Initial commit

Author: Arun007coder

.gitignore

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+.vscode
+.vscode/*

docs/Readme.md

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+# SectorOS RE2
+
+Second rewrite of the SectorOS project. Written in C and assembly.
+
+## Features
+
+* Fully functional printf and sprintf
+* Interrupt and exception handling
+* string stdlib
+* Vga color changing
+* IDT and GDT functional
+
+## TODO
+
+* Implement driver for serial port, keyboard, mouse and other devices
+* Implement VFS
+* Implement memory management
+* Implement paging
+* etc...
+
+## Build
+
+To build the project, run the following command:
+```bash
+make -f src/Makefile
+```
+
+To build an ISO image, run the following command:
+```bash
+make -f src/Makefile iso
+```
+
+To run the project, run the following command:
+```bash
+make -f src/Makefile run
+```

docs/bochsrc

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+megs: 32
+romimage: file=/usr/share/bochs/BIOS-bochs-latest, address=0xf0000
+vgaromimage: /usr/share/bochs/VGABIOS-elpin-2.40
+floppya: 1_44=/dev/loop0, status=inserted
+boot: a
+log: bochsout.txt
+mouse: enabled=0
+clock: sync=realtime
+cpu: ips=500000

src/Include/gdt.h

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+#ifndef __GDT_H
+#define __GDT_H
+
+#include "system.h"
+
+typedef struct gdt_entry
+{
+    uint16_t limit_low;
+    uint16_t base_low;
+    uint8_t base_middle;
+    uint8_t access;
+    uint8_t granularity;
+    uint8_t base_high;
+} __attribute__((packed)) gdt_entry_t;
+
+typedef struct gdt_ptr
+{
+    uint16_t limit;
+    uint32_t base;
+}__attribute__((packed)) gdt_ptr_t;
+
+void init_gdt();
+void gdt_set_gate(int32_t num, uint32_t base, uint32_t limit, uint8_t access, uint8_t gran);
+
+#endif

src/Include/idt.h

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+#ifndef __IDT_H__
+#define __IDT_H__
+
+#include "system.h"
+#include "printf.h"
+#include "isr.h"
+
+typedef struct {
+    uint16_t offset_low;
+    uint16_t selector;
+    uint8_t  always0;
+    uint8_t  flags;
+    uint16_t offset_high;
+} __attribute__((packed)) idt_entry_t;
+
+typedef struct {
+    uint16_t limit;
+    uint32_t base;
+} __attribute__((packed)) idt_ptr_t;
+
+
+void init_idt();
+void idt_set_gate(uint8_t num, uint32_t base, uint16_t selector, uint8_t flags);
+
+#endif

src/Include/isr.h

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+#ifndef __ISR_H
+#define __ISR_H
+
+#include "system.h"
+
+typedef void (*isr_t)(registers_t *);
+extern isr_t interrupt_handlers[256];
+
+void register_interrupt_handler(int num, isr_t handler);
+
+
+// Pointer to the Interrupts in idt_helper.asm
+extern void exception0();     // 0x00: Exception 0: Divide Error
+extern void exception1();     // 0x01: Exception 1: Debug
+extern void exception2();     // 0x02: Exception 2: Non Maskable Interrupt
+extern void exception3();     // 0x03: Exception 3: Breakpoint
+extern void exception4();     // 0x04: Exception 4: Overflow
+extern void exception5();     // 0x05: Exception 5: Bound Range Exceeded
+extern void exception6();     // 0x06: Exception 6: Invalid Opcode
+extern void exception7();     // 0x07: Exception 7: Device Not Available
+extern void exception8();     // 0x08: Exception 8: Double Fault
+extern void exception9();     // 0x09: Exception 9: Coprocessor Segment Overrun [386][GPF]
+extern void exception10();    // 0x0A: Exception 10: Invalid TSS
+extern void exception11();    // 0x0B: Exception 11: Segment Not Present
+extern void exception12();    // 0x0C: Exception 12: Stack Fault
+extern void exception13();    // 0x0D: Exception 13: General Protection Fault
+extern void exception14();    // 0x0E: Exception 14: Page Fault
+extern void exception15();    // 0x0F: Exception 15: Reserved
+extern void exception16();    // 0x10: Exception 16: x87 FPU Floating-Point Error
+extern void exception17();    // 0x11: Exception 17: Alignment Check
+extern void exception18();    // 0x12: Exception 18: Machine Check
+extern void exception19();    // 0x13: Exception 19: SIMD Floating-Point Exception
+extern void exception20();    // 0x14: Exception 20: Virtualization Exception
+extern void exception21();    // 0x15: Exception 21: Control Protection Exception
+extern void exception22();    // 0x16: Exception 22: Security Exception
+extern void exception23();    // 0x17: Exception 23: Spare
+extern void exception24();    // 0x18: Exception 24: Spare
+extern void exception25();    // 0x19: Exception 25: Spare
+extern void exception26();    // 0x1A: Exception 26: Spare
+extern void exception27();    // 0x1B: Exception 27: Spare
+extern void exception28();    // 0x1C: Exception 28: Spare
+extern void exception29();    // 0x1D: Exception 29: Spare
+extern void exception30();    // 0x1E: Exception 30: Spare
+extern void exception31();    // 0x1F: Exception 31: Spare
+
+// Pointer to the Interrupts in idt_helper.asm
+extern void irq0();     // 0x20: IRQ 0: Programmable Interrupt Timer
+extern void irq1();     // 0x21: IRQ 1: Keyboard
+extern void irq2();     // 0x22: IRQ 2: Cascade (2)
+extern void irq3();     // 0x23: IRQ 3: Cascade (3)
+extern void irq4();     // 0x24: IRQ 4: Cascade (4)
+extern void irq5();     // 0x25: IRQ 5: Cascade (5)
+extern void irq6();     // 0x26: IRQ 6: Cascade (6)
+extern void irq7();     // 0x27: IRQ 7: Cascade (7)
+extern void irq8();     // 0x28: IRQ 8: Cascade (8)
+extern void irq9();     // 0x29: IRQ 9: Cascade (9)
+extern void irq10();    // 0x2A: IRQ 10: Cascade (10)
+extern void irq11();    // 0x2B: IRQ 11: Cascade (11)
+extern void irq12();    // 0x2C: IRQ 12: Cascade (12)
+extern void irq13();    // 0x2D: IRQ 13: Cascade (13)
+extern void irq14();    // 0x2E: IRQ 14: Cascade (14)
+extern void irq15();    // 0x2F: IRQ 15: Cascade (15)
+
+
+#endif