org

.clang-format

@@ -0,0 +1,8 @@
+---
+BasedOnStyle: LLVM
+AlignAfterOpenBracket: Align
+AlignConsecutiveDeclarations: 'true'
+AlignTrailingComments: 'true'
+DisableFormat: 'false'
+
+...

CMakeLists.txt

@@ -1,4 +1,6 @@
 cmake_minimum_required(VERSION 3.10)
+set(CMAKE_C_COMPILER_WORKS 1) # todo: find the proper fix for this, rn this is 
+# b/c cmake expects libc to be avaliable and it's not under nixos
 
 project(razzle C ASM)
 
@@ -20,7 +22,7 @@ set(CMAKE_ASM_FLAGS "-g")
 set(LINKER_SCRIPT ${CMAKE_SOURCE_DIR}/linker.ld)
 
 # Common source files
-FILE(GLOB SOURCES kernel/kernel.c)
+FILE(GLOB_RECURSE SOURCES kernel/*.c)
 
 # Architecture Specific Files
 if (ARCH STREQUAL "i386")
@@ -40,13 +42,15 @@ add_custom_command(OUTPUT os.iso
     COMMENT "Generating OS ISO"
 )
 
+# Supplemental PCI data to be loaded into memory
 add_custom_target(pci_supp
-    COMMAND xxd -i ../build_supp/pci/pci.ids > ../kernel/pci_supp.c
+    COMMAND xxd -i ../build_supp/pci/pci.ids > ../supp/pci_supp.c
     COMMENT "Generating Supplemental PCI data"
 )
 
-
 # Run & Debug targets 
-add_custom_target(run COMMAND qemu-system-i386 -boot d -m 512 -machine type=pc-i440fx-3.1 -serial stdio -device piix3-ide,id=ide -drive id=disk,file=/dev/null,format=raw,if=none -device ide-hd,drive=disk,bus=ide.1 -device ide-cd,drive=cdrom -drive id=cdrom,file=os.iso,media=cdrom,if=none DEPENDS os.iso)
+add_custom_target(run 
+    COMMAND qemu-system-i386 -boot d -m 512 -machine type=pc-i440fx-3.1 -serial mon:stdio -device piix3-ide,id=ide -drive id=disk,file=/dev/null,format=raw,if=none -device ide-hd,drive=disk,bus=ide.1 -device ide-cd,drive=cdrom -drive id=cdrom,file=os.iso,media=cdrom,if=none
+    DEPENDS os.iso)
 add_custom_target(debug COMMAND ../debug.sh DEPENDS os.iso)
 

arch/i386/asm/asm.c

@@ -0,0 +1,9 @@
+#include "asm.h"
+
+void __sl_acquire(uint32_t *lock_id) {
+  __asm__("retry_lock: lock bts $0,(%0); pause; jc retry_lock" : "+g"(lock_id));
+}
+
+void __sl_release(uint32_t *lock_id) {
+  __asm__("lock btr $0, (%0)" : "+g"(lock_id));
+}

arch/i386/asm/asm.h

@@ -9,13 +9,8 @@ struct regs {
   unsigned int eip, cs, eflags, useresp, ss;
 };
 
-void __sl_acquire(uint32_t *lock_id) {
+void __sl_acquire(uint32_t *);
-  __asm__("retry_lock: lock bts $0,(%0); pause; jc retry_lock" : "+g"(lock_id));
+void __sl_release(uint32_t *);
-}
-
-void __sl_release(uint32_t *lock_id) {
-  __asm__("lock btr $0, (%0)" : "+g"(lock_id));
-}
 
 static inline void outb(int port, int val) {
   __asm__ volatile("outb %b0, %w1" : : "a"(val), "Nd"(port) : "memory");
@@ -37,6 +32,16 @@ static inline uint32_t inl(uint32_t port) {
   return val;
 }
 
+static inline void outw(uint16_t port, uint16_t val) {
+  __asm__ volatile("outw %w0, %w1" : : "a"(val), "Nd"(port) : "memory");
+}
+
+static inline uint16_t inw(uint16_t port) {
+  uint32_t val;
+  __asm__ volatile("inw %w1, %w0" : "=a"(val) : "Nd"(port) : "memory");
+  return val;
+}
+
 static inline void interrupt_disable() { __asm__ volatile("cli"); }
 
 static inline void interrupt_enable() { __asm__ volatile("sti"); }

arch/i386/gdt.c

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "../../kernel/memory.c"
+#include "../../kernel/memory/memory.h"
 #include <stdint.h>
 
 struct gdt_row_t {

arch/i386/idt.c

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "../../kernel/memory.c"
+#include "../../kernel/memory/memory.h"
 #include "./handlers.h"
 #include "gdt.c"
 
@@ -26,7 +26,8 @@ enum idt_flag_t {
   IDTFLAG_INTERRUPT = 0b00001110,
 };
 
-#define KERNEL_INTERRUPT_FLAG (IDTFLAG_PRESENT | IDTFLAG_DPL_KERNEL | IDTFLAG_INTERRUPT)
+#define KERNEL_INTERRUPT_FLAG                                                  \
+  (IDTFLAG_PRESENT | IDTFLAG_DPL_KERNEL | IDTFLAG_INTERRUPT)
 #define USER_TRAP_FLAG (IDTFLAG_PRESENT | IDTFLAG_DPL_USER | IDTFLAG_INTERRUPT)
 
 #define IDT_SIZE (256)

arch/i386/irq.c

@@ -1,8 +1,8 @@
 #pragma once
 
-#include "../../kernel/ps2.c"
+#include "../../kernel/drivers/ps2/ps2.h"
-#include "../../kernel/syscall.c"
+#include "../../kernel/syscall/syscall.h"
-#include "./asm.c"
+#include "./asm/asm.c"
 #include "./idt.c"
 #include "handlers.h"
 

arch/i386/scheduler/scheduler.c

@@ -1,13 +1,4 @@
-#pragma once
+#include "scheduler.h"
-
-#include "asm.c"
-
-enum eflags_t {
-  EFLAG_CARRY = 0x0001,
-  EFLAG_RES = 0x0002,
-  EFLAG_PARITY = 0x0004,
-  EFLAG_INTERRUPT = 0x0200
-};
 
 void initialize_registers(struct regs *new_regs, char *entrypoint,
                           uint32_t address_base, uint32_t address_space_size) {

arch/i386/scheduler/scheduler.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include "../asm/asm.h"
+#include <stdint.h>
+
+enum eflags_t {
+  EFLAG_CARRY = 0x0001,
+  EFLAG_RES = 0x0002,
+  EFLAG_PARITY = 0x0004,
+  EFLAG_INTERRUPT = 0x0200
+};
+
+void initialize_registers(struct regs *, char *, uint32_t, uint32_t);
+void store_registers(struct regs *, struct regs *);
+void switch_context(struct regs *, struct regs *);

format.sh

@@ -0,0 +1,2 @@
+git ls-files -- '*.c' '*.h' | xargs clang-format -i -style=file
+git diff --exit-code --color

kernel/acpi/rsdp.c

@@ -0,0 +1,116 @@
+#include <stdint.h>
+
+#include "../io/io.h"
+#include "../memory/memory.h"
+#include "rsdp.h"
+
+struct rsdp_t {
+  char     signature[8];
+  uint8_t  checksum;
+  char     oem_id[6];
+  uint8_t  revision;
+  uint32_t rsdt_address;
+} __attribute__((packed));
+
+struct xsdp_t {
+  char     signature[8];
+  uint8_t  checksum;
+  char     oem_id[6];
+  uint8_t  revision;
+  uint32_t unused;
+  uint32_t length;
+  uint32_t xsdt_addr_hi;
+  uint32_t xsdt_addr_lo;
+  uint8_t  checksum_ext;
+  uint8_t  unused_[3];
+} __attribute__((packed));
+
+struct acpi_header_t {
+  char     signature[4];
+  uint32_t length;
+  uint8_t  revision;
+  uint8_t  checksum;
+  char     oem_id[6];
+  char     oem_table_id[8];
+  uint32_t oem_revision;
+  uint32_t creator_id;
+  uint32_t creator_division;
+} __attribute__((packed));
+
+struct rsdt_t {
+  struct acpi_header_t header;
+  uint32_t             pointer[64];
+};
+
+uint8_t validate(struct rsdp_t *ptr) {
+  char sig[] = "RSD PTR ";
+  if (!memseq(ptr->signature, sig, 8))
+    return 0;
+
+  uint8_t *rsdp_bytes = (uint8_t *)ptr;
+  uint8_t  sum = 0;
+  for (uint8_t i = 0; i < 20; i++) {
+    sum += rsdp_bytes[i];
+  }
+
+  if (sum == 0 && ptr->revision == 2) {
+    printf_nolock("acpi: ACPI v2+ not yet supported :(\n");
+    for (;;) {
+    }
+    // TODO: test with ACPI 2 System
+    struct xsdp_t *r2_ptr = (struct xsdp_t *)ptr;
+
+    uint8_t *xsdp_bytes = ((uint8_t *)r2_ptr) + 8;
+    for (uint8_t i = 0; i < 16; i++) {
+      sum += xsdp_bytes[i];
+    }
+  }
+
+  return sum == 0;
+}
+
+char *find_table(struct rsdt_t *table, char *sig) {
+  uint32_t entries = (table->header.length - sizeof table->header) / 4;
+  for (uint32_t i = 0; i < entries; i++) {
+    struct acpi_header_t *entry = (struct acpi_header_t *)table->pointer[i];
+    if (memseq(entry->signature, sig, 4)) {
+      printf_nolock("Found %s /  %s\n", entry->oem_id, entry->signature);
+      printf_nolock("Signature: %s\n", entry->signature);
+      printf_nolock("Length   : %d\n", entry->length);
+      printf_nolock("Oem ID   : %s\n", entry->oem_id);
+      printf_nolock("Checksum : %d\n", entry->checksum);
+      return (void *)entry;
+    }
+  }
+
+  printf_nolock("Not Found");
+  return 0;
+}
+
+void find_rsdp() {
+  struct rsdp_t *ptr;
+
+  volatile uint8_t found = 0;
+  for (uint32_t addr = 0x00000000; addr <= 0x000FFFFF; addr++) {
+    ptr = (struct rsdp_t *)addr;
+
+    if (validate(ptr)) {
+      found = 1;
+      break;
+    }
+  }
+
+  if (!found) {
+    uint8_t *ebda = (uint8_t *)(*((uint16_t *)0x40e) << 4);
+    for (uint32_t i = 0; i <= 1024; i += 16) {
+      ptr = (struct rsdp_t *)ebda;
+      if (validate(ptr)) {
+        found = 1;
+        break;
+      }
+    }
+  }
+
+  printf_nolock("acpi: RSDP Found [OEM: %s, SIG:  %s]\n", ptr->oem_id,
+                ptr->signature);
+}

kernel/acpi/rsdp.h

@@ -0,0 +1,3 @@
+#pragma once
+
+void find_rsdp();

kernel/drivers/blk/blk.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <stdint.h>
+
+struct block_dev {
+    char name[16];
+  uint32_t sector_size;
+  uint32_t device_no;
+  uint32_t num_sectors;
+  uint32_t (*read_sector)(uint32_t, uint32_t, char *);
+  uint32_t (*write_sector)(uint32_t, uint32_t, char *);
+};
+
+void BLK__init();
+uint32_t BLK__register_device(struct block_dev*);
+uint32_t BLK__get_block_devices(struct block_dev* devices, uint32_t req_num);
+uint32_t BLK__get_block_device(struct block_dev* devices, uint32_t req_num);

kernel/drivers/blk/ramblk/ramblk.c

@@ -0,0 +1,45 @@
+#include "./ramblk.h"
+#include "../../../memory/memory.h"
+#include "../blk.h"
+
+#define RAMFS_BYTES (1024 * 1024 * 5) // 5 MB
+#define SECTOR_SIZE (512)
+
+char ramfs_blocks[RAMFS_BYTES];
+
+uint32_t RAMBLK__read_sector(uint32_t device, uint32_t sector, char *out) {
+  if (sector * SECTOR_SIZE >= RAMFS_BYTES) {
+    // Out of bounds
+    return 0;
+  }
+
+  uint32_t byte = sector * SECTOR_SIZE;
+
+  memcpy(ramfs_blocks + byte, out, SECTOR_SIZE);
+  return 1;
+}
+
+uint32_t RAMBLK__write_sector(uint32_t device, uint32_t sector, char *in) {
+  if ((sector + 1) * SECTOR_SIZE >= RAMFS_BYTES) {
+    // Out of bounds
+    return 0;
+  }
+
+  uint32_t byte = sector * SECTOR_SIZE;
+
+  memcpy(in, ramfs_blocks + byte, SECTOR_SIZE);
+  return 1;
+}
+
+void RAMBLK__init() { 
+    memset(ramfs_blocks, 0x00, RAMFS_BYTES); 
+    struct block_dev bd = {
+        .name = "RAM_BLK",
+        .sector_size = SECTOR_SIZE,
+        .device_no = 0,
+        .num_sectors = RAMFS_BYTES / SECTOR_SIZE,
+        .read_sector = &RAMBLK__read_sector,
+        .write_sector = &RAMBLK__write_sector
+    };
+    BLK__register_device(&bd);
+}

kernel/drivers/blk/ramblk/ramblk.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include <inttypes.h>
+
+void     RAMBLK__init();
+uint32_t RAMBLK__read_sector(uint32_t device, uint32_t sector, char *out);
+uint32_t RAMBLK__write_sector(uint32_t device, uint32_t sector, char *in);

kernel/drivers/fs/nqfs/nqfs.c

@@ -0,0 +1,208 @@
+// Nick's Quick(ly made) File System
+#include "nqfs.h"
+#include "../../../io/io.h"
+#include "../../../memory/memory.h"
+
+#define FILEPTR_SECTORS (128)
+#define FILEPTR_PER_SECTOR (4)
+#define FILEPTR_CNT (FILEPTR_SECTORS * FILEPTR_PER_SECTOR)
+
+void NQFS_init() {}
+
+uint32_t NQFS_get_next_free_block(struct block_dev *device) {
+  char                       sector[512];
+  struct NQFS_storage_block *sb = (struct NQFS_storage_block *)sector;
+
+  for (uint32_t i = FILEPTR_SECTORS; i < device->num_sectors; ++i) {
+    if (!device->read_sector(device->device_no, i, sector)) {
+      return 0;
+    }
+    if (sb->magic_number != 0xC001) {
+      sb->magic_number = 0xC001;
+      sb->next_sector = 0;
+      if (!device->write_sector(device->device_no, i, sector)) {
+        return 0;
+      }
+      return i;
+    }
+  }
+
+  return 0;
+}
+
+uint32_t NQFS_create_file(struct block_dev *device, char *filename) {
+  char sector[512];
+  for (int i = 0; i < FILEPTR_SECTORS; ++i) {
+    if (!device->read_sector(device->device_no, i, sector)) {
+      return 0;
+    }
+    struct NQFS_inode *fp = (struct NQFS_inode *)sector;
+    for (int j = 0; j < FILEPTR_PER_SECTOR; ++j) {
+      if (!fp->allocd) {
+        uint32_t new_sector = NQFS_get_next_free_block(device);
+        if (new_sector == 0) {
+          return 0;
+        }
+        fp->allocd = 1;
+        fp->size = 0;
+        fp->start_sector = new_sector;
+        strncpy(filename, fp->filename, NQFS_MAX_FILENAME_SIZE);
+        fp->filename[NQFS_MAX_FILENAME_SIZE - 1] = '\0';
+        if (!device->write_sector(device->device_no, i, sector)) {
+          return 0;
+        }
+        printf_nolock("Created file \"%s\" at sector  %d fp %d\n", fp->filename,
+                      new_sector, i);
+        return i;
+      }
+      fp++;
+    }
+  }
+  return 0;
+}
+uint32_t NQFS_read_bytes(struct block_dev *device, uint32_t inode_sector,
+                         char *out, uint32_t size) {
+  char               sector[512];
+  struct NQFS_inode *fp = (struct NQFS_inode *)sector;
+  if (!device->read_sector(device->device_no, inode_sector, sector)) {
+    return 0;
+  }
+  char                       storage_sector[512];
+  struct NQFS_storage_block *sb = (struct NQFS_storage_block *)storage_sector;
+
+  if (fp->start_sector != 0) {
+    uint32_t read_sector = fp->start_sector;
+
+    if (size > fp->size) {
+      size = fp->size;
+    }
+
+    while (size > 0) {
+      if (!device->read_sector(device->device_no, read_sector,
+                               storage_sector)) {
+        return 0;
+      }
+
+      uint32_t readable = NQFS_STORAGE_BYTES_SECTOR;
+      if (size < readable) {
+        readable = size;
+      }
+
+      // Copy data into struct
+      memcpy(sb->data, out, readable);
+      out += readable;
+      size -= readable;
+
+      if (size > 0) {
+        read_sector = sb->next_sector;
+        if (read_sector == 0) {
+          return size;
+        }
+      }
+    }
+
+    return size;
+
+  } else {
+    printf_nolock("didn't find start\n");
+    return 0;
+  }
+}
+
+uint32_t NQFS_write_bytes(struct block_dev *device, uint32_t inode_sector,
+                          char *in, uint32_t size) {
+  uint32_t           total_written = 0;
+  char               sector[512];
+  struct NQFS_inode *fp = (struct NQFS_inode *)sector;
+  if (!device->read_sector(device->device_no, inode_sector, sector)) {
+    return 0;
+  }
+  char                       storage_sector[512];
+  struct NQFS_storage_block *sb = (struct NQFS_storage_block *)storage_sector;
+
+  if (fp->start_sector != 0) {
+    uint32_t cur_size = fp->size;
+    uint32_t read_sector = fp->start_sector;
+
+    while (cur_size >= NQFS_STORAGE_BYTES_SECTOR) {
+      if (!device->read_sector(device->device_no, read_sector,
+                               storage_sector)) {
+        return 0;
+      }
+
+      cur_size -= NQFS_STORAGE_BYTES_SECTOR;
+      read_sector = sb->next_sector;
+      if (read_sector == 0) {
+        sb->next_sector = NQFS_get_next_free_block(device);
+        read_sector = sb->next_sector;
+        if (read_sector == 0) {
+          return 0;
+        }
+      }
+    }
+
+    while (size > 0) {
+      if (!device->read_sector(device->device_no, read_sector,
+                               storage_sector)) {
+        return 0;
+      }
+
+      uint32_t writeable = NQFS_STORAGE_BYTES_SECTOR - cur_size;
+      if (size < writeable) {
+        writeable = size;
+      }
+
+      // Copy data into struct
+      memcpy(in + total_written, sb->data + cur_size, writeable);
+      cur_size = 0;
+
+      fp->size += writeable;
+      total_written += writeable;
+
+      if (!device->write_sector(device->device_no, inode_sector, sector)) {
+        return 0;
+      }
+
+      // Write struct out to disk
+      if (!device->write_sector(device->device_no, read_sector,
+                                storage_sector)) {
+        return 0;
+      }
+      size -= writeable;
+      if (size > 0) {
+        sb->next_sector = NQFS_get_next_free_block(device);
+        // Write struct out to disk
+        if (!device->write_sector(device->device_no, read_sector,
+                                  storage_sector)) {
+          return 0;
+        }
+        read_sector = sb->next_sector;
+        if (read_sector == 0) {
+          return 0;
+        }
+      }
+    }
+  } else {
+    printf_nolock("File didn't point to a storage block\n");
+    return 0;
+  }
+
+  return total_written;
+}
+
+void NQFS_DEBUG_list_files(struct block_dev *device) {
+  char sector[512];
+  for (int i = 0; i < FILEPTR_SECTORS; ++i) {
+    if (!device->read_sector(device->device_no, i, sector)) {
+      printf_nolock("Error reading sector %d\n", i);
+      return;
+    }
+    struct NQFS_inode *fp = (struct NQFS_inode *)sector;
+    for (int j = 0; j < FILEPTR_PER_SECTOR; ++j) {
+      if (fp->allocd) {
+        printf_nolock("Found file: %s\n", fp->filename);
+      }
+      fp++;
+    }
+  }
+}

kernel/drivers/fs/nqfs/nqfs.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include "../../blk/blk.h"
+#include <stdint.h>
+
+#define NQFS_MAX_FILENAME_SIZE (64)
+#define NQFS_STORAGE_BYTES_SECTOR (504)
+
+struct NQFS_inode {
+  uint8_t  allocd;
+  char     filename[NQFS_MAX_FILENAME_SIZE];
+  uint32_t start_sector;
+  uint32_t size;
+  char     _[55];
+} __attribute__((packed));
+
+struct NQFS_storage_block {
+  uint32_t magic_number;
+  char     data[NQFS_STORAGE_BYTES_SECTOR];
+  uint32_t next_sector;
+} __attribute__((packed));
+
+uint32_t NQFS_get_next_free_inode(struct block_dev *device);
+uint32_t NQFS_create_file(struct block_dev *device, char *filename);
+
+// Returns number of bytes read into char
+uint32_t NQFS_read_bytes(struct block_dev *device, uint32_t inode_sector,
+                         char *out, uint32_t max_size);
+uint32_t NQFS_write_bytes(struct block_dev *device, uint32_t inode_sector,
+                          char *in, uint32_t size);
+
+void NQFS_DEBUG_list_files(struct block_dev *device);

kernel/drivers/ps2/ps2.c

@@ -1,8 +1,6 @@
-#pragma once
+#include "./ps2.h"
 
-#include "./scheduler.c"
+struct ps2_waiter_t ps2_waiters[MAX_PROCESSES];
-#include "./vga.c"
-#include <stdint.h>
 
 enum key_code_t {
   backtick_tilde = 1,
@@ -244,14 +242,6 @@ char keycode_to_char(enum key_code_t key_code) {
   return '\0';
 }
 
-
-struct ps2_waiter_t {
-    uint8_t alloc;
-    uint32_t pid;
-};
-
-struct ps2_waiter_t ps2_waiters[MAX_PROCESSES];
-
 void init_ps2() {
   for (uint32_t i = 0; i < MAX_PROCESSES; i++) {
     ps2_waiters[i].alloc = 0;

kernel/drivers/ps2/ps2.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <stdint.h>
+
+#include "../../scheduler/scheduler.h"
+
+struct ps2_waiter_t {
+  uint8_t  alloc;
+  uint32_t pid;
+};
+
+extern struct ps2_waiter_t ps2_waiters[MAX_PROCESSES];
+
+void init_ps2();
+void handle_keypress_char(char);
+void handle_keypress(uint8_t);

kernel/drivers/serial.c

@@ -1,36 +0,0 @@
-#pragma once
-#include "../../arch/i386/asm.c"
-
-#define COM1 (0x3F8)
-
-int serial_init() {
-   outb(COM1 + 1, 0x01);  
-   outb(COM1 + 3, 0x80);  
-   outb(COM1 + 0, 0x03);  
-   outb(COM1 + 1, 0x00);  
-   outb(COM1 + 3, 0x03);  
-   outb(COM1 + 2, 0xC7);  
-   outb(COM1 + 4, 0x0B); 
-   outb(COM1 + 4, 0x0F);
-   return 0;
-}
-
-int serial_has_tx() {
-   return inb(COM1 + 5) & 0x20;
-}
-
-int serial_has_rx() {
-   return inb(COM1 + 5) & 1;
-}
-
-void serial_tx(char a) {
-   while (serial_has_tx() == 0);
-
-   outb(COM1,a);
-}
-
-char serial_rx() {
-   while (serial_has_rx() == 0);
-
-   return inb(COM1);
-}

kernel/drivers/serial/serial.c

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "serial.h"
+#include "../../../arch/i386/asm/asm.h"
+
+#define COM1 (0x3F8)
+
+int serial_init() {
+  outb(COM1 + 1, 0x01);
+  outb(COM1 + 3, 0x80);
+  outb(COM1 + 0, 0x03);
+  outb(COM1 + 1, 0x00);
+  outb(COM1 + 3, 0x03);
+  outb(COM1 + 2, 0xC7);
+  outb(COM1 + 4, 0x0B);
+  outb(COM1 + 4, 0x0F);
+  return 0;
+}
+
+int serial_has_tx() { return inb(COM1 + 5) & 0x20; }
+
+int serial_has_rx() { return inb(COM1 + 5) & 1; }
+
+void serial_tx(char a) {
+  while (serial_has_tx() == 0)
+    ;
+
+  outb(COM1, a);
+}
+
+char serial_rx() {
+  while (serial_has_rx() == 0)
+    ;
+
+  return inb(COM1);
+}

kernel/drivers/serial/serial.h

@@ -0,0 +1,5 @@
+#pragma once
+
+int  serial_init();
+void serial_tx(char);
+char serial_rx();

kernel/drivers/vga/vga.c

@@ -0,0 +1,109 @@
+#pragma once
+
+#include "vga.h"
+#include "../../memory/memory.h"
+#include <stdint.h>
+
+#define WIDTH 80
+#define HEIGHT 25
+
+static char vga_buf[HEIGHT * (WIDTH * 2)];
+
+static uint8_t vgabuf_col = 0;
+static uint8_t vgabuf_row = 0;
+
+static uint8_t vgabuf_start_row = 0;
+static uint8_t vgabuf_move_row = 0;
+
+static uint8_t default_color_code = 10;
+static char   *vram = (char *)0xb8000;
+
+static inline int VGA_idx(int row, int col) {
+  return (row * WIDTH * 2) + (col * 2);
+}
+
+static inline void VGA_set(int row, int col, char c, int color_code) {
+  vga_buf[VGA_idx(row, col)] = c;
+  vga_buf[VGA_idx(row, col) + 1] = color_code;
+}
+
+void VGA_flush() {
+  int topwrite = ((HEIGHT - vgabuf_start_row) * WIDTH * 2);
+
+  // Fill the top of the display from the offsetted buffer
+  memcpy(vga_buf + (vgabuf_start_row * WIDTH * 2), vram, topwrite);
+
+  // Fill the bottom of the display from the offsetted buffer
+  memcpy(vga_buf, vram + topwrite, ((vgabuf_start_row)*WIDTH * 2));
+}
+
+void VGA_clear_screen() {
+  for (int r = 0; r < HEIGHT - 1; r++) {
+    for (int c = 0; c < WIDTH; c++) {
+      VGA_set(r, c, ' ', default_color_code);
+    }
+  }
+
+  vgabuf_start_row = 0;
+  vgabuf_col = 0;
+  vgabuf_row = 0;
+
+  VGA_flush();
+}
+
+void VGA_clear_line() {
+  for (int i = 0; i < WIDTH; ++i) {
+    VGA_set(vgabuf_start_row, i, ' ', default_color_code);
+  }
+}
+
+void VGA_putc(char c) {
+  if (vgabuf_col == WIDTH) {
+    vgabuf_row = (vgabuf_row + 1) % HEIGHT;
+    vgabuf_col = 0;
+
+    if (vgabuf_start_row > 0 || vgabuf_row == 0) {
+      if (vgabuf_move_row == vgabuf_start_row) {
+        vgabuf_start_row = (vgabuf_start_row + 1) % HEIGHT;
+        vgabuf_move_row = vgabuf_start_row;
+      } else {
+        vgabuf_move_row++;
+      }
+      VGA_clear_line();
+    }
+  }
+
+  if (c == '\n') {
+    for (int i = vgabuf_col; i < WIDTH; i++) {
+      VGA_set(vgabuf_row, i, ' ', default_color_code);
+    }
+    vgabuf_row = (vgabuf_row + 1) % HEIGHT;
+    vgabuf_col = 0;
+
+    if (vgabuf_start_row > 0 || vgabuf_row == 0) {
+      if (vgabuf_move_row == vgabuf_start_row) {
+        vgabuf_start_row = (vgabuf_start_row + 1) % HEIGHT;
+        vgabuf_move_row = vgabuf_start_row;
+      } else {
+        vgabuf_move_row++;
+      }
+      VGA_clear_line();
+    }
+    return;
+  }
+
+  if (c == '\b') {
+    if (vgabuf_col == 0) {
+      vgabuf_col = WIDTH - 1;
+      vgabuf_row--;
+      vgabuf_move_row--;
+    } else {
+      vgabuf_col--;
+    }
+    // VGA_set(vgabuf_row, vgabuf_col, ' ', default_color_code);
+    return;
+  }
+
+  VGA_set(vgabuf_row, vgabuf_col, c, default_color_code);
+  vgabuf_col++;
+}

kernel/drivers/vga/vga.h

@@ -0,0 +1,5 @@
+#pragma once
+
+void VGA_clear_screen();
+void VGA_putc(char);
+void VGA_flush();

kernel/io/io.c

@@ -1,58 +1,12 @@
-#pragma once
+#include "io.h"
-
+#include "../drivers/serial/serial.h"
-#include "./spin_lock.c"
+#include "../drivers/vga/vga.h"
-#include "./drivers/serial.c"
-#include <stdarg.h>
 #include <stdint.h>
 
-#define WIDTH 80
+#include "../spin_lock.h"
-#define HEIGHT 25
-
-static uint8_t col = 0;
-static uint8_t row = 0;
-static uint8_t color_code = 10;
-static char *vram = (char *)0xb8000;
-
-void clear_screen() {
-  for (int i = 0; i < HEIGHT - 1; i++) {
-    for (int j = 0; j < WIDTH; j++) {
-      vram[(i * WIDTH * 2) + (j * 2)] = 0;
-      // vram[(i * WIDTH * 2) + (j*2 + 1)] = 0;
-    }
-  }
-  row = 0;
-  col = 0;
-}
 
 void putc(char c) {
-  if (col == WIDTH) {
+  VGA_putc(c);
-    row = (row + 1) % HEIGHT;
-    col = 0;
-  }
-
-  if (c == '\n') {
-    for (int i = col; i < WIDTH; i++) {
-      vram[(row * WIDTH * 2) + (i * 2)] = ' ';
-      vram[(row * WIDTH * 2) + (i * 2 + 1)] = color_code;
-    }
-    row = (row + 1) % HEIGHT;
-    col = 0;
-    serial_tx('\n');
-    return;
-  }
-
-  if (c == '\b') {
-    col--;
-    vram[(row * WIDTH * 2) + (col * 2)] = ' ';
-    vram[(row * WIDTH * 2) + (col * 2 + 1)] = color_code;
-    serial_tx('\b');
-    return;
-  }
-
-  vram[(row * WIDTH * 2) + (col * 2)] = c;
-  vram[(row * WIDTH * 2) + (col * 2 + 1)] = color_code;
-  col++;
-
   serial_tx(c);
 }
 
@@ -150,6 +104,7 @@ void printf_base(char *str, va_list list) {
       putc(str[i]);
     }
   }
+  VGA_flush();
 }
 
 void printf_nolock(char *str, ...) {

kernel/io/io.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include <stdarg.h>
+
+void putc(char);
+void printf(char *, ...);
+void printf_nolock(char *, ...);

kernel/kernel.c

@@ -1,32 +1,48 @@
-#include "./drivers/serial.c"
+#pragma once
-#include "./pci.c"
+
-#include "./rsdp.c"
+#include "./acpi/rsdp.h"
-#include "./scheduler.c"
+#include "./drivers/serial/serial.h"
-#include "./vga.c"
+#include "./drivers/vga/vga.h"
+#include "./io/io.h"
+#include "./pci/pci.h"
+#include "./scheduler/scheduler.h"
 #include <stdint.h>
 
-#include "./test_processes.c"
+#include "../arch/i386/scheduler/scheduler.c"
+#include "../supp/test_processes.c"
+#include "./drivers/blk/ramblk/ramblk.h"
+#include "./drivers/fs/nqfs/nqfs.h"
+#include "./drivers/ps2/ps2.h"
+#include "drivers/blk/blk.h"
 
 #ifdef ARCH_I386
 #include "../arch/i386/init.c"
 #endif
 
 int kernel_main() {
-  lock = 0;
-
   outb(0x3D4, 0x0A);
   outb(0x3D5, 0x20);
   serial_init();
-
   find_rsdp();
   pci_enumerate_devices();
-  clear_screen();
+  VGA_clear_screen();
-
   interrupt_disable();
-
   arch_init();
-
   init_process_table();
+  init_ps2();
+
+  // Init block device list
+  BLK__init();
+
+  // Init block device drivers
+  RAMBLK__init();
+
+  struct block_dev blk_devices[128];
+  uint32_t blkdev_cnt = BLK__get_block_devices(blk_devices, 128);
+
+  for(uint32_t i = 0; i < blkdev_cnt; ++i) {
+      printf("blk: %d: %s with capacity %d Bytes\n", blk_devices[i].device_no, blk_devices[i].name, (blk_devices[i].num_sectors * blk_devices[i].sector_size));
+  }
 
   start_process("razzle", (char *)&test_razzle);
   start_process("dazzle", (char *)&test_dazzle);
@@ -38,7 +54,7 @@ int kernel_main() {
 }
 
 void fault_handler(struct regs *r) {
-  clear_screen();
+  VGA_clear_screen();
   printf("!!! Kernel Panic !!!\n");
   switch (r->int_no) {
   case 0: {

kernel/memory/memory.c

@@ -1,22 +1,4 @@
-#pragma once
+#include "memory.h"
-
-#include <stdint.h>
-
-// Below doesn't work!
-// uint8_t streq(char *ptr, char* ptr2) {
-//    while (1 == 1) {
-//        if (*ptr != *ptr2) {
-//            return 0;
-//        }
-//
-//        if (*ptr == '\0') {
-//            return 1;
-//        }
-//
-//        ptr++;
-//        ptr2++;
-//    }
-//}
 
 uint8_t memseq(char *ptr, char *ptr2, uint32_t len) {
   for (uint32_t i = 0; i < len; i++) {

kernel/memory/memory.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <stdint.h>
+
+uint8_t memseq(char *, char *, uint32_t len);
+uint8_t streq(char *, char *);
+void    memset(char *, char, uint32_t);
+void    memcpy(char *, char *, uint32_t);
+void    strncpy(char *, char *, uint32_t);

kernel/pci/pci.c

@@ -1,28 +1,14 @@
-#pragma once
+#include "./pci.h"
-#include "./pci_supp.c"
+#include "../../supp/pci_supp.c"
-#include "vga.c"
+#include "../io/io.h"
-#include <stdint.h>
+#include "../memory/memory.h"
 
 #ifdef ARCH_I386
-#include "../arch/i386/asm.c"
+#include "../../arch/i386/asm/asm.h"
 #endif
 
-#define PCI_NO_VENDOR (0xFFFF)
+struct pci_device pci_devices_list[PCI_MAX_DEVICES];
-#define PCI_MAX_NAMESIZE (128)
+uint32_t          pci_devices_count;
-#define PCI_MAX_DEVICES (256)
-
-struct pci_device {
-  uint16_t device_id;
-  uint16_t vendor_id;
-  char device_name[PCI_MAX_NAMESIZE];
-  char vendor_name[PCI_MAX_NAMESIZE];
-  uint32_t bar[6];
-  uint8_t class_code;
-  uint8_t subclass_code;
-};
-
-static struct pci_device pci_devices_list[PCI_MAX_DEVICES];
-static uint32_t pci_devices_count;
 
 uint16_t pci_read_config(uint8_t bus, uint8_t slot, uint8_t function,
                          uint8_t offset) {

kernel/pci/pci.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <stdint.h>
+
+#define PCI_NO_VENDOR (0xFFFF)
+#define PCI_MAX_NAMESIZE (128)
+#define PCI_MAX_DEVICES (256)
+
+struct pci_device {
+  uint16_t device_id;
+  uint16_t vendor_id;
+  char     device_name[PCI_MAX_NAMESIZE];
+  char     vendor_name[PCI_MAX_NAMESIZE];
+  uint32_t bar[6];
+  uint8_t  class_code;
+  uint8_t  subclass_code;
+};
+
+extern struct pci_device pci_devices_list[PCI_MAX_DEVICES];
+extern uint32_t          pci_devices_count;
+
+void pci_enumerate_devices();

kernel/rsdp.c

@@ -1,112 +0,0 @@
-#pragma once
-#include <stdint.h>
-#include "memory.c"
-#include "vga.c"
-
-struct rsdp_t {
-    char signature[8];
-    uint8_t checksum;
-    char oem_id[6];
-    uint8_t revision;
-    uint32_t rsdt_address;
-} __attribute__ ((packed));
-
-struct xsdp_t {
-    char signature[8];
-    uint8_t checksum;
-    char oem_id[6];
-    uint8_t revision;
-    uint32_t unused;
-    uint32_t length;
-    uint32_t xsdt_addr_hi;
-    uint32_t xsdt_addr_lo;
-    uint8_t checksum_ext;
-    uint8_t unused_[3];
-} __attribute__ ((packed));
-
-struct acpi_header_t {
-    char signature[4];
-    uint32_t length;
-    uint8_t revision;
-    uint8_t checksum;
-    char oem_id[6];
-    char oem_table_id[8];
-    uint32_t oem_revision;
-    uint32_t creator_id;
-    uint32_t creator_division;
-} __attribute__ ((packed));
-
-struct rsdt_t {
-    struct acpi_header_t header;
-    uint32_t pointer[64];
-};
-
-uint8_t validate(struct rsdp_t *ptr) {
-    char sig[] = "RSD PTR ";
-    if (!memseq(ptr->signature, sig, 8)) return 0;
-
-    uint8_t *rsdp_bytes = (uint8_t *) ptr;
-    uint8_t sum = 0;
-    for(uint8_t i = 0; i < 20; i++) {
-        sum += rsdp_bytes[i];
-    }
-
-    if (sum == 0 && ptr->revision == 2) {
-        printf_nolock("acpi: ACPI v2+ not yet supported :(\n");
-        for(;;){}
-        // TODO: test with ACPI 2 System
-        struct xsdp_t *r2_ptr = (struct xsdp_t*) ptr;
-
-        uint8_t *xsdp_bytes = ((uint8_t *) r2_ptr) + 8;
-        for(uint8_t i = 0; i < 16; i++) {
-            sum += xsdp_bytes[i];
-        }
-    }
-
-    return sum == 0;
-}
-
-char* find_table(struct rsdt_t* table, char* sig) {
-    uint32_t entries = (table->header.length - sizeof table->header) / 4;
-    for (uint32_t i = 0; i < entries; i++) {
-        struct acpi_header_t* entry = (struct acpi_header_t*) table->pointer[i];
-        if (memseq(entry->signature, sig, 4)) {
-            printf_nolock("Found %s /  %s\n", entry->oem_id, entry->signature);
-            printf_nolock("Signature: %s\n", entry->signature);
-            printf_nolock("Length   : %d\n", entry->length);
-            printf_nolock("Oem ID   : %s\n", entry->oem_id);
-            printf_nolock("Checksum : %d\n", entry->checksum);
-            return (void*)entry;
-        }
-    }
-
-    printf_nolock("Not Found");
-    return 0;
-}
-
-void find_rsdp() {
-    struct rsdp_t *ptr;
-
-    volatile uint8_t found = 0;
-    for (uint32_t addr = 0x00000000; addr <= 0x000FFFFF; addr++) {
-        ptr = (struct rsdp_t *) addr;
-
-        if (validate(ptr)) {
-            found = 1;
-            break;
-        }
-    }
-
-    if (!found) {
-        uint8_t* ebda = (uint8_t*)(*((uint16_t*)0x40e) << 4);
-        for (uint32_t i = 0; i <= 1024; i += 16) {
-            ptr = (struct rsdp_t*) ebda;
-            if (validate(ptr)) {
-                found = 1;
-                break;
-            }
-        }
-    }
-        
-    printf_nolock("acpi: RSDP Found [OEM: %s, SIG:  %s]\n", ptr->oem_id, ptr->signature);
-}

kernel/scheduler/scheduler.c

@@ -1,29 +1,13 @@
-#pragma once
+#include "scheduler.h"
+#include "../io/io.h"
+#include "../memory/memory.h"
 
 #ifdef ARCH_I386
-#include "../arch/i386/scheduler.c"
+#include "../../arch/i386/scheduler/scheduler.h"
 #endif
 
-#include "./memory.c"
+struct task_struct process_table[MAX_PROCESSES];
-#include "./vga.c"
+uint32_t           current_pid;
-#include <stdint.h>
-
-#define ADDRESS_SPACE_SIZE 1000000
-#define MAX_PROCESSES 128
-
-enum task_state_t { TASKSTATE_unused, TASKSTATE_ready, TASKSTATE_blocked };
-
-struct task_struct {
-  uint32_t pid;
-  enum task_state_t state;
-  struct regs registers;
-  unsigned int address_base;
-  char *allocd_addr;
-  char *process_name;
-};
-
-static struct task_struct process_table[MAX_PROCESSES];
-static uint32_t current_pid;
 
 void init_process_table() {
   for (uint32_t i = 0; i < MAX_PROCESSES; i++) {

kernel/scheduler/scheduler.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef ARCH_I386
+#include "../../arch/i386/scheduler/scheduler.h"
+#endif
+
+#define ADDRESS_SPACE_SIZE 1000000
+#define MAX_PROCESSES 128
+
+enum task_state_t { TASKSTATE_unused, TASKSTATE_ready, TASKSTATE_blocked };
+
+struct task_struct {
+  uint32_t          pid;
+  enum task_state_t state;
+  struct regs       registers;
+  unsigned int      address_base;
+  char             *allocd_addr;
+  char             *process_name;
+};
+
+extern struct task_struct process_table[MAX_PROCESSES];
+extern uint32_t           current_pid;
+
+void init_process_table();
+void start_process(char *, char *);
+void process_debug();
+void schedule(struct regs *);

kernel/spin_lock.c

@@ -1,9 +0,0 @@
-#pragma once
-
-#ifdef ARCH_I386
-#include "../arch/i386/asm.c"
-#endif
-
-void sl_acquire(uint32_t *lock) { __sl_acquire(lock); }
-
-void sl_release(uint32_t *lock) { __sl_release(lock); }

kernel/spin_lock.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#ifdef ARCH_I386
+#include "../arch/i386/asm/asm.h"
+#endif
+
+static inline void sl_acquire(uint32_t *lock) { __sl_acquire(lock); }
+
+static inline void sl_release(uint32_t *lock) { __sl_release(lock); }

kernel/syscall.c

@@ -1,145 +0,0 @@
-#pragma once
-
-#include "scheduler.c"
-#include "ps2.c"
-#include "pci.c"
-#include "vga.c"
-
-#ifdef ARCH_I386
-#include "../arch/i386/syscall.c"
-#endif
-
-enum syscall_type_d { SYSCALL_yield, SYSCALL_getc, SYSCALL_exit, SYSCALL_lspci, SYSCALL_lsproc };
-
-void yield() { INVOKE_SYSCALL(SYSCALL_yield); }
-char getc() { 
-    INVOKE_SYSCALL(SYSCALL_getc); 
-
-    char result;
-    __asm__ volatile (
-        "movb %%al, %0"  
-        : "=r"(result)  
-    );
-
-    return result;
-}
-uint32_t lspci(struct pci_device* devlist, uint32_t len) {
-    int result = 0;
-    __asm__ volatile (
-        "movl %0, %%ebx"  
-        : : "r"((uint32_t) devlist)  : "%ebx"
-    );
-
-    __asm__ volatile (
-        "movl %0, %%ecx"  
-        : : "r"(len)  : "%ecx"
-    );
-
-    
-    INVOKE_SYSCALL(SYSCALL_lspci);
-
-    __asm__ volatile (
-        "movl %%eax, %k0"  
-        : "=r"(result)  
-    );
-
-
-    return result;
-}
-
-uint32_t lsproc(struct task_struct* proclist, uint32_t len) {
-    int result = 0;
-    __asm__ volatile (
-        "movl %0, %%ebx"  
-        : : "r"((uint32_t) proclist)  : "%ebx"
-    );
-
-    __asm__ volatile (
-        "movl %0, %%ecx"  
-        : : "r"(len)  : "%ecx"
-    );
-
-    
-    INVOKE_SYSCALL(SYSCALL_lsproc);
-
-    __asm__ volatile (
-        "movl %%eax, %k0"  
-        : "=r"(result)  
-    );
-
-
-    return result;
-}
-
-void __syscall_yield(struct regs *r) {
-  // for now, just reschedule
-  // TODO: reset PIT timer so
-  // next process doesn't get an
-  // unreasonably small quantum
-
-  schedule(r);
-}
-
-void syscall(struct regs *r) {
-  int syscall_no = r->eax;
-
-  switch (syscall_no) {
-
-  case SYSCALL_yield: {
-    __syscall_yield(r);
-    break;
-  };
-
-  case SYSCALL_getc: {
-    process_table[current_pid].state = TASKSTATE_blocked;
-
-    for(uint32_t i = 0; i < MAX_PROCESSES; i++) {
-        if(!ps2_waiters[i].alloc) {
-            ps2_waiters[i].alloc = 1;
-            ps2_waiters[i].pid = current_pid;
-            break;
-        }
-    }
-
-    __syscall_yield(r);
-    break;
-  };
-
-  case SYSCALL_lspci: {
-    uint32_t len = r->ecx;
-    len = len < pci_devices_count ? len : pci_devices_count;
-    struct pci_device* devlist = (struct pci_device*) r->ebx;
-
-    for (uint32_t i = 0; i < len;  ++i) {
-        devlist[i] = pci_devices_list[i];
-    }
-
-    r->eax = len;
-
-    break;
-  };
-  
-  case SYSCALL_lsproc: {
-    uint32_t len = r->ecx;
-    struct task_struct*proclist = (struct task_struct*) r->ebx;
-
-    uint32_t i = 0, j = 0;
-    for (; i < len;  ++i, ++j) {
-        for(; j < MAX_PROCESSES && process_table[j].state == TASKSTATE_unused; ++j) {}
-        if (j == MAX_PROCESSES) break;
-
-        proclist[i] = process_table[j];
-    }
-
-    r->eax = i;
-
-    break;
-  };
-
-  case SYSCALL_exit: {
-    process_table[current_pid].state = TASKSTATE_unused;
-    __syscall_yield(r);
-    break;
-  };
-  }
-}

kernel/syscall/syscall.c

@@ -0,0 +1,149 @@
+#include "./syscall.h"
+#include "../drivers/ps2/ps2.h"
+#include "../io/io.h"
+#include "../pci/pci.h"
+#include "../scheduler/scheduler.h"
+
+#ifdef ARCH_I386
+#include "../../arch/i386/syscall.h"
+#endif
+
+enum syscall_type_d {
+  SYSCALL_yield,
+  SYSCALL_getc,
+  SYSCALL_exit,
+  SYSCALL_lspci,
+  SYSCALL_lsproc,
+  SYSCALL_powerctl
+};
+
+void powerctl(uint32_t power_mode) {
+  // TODO: Add reboot mode when ACPI is done
+  INVOKE_SYSCALL(SYSCALL_powerctl);
+}
+
+void yield() { INVOKE_SYSCALL(SYSCALL_yield); }
+char getc() {
+  INVOKE_SYSCALL(SYSCALL_getc);
+
+  char result;
+  __asm__ volatile("movb %%al, %0" : "=r"(result));
+
+  return result;
+}
+uint32_t lspci(struct pci_device *devlist, uint32_t len) {
+  int result = 0;
+  __asm__ volatile("movl %0, %%ebx" : : "r"((uint32_t)devlist) : "%ebx");
+
+  __asm__ volatile("movl %0, %%ecx" : : "r"(len) : "%ecx");
+
+  INVOKE_SYSCALL(SYSCALL_lspci);
+
+  __asm__ volatile("movl %%eax, %k0" : "=r"(result));
+
+  return result;
+}
+
+uint32_t lsproc(struct task_struct *proclist, uint32_t len) {
+  int result = 0;
+  __asm__ volatile("movl %0, %%ebx" : : "r"((uint32_t)proclist) : "%ebx");
+
+  __asm__ volatile("movl %0, %%ecx" : : "r"(len) : "%ecx");
+
+  INVOKE_SYSCALL(SYSCALL_lsproc);
+
+  __asm__ volatile("movl %%eax, %k0" : "=r"(result));
+
+  return result;
+}
+
+void __syscall_powerctl() {
+  // TODO: Implement properly
+  printf_nolock("Attempting shutdown using hypervisor-specific methods.");
+  printf_nolock("ACPI is not yet supported.");
+  outw(0x604, 0x2000);
+  outw(0x4004, 0x3400);
+  outw(0x600, 0x34);
+  outw(0xB004, 0x2000);
+}
+
+void __syscall_yield(struct regs *r) {
+  // for now, just reschedule
+  // TODO: reset PIT timer so
+  // next process doesn't get an
+  // unreasonably small quantum
+
+  schedule(r);
+}
+
+void syscall(struct regs *r) {
+  int syscall_no = r->eax;
+
+  switch (syscall_no) {
+
+  case SYSCALL_powerctl: {
+    __syscall_powerctl();
+    break;
+  };
+
+  case SYSCALL_yield: {
+    __syscall_yield(r);
+    break;
+  };
+
+  case SYSCALL_getc: {
+    process_table[current_pid].state = TASKSTATE_blocked;
+
+    for (uint32_t i = 0; i < MAX_PROCESSES; i++) {
+      if (!ps2_waiters[i].alloc) {
+        ps2_waiters[i].alloc = 1;
+        ps2_waiters[i].pid = current_pid;
+        break;
+      }
+    }
+
+    __syscall_yield(r);
+    break;
+  };
+
+  case SYSCALL_lspci: {
+    uint32_t len = r->ecx;
+    len = len < pci_devices_count ? len : pci_devices_count;
+    struct pci_device *devlist = (struct pci_device *)r->ebx;
+
+    for (uint32_t i = 0; i < len; ++i) {
+      devlist[i] = pci_devices_list[i];
+    }
+
+    r->eax = len;
+
+    break;
+  };
+
+  case SYSCALL_lsproc: {
+    uint32_t            len = r->ecx;
+    struct task_struct *proclist = (struct task_struct *)r->ebx;
+
+    uint32_t i = 0, j = 0;
+    for (; i < len; ++i, ++j) {
+      for (; j < MAX_PROCESSES && process_table[j].state == TASKSTATE_unused;
+           ++j) {
+      }
+      if (j == MAX_PROCESSES)
+        break;
+
+      proclist[i] = process_table[j];
+    }
+
+    r->eax = i;
+
+    break;
+  };
+
+  case SYSCALL_exit: {
+    process_table[current_pid].state = TASKSTATE_unused;
+    __syscall_yield(r);
+    break;
+  };
+  }
+}

kernel/syscall/syscall.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <stdint.h>
+
+#define POWERCTL_shutdown (0)
+#define POWERCTL_reboot (1)
+
+void     powerctl(uint32_t);
+char     getc();
+uint32_t lspci();
+uint32_t lsproc();
+void     yield();

kernel/test_processes.c

@@ -1,133 +0,0 @@
-/*
- * Since RAZZLE doesn't have disk support yet, all code for test processes are 
- * included in this file.
- */
-
-#pragma once
-
-#include "./scheduler.c"
-#include "./spin_lock.c"
-#include "./syscall.c"
-#include "./scheduler.c"
-
-uint32_t lock2 = 0;
-
-uint32_t counter;
-
-void test_razzle() {
-    sl_acquire(&lock2);
-    counter = 0;
-    sl_release(&lock2);
-  for (;;) {
-    sl_acquire(&lock2);
-    counter++;
-    //row = 1;
-    //col = 0;
-    //printf("%s (pid %d): %u \n", process_table[current_pid].process_name,
-    //       current_pid, i);
-    sl_release(&lock2);
-    yield();
-  }
-}
-
-void sh_cpuid() {
-    char model[13];
-    uint32_t res[3];
-    __asm__ volatile ("mov $0, %%eax; cpuid; mov %%ebx, %0; mov %%edx, %1; mov %%ecx, %2;" : "=r" (res[0]), "=r" (res[1]), "=r" (res[2]) ::"ebx", "ecx", "edx");
-    for(uint32_t i = 0; i < 3; i++) {
-        model[(i*4) + 0] = (res[i] >> 0) & 0xFF;
-        model[(i*4) + 1] = (res[i] >> 8) & 0xFF;
-        model[(i*4) + 2] = (res[i] >> 16) & 0xFF;
-        model[(i*4) + 3] = (res[i] >> 24) & 0xFF;
-    }
-    model[12] = '\0';
-    printf("%s\n", model);
-}
-
-void sh_lspci() {
-    struct pci_device devlist[7];
-    int devices = lspci(&devlist[0], 7);
-    for(int j = 0; j < devices; ++j) {
-        printf("%s %s (%d %d)\n", devlist[j].vendor_name, devlist[j].device_name, devlist[j].class_code, devlist[j].subclass_code);
-        printf("Device ID: %x\n", devlist[j].device_id);
-        printf("Vendor ID: %x\n", devlist[j].vendor_id);
-        printf("Bar 5    : %x %u\n\n", devlist[j].bar[5], devlist[j].bar[5]);
-    }
-}
-
-void sh_lsproc() {
-    struct task_struct proclist[7];
-    int procs = lsproc(&proclist[0], 7);
-    for(int j = 0; j < procs; ++j) {
-        switch (proclist[j].state) {
-            case TASKSTATE_ready:
-                printf("R");
-                break;
-            case TASKSTATE_blocked:
-                printf("B");
-                break;
-            default:
-                printf("?");
-                break;
-        }
-        printf(" %d: %s", proclist[j].pid, proclist[j].process_name);
-        printf("\n");
-    }
-}
-
-void test_dazzle() {
-  char prompt[] = "you@razzle ~$ ";
-  char command[2048];
-
-  printf("%s", prompt);
-  uint32_t i = 0;
-
-  for (;;) {
-    char c = getc();
-    sl_acquire(&lock2);
-    
-    switch(c) {
-        case '\b':
-            command[i--] = '\0';
-            printf("\b \b");
-            break;
-        
-        case '\n':
-            command[i] = '\0';
-            i = 0;
-
-            printf("\n");
-
-            if (streq(command, "lspci")) {
-                sh_lspci();
-            } else if (streq(command, "cpuid")) {
-                sh_cpuid();
-            } else if (streq(command, "help")) {
-                printf("dazzle, the shell for RAZZLE\n");
-                printf("--------------------------------------------------------\n");
-                printf("help    : print this menu\n");
-                printf("cpuid   : print CPU vendor id string\n");
-                printf("lspci   : print list of PCI devices\n");
-                printf("lsproc  : print list of running processes\n");
-                printf("counter : print counter maintained by background process\n");
-            } else if (streq(command, "counter")) {
-                printf("%d\n", counter);
-            } else if (streq(command, "lsproc")) {
-                sh_lsproc();
-            } else {
-                printf("Unknown command\n");
-            }
-
-            printf("%s", prompt);
-            break;
-
-        default: 
-            printf("%c", c);
-            command[i++] = c;
-            break;
-    }
-
-    sl_release(&lock2);
-    yield();
-  }
-}

shell.nix

@@ -6,5 +6,6 @@ in
     nativeBuildInputs = [ 
         pkgs.cdrkit
         pkgs.qemu
+        pkgs.xxd
     ];
 }

supp/test_processes.c

@@ -0,0 +1,145 @@
+/*
+ * Since RAZZLE doesn't have disk support yet, all code for test processes are
+ * included in this file.
+ */
+
+#pragma once
+
+#include "../kernel/io/io.h"
+#include "../kernel/memory/memory.h"
+#include "../kernel/pci/pci.h"
+#include "../kernel/scheduler/scheduler.h"
+#include "../kernel/spin_lock.h"
+#include "../kernel/syscall/syscall.h"
+
+uint32_t lock2 = 0;
+
+uint32_t counter;
+
+void test_razzle() {
+  sl_acquire(&lock2);
+  counter = 0;
+  sl_release(&lock2);
+  for (;;) {
+    sl_acquire(&lock2);
+    counter++;
+    // row = 1;
+    // col = 0;
+    // printf("%s (pid %d): %u \n", process_table[current_pid].process_name,
+    //        current_pid, i);
+    sl_release(&lock2);
+    yield();
+  }
+}
+
+void sh_cpuid() {
+  char     model[13];
+  uint32_t res[3];
+  __asm__ volatile(
+      "mov $0, %%eax; cpuid; mov %%ebx, %0; mov %%edx, %1; mov %%ecx, %2;"
+      : "=r"(res[0]), "=r"(res[1]), "=r"(res[2])::"ebx", "ecx", "edx");
+  for (uint32_t i = 0; i < 3; i++) {
+    model[(i * 4) + 0] = (res[i] >> 0) & 0xFF;
+    model[(i * 4) + 1] = (res[i] >> 8) & 0xFF;
+    model[(i * 4) + 2] = (res[i] >> 16) & 0xFF;
+    model[(i * 4) + 3] = (res[i] >> 24) & 0xFF;
+  }
+  model[12] = '\0';
+  printf("%s\n", model);
+}
+
+void sh_lspci() {
+  struct pci_device devlist[7];
+  int               devices = lspci(&devlist[0], 7);
+  for (int j = 0; j < devices; ++j) {
+    printf("%s %s (%d %d)\n", devlist[j].vendor_name, devlist[j].device_name,
+           devlist[j].class_code, devlist[j].subclass_code);
+    printf("Device ID: %x\n", devlist[j].device_id);
+    printf("Vendor ID: %x\n", devlist[j].vendor_id);
+    printf("Bar 5    : %x %u\n\n", devlist[j].bar[5], devlist[j].bar[5]);
+  }
+}
+
+void sh_lsproc() {
+  struct task_struct proclist[7];
+  int                procs = lsproc(&proclist[0], 7);
+  for (int j = 0; j < procs; ++j) {
+    switch (proclist[j].state) {
+    case TASKSTATE_ready:
+      printf("R");
+      break;
+    case TASKSTATE_blocked:
+      printf("B");
+      break;
+    default:
+      printf("?");
+      break;
+    }
+    printf(" %d: %s", proclist[j].pid, proclist[j].process_name);
+    printf("\n");
+  }
+}
+
+void test_dazzle() {
+  char prompt[] = "you@razzle ~$ ";
+  char command[2048];
+
+  printf("%s", prompt);
+  uint32_t i = 0;
+
+  for (;;) {
+    char c = getc();
+    sl_acquire(&lock2);
+
+    switch (c) {
+    case '\b':
+      if (i == 0)
+        break;
+      command[i--] = '\0';
+      printf("\b \b");
+      break;
+
+    case '\n':
+      command[i] = '\0';
+      i = 0;
+
+      printf("\n");
+
+      if (streq(command, "lspci")) {
+        sh_lspci();
+      } else if (streq(command, "cpuid")) {
+        sh_cpuid();
+      } else if (streq(command, "help")) {
+        printf("dazzle, the shell for RAZZLE\n");
+        printf("--------------------------------------------------------\n");
+        printf("help    : print this menu\n");
+        printf("cpuid   : print CPU vendor id string\n");
+        printf("lspci   : print list of PCI devices\n");
+        printf("lsproc  : print list of running processes\n");
+        printf("counter : print counter maintained by background process\n");
+        printf("shutdown:  shuts down the VM using VM-specific methods\n");
+      } else if (streq(command, "counter")) {
+        printf("%d\n", counter);
+      } else if (streq(command, "lsproc")) {
+        sh_lsproc();
+      } else if (streq(command, "shutdown")) {
+        powerctl(POWERCTL_shutdown);
+        printf("If the computer is still on, you must manually power it off. "
+               "ACPI is not yet implemented.\n");
+      } else {
+        printf("Unknown command\n");
+      }
+
+      printf("%s", prompt);
+      break;
+
+    default:
+      printf("%c", c);
+      command[i++] = c;
+      break;
+    }
+
+    sl_release(&lock2);
+    yield();
+  }
+}