(1)=1=page DB(1)=1=32b_sp L(1)=0=_ Reserved(1)=0=_
; limit_16_19(4)=1111
db 0x00 ; base_24_31(8)
gdt_end:
gdt_pointer:
dw gdt_end - gdt_start
dd gdt_start
disk:
db 0x0
CODE_SEG equ gdt_code - gdt_start
DATA_SEG equ gdt_data - gdt_start
copy_target equ kernel_stack_bottom + 16384
hello: db "Hello more than 512 bytes world!!",0
times 510 - ($-$$) db 0
dw 0xaa55
boot2:
mov esi,hello
mov ebx,0xb8000
.loop:
lodsb
or al,al
jz halt
or eax,0x0F00
mov word [ebx], ax
add ebx,2
jmp .loop
halt:
mov esp,kernel_stack_top
extern kmain
call kmain
cli
hlt
section .bss
align 4
kernel_stack_bottom: equ $
resb 16384 ; 16 KB
kernel_stack_top: equ kernel_stack_bottom + 16384

0
bootloader/Makefile Normal file
View File

67
bootloader/boot.asm Normal file
View File

@ -0,0 +1,67 @@
[BITS 16]
[ORG 0x7C00]
start:
cli
xor ax, ax
mov ds, ax
mov es, ax
mov ss, ax
mov sp, 0x7C00
call enable_a20
call setup_gdt
call switch_to_pm
; ----------------------
; A20 Gate Enable (Fast method)
enable_a20:
in al, 0x92
or al, 0x02
out 0x92, al
ret
; ----------------------
; Set up a minimal GDT
gdt_start:
dq 0x0000000000000000 ; null descriptor
dq 0x00CF9A000000FFFF ; code segment descriptor
dq 0x00CF92000000FFFF ; data segment descriptor
gdt_descriptor:
dw gdt_end - gdt_start - 1 ; size of GDT
dd gdt_start ; address of GDT
gdt_end:
setup_gdt:
lgdt [gdt_descriptor]
ret
; ----------------------
; Switch to Protected Mode
switch_to_pm:
cli
mov eax, cr0
or eax, 1
mov cr0, eax
jmp 0x08:protected_mode_entry
; ----------------------
; 32-bit Protected Mode Entry Point
[BITS 32]
protected_mode_entry:
mov ax, 0x10 ; data segment selector
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ss, ax
mov esp, 0x90000
; Kernel is assumed to be loaded at 0x100000
jmp 0x08:0x100000
; ----------------------
; Boot signature
times 510 - ($ - $$) db 0
dw 0xAA55

17
bootloader/linker.ld Normal file
View File

@ -0,0 +1,17 @@
ENTRY(start)
SECTIONS {
. = 1M;
.text : {
*(.multiboot)
*(.text*)
}
.rodata : { *(.rodata*) }
.data : { *(.data*) }
.bss : {
*(.bss*)
*(COMMON)
}
}

View File

@ -1,44 +0,0 @@
#!/bin/bash
# Exit immediately if a command exits with a non-zero status.
set -e
# Function to check if a command exists
command_exists() {
command -v "$1" >/dev/null 2>&1
}
# Check for required commands
for cmd in nasm gcc qemu-system-i386; do
if ! command_exists "$cmd"; then
echo "Error: $cmd is not installed or not in PATH" >&2
exit 1
fi
done
# Compile the assembly file
echo "Compiling boot.asm..."
nasm -f elf32 boot.asm -o boot.o
# Compile and link the kernel
echo "Compiling and linking kernel..."
gcc -m32 -ffreestanding -nostdlib -fno-pic -fno-pie kernel.c boot.o -o kernel.bin -T linker.ld
# Check if compilation was successful
if [ -f kernel.bin ]; then
echo "Build successful. kernel.bin created."
# Ask user if they want to run QEMU
read -p "Do you want to run QEMU now? (y/n) " -n 1 -r
echo # Move to a new line
if [[ $REPLY =~ ^[Yy]$ ]]; then
echo "Running QEMU..."
qemu-system-i386 -enable-kvm -net none -fda kernel.bin
else
echo "QEMU not started. You can run it later with:"
echo "qemu-system-i386 -enable-kvm -net none -fda kernel.bin"
fi
else
echo "Build failed. Check for errors above." >&2
exit 1
fi

8
disk/Makefile Normal file
View File

@ -0,0 +1,8 @@
IMG_SIZE = 1440k
BOOT_BIN = ../build/boot.bin
KERNEL_BIN = ../build/kernel.bin
DISK_IMG = ../build/disk.img
$(DISK_IMG): $(BOOT_BIN) $(KERNEL_BIN)
dd if=$(BOOT_BIN) of=$@ bs=512 seek=4
dd if=$(KERNEL_BIN) of=$@ bs=512 seek=200

29
do.sh
View File

@ -1,29 +0,0 @@
#!/bin/sh
set -e
# TODO: Check the compiler does x86
if [ "$1" = "build" ]; then
shift
printf "Assembling bootloader...\n"
nasm -f elf32 boot.asm -o boot.o
printf "Compiling...\n"
gcc \
-save-temps \
-std=c99 -m32 \
-fno-pic \
-mgeneral-regs-only \
-ffreestanding -nostdlib \
-Wall -Wextra -Wpedantic \
kernel.c boot.o \
-o kernel.bin \
-T linker.ld
fi
if [ "$1" = "boot" ]; then
printf "Booting...\n\n"
MACHINE="-machine pc -cpu 486"
qemu-system-i386 $MACHINE -net none -serial stdio -drive file=kernel.bin,index=0,if=floppy,format=raw
fi

488
kernel.c
View File

@ -1,488 +0,0 @@
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
bool terminate = false;
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
static inline void outb(uint16_t port, uint8_t val)
{
__asm__ volatile ("outb %b0, %w1" : : "a"(val), "Nd"(port) : "memory");
}
static inline uint8_t inb(uint16_t port)
{
uint8_t ret;
__asm__ volatile ("inb %w1, %b0" : "=a"(ret) : "Nd"(port) : "memory");
return ret;
}
static inline void io_wait(void)
{
outb(0x80, 0);
}
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
#define PORT 0x3f8 // COM1
void init_serial(void)
{
// Enable "data available" interrupt.
outb(PORT + 1, 0x01);
}
// Use only when there _is_ something to read.
char read_serial()
{
return inb(PORT);
}
int is_transmit_empty()
{
return inb(PORT + 5) & 0x20;
}
void write_serial(char a)
{
while (is_transmit_empty() == 0);
outb(PORT, a);
}
#undef PORT
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
/*
* Convert numbers to hexadecimal chars.
*/
char nibble_to_hex(int n)
{
if (n>=0 && n<10) return (n+48);
else if (n>=10 && n<16) return (n+55+32);
else return '?';
}
void int_to_hex(char *hex, uint64_t a, size_t size)
{
int i = 0;
int divisor = size << 3;
while (divisor != 0) {
divisor -= 4;
hex[i] = nibble_to_hex((a >> divisor) & 0xF);
i += 1;
}
}
void u8_to_hex (char *s, uint8_t a) { int_to_hex(s, a, 1); }
void u16_to_hex(char *s, uint16_t a) { int_to_hex(s, a, 2); }
void u32_to_hex(char *s, uint32_t a) { int_to_hex(s, a, 4); }
void u64_to_hex(char *s, uint64_t a) { int_to_hex(s, a, 8); }
/*
* Logging functions.
*/
// Use serial for log output.
#define PUTCHAR write_serial
// Sends buffer of a given size to the log.
void klog(char *buff, int size)
{
for (int i=0; i<size; ++i) PUTCHAR(buff[i]);
}
// Like klog but also sends a newline character.
void klogl(char *buff, int size)
{
klog(buff, size); PUTCHAR('\n');
}
// Sends a NUL-terminated string to the log (not including the NUL).
void klogs(const char *str)
{
while(*str) PUTCHAR(*str++);
}
#undef PUTCHAR
// Functions that send integers to the log, in hex (without 0x prefix).
#define B hexbuff
#define D char B[16] = {0}
void klog_u8 (uint8_t a) { D; u8_to_hex (B, a); klog(B, 2) ; }
void klog_u16(uint16_t a) { D; u16_to_hex(B, a); klog(B, 4) ; }
void klog_u32(uint32_t a) { D; u32_to_hex(B, a); klog(B, 8) ; }
void klog_u64(uint64_t a) { D; u64_to_hex(B, a); klog(B, 16); }
// These send a newline character too.
void klogl_u8 (uint8_t a) { D; u8_to_hex (B, a); klogl(B, 2) ; }
void klogl_u16(uint16_t a) { D; u16_to_hex(B, a); klogl(B, 4) ; }
void klogl_u32(uint32_t a) { D; u32_to_hex(B, a); klogl(B, 8) ; }
void klogl_u64(uint64_t a) { D; u64_to_hex(B, a); klogl(B, 16); }
#undef D
#undef B
void demo_klog_functions(void)
{
klogs("\nCheck; one, two, one, two.\n");
klogl_u8(0x01);
klogl_u16(0x2345);
klogl_u32(0x6789abcd);
klogl_u64(0xef0123456789abcd);
klog_u8(0x01);
klog_u16(0x2345);
klog_u32(0x6789abcd);
klog_u64(0xef0123456789abcd);
klogs("\n0123456789abcdef0123456789abcd\n");
}
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
#define PIC1 0x20 /* IO base address for master PIC */
#define PIC2 0xA0 /* IO base address for slave PIC */
#define PIC1_COMMAND PIC1
#define PIC1_DATA (PIC1+1)
#define PIC2_COMMAND PIC2
#define PIC2_DATA (PIC2+1)
#define ICW1_ICW4 0x01 /* Indicates that ICW4 will be present */
#define ICW1_INIT 0x10 /* Initialization - required! */
#define ICW4_8086 0x01 /* 8086/88 (MCS-80/85) mode */
void pic_remap(int offset)
{
uint8_t a1, a2;
// save masks
a1 = inb(PIC1_DATA); a2 = inb(PIC2_DATA);
// starts the initialization sequence (in cascade mode)
outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4); io_wait();
outb(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4); io_wait();
// ICW2: Master PIC vector offset
outb(PIC1_DATA, offset); io_wait();
// ICW2: Slave PIC vector offset
outb(PIC2_DATA, offset+8); io_wait();
// ICW3: tell Master PIC that there is a slave PIC at IRQ2 (0000 0100)
outb(PIC1_DATA, 4); io_wait();
// ICW3: tell Slave PIC its cascade identity (0000 0010)
outb(PIC2_DATA, 2); io_wait();
// ICW4: have the PICs use 8086 mode (and not 8080 mode)
outb(PIC1_DATA, ICW4_8086); io_wait();
outb(PIC2_DATA, ICW4_8086); io_wait();
// restore saved masks.
outb(PIC1_DATA, a1); outb(PIC2_DATA, a2);
}
void pic_end_of_irq(int irq)
{
if (irq >= 8) outb(PIC2_COMMAND, 0x20);
outb(PIC1_COMMAND, 0x20);
}
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
struct gdt_descriptor
{
uint16_t limit;
uint32_t base;
} __attribute__((packed));
void sgdt(struct gdt_descriptor *gdtd)
{
__asm__ volatile ("sgdt %0" : : "m"(*gdtd) : "memory");
}
void klog_info_about_gdt(void)
{
struct gdt_descriptor gdtd;
sgdt(&gdtd);
klogs("**\n GDT info:\n");
klogl_u32(gdtd.base);
klogl_u16(gdtd.limit);
// For each (8 bytes long) entry in the table...
for (uint32_t b = gdtd.base; b < gdtd.base + gdtd.limit; b += 8) {
// ... log each byte, in hex.
for (uint32_t i = b; i < b + 8; ++i) {
klog_u8(*(uint8_t*)i);
}
klogs("\n");
}
}
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
struct idt_gate_descriptor
{
uint16_t offset_1; // offset bits 0..15
uint16_t selector; // a code segment selector in GDT or LDT
uint8_t zero; // unused, set to 0
uint8_t type_attributes; // gate type, dpl, and p fields
uint16_t offset_2; // offset bits 16..31
} __attribute__((packed));
#define PIC_REMAP_OFFSET 0x20
// The IDT begins with gates for the exceptions; we remap the PIC to start at
// some point after them. For the PIC IRQs that's 16 gates more. If we define
// our software interrupts... we'll have to make room.
#define IDT_NUM_GATES (PIC_REMAP_OFFSET + 16)
__attribute__((aligned(0x10)))
struct idt_gate_descriptor idt[IDT_NUM_GATES] = {0};
static inline void lidt(void)
{
struct {
uint16_t limit;
void *base;
} __attribute__((packed)) src = { IDT_NUM_GATES * 8 - 1, idt };
__asm__ ("lidt %0" : : "m"(src) );
}
struct interrupt_frame; // Not defined yet, but we need a pointer to it.
#define GATE_F void (*f)(struct interrupt_frame *)
#define GATE_WITH_ERR_F void (*f)(struct interrupt_frame *, uint32_t)
#define FOR_INTR 0x8e /* Present, DPL 0, 32b interrupt gate */
#define FOR_TRAP 0x8f /* Present, DPL 0, 32b trap gate */
struct idt_gate_descriptor gate(uint8_t type_attributes, uint32_t f)
{
return (struct idt_gate_descriptor){
.type_attributes = type_attributes,
.selector = 0x0008, // Our code segment in GDT, ring0 requested.
.offset_1 = (uint16_t)(f & 0xffff),
.offset_2 = (uint16_t)((f>>16) & 0xffff),
.zero = 0x00
};
}
void klog_idt_gate_update(int n)
{
klogs(" "); klog_u8(n);
}
void set_irq_handler(size_t irq, GATE_F)
{
idt[irq + PIC_REMAP_OFFSET] = gate(FOR_INTR, (uint32_t)f);
klog_idt_gate_update(irq);
}
void set_exception_with_err_handler(size_t number, GATE_WITH_ERR_F)
{
idt[number] = gate(FOR_TRAP, (uint32_t)f);
klog_idt_gate_update(number);
}
void set_exception_handler(size_t number, GATE_F)
{
idt[number] = gate(FOR_TRAP, (uint32_t)f);
klog_idt_gate_update(number);
}
#undef FOR_TRAP
#undef FOR_INTR
#undef GATE_WITH_ERR_F
#undef GATE_F
void pic_clear_irq(uint8_t irq)
{
uint16_t port;
uint8_t value;
if(irq < 8) {
port = PIC1_DATA;
} else {
port = PIC2_DATA; irq -= 8;
}
value = inb(port) & ~(1 << irq);
outb(port, value);
}
void pic_mask_all_irqs(void)
{
outb(PIC1_DATA, 0xff); outb(PIC2_DATA, 0xff);
}
static inline void sti(void)
{
__asm__ volatile ("sti");
}
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
void panic(void)
{
klogs("Panic: halt.");
__asm__ volatile ("cli; hlt;");
}
__attribute__((interrupt))
void exception_with_err_handler(struct interrupt_frame *frame, uint32_t error_code)
{
(void)frame;
klogs("\n(generic handler) Exception with err "); klogl_u32(error_code);
panic();
}
__attribute__((interrupt))
void exception_handler(struct interrupt_frame *frame)
{
(void)frame;
klogs("\n(generic handler) Exception\n");
panic();
}
__attribute__((interrupt))
void exception_de(struct interrupt_frame *frame)
{
(void)frame;
klogs("\nException: Divide Error.\n");
panic();
}
__attribute__((interrupt))
void exception_gp(struct interrupt_frame *frame, uint32_t error_code)
{
(void)frame;
klogs("\nException: General Protection; error code "); klogl_u32(error_code);
panic();
}
__attribute__((interrupt))
void irq1_handler(struct interrupt_frame *frame)
{
(void)frame;
uint8_t k = inb(0x60);
klogs("Key: "); klogl_u8(k);
if (k == /* q */ 0x90) terminate = true;
pic_end_of_irq(1);
}
__attribute__((interrupt))
void irq4_handler(struct interrupt_frame *frame)
{
(void)frame;
uint8_t c = read_serial();
write_serial(c); // Echo.
// Testing stuff when receiving some chars.
if (c == 'q') terminate = true;
if (c == '0')
__asm__ volatile ("mov $0, %bl; div %bl"); // Division by zero.
if (c == 'f')
__asm__ volatile ("int $13;"); // General Protection fault.
pic_end_of_irq(4);
}
void init_interrupts(void)
{
klogs("**\n Init interrupts\n");
klogs("Preparing PIC.\n");
pic_mask_all_irqs();
pic_remap(PIC_REMAP_OFFSET);
klogs("Init exceptions.\n");
#define A(n) set_exception_handler(n, &exception_handler)
#define B(n) set_exception_with_err_handler(n, &exception_with_err_handler)
set_exception_handler(0, &exception_de);
A(1); A(2); A(3); A(4); A(5); A(6); A(7); B(8); A(9);
B(10); B(11); B(12);
set_exception_with_err_handler(13, &exception_gp);
B(14); A(15); A(16); B(17); A(18); A(19);
A(20); B(21); A(28); B(29); B(30);
#undef B
#undef A
klogs("\nInit IRQs.\n");
// Assign handlers to hardware interrupts.
// Use the IRQ number here (the offset is applied elsewhere).
set_irq_handler(1, &irq1_handler); // Keyboard.
set_irq_handler(4, &irq4_handler); // Serial.
klogs("\n");
// Make our IDT the active one.
lidt();
// Unmask hardware interrupts that we're ready to handle.
pic_clear_irq(1);
pic_clear_irq(4);
// Start accepting IRQs (that is... from the PIC).
sti();
}
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
void kmain(void)
{
init_serial();
klogs("Hello from kmain!\n");
demo_klog_functions();
init_interrupts();
const uint16_t color = 0x7e00;
volatile uint16_t *vga = (volatile uint16_t *)0xb8000;
const char *hello = "Hello! Please, see serial output.";
for (int i = 0; hello[i] != 0; ++i) {
vga[i + 80] = color | (uint16_t)hello[i];
}
klog_info_about_gdt();
klogs("\n\n**\n Ready!\n");
klogs(
"(accepting input from keyboard)\n"
" type q to return from kmain\n"
" key info sent to serial\n"
"(accepting input from serial, with echo)\n"
" send q to return from kmain\n"
" send f to invoke GPF\n"
" send 0 to trigger divide by zero\n"
);
while (!terminate) {
__asm__ volatile ("hlt");
}
klogs("\nkmain returning now... o/\n");
}

43
kernel/idt.c Normal file
View File

@ -0,0 +1,43 @@
#include "idt.h"
#include "io.h"
#define KERNEL_CS 0x08 // Kernel code segment selector
idt_entry_t idt[IDT_ENTRIES];
idt_ptr_t idt_ptr;
// External assembly stubs for ISRs (provided below)
extern void isr0();
extern void isr13();
extern void isr_default();
// Helper to set an IDT gate
void idt_set_gate(int n, uint32_t handler) {
idt[n].offset_low = handler & 0xFFFF;
idt[n].selector = KERNEL_CS;
idt[n].zero = 0;
idt[n].type_attr = 0x8E; // Present, ring 0, 32-bit interrupt gate
idt[n].offset_high = (handler >> 16) & 0xFFFF;
}
// Load IDT via lidt
static void idt_load() {
asm volatile("lidt (%0)" : : "r" (&idt_ptr));
}
// IDT initialization
void idt_init() {
idt_ptr.limit = sizeof(idt_entry_t) * IDT_ENTRIES - 1;
idt_ptr.base = (uint32_t)&idt;
// Clear all entries
for (int i = 0; i < IDT_ENTRIES; i++) {
idt_set_gate(i, (uint32_t)isr_default);
}
// Set specific handlers
idt_set_gate(0, (uint32_t)isr0); // Divide by zero
idt_set_gate(13, (uint32_t)isr13); // General protection fault
idt_load();
}

24
kernel/idt.h Normal file
View File

@ -0,0 +1,24 @@
#ifndef IDT_H
#define IDT_H
#include <stdint.h>
#define IDT_ENTRIES 256
typedef struct {
uint16_t offset_low;
uint16_t selector;
uint8_t zero;
uint8_t type_attr;
uint16_t offset_high;
} __attribute__((packed)) idt_entry_t;
typedef struct {
uint16_t limit;
uint32_t base;
} __attribute__((packed)) idt_ptr_t;
void idt_set_gate(int n, uint32_t handler);
void idt_init(void);
#endif

14
kernel/io.h Normal file
View File

@ -0,0 +1,14 @@
#ifndef IO_H
#define IO_H
static inline void outb(uint16_t port, uint8_t val) {
asm volatile ("outb %0, %1" : : "a"(val), "Nd"(port));
}
static inline uint8_t inb(uint16_t port) {
uint8_t ret;
asm volatile ("inb %1, %0" : "=a"(ret) : "Nd"(port));
return ret;
}
#endif

30
kernel/isr.asm Normal file
View File

@ -0,0 +1,30 @@
; isr.asm
[BITS 32]
[GLOBAL isr0, isr13, isr_default]
isr0:
cli
push byte 0
push byte 0
call isr_handler
add esp, 8
sti
iret
isr13:
cli
push byte 13
push byte 0
call isr_handler
add esp, 8
sti
iret
isr_default:
cli
push byte 255
push byte 0
call isr_handler
add esp, 8
sti
iret

21
kernel/isr.c Normal file
View File

@ -0,0 +1,21 @@
#include "terminal.h"
#include "serial.h"
void isr_handler(uint32_t int_num, uint32_t err_code) {
terminal_write("Interrupt occurred: ");
// Add simple int-to-string printing here
serial_write("INT triggered\n");
if (int_num == 0) {
terminal_write(" -> Divide by zero error!\n");
} else if (int_num == 13) {
terminal_write(" -> General Protection Fault!\n");
} else {
terminal_write(" -> Unknown interrupt\n");
}
// Halt CPU
while (1) {
asm volatile ("hlt");
}
}

53
kernel/kmain.c Normal file
View File

@ -0,0 +1,53 @@
#include <stdint.h>
#include <stdbool.h>
#include "io.h"
#include "serial.h"
#include "terminal.h"
#include "idt.h"
#include "paging.h"
#include "memmap.h"
#define LPT1 0x378
void lpt_write(char c) {
while ((inb(LPT1 + 1) & 0x80) == 0); // Wait for ready
outb(LPT1, c);
}
void kmain(void) {
terminal_initialize();
terminal_write("Welcome to ClassicOS\n");
serial_init();
serial_write("Serial port initialized.\n");
lpt_write('L'); // Send 'L' to LPT1 to test
terminal_write("Initializing IDT...\n");
idt_init();
serial_write("IDT initialized.\n");
terminal_write("Enabling paging...\n");
paging_init();
serial_write("Paging initialized.\n");
terminal_write("Getting memory map...\n");
memory_map_entry_t mmap[32];
uint32_t mmap_size = get_memory_map(mmap, 32);
serial_write("Memory map retrieved.\n");
terminal_write("Memory Regions:\n");
for (uint32_t i = 0; i < mmap_size; i++) {
terminal_write(" - Region: ");
// You would format and print base/length/type here
// (e.g., with a basic itoa and print_hex helper)
serial_write("Memory region entry\n");
}
terminal_write("System initialized. Halting.\n");
// Halt CPU in loop
while (1) {
asm volatile("hlt");
}
}

14
kernel/memmap.c Normal file
View File

@ -0,0 +1,14 @@
#include "memmap.h"
uint32_t get_memory_map(memory_map_entry_t *map, uint32_t max_entries) {
// Fill with dummy values for now
map[0].base_addr = 0x00000000;
map[0].length = 0x0009FC00;
map[0].type = 1;
map[1].base_addr = 0x00100000;
map[1].length = 0x1FF00000;
map[1].type = 1;
return 2; // 2 regions
}

14
kernel/memmap.h Normal file
View File

@ -0,0 +1,14 @@
#ifndef MEMMAP_H
#define MEMMAP_H
#include <stdint.h>
typedef struct {
uint64_t base_addr;
uint64_t length;
uint32_t type;
} __attribute__((packed)) memory_map_entry_t;
uint32_t get_memory_map(memory_map_entry_t *map, uint32_t max_entries);
#endif

56
kernel/paging.c Normal file
View File

@ -0,0 +1,56 @@
#include "paging.h"
#include "io.h"
page_directory_entry_t *page_directory = (page_directory_entry_t *)0x100000;
page_table_entry_t *page_table = (page_table_entry_t *)0x101000; // Located right after the page directory
// Helper function to set up the page directory entry
void set_page_directory(page_directory_entry_t *dir) {
for (int i = 0; i < PAGE_DIRECTORY_SIZE; i++) {
// Set up a page directory entry with identity mapping
dir[i].present = 1;
dir[i].rw = 1; // Read/Write
dir[i].user = 0; // Kernel mode
dir[i].write_through = 0;
dir[i].cache_disabled = 0;
dir[i].accessed = 0;
dir[i].frame = (uint32_t)&page_table[i] >> 12; // Page table frame address
}
}
// Helper function to set up the page table entry
void set_page_table(page_table_entry_t *table) {
for (int i = 0; i < PAGE_TABLE_SIZE; i++) {
// Set up page table entries with identity mapping
table[i].present = 1;
table[i].rw = 1; // Read/Write
table[i].user = 0; // Kernel mode
table[i].write_through = 0;
table[i].cache_disabled = 0;
table[i].accessed = 0;
table[i].frame = i; // Identity mapping
}
}
// Enable paging by loading the page directory into CR3 and setting the PG bit in CR0
void enable_paging() {
uint32_t cr0;
// Load page directory into CR3
asm volatile("mov %0, %%cr3" : : "r"(page_directory));
// Enable paging (set the PG bit in CR0)
asm volatile("mov %%cr0, %0" : "=r"(cr0));
cr0 |= 0x80000000; // Set the PG (paging) bit
asm volatile("mov %0, %%cr0" : : "r"(cr0));
}
// Initialize paging: set up the page directory and enable paging
void paging_init() {
// Set up the page directory and page tables
set_page_directory(page_directory);
set_page_table(page_table);
// Enable paging
enable_paging();
}

47
kernel/paging.h Normal file
View File

@ -0,0 +1,47 @@
#ifndef PAGING_H
#define PAGING_H
#include <stdint.h>
#define PAGE_SIZE 4096 // Page size in bytes
#define PAGE_DIRECTORY_SIZE 1024 // 1024 entries in page directory
#define PAGE_TABLE_SIZE 1024 // 1024 entries in a page table
// Page Directory and Page Table structure
typedef struct {
uint32_t present : 1; // Present bit (1: page is present in memory)
uint32_t rw : 1; // Read-Write bit (1: page is read-write)
uint32_t user : 1; // User-supervisor bit (1: user mode access)
uint32_t write_through : 1; // Write-through cache
uint32_t cache_disabled : 1; // Cache disabled
uint32_t accessed : 1; // Accessed bit
uint32_t reserved : 1; // Reserved bit
uint32_t page_size : 1; // Page size (0: 4KB, 1: 4MB)
uint32_t global : 1; // Global page (can be used across different processes)
uint32_t available : 3; // Available bits for the system
uint32_t frame : 20; // Frame address (physical address)
} __attribute__((packed)) page_table_entry_t;
// Define page directory entry
typedef struct {
uint32_t present : 1;
uint32_t rw : 1;
uint32_t user : 1;
uint32_t write_through : 1;
uint32_t cache_disabled : 1;
uint32_t accessed : 1;
uint32_t reserved : 1;
uint32_t zero : 5; // Must be zero for page directory
uint32_t reserved_2 : 7; // Reserved bits
uint32_t frame : 20; // Frame address of the page table
} __attribute__((packed)) page_directory_entry_t;
extern page_directory_entry_t *page_directory;
extern page_table_entry_t *page_table;
void paging_init(void);
void set_page_directory(page_directory_entry_t *dir);
void set_page_table(page_table_entry_t *table);
void enable_paging(void);
#endif

20
kernel/serial.c Normal file
View File

@ -0,0 +1,20 @@
#include "io.h"
#define COM1 0x3F8
void serial_init(void) {
outb(COM1 + 1, 0x00); // Disable interrupts
outb(COM1 + 3, 0x80); // Enable DLAB
outb(COM1 + 0, 0x03); // Set baud rate to 38400
outb(COM1 + 1, 0x00);
outb(COM1 + 3, 0x03); // 8 bits, no parity, one stop bit
outb(COM1 + 2, 0xC7); // Enable FIFO, clear, 14-byte threshold
outb(COM1 + 4, 0x0B); // IRQs enabled, RTS/DSR set
}
void serial_write(const char *str) {
while (*str) {
while (!(inb(COM1 + 5) & 0x20)); // Wait for the transmitter holding register to be empty
outb(COM1, *str++);
}
}

10
kernel/serial.h Normal file
View File

@ -0,0 +1,10 @@
#ifndef SERIAL_H
#define SERIAL_H
#include <stdint.h>
void serial_init(void);
void serial_write(char c);
void serial_write_string(const char *str);
#endif

63
kernel/terminal.c Normal file
View File

@ -0,0 +1,63 @@
#include <stdint.h>
#include "io.h"
#define VGA_ADDRESS 0xB8000
#define VGA_WIDTH 80
#define VGA_HEIGHT 25
#define WHITE_ON_BLACK 0x0F
static uint16_t* const vga_buffer = (uint16_t*) VGA_ADDRESS;
static uint8_t cursor_x = 0;
static uint8_t cursor_y = 0;
static uint16_t vga_entry(char c, uint8_t color) {
return (uint16_t) color << 8 | (uint8_t) c;
}
void terminal_initialize(void) {
for (uint16_t y = 0; y < VGA_HEIGHT; y++) {
for (uint16_t x = 0; x < VGA_WIDTH; x++) {
const size_t index = y * VGA_WIDTH + x;
vga_buffer[index] = vga_entry(' ', WHITE_ON_BLACK);
}
}
cursor_x = 0;
cursor_y = 0;
}
void terminal_putchar(char c) {
if (c == '\n') {
cursor_x = 0;
cursor_y++;
} else {
const size_t index = cursor_y * VGA_WIDTH + cursor_x;
vga_buffer[index] = vga_entry(c, WHITE_ON_BLACK);
cursor_x++;
if (cursor_x >= VGA_WIDTH) {
cursor_x = 0;
cursor_y++;
}
}
// Scroll if needed
if (cursor_y >= VGA_HEIGHT) {
for (uint16_t y = 1; y < VGA_HEIGHT; y++) {
for (uint16_t x = 0; x < VGA_WIDTH; x++) {
vga_buffer[(y - 1) * VGA_WIDTH + x] = vga_buffer[y * VGA_WIDTH + x];
}
}
// Clear the last line
for (uint16_t x = 0; x < VGA_WIDTH; x++) {
vga_buffer[(VGA_HEIGHT - 1) * VGA_WIDTH + x] = vga_entry(' ', WHITE_ON_BLACK);
}
cursor_y = VGA_HEIGHT - 1;
}
}
void terminal_write(const char* str) {
for (size_t i = 0; str[i] != '\0'; i++) {
terminal_putchar(str[i]);
}
}

11
kernel/terminal.h Normal file
View File

@ -0,0 +1,11 @@
#ifndef TERMINAL_H
#define TERMINAL_H
#include <stdint.h>
void terminal_initialize(void);
void terminal_putchar(char c);
void terminal_write(const char *str);
void terminal_setcolor(uint8_t color);
#endif

View File

@ -1,34 +0,0 @@
#ifndef __CLASSIC_OS_KSTDC_STDBOOL_H__
#define __CLASSIC_OS_KSTDC_STDBOOL_H__ 1
#ifndef __cplusplus
#undef bool
#ifdef _Bool
#define bool _Bool
#undef true
#define true 1
#undef false
#define false 0
#else
typedef enum bool_t
{
false,
true,
} bool;
#endif
#endif
#ifdef __bool_true_false_are_defined
#undef __bool_true_false_are_defined
#endif
#define __bool_true_false_are_defined 1
#endif // __CLASSIC_OS_KSTDC_STDBOOL_H__

View File

@ -1,32 +0,0 @@
#ifndef __CLASSIC_OS_KSTDC_STDDEF_H__
#define __CLASSIC_OS_KSTDC_STDDEF_H__ 1
typedef long unsigned int size_t;
typedef long int ptrdiff_t;
#ifndef __cplusplus
typedef int wchar_t;
#endif
#ifdef __cplusplus
typedef decltype(nullptr) nullptr_t;
#endif
#ifndef __cplusplus
#define NULL ((void *)0)
#else
#define NULL 0
#endif
#undef offsetof
#define offsetof(s, m) __builtin_offsetof(s, m)
#endif // __CLASSIC_OS_KSTDC_STDDEF_H__

View File

@ -1,120 +0,0 @@
#ifndef __CLASSIC_OS_KSTDC_STDINT_H__
#define __CLASSIC_OS_KSTDC_STDINT_H__ 1
typedef unsigned char uint8_t;
typedef short unsigned int uint16_t;
typedef unsigned int uint32_t;
typedef long unsigned int uint64_t;
typedef unsigned char uint_least8_t;
typedef short unsigned int uint_least16_t;
typedef unsigned int uint_least32_t;
typedef long unsigned int uint_least64_t;
typedef unsigned char uint_fast8_t;
typedef long unsigned int uint_fast16_t;
typedef long unsigned int uint_fast32_t;
typedef long unsigned int uint_fast64_t;
typedef signed char int8_t;
typedef short int int16_t;
typedef int int32_t;
typedef long int int64_t;
typedef signed char int_least8_t;
typedef short int int_least16_t;
typedef int int_least32_t;
typedef long int int_least64_t;
typedef signed char int_fast8_t;
typedef long int int_fast16_t;
typedef long int int_fast32_t;
typedef long int int_fast64_t;
typedef long unsigned int uintptr_t;
typedef long int intptr_t;
typedef long unsigned int uintmax_t;
typedef long int intmax_t;
#define INT8_C(x) ((int8_t)(x))
#define INT16_C(x) ((int16_t)(x))
#define INT32_C(x) ((int32_t)(x))
#define INT64_C(x) ((int64_t)(x))
#define UINT8_C(x) ((uint8_t)(x))
#define UINT16_C(x) ((uint16_t)(x))
#define UINT32_C(x) ((uint32_t)(x))
#define UINT64_C(x) ((uint64_t)(x))
#define INTMAX_C(x) ((intmax_t)(x))
#define UINTMAX_C(x) ((uintmax_t)(x))
#define UINT8_MAX 0xff
#define UINT16_MAX 0xffff
#define UINT32_MAX 0xffffffffU
#define UINT64_MAX 0xffffffffffffffffUL
#define INT8_MAX 0x7f
#define INT16_MAX 0x7fff
#define INT32_MAX 0x7fffffff
#define INT64_MAX 0x7fffffffffffffffL
#define INT8_MIN (-INT8_MAX - 1)
#define INT16_MIN (-INT16_MAX - 1)
#define INT32_MIN (-INT32_MAX - 1)
#define INT64_MIN (-INT64_MAX - 1)
#define UINT_LEAST8_MAX 0xff
#define UINT_LEAST16_MAX 0xffff
#define UINT_LEAST32_MAX 0xffffffffU
#define UINT_LEAST64_MAX 0xffffffffffffffffUL
#define INT_LEAST8_MAX 0x7f
#define INT_LEAST16_MAX 0x7fff
#define INT_LEAST32_MAX 0x7fffffff
#define INT_LEAST64_MAX 0x7fffffffffffffffL
#define INT_LEAST8_MIN (-INT_LEAST8_MAX - 1)
#define INT_LEAST16_MIN (-INT_LEAST16_MAX - 1)
#define INT_LEAST32_MIN (-INT_LEAST32_MAX - 1)
#define INT_LEAST64_MIN (-INT_LEAST64_MAX - 1)
#define UINT_FAST8_MAX 0xff
#define UINT_FAST16_MAX 0xffffffffffffffffUL
#define UINT_FAST32_MAX 0xffffffffffffffffUL
#define UINT_FAST64_MAX 0xffffffffffffffffUL
#define INT_FAST8_MAX 0x7f
#define INT_FAST16_MAX 0x7fffffffffffffffL
#define INT_FAST32_MAX 0x7fffffffffffffffL
#define INT_FAST64_MAX 0x7fffffffffffffffL
#define INT_FAST8_MIN (-INT_FAST8_MAX - 1)
#define INT_FAST16_MIN (-INT_FAST16_MAX - 1)
#define INT_FAST32_MIN (-INT_FAST32_MAX - 1)
#define INT_FAST64_MIN (-INT_FAST64_MAX - 1)
#define UINTPTR_MAX 0xffffffffffffffffUL
#define INTPTR_MAX 0x7fffffffffffffffL
#define INTPTR_MIN (-INTPTR_MAX - 1)
#define UINTMAX_MAX 0xffffffffffffffffUL
#define INTMAX_MAX 0x7fffffffffffffffL
#define INTMAX_MIN (-INTMAX_MAX - 1)
#define PTRDIFF_MAX 0x7fffffffffffffffL
#define PTRDIFF_MIN (-PTRDIFF_MAX - 1)
#define SIG_ATOMIC_MAX 0x7fffffff
#define SIG_ATOMIC_MIN (-SIG_ATOMIC_MAX - 1)
#define SIZE_MAX 0xffffffffffffffffUL
#define WCHAR_MAX 0x7fffffff
#define WCHAR_MIN (-WCHAR_MAX - 1)
#define WINT_MAX 0xffffffffU
#define WINT_MIN (-WINT_MAX - 1)
#endif // __CLASSIC_OS_KSTDC_STDINT_H__

View File

@ -1,26 +0,0 @@
ENTRY(boot)
OUTPUT_FORMAT("binary")
SECTIONS {
. = 0x7c00;
.text :
{
*(.boot)
*(.text)
}
.rodata :
{
*(.rodata)
}
.data :
{
*(.data)
}
.bss :
{
*(.bss)
}
}