FINALLY FFFFF

SANDHU__OS/Makefile

@@ -0,0 +1,27 @@
+MKDIR_P := mkdir -p
+OUT_DIR := $(PWD)/build
+export TOP_DIR=$(PWD)
+export LIB_DIR=${OUT_DIR}/lib
+export BIN_DIR=${OUT_DIR}/bin
+export ETC_DIR=${OUT_DIR}/etc
+export LD_LIBRARY_PATH:=${LIB_DIR}:$(LD_LIBRARY_PATH)
+
+SUBDIRS = \
+	src
+
+MAKE_UTILS_DIR := $(PWD)/makeUtils
+export MAKE_UTILS_DIR
+
+all: $(OUT_DIR)
+
+$(OUT_DIR):
+	${MKDIR_P} $(LIB_DIR) $(BIN_DIR) $(ETC_DIR)
+
+clean: rmBuild
+
+rmBuild:
+	rm -rf build iso/boot/kernel.elf bochsrc.txt bochslog.txt vivitsa.iso os.iso \
+					.DS_Store com1.out *.o *.so;
+
+# Include Common Makefile
+-include ${MAKE_UTILS_DIR}/Makefile.defs

SANDHU__OS/README.md

@@ -0,0 +1,42 @@
+## Details
+
+Currently this operating system has kernel with interrupt, paging, hea0p,
+virtual file system support and multitasking. Yet to enable support for user
+space applications.
+(More information in Sandbox)
+
+## Usage
+
+### To build project
+
+```shell
+	# -s for make quite
+	$ ./build.sh -s
+```
+
+### To run project
+
+```shell
+	$ ./run.sh
+```
+
+### To build with debug symbols
+
+```shell
+	# -s for make quite, -g for debug
+	$ ./build.sh -s -g
+```
+
+### To run project in debug mode
+
+```shell
+	$ ./run.sh -d
+```
+
+#### Note: Make sure to build with debug symbols
+
+```shell
+	$ gdb or gdbtui
+	$ target remote localhost:1234
+	$ file build/bin/kernel.elf  (loads debugging symbols from the file)
+```

SANDHU__OS/build.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+make $1 clean 
+
+make $1 D=$2 

SANDHU__OS/build/etc/bochsrc.txt

@@ -0,0 +1,10 @@
+megs:            32
+display_library: sdl2
+romimage:        file=/usr/share/bochs/BIOS-bochs-legacy
+vgaromimage:     file=/usr/share/bochs/VGABIOS-lgpl-latest
+ata0-master:     type=cdrom, path=os.iso, status=inserted
+boot:            cdrom
+log:             bochslog.txt
+clock:           sync=realtime, time0=local
+cpu:             count=1, ips=1000000
+com1:            enabled=1, mode=file, dev=sandhu.out

SANDHU__OS/iso/boot/grub/menu.lst

@@ -0,0 +1,6 @@
+    default=0
+    timeout=0
+
+    title os
+    kernel /boot/kernel.elf
+    module /modules/initrd

SANDHU__OS/makeUtils/Makefile.defs

@@ -0,0 +1,19 @@
+.PHONY: all clean install
+
+all: $(SUBDIRS)
+	for subdir in $(SUBDIRS) ; do \
+		make -C $$subdir all || exit 1; \
+	done
+
+clean: $(SUBDIRS) rmOBJS
+	for subdir in $(SUBDIRS) ; do \
+		make -C $$subdir clean ; \
+	done
+
+install: $(SUBDIRS)
+	for subdir in $(SUBDIRS) ; do \
+		make -C $$subdir install || exit 1; \
+	done
+
+rmOBJS:
+	rm -rf .DS_Store *.o *.so *.a *.out

SANDHU__OS/makeUtils/Makefile.include

@@ -0,0 +1,21 @@
+CC = gcc
+
+# Pass gdb debug flag from command line
+# Usage `make D=-g`
+CC += $(D)
+
+CFLAGS += -m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector \
+				 -nostartfiles -nodefaultlibs -Wall -Wextra -Werror
+
+AS = nasm
+ASFLAGS = -f elf
+
+C_SOURCES += $(wildcard *.c)
+S_SOURCES += $(wildcard *.s)
+C_OBJECTS += $(C_SOURCES:.c=.o)
+S_OBJECTS += $(S_SOURCES:.s=.o)
+
+LDFLAGS += \
+	-L$(LIB_DIR) \
+
+INCLUDE += \

SANDHU__OS/qemu.log

@@ -0,0 +1,106 @@
+c[?7lSeaBIOS (version 1.15.0-1)
+
+
+iPXE (https://ipxe.org) 00:03.0 CA00 PCI2.10 PnP PMM+BFF8B4A0+BFECB4A0 CA00
+Press Ctrl-B to configure iPXE (PCI 00:03.0)...                                                                               
+
+
+Booting from Hard Disk...
+Boot failed: could not read the boot disk
+
+Booting from Floppy...
+Boot failed: could not read the boot disk
+
+Booting from DVD/CD...
+Loading stage2 ....
+
+    GNU GRUB  version 0.95  (639K lower / 3144576K upper memory)┌─────────────────────────────────────────────────────────────────────────┐││││││││││││││││││││││││└─────────────────────────────────────────────────────────────────────────┘
+      Use the ↑ and ↓ keys to select which entry is highlighted.
+      Press enter to boot the selected OS, 'e' to edit the
+      commands before booting, or 'c' for a command-line.  os                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Booting 'os'
+
+kernel /boot/kernel.elf
+   [Multiboot-elf, <0x100000:0x498b:0x0>, <0x105000:0x14e0:0x0>, <0x107000:0xa1
+0:0x225c>, shtab=0x10a230, entry=0x100d7c]
+module /modules/initrd
+   [Multiboot-module @ 0x10c000, 0x1349 bytes
+==============================
+Testing COM port... it works!!!
+
+==============================
+Testing Interrupt by raising interrupt 34
+Recieved interrupt 34!!
+
+
+==============================
+Testing paging, trying to access address 
+Testing paging, trying to access address 1155104
+
+Recieved interrupt 14!!
+Page fault! ( ) at address = 1155104
+Creating page at address 1155104
+Out of page fault, page allocation works!!!
+
+==============================
+Testing kernel heap.... 
+==============================
+Testing kernel malloc.... 
+Calling kmalloc() for allocating 8 bytes
+kmalloc() allocated 8 bytes at address: 3221762116
+
+Calling kmalloc() for allocating 10 bytes
+kmalloc() allocated 10 bytes at address: 3221762144
+
+Calling kmalloc() for allocating 8 bytes
+kmalloc() allocated 8 bytes at address: 3221762174
+
+==============================
+Testing kernel free.... 
+Calling kfree() to deallocate address: 3221762116
+
+Calling kmalloc() for allocating 20 bytes
+kmalloc() allocated 20 bytes at address: 3221762202
+
+Calling kmalloc() for allocating 8 bytes
+kmalloc() allocated 8 bytes at address: 3221762116
+
+==============================
+Testing Multiboot...
+Mboot address loaded at 183680
+Initrd loaded at address 1097728
+Multiboot modules end at address 1102665
+Number of modules loaded = 1
+
+==============================
+Testing virtual file system
+reading contents of directory /dev
+
+Found file -> file1.txt
+	 contents: Hello, you just loaded first file from VFS!
+
+
+Found file -> file2.txt
+	 contents: This is the second file!
+
+
+
+==============================
+Testing multitasking
+Calling process fork
+
+
+==============================
+fork() returned 2, and getpid() returned 1
+============================================================================
+
+==============================
+Keyboard Enabled, type something!!!!
+
+
+==============================
+fork() returned 0, and getpid() returned 2
+============================================================================
+
+==============================
+Keyboard Enabled, type something!!!!
+qemu-system-i386: terminating on signal 15 from pid 1902 (/lib/systemd/systemd)

SANDHU__OS/run.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+if [ "$#" -eq 1 ]; then
+  if [ $1 = "-d" ]; then
+    debug="-S";
+    echo "Running in debug mode"
+  else
+    echo " './run.sh -d' to run in debug mode"
+    exit 1
+  fi
+fi
+
+cp build/bin/kernel.elf iso/boot/kernel.elf
+
+genisoimage -R                  \
+-b boot/grub/stage2_eltorito    \
+-no-emul-boot                   \
+-boot-load-size 4               \
+-A os                           \
+-input-charset utf8             \
+-quiet                          \
+-boot-info-table                \
+-o sandhu.iso                  \
+iso
+
+unset GTK_PATH # This is needed to run qemu on my system
+
+qemu-system-i386 -cdrom sandhu.iso -m 4G -s -serial stdio $debug

SANDHU__OS/src/Makefile

@@ -0,0 +1,9 @@
+SUBDIRS = \
+	drivers \
+	mm \
+	utils \
+	kernel \
+
+
+# Include Common Makefile
+-include ${MAKE_UTILS_DIR}/Makefile.defs

SANDHU__OS/src/drivers/Makefile

@@ -0,0 +1,10 @@
+SUBDIRS = \
+	frame_buffer \
+	interrupts \
+	io \
+	keyboard \
+	serial_port \
+	timer
+
+# Include Common Makefile
+-include ${MAKE_UTILS_DIR}/Makefile.defs

SANDHU__OS/src/drivers/frame_buffer/Makefile

@@ -0,0 +1,5 @@
+# Include Common Makefile
+-include ${MAKE_UTILS_DIR}/Makefile.include
+
+# Include Common Makefile
+-include ${MAKE_UTILS_DIR}/Makefile.defs

SANDHU__OS/src/drivers/frame_buffer/frame_buffer.c

@@ -0,0 +1,83 @@
+#include "frame_buffer.h"
+#include <io.h>
+
+static int8_t *fb = (int8_t *)FB_BASE_ADDRESS;
+static uint16_t CURSOR_POS = 0;
+static uint16_t CURSOR_POS_MAX = 2000;
+static uint16_t BACKGROUND_COLOR = FB_GREEN;
+static uint16_t FOREGROUND_COLOR = FB_DARK_GREY;
+
+/* fb_move_cursor:
+ *  Moves the cursor of the framebuffer to the CURSOR_POS global variable
+ */
+void fb_move_cursor() {
+  outb(FB_COMMAND_PORT, FB_HIGH_BYTE_COMMAND);
+  outb(FB_DATA_PORT, ((CURSOR_POS >> 8) & 0x00FF));
+  outb(FB_COMMAND_PORT, FB_LOW_BYTE_COMMAND);
+  outb(FB_DATA_PORT, CURSOR_POS & 0x00FF);
+}
+
+/* fb_clear:
+ *  Clear the contents on screen between start position and end position
+ *
+ *  @param start Starting position
+ *  @param end End position
+ */
+
+void fb_clear(uint16_t start, uint16_t end) {
+  for (uint16_t i = start; i < end; i++) {
+    fb[2 * i] = ' ';
+    fb[2 * i + 1] = ((FB_BLACK & 0x0F) << 4) | (FB_WHITE & 0x0F);
+  }
+}
+
+void fb_clear_all() {
+  fb_clear(0, CURSOR_POS_MAX);
+  CURSOR_POS = 0;
+  fb_move_cursor();
+}
+
+/* fb_write_cell:
+ *  Writes a character with the given foreground and background to position i
+ *  in the framebuffer.
+ *
+ *  @param i  The location in the framebuffer
+ *  @param c  The character
+ *  @param fg The foreground color
+ *  @param bg The background color
+ */
+void fb_write_cell(int8_t c, uint8_t fg, uint8_t bg) {
+  if (c == '\n') {
+    uint16_t cursor_temp_pos = CURSOR_POS;
+    CURSOR_POS = ((CURSOR_POS / 79) + 1) * 80;
+    if (CURSOR_POS >= CURSOR_POS_MAX) {
+      fb_clear(0, CURSOR_POS_MAX);
+      CURSOR_POS = 0;
+    } else {
+      fb_clear(cursor_temp_pos, CURSOR_POS);
+    }
+  } else if (c != '\0') {
+    if (CURSOR_POS >= CURSOR_POS_MAX) {
+      fb_clear(0, CURSOR_POS_MAX);
+      CURSOR_POS = 0;
+    }
+    fb[2 * CURSOR_POS] = c;
+    fb[2 * CURSOR_POS + 1] = ((fg & 0x0F) << 4) | (bg & 0x0F);
+    CURSOR_POS++;
+  }
+}
+
+int32_t fb_write(int8_t *buf, uint32_t len) {
+  uint32_t index_to_buffer = 0;
+  while (index_to_buffer < len) {
+    fb_write_cell(buf[index_to_buffer], BACKGROUND_COLOR, FOREGROUND_COLOR);
+    fb_move_cursor();
+    index_to_buffer++;
+  }
+  return 0;
+}
+
+void fb_set_color(uint16_t background, uint16_t foreground) {
+  BACKGROUND_COLOR = background;
+  FOREGROUND_COLOR = foreground;
+}