got grub memory map and added to kernel printf

10 files changed, 463 insertions, 32 deletions

diff --git a/.gitignore b/.gitignore
index 2c19c1b..b20cc07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,11 +1,13 @@
 # directories that have to exist but shouldn't be added to git

 isodir/

 sysroot/

+build/

 

 # compiled files files

 *.bin

 *.iso

 *.o

+*.d

 

 # i have no idea what this is for

 bx_enh_dbg.ini

diff --git a/bochsrc.bxrc b/bochsrc.bxrc
index 5dae11f..6bc50da 100644
--- a/bochsrc.bxrc
+++ b/bochsrc.bxrc
@@ -3,7 +3,7 @@ boot: cdrom
 

 megs: 256

 

-#display_library: win32, options="gui_debug"

+display_library: win32, options="gui_debug"

 

 vga: extension=vbe

 

diff --git a/kernel/arch/i386/boot.asm b/kernel/arch/i386/boot.asm
index a2dccce..b5dfe11 100644
--- a/kernel/arch/i386/boot.asm
+++ b/kernel/arch/i386/boot.asm
@@ -30,6 +30,12 @@ _start:
     ; setup stack

     mov esp, stack_top

 

+    ; get multiboot header data (for memory map)

+    extern multiboot_main

+    push eax

+    push ebx

+    call multiboot_main

+

     extern _init

     call _init

 

diff --git a/kernel/arch/i386/multiboot.cpp b/kernel/arch/i386/multiboot.cpp
new file mode 100644
index 0000000..4ce94df
--- /dev/null
+++ b/kernel/arch/i386/multiboot.cpp
@@ -0,0 +1,29 @@
+#include <stdint.h>

+#include <stdio.h>

+#include <stdlib.h>

+#include "multiboot.h"

+#include <arch/i386/tmtty.h>

+

+// gets the memory map and stuff

+extern "C" void multiboot_main(multiboot_info_t* mbd, uint32_t magic) {

+    terminal_initialize();

+    if (magic != MULTIBOOT_BOOTLOADER_MAGIC) {

+        printf("Invalid multiboot magic number\n");

+        abort();

+    }

+

+    // checks bit 6 to see if there's a valid memory map

+    if (!(mbd->flags >> 6 & 0x1)) {

+        printf("Invalid GRUB memory map\n");

+        abort();

+    }

+

+    // loop through memory map and display the values

+    for (int i = 0; i < mbd->mmap_length; i += sizeof(multiboot_memory_map_t)) {

+        multiboot_memory_map_t* mmmt = (multiboot_memory_map_t*)(mbd->mmap_addr + i);

+

+        printf("Start Addr: 0x%lx | Length: 0x%lx | Size: 0x%x | Type: %d\n", 

+        mmmt->addr, mmmt->len, mmmt->size, mmmt->type);

+        //printf("%lx,%x,%x,%d\n", mmmt->size, mmmt->size, mmmt->size, mmmt->size);

+    }

+}
\ No newline at end of file
diff --git a/kernel/arch/i386/multiboot.h b/kernel/arch/i386/multiboot.h
new file mode 100644
index 0000000..0951ebe
--- /dev/null
+++ b/kernel/arch/i386/multiboot.h
@@ -0,0 +1,274 @@
+/* multiboot.h - Multiboot header file. */

+/* Copyright (C) 1999,2003,2007,2008,2009,2010  Free Software Foundation, Inc.

+ *

+ *  Permission is hereby granted, free of charge, to any person obtaining a copy

+ *  of this software and associated documentation files (the "Software"), to

+ *  deal in the Software without restriction, including without limitation the

+ *  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

+ *  sell copies of the Software, and to permit persons to whom the Software is

+ *  furnished to do so, subject to the following conditions:

+ *

+ *  The above copyright notice and this permission notice shall be included in

+ *  all copies or substantial portions of the Software.

+ *

+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL ANY

+ *  DEVELOPER OR DISTRIBUTOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

+ *  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR

+ *  IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

+ */

+

+#ifndef MULTIBOOT_HEADER

+#define MULTIBOOT_HEADER 1

+

+/* How many bytes from the start of the file we search for the header. */

+#define MULTIBOOT_SEARCH                        8192

+#define MULTIBOOT_HEADER_ALIGN                  4

+

+/* The magic field should contain this. */

+#define MULTIBOOT_HEADER_MAGIC                  0x1BADB002

+

+/* This should be in %eax. */

+#define MULTIBOOT_BOOTLOADER_MAGIC              0x2BADB002

+

+/* Alignment of multiboot modules. */

+#define MULTIBOOT_MOD_ALIGN                     0x00001000

+

+/* Alignment of the multiboot info structure. */

+#define MULTIBOOT_INFO_ALIGN                    0x00000004

+

+/* Flags set in the ’flags’ member of the multiboot header. */

+

+/* Align all boot modules on i386 page (4KB) boundaries. */

+#define MULTIBOOT_PAGE_ALIGN                    0x00000001

+

+/* Must pass memory information to OS. */

+#define MULTIBOOT_MEMORY_INFO                   0x00000002

+

+/* Must pass video information to OS. */

+#define MULTIBOOT_VIDEO_MODE                    0x00000004

+

+/* This flag indicates the use of the address fields in the header. */

+#define MULTIBOOT_AOUT_KLUDGE                   0x00010000

+

+/* Flags to be set in the ’flags’ member of the multiboot info structure. */

+

+/* is there basic lower/upper memory information? */

+#define MULTIBOOT_INFO_MEMORY                   0x00000001

+/* is there a boot device set? */

+#define MULTIBOOT_INFO_BOOTDEV                  0x00000002

+/* is the command-line defined? */

+#define MULTIBOOT_INFO_CMDLINE                  0x00000004

+/* are there modules to do something with? */

+#define MULTIBOOT_INFO_MODS                     0x00000008

+

+/* These next two are mutually exclusive */

+

+/* is there a symbol table loaded? */

+#define MULTIBOOT_INFO_AOUT_SYMS                0x00000010

+/* is there an ELF section header table? */

+#define MULTIBOOT_INFO_ELF_SHDR                 0X00000020

+

+/* is there a full memory map? */

+#define MULTIBOOT_INFO_MEM_MAP                  0x00000040

+

+/* Is there drive info? */

+#define MULTIBOOT_INFO_DRIVE_INFO               0x00000080

+

+/* Is there a config table? */

+#define MULTIBOOT_INFO_CONFIG_TABLE             0x00000100

+

+/* Is there a boot loader name? */

+#define MULTIBOOT_INFO_BOOT_LOADER_NAME         0x00000200

+

+/* Is there a APM table? */

+#define MULTIBOOT_INFO_APM_TABLE                0x00000400

+

+/* Is there video information? */

+#define MULTIBOOT_INFO_VBE_INFO                 0x00000800

+#define MULTIBOOT_INFO_FRAMEBUFFER_INFO         0x00001000

+

+#ifndef ASM_FILE

+

+typedef unsigned char           multiboot_uint8_t;

+typedef unsigned short          multiboot_uint16_t;

+typedef unsigned int            multiboot_uint32_t;

+typedef unsigned long long      multiboot_uint64_t;

+

+struct multiboot_header

+{

+  /* Must be MULTIBOOT_MAGIC - see above. */

+  multiboot_uint32_t magic;

+

+  /* Feature flags. */

+  multiboot_uint32_t flags;

+

+  /* The above fields plus this one must equal 0 mod 2^32. */

+  multiboot_uint32_t checksum;

+

+  /* These are only valid if MULTIBOOT_AOUT_KLUDGE is set. */

+  multiboot_uint32_t header_addr;

+  multiboot_uint32_t load_addr;

+  multiboot_uint32_t load_end_addr;

+  multiboot_uint32_t bss_end_addr;

+  multiboot_uint32_t entry_addr;

+

+  /* These are only valid if MULTIBOOT_VIDEO_MODE is set. */

+  multiboot_uint32_t mode_type;

+  multiboot_uint32_t width;

+  multiboot_uint32_t height;

+  multiboot_uint32_t depth;

+};

+

+/* The symbol table for a.out. */

+struct multiboot_aout_symbol_table

+{

+  multiboot_uint32_t tabsize;

+  multiboot_uint32_t strsize;

+  multiboot_uint32_t addr;

+  multiboot_uint32_t reserved;

+};

+typedef struct multiboot_aout_symbol_table multiboot_aout_symbol_table_t;

+

+/* The section header table for ELF. */

+struct multiboot_elf_section_header_table

+{

+  multiboot_uint32_t num;

+  multiboot_uint32_t size;

+  multiboot_uint32_t addr;

+  multiboot_uint32_t shndx;

+};

+typedef struct multiboot_elf_section_header_table multiboot_elf_section_header_table_t;

+

+struct multiboot_info

+{

+  /* Multiboot info version number */

+  multiboot_uint32_t flags;

+

+  /* Available memory from BIOS */

+  multiboot_uint32_t mem_lower;

+  multiboot_uint32_t mem_upper;

+

+  /* "root" partition */

+  multiboot_uint32_t boot_device;

+

+  /* Kernel command line */

+  multiboot_uint32_t cmdline;

+

+  /* Boot-Module list */

+  multiboot_uint32_t mods_count;

+  multiboot_uint32_t mods_addr;

+

+  union

+  {

+    multiboot_aout_symbol_table_t aout_sym;

+    multiboot_elf_section_header_table_t elf_sec;

+  } u;

+

+  /* Memory Mapping buffer */

+  multiboot_uint32_t mmap_length;

+  multiboot_uint32_t mmap_addr;

+

+  /* Drive Info buffer */

+  multiboot_uint32_t drives_length;

+  multiboot_uint32_t drives_addr;

+

+  /* ROM configuration table */

+  multiboot_uint32_t config_table;

+

+  /* Boot Loader Name */

+  multiboot_uint32_t boot_loader_name;

+

+  /* APM table */

+  multiboot_uint32_t apm_table;

+

+  /* Video */

+  multiboot_uint32_t vbe_control_info;

+  multiboot_uint32_t vbe_mode_info;

+  multiboot_uint16_t vbe_mode;

+  multiboot_uint16_t vbe_interface_seg;

+  multiboot_uint16_t vbe_interface_off;

+  multiboot_uint16_t vbe_interface_len;

+

+  multiboot_uint64_t framebuffer_addr;

+  multiboot_uint32_t framebuffer_pitch;

+  multiboot_uint32_t framebuffer_width;

+  multiboot_uint32_t framebuffer_height;

+  multiboot_uint8_t framebuffer_bpp;

+#define MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED 0

+#define MULTIBOOT_FRAMEBUFFER_TYPE_RGB     1

+#define MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT     2

+  multiboot_uint8_t framebuffer_type;

+  union

+  {

+    struct

+    {

+      multiboot_uint32_t framebuffer_palette_addr;

+      multiboot_uint16_t framebuffer_palette_num_colors;

+    };

+    struct

+    {

+      multiboot_uint8_t framebuffer_red_field_position;

+      multiboot_uint8_t framebuffer_red_mask_size;

+      multiboot_uint8_t framebuffer_green_field_position;

+      multiboot_uint8_t framebuffer_green_mask_size;

+      multiboot_uint8_t framebuffer_blue_field_position;

+      multiboot_uint8_t framebuffer_blue_mask_size;

+    };

+  };

+};

+typedef struct multiboot_info multiboot_info_t;

+

+struct multiboot_color

+{

+  multiboot_uint8_t red;

+  multiboot_uint8_t green;

+  multiboot_uint8_t blue;

+};

+

+struct multiboot_mmap_entry

+{

+  multiboot_uint32_t size;

+  multiboot_uint64_t addr;

+  multiboot_uint64_t len;

+#define MULTIBOOT_MEMORY_AVAILABLE              1

+#define MULTIBOOT_MEMORY_RESERVED               2

+#define MULTIBOOT_MEMORY_ACPI_RECLAIMABLE       3

+#define MULTIBOOT_MEMORY_NVS                    4

+#define MULTIBOOT_MEMORY_BADRAM                 5

+  multiboot_uint32_t type;

+} __attribute__((packed));

+typedef struct multiboot_mmap_entry multiboot_memory_map_t;

+

+struct multiboot_mod_list

+{

+  /* the memory used goes from bytes ’mod_start’ to ’mod_end-1’ inclusive */

+  multiboot_uint32_t mod_start;

+  multiboot_uint32_t mod_end;

+

+  /* Module command line */

+  multiboot_uint32_t cmdline;

+

+  /* padding to take it to 16 bytes (must be zero) */

+  multiboot_uint32_t pad;

+};

+typedef struct multiboot_mod_list multiboot_module_t;

+

+/* APM BIOS info. */

+struct multiboot_apm_info

+{

+  multiboot_uint16_t version;

+  multiboot_uint16_t cseg;

+  multiboot_uint32_t offset;

+  multiboot_uint16_t cseg_16;

+  multiboot_uint16_t dseg;

+  multiboot_uint16_t flags;

+  multiboot_uint16_t cseg_len;

+  multiboot_uint16_t cseg_16_len;

+  multiboot_uint16_t dseg_len;

+};

+

+#endif /* ! ASM_FILE */

+

+#endif /* ! MULTIBOOT_HEADER */
\ No newline at end of file
diff --git a/kernel/arch/i386/tmtty.cpp b/kernel/arch/i386/tmtty.cpp
index 06eb578..d4dc772 100644
--- a/kernel/arch/i386/tmtty.cpp
+++ b/kernel/arch/i386/tmtty.cpp
@@ -10,17 +10,16 @@
 

 static const size_t VGA_WIDTH = 80;

 static const size_t VGA_HEIGHT = 25;

+static uint16_t* const VGA_MEMORY = (uint16_t*) 0xB8000;

 

 size_t terminal_row;

 size_t terminal_column;

 uint8_t terminal_color;

 uint16_t* terminal_buffer;

 

-void terminal_initialize(void) {

+void terminal_clear(void) {

     terminal_row = 0;

     terminal_column = 0;

-    terminal_color = vga_entry_color(VGA_COLOR_WHITE, VGA_COLOR_BLACK);

-    terminal_buffer = (uint16_t*) 0xB8000;

     for (size_t y = 0; y < VGA_HEIGHT; y++) {

         for (size_t x = 0; x < VGA_WIDTH; x++) {

             const size_t i = y * VGA_WIDTH + x;

@@ -29,15 +28,10 @@ void terminal_initialize(void) {
     }

 }

 

-void terminal_clear(void) {

-    terminal_row = 0;

-    terminal_column = 0;

-    for (size_t y = 0; y < VGA_HEIGHT; y++) {

-        for (size_t x = 0; x < VGA_WIDTH; x++) {

-            const size_t i = y * VGA_WIDTH + x;

-            terminal_buffer[i] = vga_entry(' ', terminal_color);

-        }

-    }

+void terminal_initialize(void) {

+    terminal_color = vga_entry_color(VGA_COLOR_WHITE, VGA_COLOR_BLACK);

+    terminal_buffer = VGA_MEMORY;

+    terminal_clear();

 }

 

 void terminal_setcolor(uint8_t color) {

@@ -49,18 +43,26 @@ void terminal_putentryat(char c, uint8_t color, size_t x, size_t y) {
     terminal_buffer[i] = vga_entry(c, color);

 }

 

+void terminal_scroll() {

+    memmove(VGA_MEMORY, (VGA_MEMORY + VGA_WIDTH), (VGA_HEIGHT * VGA_WIDTH) - VGA_WIDTH);

+	memset(VGA_MEMORY + (VGA_WIDTH * VGA_HEIGHT) - VGA_WIDTH, 0x0, VGA_WIDTH * 2);

+	--terminal_row;

+}

+

 void terminal_putchar(char c) {

-    if (c == '\n') {

+    unsigned char uc = c;

+    if (uc == '\n') {

         terminal_column = 0;

-        ++terminal_row;

+        if (terminal_row++ == VGA_HEIGHT)

+			terminal_scroll();

         return;

     }

-    terminal_putentryat(c, terminal_color, terminal_column, terminal_row);

+    terminal_putentryat(uc, terminal_color, terminal_column, terminal_row);

     

     if (++terminal_column == VGA_WIDTH) {

         terminal_column = 0;

         if (++terminal_row == VGA_HEIGHT) {

-            terminal_row = 0;

+            terminal_scroll();

         }

     }

 }

diff --git a/kernel/kernel.cpp b/kernel/kernel.cpp
index c22647b..579e642 100644
--- a/kernel/kernel.cpp
+++ b/kernel/kernel.cpp
@@ -18,12 +18,13 @@
 

 extern "C" void kernel_main(void) {

     // Initialize terminal

-    terminal_initialize();

+    //terminal_initialize();

 

-    initialize_ps2_controller();

-    keyboard_init();

+    //initialize_ps2_controller();

+    //keyboard_init();

 

     printf("Hello world!\n");

-    printf("among");

+    printf("among\n");

     printf("balls\n");

+    printf("a%db", 1);

 }
\ No newline at end of file
diff --git a/kernel/makefile b/kernel/makefile
index c1aa57f..6c563b8 100644
--- a/kernel/makefile
+++ b/kernel/makefile
@@ -44,6 +44,9 @@ OBJECTS := $(patsubst %.c,%.o,$(C_SOURCES))
 OBJECTS += $(patsubst %.cpp,%.o,$(CPP_SOURCES))

 OBJECTS += $(patsubst %.asm,%.o,$(ASMFILES))

 

+DEPFILES := $(patsubst %.c,%.d,$(SRCFILES))

+DEPFILES += $(patsubst %.cpp,%.d,$(SRCFILES))

+

 LINKLST := crti.o

 LINKLST += $(CRTBEGIN)

 LINKLST += $(OBJECTS)

@@ -51,6 +54,8 @@ LINKLST += $(LIBS)
 LINKLST += $(CRTEND)

 LINKLST += crtn.o

 

+-include $(DEPFILES)

+

 .PHONY: all crt clean

 

 all: crti.o crtn.o kernel.bin

@@ -61,11 +66,11 @@ kernel.bin: ${OBJECTS}
 

 %.o: %.cpp

 	$(info [INFO] Compiling $<)

-	$(CXX) ${CXXFLAGS} -c $< -o $@

+	$(CXX) ${CXXFLAGS} -MMD -MP -c $< -o $@

 

 %.o: %.c

 	$(info [INFO] Compiling $<)

-	$(CC) $(CFLAGS) -c $< -o $@

+	$(CC) $(CFLAGS) -MMD -MP -c $< -o $@

 

 %.o: %.asm

 	$(info [INFO] Assembling $<)

@@ -78,8 +83,8 @@ crtn.o:
 	$(NASM) arch/$(ARCH)/crtn.asm -felf32 -o $@

 

 install-headers:

-	cp -r --preserve=timestamps include $(SYSROOT)/usr/include

+	cp -r --preserve=timestamps include/. $(SYSROOT)/usr/include

 

 clean:

 	$(info [INFO] Cleaning)

-	rm ${OBJECTS} crti.o crtn.o
\ No newline at end of file
+	rm ${OBJECTS} ${DEPFILES} crti.o crtn.o
\ No newline at end of file
diff --git a/kernel/std/printf.c b/kernel/std/printf.c
index c383cad..fe45892 100644
--- a/kernel/std/printf.c
+++ b/kernel/std/printf.c
@@ -3,7 +3,8 @@
 #include <stdarg.h>

 #include <stdio.h>

 #include <string.h>

- 

+#include <stdint.h>

+

 static bool print(const char* data, size_t length) {

 	const unsigned char* bytes = (const unsigned char*) data;

 	for (size_t i = 0; i < length; i++)

@@ -11,13 +12,82 @@ static bool print(const char* data, size_t length) {
 			return false;

 	return true;

 }

- 

+

+// for %d and %x.

+static const char* itoa(unsigned int num, char* str, unsigned int base) {

+	asm("xchgw %bx, %bx");

+	int cou = 0; // nt

+

+    if (num == 0) { // 0

+		str[cou] = '0';

+		str[++cou] = '\0';

+		return str;

+	}

+

+	while (num)

+	{

+		unsigned int rem = (num % base);

+		// brings the number up to ascii 0 + the digit

+		if (rem > 9) {

+			str[cou] = rem + '7'; // 7 = 55 + 10(A) = 65

+		} else {

+			str[cou] = rem + '0';

+		}

+		num /= base;

+		++cou;

+	}

+	

+	// reverse the string

+	for (int i = 0; i < cou; i++) {

+		char temp = str[i];

+		str[i] = str[cou - i - 1]; 

+		str[cou - 1] = temp;

+	}

+

+	str[cou] = '\0';

+	return str;

+}

+

+// have no idea if there's a better way to do this. for %lx

+static const char* itoa_u64(unsigned long long num, char* str, int base) {

+	int cou = 0; // nt

+

+    if (num == 0) { // 0

+		str[cou] = '0';

+		str[++cou] = '\0';

+		return str;

+	}

+

+	while (num)

+	{

+		unsigned long long rem = num % base;

+		// brings the number up to ascii 0 + the digit

+		if (rem > 9) {

+			str[cou] = rem + '7'; // 7 = 55 + 10(A) = 65

+		} else {

+			str[cou] = rem + '0';

+		}

+		num /= base;

+		++cou;

+	}

+	

+	// reverse the string

+	for (int i = 0; i < cou; i++) {

+		char temp = str[i];

+		str[i] = str[cou - i - 1]; 

+		str[cou - 1] = temp;

+	}

+

+	str[cou] = '\0';

+	return str;

+}

+

 int printf(const char* restrict format, ...) {

 	va_list parameters;

 	va_start(parameters, format);

  

 	int written = 0;

- 

+

 	while (*format != '\0') {

 		size_t maxrem = INT_MAX - written;

  

@@ -37,9 +107,9 @@ int printf(const char* restrict format, ...) {
 			written += amount;

 			continue;

 		}

- 

+

 		const char* format_begun_at = format++;

- 

+

 		if (*format == 'c') {

 			format++;

 			char c = (char) va_arg(parameters, int /* char promotes to int */);

@@ -50,6 +120,48 @@ int printf(const char* restrict format, ...) {
 			if (!print(&c, sizeof(c)))

 				return -1;

 			written++;

+		} else if (*format == 'd') {

+			format++;

+			char str[20]; // probably a long enough buffer

+			unsigned int d = va_arg(parameters, unsigned int);

+			itoa(d, str, 10);

+			size_t len = strlen(str);

+			if (maxrem < len) {

+				// TODO: Set errno to EOVERFLOW.

+				return -1;

+			}

+			if (!print(str, len))

+				return -1;

+			written += len;

+		} else if (*format == 'x') {

+			format++;

+			char str[20]; // probably a long enough buffer

+			unsigned int d = va_arg(parameters, unsigned int);

+			itoa(d, str, 16);

+			size_t len = strlen(str);

+			if (maxrem < len) {

+				// TODO: Set errno to EOVERFLOW.

+				return -1;

+			}

+			if (!print(str, len))

+				return -1;

+			written += len;

+		} else if (*format == 'l') { // for %lx and others that start with l

+			format++;

+			if (*format == 'x') {

+				format++;

+				char str[20]; // probably a long enough buffer

+				unsigned long long d = va_arg(parameters, unsigned long long);

+				itoa_u64(d, str, 16);

+				size_t len = strlen(str);

+				if (maxrem < len) {

+					// TODO: Set errno to EOVERFLOW.

+					return -1;

+				}

+				if (!print(str, len))

+					return -1;

+				written += len;

+			}

 		} else if (*format == 's') {

 			format++;

 			const char* str = va_arg(parameters, const char*);

@@ -74,7 +186,7 @@ int printf(const char* restrict format, ...) {
 			format += len;

 		}

 	}

- 

+

 	va_end(parameters);

 	return written;

 }
\ No newline at end of file
diff --git a/run-qemu.bat b/run-qemu.bat
index bd1701d..19a5ae8 100644
--- a/run-qemu.bat
+++ b/run-qemu.bat
@@ -1,2 +1,2 @@
 @echo off

-qemu-system-i386 emuos.iso
\ No newline at end of file
+qemu-system-i386 -m 128 -drive format=raw,media=cdrom,file=emuos.iso
\ No newline at end of file