im so mad

Makefile

@@ -1,7 +1,7 @@
 CC = i686-elf-gcc
 INCLUDE = -I./
 CFLAGS = -Wall -Wextra -Werror -ffreestanding $(INCLUDE)
-LDFLAGS = -T kernel.ld -ffreestanding -O3 -nostdlib -lgcc -mpreferred-stack-boundary=4
+LDFLAGS = -T kernel.ld -ffreestanding -O3 -nostdlib -lgcc
 
 BUILDDIR = build
 
@@ -21,7 +21,7 @@ KERNELIMG := $(BUILDDIR)/kernel.bin
 QEMUFLAGS = -d int -s \
 			-kernel $(KERNELIMG) \
 			-machine q35 \
-			-device piix3-ide,id=ide -drive id=disk,file=image.img,format=raw,if=none -device ide-hd,drive=disk,bus=ide.0
+			-device piix3-ide,id=ide -drive id=disk,file=image.img,format=raw,if=none -device ide-hd,drive=disk,bus=ide.0 \
 
 .PHONY: all kernel qemu clean docs
 
@@ -44,6 +44,8 @@ qemu: kernel
 iso: kernel
 	cp $(BUILDDIR)/kernel.bin iso/boot/kernel.bin
 	grub-mkrescue -o  $(BUILDDIR)/andewOS.iso iso/
+bochs: iso
+	bochs -q
 
 clean:
 	rm -rf build/*.o build/*.bin iso/boot/*.bin

acpi.c

@@ -1,6 +1,7 @@
 #include <acpi.h>
+#include <strcmp.h>
 
-struct rsdp *acpi_search_for_rsdp() {
+struct rsdp *acpi_locate_rsdp() {
     char *ptr = (char *)BIOS_START;
     char *str = RSDP_SIG;
 
@@ -37,3 +38,20 @@ int acpi_validate_sdt_checksum(struct ACPISDTHeader *s) {
 
     return sum == 0;
 }
+
+void *acpi_locate_sdt(struct rsdt *rsdt, const char sig[4]) {
+    int entries = (rsdt->h.Length - sizeof(rsdt->h)) / 4;
+ 
+    for (int i = 0; i < entries; i++)
+    {
+        struct ACPISDTHeader *h = (struct ACPISDTHeader *) rsdt->other_sdt[i];
+        if (!strncmp(h->Signature, sig, 4)) {
+            if (acpi_validate_sdt_checksum(h))
+                return (void *) h;
+            else 
+                return 0;
+        }
+    }
+ 
+    return 0;
+}

acpi.h

@@ -51,9 +51,86 @@ struct mcfg {
     struct mcfg_entry entries[];
 };
 
-struct rsdp *acpi_search_for_rsdp();
+struct GenericAddressStructure
+{
+    uint8_t AddressSpace;
+    uint8_t BitWidth;
+    uint8_t BitOffset;
+    uint8_t AccessSize;
+    uint64_t Address;
+};
+
+struct fadt {
+    struct   ACPISDTHeader h;
+    uint32_t FirmwareCtrl;
+    uint32_t Dsdt;
+ 
+    // field used in ACPI 1.0; no longer in use, for compatibility only
+    uint8_t  Reserved;
+ 
+    uint8_t  PreferredPowerManagementProfile;
+    uint16_t SCI_Interrupt;
+    uint32_t SMI_CommandPort;
+    uint8_t  AcpiEnable;
+    uint8_t  AcpiDisable;
+    uint8_t  S4BIOS_REQ;
+    uint8_t  PSTATE_Control;
+    uint32_t PM1aEventBlock;
+    uint32_t PM1bEventBlock;
+    uint32_t PM1aControlBlock;
+    uint32_t PM1bControlBlock;
+    uint32_t PM2ControlBlock;
+    uint32_t PMTimerBlock;
+    uint32_t GPE0Block;
+    uint32_t GPE1Block;
+    uint8_t  PM1EventLength;
+    uint8_t  PM1ControlLength;
+    uint8_t  PM2ControlLength;
+    uint8_t  PMTimerLength;
+    uint8_t  GPE0Length;
+    uint8_t  GPE1Length;
+    uint8_t  GPE1Base;
+    uint8_t  CStateControl;
+    uint16_t WorstC2Latency;
+    uint16_t WorstC3Latency;
+    uint16_t FlushSize;
+    uint16_t FlushStride;
+    uint8_t  DutyOffset;
+    uint8_t  DutyWidth;
+    uint8_t  DayAlarm;
+    uint8_t  MonthAlarm;
+    uint8_t  Century;
+ 
+    // reserved in ACPI 1.0; used since ACPI 2.0+
+    uint16_t BootArchitectureFlags;
+ 
+    uint8_t  Reserved2;
+    uint32_t Flags;
+ 
+    // 12 byte structure; see below for details
+    struct GenericAddressStructure ResetReg;
+ 
+    uint8_t  ResetValue;
+    uint8_t  Reserved3[3];
+ 
+    // 64bit pointers - Available on ACPI 2.0+
+    uint64_t                X_FirmwareControl;
+    uint64_t                X_Dsdt;
+ 
+    struct GenericAddressStructure X_PM1aEventBlock;
+    struct GenericAddressStructure X_PM1bEventBlock;
+    struct GenericAddressStructure X_PM1aControlBlock;
+    struct GenericAddressStructure X_PM1bControlBlock;
+    struct GenericAddressStructure X_PM2ControlBlock;
+    struct GenericAddressStructure X_PMTimerBlock;
+    struct GenericAddressStructure X_GPE0Block;
+    struct GenericAddressStructure X_GPE1Block;
+};
+
+struct rsdp *acpi_locate_rsdp();
 int acpi_validate_rsdp_checksum(struct rsdp *s);
 int acpi_validate_sdt_checksum(struct ACPISDTHeader *s);
 struct ACPISDTHeader *acpi_find_table(struct rsdt *root, const char *signature);
+void *acpi_locate_sdt(struct rsdt *rsdt, const char sig[4]);
 
 #endif

bochsrc

@@ -0,0 +1,3 @@
+ata0-slave: type=cdrom, path=./build/andewOS.iso, status=inserted
+magic_break: enabled=1
+boot: cdrom

gdt.h

@@ -0,0 +1,9 @@
+#ifndef GDT_H_
+#define GDT_H_
+
+#define GDT_NULL 0
+#define GDT_KERNEL_CODE 1
+#define GDT_KERNEL_DATA 2
+#define GDT_SEGMENT_SELECTOR(i, p) ((i << 3) | p)
+
+#endif

ide.h

@@ -0,0 +1,15 @@
+#ifndef IDE_H_
+#define IDE_H_
+
+enum IDE_MODE {
+    ISA_ONLY                             = 0x00,
+    PCI_ONLY                             = 0x05,
+    ISA_CAN_SWITCH                       = 0x0a,
+    PCI_CAN_SWITCH                       = 0x0f,
+    ISA_ONLY_BUS_MASTERING               = 0x80,
+    PCI_ONLY_BUS_MASTERING               = 0x85,
+    ISA_CAN_SWITCH_BUS_MASTERING         = 0x8a,
+    PCI_CAN_SWITCH_BUS_MASTERING         = 0x8f,
+};
+
+#endif

idt.c

@@ -0,0 +1,9 @@
+#include <idt.h>
+
+void encode_idt_entry(struct idt_entry idt[], int i, uint32_t offset, uint16_t segment_selector, uint8_t attributes) {
+   idt[i].offset_lo = (uint16_t)(offset & 0xFFFF);
+   idt[i].seg_select = segment_selector;
+   idt[i].reserved = 0;
+   idt[i].attributes = attributes;
+   idt[i].offset_hi = (uint16_t)(offset >> 16);
+}

idt.h

@@ -0,0 +1,42 @@
+#ifndef ANDEWOS_IDT_H_
+#define ANDEWOS_IDT_H_
+
+#include <stdint.h>
+
+#define GDT_SEGMENT_SELECTOR(i, p) ((i << 3) | p)
+#define LDT_SEGMENT_SELECTOR(i, p) ((i << 3) | 0x04 | p)
+
+#define IDT_ENTRY_COUNT 256
+
+struct idt_entry {
+   uint16_t offset_lo; 
+   uint16_t seg_select;
+   uint8_t  reserved;
+   uint8_t  attributes;
+   uint16_t offset_hi;
+} __attribute__ ((packed));
+
+struct idtr {
+    uint16_t size;
+    uint32_t base;
+} __attribute__ ((packed));
+
+enum IDT_ATTRIBUTES {
+    TASK_GATE    = 0x05,
+    INT_GATE_16  = 0x06,
+    TRAP_GATE_16 = 0x07,
+    INT_GATE_32  = 0x0E,
+    TRAP_GATE_32 = 0x0F,
+
+    INT_RING0 = 0x00,
+    INT_RING1 = 0x20,
+    INT_RING2 = 0x40,
+    INT_RING3 = 0x60,
+
+    INT_PRESENT = 0x80,
+};
+
+void encode_idt_entry(struct idt_entry idt[], int i, uint32_t offset, uint16_t segment_selector, uint8_t attributes);
+void flush_idt(uint32_t idt_pointer);
+
+#endif

iso/boot/grub/grub.cfg

@@ -0,0 +1,5 @@
+default=0
+timeout=0
+menuentry "andewOS" {
+    multiboot /boot/kernel.bin
+}

kmain.c

@@ -1,8 +1,13 @@
 #include <multiboot.h>
 #include <acpi.h>
 #include <vga.h>
+#include <pci.h>
 #include <printf.h>
 #include <strcmp.h>
+#include <gdt.h>
+#include <idt.h>
+#include <pic8259.h>
+#include <ps2.h>
 
 struct kernel_context {
     struct rsdp *rsdp;
@@ -13,58 +18,30 @@ struct kernel_context {
 
 struct kernel_context ctx = {0};
 
+struct idt_entry g_idt[256] = {0};
+struct idtr g_idtr = {0};
 
-void *acpi_find_sdt(void *RootSDT, const char sig[4]) {
-    struct rsdt *rsdt = (struct rsdt *) RootSDT;
-    int entries = (rsdt->h.Length - sizeof(rsdt->h)) / 4;
+extern void exception_handler();
+extern void ps2_isr();
 
-    for (int i = 0; i < entries; i++)
-    {
-        struct ACPISDTHeader *h = (struct ACPISDTHeader *) rsdt->other_sdt[i];
-        if (!strncmp(h->Signature, sig, 4))
-            return (void *) h;
-    }
- 
-    return 0;
-}
-
-uint16_t readw(uint32_t addr, uint32_t offset, uint8_t bus, uint8_t slot, uint8_t func) {
-    uint32_t lbus  = (uint32_t)bus;
-    uint32_t lslot = (uint32_t)slot;
-    uint32_t lfunc = (uint32_t)func;
-
-    uint32_t address = addr + offset + ((lbus) << 20 | lslot << 15 | lfunc << 12);
- 
-    return *(uint16_t *)address;
-}
-
-uint8_t readb(uint32_t addr, uint32_t offset, uint8_t bus, uint8_t slot, uint8_t func) {
-    uint32_t lbus  = (uint32_t)bus;
-    uint32_t lslot = (uint32_t)slot;
-    uint32_t lfunc = (uint32_t)func;
-
-    uint32_t address = addr + offset + ((lbus) << 20 | lslot << 15 | lfunc << 12);
- 
-    return *(uint8_t *)address;
-}
-
-uint32_t readd(uint32_t addr, uint32_t offset, uint8_t bus, uint8_t slot, uint8_t func) {
-    uint32_t lbus  = (uint32_t)bus;
-    uint32_t lslot = (uint32_t)slot;
-    uint32_t lfunc = (uint32_t)func;
-
-    uint32_t address = addr + offset + ((lbus) << 20 | lslot << 15 | lfunc << 12);
- 
-    return *(uint32_t *)address;
-}
+#define MAGIC_BREAKPOINT __asm__ volatile("xchgw %bx, %bx");
 
 void kmain(struct multiboot_info *info) {
     clear_screen();
-
 // Check if the bootloader gave us the upper and lower memory
     if (!(info->flags & 0x1)) goto halt;
 
-    struct rsdp *found_rsdp = acpi_search_for_rsdp();
+// Create and load an IDT
+    for (int i = 0; i < 32; i++) {
+        encode_idt_entry(g_idt, i, (uint32_t)&exception_handler, GDT_SEGMENT_SELECTOR(GDT_KERNEL_CODE, 0x00), TRAP_GATE_32 | INT_RING0 | INT_PRESENT);
+    }
+
+    g_idtr.size = (sizeof(struct idt_entry) * 256) - 1;
+    g_idtr.base = (uint32_t) &g_idt;
+
+    asm volatile ("lidt %0" :: "m"(g_idtr));
+
+    struct rsdp *found_rsdp = acpi_locate_rsdp();
     if (!found_rsdp) {
         printf("Failed to find RSDP signature\n");
         goto halt;
@@ -73,7 +50,6 @@ void kmain(struct multiboot_info *info) {
     printf("RSDP detected at 0x%X\n", found_rsdp);
 
     if (found_rsdp->Revision == ACPI_VER_1) {
-        // ACPI v1.0 is being used
         if (!acpi_validate_rsdp_checksum(found_rsdp)) {
             printf("RSDP has an invalid checksum\n");
             goto halt;
@@ -100,26 +76,30 @@ void kmain(struct multiboot_info *info) {
 
     printf("Using ACPI v1.0\n");
 
-    struct mcfg *mcfg = acpi_find_sdt(ctx.rsdt, "MCFG");
-    if (!mcfg) {
-        printf("Failed to find MCFG\n");
+    struct fadt *fadt = acpi_locate_sdt(ctx.rsdt, "FACP");
+    if (!fadt) {
+        printf("Failed to find FADT\n");
         goto halt;
     }
+    printf("Found FADT at 0x%x\n", fadt);
+    if (fadt->Flags & 1)
+        printf("Legacy devices are supported.\n");
+    pic_remap(PIC_1_START, PIC_2_START);
+// ACPI version 1.0 is so old that we assume that our PC supports the 8042 ps/2 controller 
+    initialize_8042ps2();
+    encode_idt_entry(g_idt, 0x21, (uint32_t)&ps2_isr, GDT_SEGMENT_SELECTOR(GDT_KERNEL_CODE, 0x00), INT_GATE_32 | INT_RING0 | INT_PRESENT);
+    asm volatile ("sti" ::);
 
-    printf("Detected MCFG at 0x%X\n", mcfg);
-    int entries = (mcfg->h.Length - 44) / 16;
-    for (int i = 0; i < entries; i++) {
-        uint32_t addr = (uint32_t)mcfg->entries[i].base_addr;
-        for (int j = 0; j < 256; j++) {
-            for (int k = 0; k < 8; k++) {
-                uint32_t word = readd(addr, 8, i, j, k);
-                if (word != 0xFFFFFFFF && word) {
-                    printf("%08X\n", word >> 8);
-                }
-            }
-        }
-    }
+    struct mcfg *mcfg = acpi_locate_sdt(ctx.rsdt, "MCFG");
+    if (!mcfg) {
+        printf("failed to find mcfg\n");
+    } else {
 
+        printf("Found MCFG at 0x%x\n", mcfg);
+
+        struct pci_config_space *ide = pcie_find_device(mcfg, MASS_STORAGE_CONTROLLER, IDE_INTERFACE);
+        if (ide) printf("IDE controller detected. Program Interface: %X\n", ide->program_interface);
+    }
 halt:
     for (;;) {}
 }

multiboot.asm

@@ -28,6 +28,7 @@ _start:
     jmp 0x8:.use_code_seg ; Offset to kernel code descriptor
 .use_code_seg:
     mov esp, stack_bottom
+    mov ebp, esp
     push ebx 
     extern kmain
     call kmain
@@ -37,6 +38,19 @@ _start:
 halt:
     hlt
     jmp halt
+global exception_handler
+exception_handler:
+    add esp, 4
+    mov byte [0xb8000], 'X'
+    iret
+global ps2_isr
+ps2_isr:
+    extern ps2_handler
+    pushad
+    cld
+    call ps2_handler
+    popad
+    iret
 
 ; GDT for a flat memory layout
 ; We get access to all memory and can utilize paging
@@ -63,9 +77,10 @@ gdtp:
     dw gdt_end - gdt_start - 1
     dd gdt_start
 
+
 ; Reserve 16KiB of kernel stack space
 section .bss
-align 4
+align 16
 stack_top:
     resb 16384 
 stack_bottom:

pci.c

@@ -0,0 +1,18 @@
+#include <pci.h>
+
+struct pci_config_space *pcie_find_device(struct mcfg *mcfg, uint8_t class, uint8_t subclass) {
+    int entries = (mcfg->h.Length - 44) / 16;
+    for (int i = 0; i < entries; i++) {
+        uint32_t addr = (uint32_t)mcfg->entries[i].base_addr;
+        for (int j = 0; j < 256; j++) {
+            for (int k = 0; k < 8; k++) {
+                struct pci_config_space *cfg = (struct pci_config_space *)PCI_ADDR(addr, i, j, k);
+                if (cfg->class == class && cfg->subclass == subclass) {
+                   return cfg; 
+                }
+            }
+        }
+    }
+
+    return 0;
+}

pci.h

@@ -0,0 +1,56 @@
+#ifndef PCI_H_
+#define PCI_H_
+
+#include <stdint.h>
+#include <acpi.h>
+
+#define PCI_ADDR(addr, bus, device, func) (addr + ((bus) << 20 | device << 15 | func << 12))
+
+enum PCI_CLASS {
+    UNCLASSIFIED,
+    MASS_STORAGE_CONTROLLER,
+    NETWORK_CONTROLLER,
+    DISPLAY_CONTROLLER,
+    MULTIMEDIA_CONTROLLER,
+    MEMORY_CONTROLLER,
+    BRIDGE,
+    COMMUNICATION_CONTROLLER,
+    GENERIC_SYSTEM_PERIPHERAL,
+    INPUT_DEVICE_CONTROLLER,
+    DOCKING_STATION,
+    PROCESSOR,
+    SERIAL_BUS_CONTROLLER,
+    WIRELESS_CONTROLLER,
+    INTELLIGENT_CONTROLLER,
+    SATELLITE_COMMUNICATIONS_CONTROLLER,
+    ENCRYPTION_CONTROLLER,
+    SIGNAL_PROCESSING_CONTROLLER,
+    PROCESSING_ACCELERATORS,
+};
+
+enum PCI_STORAGE_SUBCLASS {
+    SCSI_STORAGE_CONTROLLER,
+    IDE_INTERFACE,
+    FLOPPY_DISK_CONTROLLER,
+    IPI_BUS_CONTROLLER,
+    RAID_BUS_CONTROLLER,
+    ATA_CONTROLLER,
+    SATA_CONTROLLER,
+};
+
+struct pci_config_space {
+    uint16_t vendor_id; 
+    uint16_t device_id; 
+    uint16_t command;
+    uint16_t status;
+    uint8_t revision_id;
+    uint8_t program_interface;
+    uint8_t subclass;
+    uint8_t class;
+};
+
+// TODO: Bruteforce all devices once then store all valid devices in memory rather than bruteforcing every time to search
+// TODO: Returning multiple devices
+struct pci_config_space *pcie_find_device(struct mcfg *mcfg, uint8_t class, uint8_t subclass);
+
+#endif

pic8259.c

@@ -0,0 +1,30 @@
+#include <pic8259.h>
+
+void pic_send_eoi(uint8_t irq) {
+    if (irq > 7)
+        outportb(PIC_2_COMMAND, PIC_EOI);
+    else
+        outportb(PIC_1_COMMAND, PIC_EOI);
+}
+
+void pic_remap(int pic1_start, int pic2_start) {
+    // Mask all IRQ lines
+    outportb(PIC_1_DATA, 0xff);
+    outportb(PIC_2_DATA, 0xff);
+
+    // Initialize master PIC
+    outportb(PIC_1_COMMAND, ICW4_NEEDED | INIT_BIT);
+    outportb(PIC_1_DATA, pic1_start);
+    outportb(PIC_1_DATA, PIC_1_ICW3);
+    outportb(PIC_1_DATA, 0x01);
+
+    // Initialize slave PIC
+    outportb(PIC_2_COMMAND, ICW4_NEEDED | INIT_BIT);
+    outportb(PIC_2_DATA, pic2_start);
+    outportb(PIC_2_DATA, PIC_2_ICW3);
+    outportb(PIC_2_DATA, 0x01);
+
+    // Unmask
+    outportb(PIC_1_DATA, 0b11111101);
+    outportb(PIC_2_DATA, 0b11111101);
+}

pic8259.h

@@ -0,0 +1,30 @@
+#ifndef ANDEWOS_PIC8259_H
+#define ANDEWOS_PIC8259_H
+
+#define PIC_1_COMMAND 0x20
+#define PIC_2_COMMAND 0xA0
+#define PIC_1_DATA    0x21
+#define PIC_2_DATA    0xA1
+
+#define PIC_EOI 0x20
+
+#define PIC_1_START 32
+#define PIC_2_START  40
+
+#define PIC_1_ICW3 0x04
+#define PIC_2_ICW3 0x02 
+
+#include <io.h>
+
+enum ICW1 {
+    ICW4_NEEDED = 0x01,
+    SINGLE_MODE = 0x02,
+    INTERVAL_4  = 0x04,
+    LVL_TRIGGER = 0x08,
+    INIT_BIT    = 0x10,
+};
+
+void pic_send_eoi(uint8_t irq);
+void pic_remap(int pic1_start, int pic2_start);
+
+#endif

printf.c

@@ -866,6 +866,7 @@ int printf_(const char* format, ...)
   char buffer[1];
   const int ret = _vsnprintf(_out_char, buffer, (size_t)-1, format, va);
   va_end(va);
+  
   return ret;
 }
 

printf.h

@@ -32,10 +32,6 @@
 #ifndef _PRINTF_H_
 #define _PRINTF_H_
 
-#define PRINTF_DISABLE_SUPPORT_FLOAT
-#define PRINTF_DISABLE_SUPPORT_EXPONENTIAL
-#define PRINTF_DISABLE_SUPPORT_LONG_LONG
-
 #include <stdarg.h>
 #include <stddef.h>
 
@@ -62,6 +58,7 @@ void _putchar(char character);
  * \return The number of characters that are written into the array, not counting the terminating null character
  */
 #define printf printf_
+//int printf_(const char* format, ...);
 int printf_(const char* format, ...);
 
 

ps2.c

@@ -0,0 +1,432 @@
+#include <ps2.h>
+#include <io.h>
+#include <pic8259.h>
+#include <vga.h>
+#include <printf.h>
+#include <strcmp.h>
+
+#define cpu_relax asm volatile ("pause" ::);
+
+char shell_buffer[512];
+int shell_index;
+
+// TODO: Support dual ports
+void initialize_8042ps2() {
+    // disable ps/2 ports so nothing gets messed up
+    outportb(PS2_8042_COMMAND, 0xAD);
+    outportb(PS2_8042_COMMAND, 0xA7);
+
+    // flush output buffer
+    inportb(PS2_8042_DATA);
+
+    // get config byte
+    outportb(PS2_8042_COMMAND, 0x20);
+    uint8_t config = inportb(0x60);
+    // disable IRQs and translation, also make sure 0 vals are 0
+    config &= 0b00110100;
+    // write our config byte back
+    outportb(PS2_8042_COMMAND, 0x60);
+    while (inportb(PS2_8042_STATUS) & 0x2) cpu_relax;
+    outportb(PS2_8042_DATA, config);
+
+    // perform self test
+    outportb(PS2_8042_COMMAND, 0xAA);
+    while (!(inportb(PS2_8042_STATUS) & 0x1)) cpu_relax;
+    uint8_t result = inportb(PS2_8042_DATA);
+    if (result == 0x55) printf("Passed PS/2 self test!\n");
+    else printf("Failed!\n");
+
+    // perform port test
+    outportb(PS2_8042_COMMAND, 0xAB);
+    while (!(inportb(PS2_8042_STATUS) & 0x1)) cpu_relax;
+    result = inportb(PS2_8042_DATA);
+    if (!result) printf("Passed PS/2 port 1 test!!\n");
+    else printf("Failed!\n");
+
+    // enable ps/2 port
+    outportb(PS2_8042_COMMAND, 0xAE);
+
+    // enable IRQ 1
+    config = 0b01100101;
+    outportb(PS2_8042_COMMAND, 0x60);
+    while (inportb(PS2_8042_STATUS) & 0x2) cpu_relax;
+    outportb(PS2_8042_DATA, config);
+}
+
+void ps2_handler() {
+    uint8_t scancode = inportb(0x60);
+
+    if (scancode > 0x80) goto eoi;
+
+    switch(scancode) {
+        case KBD_ESC:
+            break;
+        case KBD_1:
+            _putchar('1');
+            shell_buffer[shell_index++] = '1';
+            break;
+        case KBD_2:
+            _putchar('2');
+            shell_buffer[shell_index++] = '2';
+            break;
+        case KBD_3:
+            _putchar('3');
+            shell_buffer[shell_index++] = '3';
+            break;
+        case KBD_4:
+            _putchar('4');
+            shell_buffer[shell_index++] = '4';
+            break;
+        case KBD_5:
+            _putchar('5');
+            shell_buffer[shell_index++] = '5';
+            break;
+        case KBD_6:
+            _putchar('6');
+            shell_buffer[shell_index++] = '6';
+            break;
+        case KBD_7:
+            _putchar('7');
+            shell_buffer[shell_index++] = '7';
+            break;
+        case KBD_8:
+            _putchar('8');
+            shell_buffer[shell_index++] = '8';
+            break;
+        case KBD_9:
+            _putchar('9');
+            shell_buffer[shell_index++] = '9';
+            break;
+        case KBD_0:
+            _putchar('0');
+            shell_buffer[shell_index++] = '0';
+            break;
+        case KBD_MINUS:
+            _putchar('-');
+            shell_buffer[shell_index++] = '-';
+            break;
+        case KBD_EQUALS:
+            _putchar('=');
+            shell_buffer[shell_index++] = '=';
+            break;
+        case KBD_BACKSPACE:
+            if (shell_index > 0) {
+                popchar();
+                shell_buffer[--shell_index] = 0;
+            }
+            break;
+        case KBD_TAB:
+            break;
+        case KBD_Q:
+            _putchar('Q');
+            shell_buffer[shell_index++] = 'Q';
+            break;
+        case KBD_W:
+            _putchar('W');
+            shell_buffer[shell_index++] = 'W';
+            break;
+        case KBD_E:
+            _putchar('E');
+            shell_buffer[shell_index++] = 'E';
+            break;
+        case KBD_R:
+            _putchar('R');
+            shell_buffer[shell_index++] = 'R';
+            break;
+        case KBD_T:
+            _putchar('T');
+            shell_buffer[shell_index++] = 'T';
+            break;
+        case KBD_Y:
+            _putchar('Y');
+            shell_buffer[shell_index++] = 'Y';
+            break;
+        case KBD_U:
+            _putchar('U');
+            shell_buffer[shell_index++] = 'U';
+            break;
+        case KBD_I:
+            _putchar('I');
+            shell_buffer[shell_index++] = 'I';
+            break;
+        case KBD_O:
+            _putchar('O');
+            shell_buffer[shell_index++] = 'O';
+            break;
+        case KBD_P:
+            _putchar('P');
+            shell_buffer[shell_index++] = 'P';
+            break;
+        case KBD_LBRACKET:
+            _putchar('[');
+            shell_buffer[shell_index++] = '[';
+            break;
+        case KBD_RBRACKET:
+            _putchar(']');
+            shell_buffer[shell_index++] = ']';
+            break;
+        case KBD_ENTER:
+            printf("\n");
+            if (strcmp(shell_buffer, "PINGAS") == 0) {
+                printf("andew pingas detected");
+            } else if (strcmp(shell_buffer, "HELLO") == 0) {
+                printf("hi");
+            } else {
+                printf("unknown command '%s' idiot", shell_buffer);
+            }
+            for (int i = 0; i < 512; i++) {
+                shell_buffer[i] = 0;
+            }
+            shell_index = 0;
+            printf("\n$ ");
+            break;
+        case KBD_LCTRL:
+            // Handle left control key
+            break;
+        case KBD_A:
+            _putchar('A');
+            shell_buffer[shell_index++] = 'A';
+            break;
+        case KBD_S:
+            _putchar('S');
+            shell_buffer[shell_index++] = 'S';
+            break;
+        case KBD_D:
+            _putchar('D');
+            shell_buffer[shell_index++] = 'D';
+            break;
+        case KBD_F:
+            _putchar('F');
+            shell_buffer[shell_index++] = 'F';
+            break;
+        case KBD_G:
+            _putchar('G');
+            shell_buffer[shell_index++] = 'G';
+            break;
+        case KBD_H:
+            _putchar('H');
+            shell_buffer[shell_index++] = 'H';
+            break;
+        case KBD_J:
+            _putchar('J');
+            shell_buffer[shell_index++] = 'J';
+            break;
+        case KBD_K:
+            _putchar('K');
+            shell_buffer[shell_index++] = 'K';
+            break;
+        case KBD_L:
+            _putchar('L');
+            shell_buffer[shell_index++] = 'L';
+            break;
+        case KBD_SEMICOLON:
+            _putchar(';');
+            shell_buffer[shell_index++] = ';';
+            break;
+        case KBD_APOSTROPHE:
+            _putchar('\'');
+            shell_buffer[shell_index++] = '\'';
+            break;
+        case KBD_GRAVE:
+            _putchar('`');
+            shell_buffer[shell_index++] = '`';
+            break;
+        case KBD_LSHIFT:
+            // Handle left shift key
+            break;
+        case KBD_BACKSLASH:
+            _putchar('\\');
+            shell_buffer[shell_index++] = '\\';
+            break;
+        case KBD_Z:
+            _putchar('Z');
+            shell_buffer[shell_index++] = 'Z';
+            break;
+        case KBD_X:
+            _putchar('X');
+            shell_buffer[shell_index++] = 'X';
+            break;
+        case KBD_C:
+            _putchar('C');
+            shell_buffer[shell_index++] = 'C';
+            break;
+        case KBD_V:
+            _putchar('V');
+            shell_buffer[shell_index++] = 'V';
+            break;
+        case KBD_B:
+            _putchar('B');
+            shell_buffer[shell_index++] = 'B';
+            break;
+        case KBD_N:
+            _putchar('N');
+            shell_buffer[shell_index++] = 'N';
+            break;
+        case KBD_M:
+            _putchar('M');
+            shell_buffer[shell_index++] = 'M';
+            break;
+        case KBD_COMMA:
+            _putchar(',');
+            shell_buffer[shell_index++] = ',';
+            break;
+        case KBD_PERIOD:
+            _putchar('.');
+            shell_buffer[shell_index++] = '.';
+            break;
+        case KBD_SLASH:
+            _putchar('/');
+            shell_buffer[shell_index++] = '/';
+            break;
+        case KBD_RSHIFT:
+            // Handle right shift key
+            break;
+        case KBD_PRINTSCREEN:
+            // Handle print screen key
+            break;
+        case KBD_LALT:
+            // Handle left alt key
+            break;
+        case KBD_SPACE:
+            _putchar(' ');
+            shell_buffer[shell_index++] = ' ';
+            break;
+        case KBD_CAPSLOCK:
+            // Handle caps lock key
+            break;
+        case KBD_F1:
+            // Handle F1 key
+            break;
+        case KBD_F2:
+            // Handle F2 key
+            break;
+        case KBD_F3:
+            // Handle F3 key
+            break;
+        case KBD_F4:
+            // Handle F4 key
+            break;
+        case KBD_F5:
+            // Handle F5 key
+            break;
+        case KBD_F6:
+            // Handle F6 key
+            break;
+        case KBD_F7:
+            // Handle F7 key
+            break;
+        case KBD_F8:
+            // Handle F8 key
+            break;
+        case KBD_F9:
+            // Handle F9 key
+            break;
+        case KBD_F10:
+            // Handle F10 key
+            break;
+        case KBD_NUMLOCK:
+            // Handle num lock key
+            break;
+        case KBD_SCROLLLOCK:
+            // Handle scroll lock key
+            break;
+        case KBD_HOME:
+            // Handle home key
+            break;
+        case KBD_UP:
+            // Handle up arrow key
+            break;
+        case KBD_PAGEUP:
+            // Handle page up key
+            break;
+        case KBD_KP_MINUS:
+            // Handle keypad minus key
+            break;
+        case KBD_LEFT:
+            // Handle left arrow key
+            break;
+        case KBD_KP_5:
+            // Handle keypad 5 key
+            break;
+        case KBD_RIGHT:
+            // Handle right arrow key
+            break;
+        case KBD_KP_PLUS:
+            // Handle keypad plus key
+            break;
+        case KBD_END:
+            // Handle end key
+            break;
+        case KBD_DOWN:
+            // Handle down arrow key
+            break;
+        case KBD_PAGEDOWN:
+            // Handle page down key
+            break;
+        case KBD_INSERT:
+            // Handle insert key
+            break;
+        case KBD_DELETE:
+            // Handle delete key
+            break;
+        case KBD_SYSRQ:
+            // Handle system request key
+            break;
+        case KBD_F11:
+            // Handle F11 key
+            break;
+        case KBD_F12:
+            // Handle F12 key
+            break;
+        case KBD_KP_ENTER:
+            break;
+        case KBD_RCTRL:
+            // Handle right control key
+            break;
+        case KBD_KP_DIVIDE:
+            // Handle keypad divide key
+            break;
+        case KBD_PRINTSCREEN2:
+            // Handle print screen key (alternate)
+            break;
+        case KBD_RALT:
+            // Handle right alt key
+            break;
+        case KBD_HOME2:
+            // Handle home key (alternate)
+            break;
+        case KBD_UP2:
+            // Handle up arrow key (alternate)
+            break;
+        case KBD_PAGEUP2:
+            // Handle page up key (alternate)
+            break;
+        case KBD_LEFT2:
+            // Handle left arrow key (alternate)
+            break;
+        case KBD_RIGHT2:
+            // Handle right arrow key (alternate)
+            break;
+        case KBD_END2:
+            // Handle end key (alternate)
+            break;
+        case KBD_DOWN2:
+            // Handle down arrow key (alternate)
+            break;
+        case KBD_PAGEDOWN2:
+            // Handle page down key (alternate)
+            break;
+        case KBD_INSERT2:
+            // Handle insert key (alternate)
+            break;
+        case KBD_DELETE2:
+            // Handle delete key (alternate)
+            break;
+        default:
+            // Handle unknown scan codes
+            printf("Unknown scan code\n");
+            break;
+    }
+eoi:
+    pic_send_eoi(1);
+}

ps2.h

@@ -0,0 +1,115 @@
+#ifndef ANDEWOS_PS2_H
+#define ANDEWOS_PS2_H
+
+#define PS2_8042_DATA    0x60
+#define PS2_8042_STATUS  0x64
+#define PS2_8042_COMMAND 0x64
+
+// SCANCODES
+#define KBD_ESC 0x01
+#define KBD_1 0x02
+#define KBD_2 0x03
+#define KBD_3 0x04
+#define KBD_4 0x05
+#define KBD_5 0x06
+#define KBD_6 0x07
+#define KBD_7 0x08
+#define KBD_8 0x09
+#define KBD_9 0x0A
+#define KBD_0 0x0B
+#define KBD_MINUS 0x0C
+#define KBD_EQUALS 0x0D
+#define KBD_BACKSPACE 0x0E
+#define KBD_TAB 0x0F
+#define KBD_Q 0x10
+#define KBD_W 0x11
+#define KBD_E 0x12
+#define KBD_R 0x13
+#define KBD_T 0x14
+#define KBD_Y 0x15
+#define KBD_U 0x16
+#define KBD_I 0x17
+#define KBD_O 0x18
+#define KBD_P 0x19
+#define KBD_LBRACKET 0x1A
+#define KBD_RBRACKET 0x1B
+#define KBD_ENTER 0x1C
+#define KBD_LCTRL 0x1D
+#define KBD_A 0x1E
+#define KBD_S 0x1F
+#define KBD_D 0x20
+#define KBD_F 0x21
+#define KBD_G 0x22
+#define KBD_H 0x23
+#define KBD_J 0x24
+#define KBD_K 0x25
+#define KBD_L 0x26
+#define KBD_SEMICOLON 0x27
+#define KBD_APOSTROPHE 0x28
+#define KBD_GRAVE 0x29
+#define KBD_LSHIFT 0x2A
+#define KBD_BACKSLASH 0x2B
+#define KBD_Z 0x2C
+#define KBD_X 0x2D
+#define KBD_C 0x2E
+#define KBD_V 0x2F
+#define KBD_B 0x30
+#define KBD_N 0x31
+#define KBD_M 0x32
+#define KBD_COMMA 0x33
+#define KBD_PERIOD 0x34
+#define KBD_SLASH 0x35
+#define KBD_RSHIFT 0x36
+#define KBD_PRINTSCREEN 0x37
+#define KBD_LALT 0x38
+#define KBD_SPACE 0x39
+#define KBD_CAPSLOCK 0x3A
+#define KBD_F1 0x3B
+#define KBD_F2 0x3C
+#define KBD_F3 0x3D
+#define KBD_F4 0x3E
+#define KBD_F5 0x3F
+#define KBD_F6 0x40
+#define KBD_F7 0x41
+#define KBD_F8 0x42
+#define KBD_F9 0x43
+#define KBD_F10 0x44
+#define KBD_NUMLOCK 0x45
+#define KBD_SCROLLLOCK 0x46
+#define KBD_HOME 0x47
+#define KBD_UP 0x48
+#define KBD_PAGEUP 0x49
+#define KBD_KP_MINUS 0x4A
+#define KBD_LEFT 0x4B
+#define KBD_KP_5 0x4C
+#define KBD_RIGHT 0x4D
+#define KBD_KP_PLUS 0x4E
+#define KBD_END 0x4F
+#define KBD_DOWN 0x50
+#define KBD_PAGEDOWN 0x51
+#define KBD_INSERT 0x52
+#define KBD_DELETE 0x53
+#define KBD_SYSRQ 0x54
+#define KBD_F11 0x57
+#define KBD_F12 0x58
+#define KBD_KP_ENTER 0x9C
+#define KBD_RCTRL 0x9D
+#define KBD_KP_DIVIDE 0xB5
+#define KBD_PRINTSCREEN2 0xB7
+#define KBD_RALT 0xB8
+#define KBD_HOME2 0xC7
+#define KBD_UP2 0xC8
+#define KBD_PAGEUP2 0xC9
+#define KBD_LEFT2 0xCB
+#define KBD_RIGHT2 0xCD
+#define KBD_END2 0xCF
+#define KBD_DOWN2 0xD0
+#define KBD_PAGEDOWN2 0xD1
+#define KBD_INSERT2 0xD2
+#define KBD_DELETE2 0xD3
+
+void initialize_8042ps2();
+extern void ps2_isr();
+void ps2_handler();
+
+#endif

strcmp.c

@@ -1,5 +1,15 @@
 #include <strcmp.h>
 
+int strcmp(const char *s1, const char *s2)
+{
+    while(*s1 && (*s1 == *s2))
+    {
+        s1++;
+        s2++;
+    }
+    return *(const unsigned char*)s1 - *(const unsigned char*)s2;
+}
+
 int strncmp( const char * s1, const char * s2, int n ) {
     while ( n && *s1 && ( *s1 == *s2 ) )
     {

strcmp.h

@@ -1,6 +1,7 @@
 #ifndef RK_STRCMP_
 #define RK_STRCMP_
 
+int strcmp(const char *s1, const char *s2);
 int strncmp(const char *s1, const char *s2, int n);
 
 #endif

vga.c

@@ -55,7 +55,7 @@ void _putchar(char character) {
         set_cursor_pos(next_line);
     } else {
         video_memory[0] = character;
-        video_memory[1] = WHITE_ON_BLACK;
+        //video_memory[1] = WHITE_ON_BLACK;
         set_cursor_pos(pos + 1);
     }
 }