From bad7f79ed146194a8db26c36111c9bc93679f364 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Tue, 21 Sep 2004 22:00:00 -0400
Subject: [PATCH] Import backup from 2004-09-21

---
 Makefile               |  24 ++++----
 kernel/Makefile        |  15 +++--
 kernel/block/ramdisk.c | 100 ++++++++++++++++++++++++++++++
 kernel/block/ramdisk.h |  25 ++++++++
 kernel/block/rd.c      |  53 ----------------
 kernel/block/rd.h      |  21 -------
 kernel/boot.asm        |  31 +++++++---
 kernel/char/keyboard.c |  13 ++--
 kernel/char/vconsole.c |  32 ++++++----
 kernel/char/vconsole.h |   2 +-
 kernel/console.c       |  82 -------------------------
 kernel/console.h       |  19 ------
 kernel/display.c       |  96 +++++++++++++++++++++++++++++
 kernel/display.h       |  29 +++++++++
 kernel/fs/devfs.c      |  16 +++++
 kernel/fs/devfs.h      |  15 +++++
 kernel/fs/devices.c    |   1 +
 kernel/fs/devices.h    |  11 +++-
 kernel/fs/ext2.c       |  16 +++++
 kernel/fs/ext2.h       |  82 +++++++++++++++++++++++++
 kernel/fs/vfs.c        |  10 +++
 kernel/fs/vfs.h        |  23 +++++++
 kernel/functions.h     |  15 ++++-
 kernel/kernel.c        |  67 ++++++++++-----------
 kernel/kernel.h        |   9 ++-
 kernel/kout.c          |   4 +-
 kernel/mm/vmm.c        |   5 --
 kernel/mm/vmm.h        |   8 ++-
 kernel/module.h        |   2 +-
 menu.lst               |   2 +-
 rmmod/Makefile         |   7 ++-
 rmmod/rmmod.asm        | 134 +++++++++++++++++++++++++++++++++++++++++
 32 files changed, 696 insertions(+), 273 deletions(-)
 create mode 100644 kernel/block/ramdisk.c
 create mode 100644 kernel/block/ramdisk.h
 delete mode 100644 kernel/block/rd.c
 delete mode 100644 kernel/block/rd.h
 delete mode 100644 kernel/console.c
 delete mode 100644 kernel/console.h
 create mode 100644 kernel/display.c
 create mode 100644 kernel/display.h
 create mode 100644 kernel/fs/devfs.c
 create mode 100644 kernel/fs/devfs.h
 create mode 100644 kernel/fs/ext2.c
 create mode 100644 kernel/fs/ext2.h
 create mode 100644 kernel/fs/vfs.c
 create mode 100644 kernel/fs/vfs.h

diff --git a/Makefile b/Makefile
index 39edd8a..7289a5a 100644
--- a/Makefile
+++ b/Makefile
@@ -12,39 +12,41 @@ MAKEFLAGS += --no-print-directory
 
 all:
 	make -C kernel
-#	make -C rmmod
+	make -C rmmod
 
 clean:
-	- make -C kernel clean
-	- make -C rmmod clean
-	- rm *~ *.out hos.flp \#*
+	-make -C kernel clean
+	-make -C rmmod clean
+	-rm -f *~ *.out hos.flp \#*
 
 
 grub:
-	- mkdir $(FLOPPY_MOUNT)
+	-mkdir $(FLOPPY_MOUNT)
 	mke2fs $(FLOPPY)
 	mount -t ext2 $(FLOPPY) $(FLOPPY_MOUNT)
 	grub-install --root-directory=$(FLOPPY_MOUNT) fd0
 	umount $(FLOPPY_MOUNT)
-	- rmdir $(FLOPPY_MOUNT)
+	-rmdir $(FLOPPY_MOUNT)
 
 grub_image:
 	dd if=$(FLOPPY) of=$(GRUB_IMAGE)
 
 install:
-	- mkdir $(FLOPPY_MOUNT)
+	-mkdir $(FLOPPY_MOUNT)
 	mount -t ext2 $(FLOPPY) $(FLOPPY_MOUNT)
-	cp kernel/kernel.bin  $(FLOPPY_MOUNT)
+	cp kernel/kernel.bin $(FLOPPY_MOUNT)
+	cp rmmod/rmmod.bin $(FLOPPY_MOUNT)
 	cp menu.lst $(FLOPPY_MOUNT)/boot/grub
 	umount $(FLOPPY_MOUNT)
-	- rmdir $(FLOPPY_MOUNT)
+	-rmdir $(FLOPPY_MOUNT)
 
 install_img:
-	- mkdir $(FLOPPY_MOUNT)
+	-mkdir $(FLOPPY_MOUNT)
 	cp grub.flp $(FLOPPY_IMAGE)
 	mount -t ext2 -o loop $(FLOPPY_IMAGE) $(FLOPPY_MOUNT)
 	cp kernel/kernel.bin $(FLOPPY_MOUNT)
+	cp rmmod/rmmod.bin $(FLOPPY_MOUNT)
 	cp menu.lst $(FLOPPY_MOUNT)/boot/grub
 	umount $(FLOPPY_MOUNT)
-	- rmdir $(FLOPPY_MOUNT)
+	-rmdir $(FLOPPY_MOUNT)
 
diff --git a/kernel/Makefile b/kernel/Makefile
index f704008..6bb31d6 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -1,7 +1,7 @@
 # Makefile for HOS
 # Josh Holtrop
 # Created: 07/08/04
-# Modified: 07/11/04
+# Modified: 08/22/04
 
 # Assembler Information:
 NASM=nasm
@@ -16,8 +16,10 @@ LD=ld
 LD_FLAGS=-nodefaultlibs -nostdlib --no-demangle -T link.ld
 
 all: Asm_Kernel C_Kernel
-	$(LD) $(LD_FLAGS) -Map kernel.map boot.o kernel.o asmfuncs.o mm.o vmm.o parallel.o \
-	conv.o kout.o vconsole.o console.o devices.o pic.o keyboard.o -o kernel.bin
+	$(LD) $(LD_FLAGS) -Map kernel.map \
+	boot.o kernel.o asmfuncs.o mm.o vmm.o parallel.o conv.o kout.o \
+	vconsole.o display.o devices.o pic.o keyboard.o ramdisk.o vfs.o \
+	devfs.o -o kernel.bin
 
 Asm_Kernel:
 	$(NASM) $(NASM_FLAGS) -l boot.lst boot.asm -o boot.o
@@ -32,14 +34,17 @@ C_Kernel:
 	$(CC) $(CC_FLAGS) -c kout.c -o kout.o
 	$(CC) $(CC_FLAGS) -c char/vconsole.c -o vconsole.o
 	$(CC) $(CC_FLAGS) -c fs/devices.c -o devices.o
-	$(CC) $(CC_FLAGS) -c console.c -o console.o
+	$(CC) $(CC_FLAGS) -c display.c -o display.o
 	$(CC) $(CC_FLAGS) -c sys/pic.c -o pic.o
 	$(CC) $(CC_FLAGS) -c char/keyboard.c -o keyboard.o
+	$(CC) $(CC_FLAGS) -c block/ramdisk.c -o ramdisk.o
+	$(CC) $(CC_FLAGS) -c fs/devfs.c -o devfs.o
+	$(CC) $(CC_FLAGS) -c fs/vfs.c -o vfs.o
 
 #################################################
 # Clean up the source directory of any binaries #
 #################################################
 clean:
-	- rm *.o *.bin *.map *.lst *.out *~ fs/*~ sys/*~ block/*~ char/*~ lang/*~ mm/*~
+	-rm -f *.o *.bin *.map *.lst *.out *~ fs/*~ sys/*~ block/*~ char/*~ lang/*~ mm/*~
 
 
diff --git a/kernel/block/ramdisk.c b/kernel/block/ramdisk.c
new file mode 100644
index 0000000..41db716
--- /dev/null
+++ b/kernel/block/ramdisk.c
@@ -0,0 +1,100 @@
+// ramdisk.c
+// Author: Josh Holtrop
+// Date: 08/20/04
+// Modified: 08/22/04
+
+#include "block/ramdisk.h"
+#include "fs/devices.h"
+#include "functions.h"
+#include "mm/vmm.h"
+#include "lang/asmfuncs.h"
+
+ramdisk_t *ramdisks[256];
+
+int	ramdisk_init(major_t major)
+{
+  dev_driver_t *ramdisk_driver;
+  if (( ramdisk_driver = New(dev_driver_t) ))
+    {
+      ramdisk_driver->block_read = ramdisk_block_read;
+      ramdisk_driver->block_write = ramdisk_block_write;
+      devices_register_major('b', major, ramdisk_driver);
+      return 0;
+    }
+  return -1;
+}
+
+minor_t ramdisk_new(u32_t size)
+{
+  int i;
+  for (i = 0; i < 256; i++)
+    {
+      if (!ramdisks[i])
+	{
+	  void *start;
+	  if (( start = kmalloc(size) ))
+	    {
+	      ramdisks[i] = New(ramdisk_t);
+	      ramdisks[i]->start = start;
+	      ramdisks[i]->size = size;
+	      return i;
+	    }
+	  return -2;
+	}
+    }
+  return -1;
+}
+
+minor_t	ramdisk_register(void *ramdisk, u32_t size)
+{
+	int i;
+	for (i = 0; i < 256; i++)
+	{
+		if (!ramdisks[i])
+		{
+		  ramdisks[i] = New(ramdisk_t);
+			ramdisks[i]->start = ramdisk;
+			ramdisks[i]->size = size;
+			return i;
+		}
+	}
+	return -1;
+}
+
+int	ramdisk_remove(minor_t minor)
+{
+	if (ramdisks[minor])
+	  {
+	    kfree(ramdisks[minor]->start);
+	    kfree(ramdisks[minor]);
+	    ramdisks[minor] = NULL;
+	    return 0;
+	  }
+	return -1;
+}
+
+int	ramdisk_block_read(minor_t minor, u32_t blockNum, u32_t count, void *buffer)
+{
+	if (!ramdisks[minor])
+		return -1;
+	if ((blockNum << BLOCK_SIZE_LOG) >= ramdisks[minor]->size)
+		return -2;
+	void *rdAddr = ramdisks[minor]->start + (blockNum << BLOCK_SIZE_LOG);
+	u32_t copyLen = min(count << BLOCK_SIZE_LOG, ramdisks[minor]->size - (u32_t)rdAddr);
+	memcpyd(buffer, rdAddr, copyLen >> 2);
+	return copyLen;
+}
+
+int	ramdisk_block_write(minor_t minor, u32_t blockNum, u32_t count, void *buffer)
+{
+	if (!ramdisks[minor])
+		return -1;
+	if ((blockNum << BLOCK_SIZE_LOG) >= ramdisks[minor]->size)
+		return -2;
+	void *rdAddr = ramdisks[minor]->start + (blockNum << BLOCK_SIZE_LOG);
+	u32_t copyLen = min(count << BLOCK_SIZE_LOG, ramdisks[minor]->size - (u32_t)rdAddr);
+	memcpyd(rdAddr, buffer, copyLen >> 2);
+	return copyLen;
+}
+
+
diff --git a/kernel/block/ramdisk.h b/kernel/block/ramdisk.h
new file mode 100644
index 0000000..0273901
--- /dev/null
+++ b/kernel/block/ramdisk.h
@@ -0,0 +1,25 @@
+// ramdisk.h
+// Author: Josh Holtrop
+// Date: 08/20/04
+// Modified: 08/22/04
+
+#ifndef __HOS_RD_H__
+#define __HOS_RD_H__ __HOS_RD_H__
+
+#include "hos_defines.h"
+#include "fs/devices.h"
+
+typedef struct {
+	void	*start;
+	u32_t	size;
+} ramdisk_t;
+
+int	ramdisk_init(major_t major);
+minor_t ramdisk_new(u32_t size);
+minor_t	ramdisk_register(void *ramdisk, u32_t size);
+int	ramdisk_remove(minor_t minor);
+int	ramdisk_block_read(minor_t minor, u32_t blockNum, u32_t count, void *buffer);
+int	ramdisk_block_write(minor_t minor, u32_t blockNum, u32_t count, void *buffer);
+
+#endif
+
diff --git a/kernel/block/rd.c b/kernel/block/rd.c
deleted file mode 100644
index 21f37d6..0000000
--- a/kernel/block/rd.c
+++ /dev/null
@@ -1,53 +0,0 @@
-
-#include "block/rd.h"
-#include "kernel.h"
-
-ramdisk_t ramdisks[256];
-char rd_refs[256];	//number of references to each ramdisk
-
-void	rd_init()
-{
-
-}
-
-int	rd_register(byte *ramdisk, u32_t size)
-{
-	int i;
-	for (i = 0; i < 256; i++)
-	{
-		if (!rd_refs[i])
-		{
-			rd_refs[i]++;
-			ramdisks[i].start = ramdisk;
-			ramdisks[i].size = size;
-			return i;
-		}
-	}
-	return -1;
-}
-
-int	rd_remove(minor_t minor)
-{
-	if (rd_refs[minor] <= 0)
-		return -1;
-	rd_refs[minor]--;
-	if (!rd_refs[minor])
-		free(ramdisks[minor].start);
-}
-
-int	rd_read_block(minor_t minor, u32_t blockNum, u32_t count, byte *buffer)
-{
-	if (rd_refs[minor] <= 0)
-		return -1;
-	byte *copyFrom = ramdisks[minor] + (blockNum << 9);
-	if (copyFrom > ramdisks[minor].start + ramdisks[minor].size)
-		return -1;
-
-}
-
-int	rd_write_block(minor_t minor, u32_t blockNum, u32_t count, byte *buffer)
-{
-
-}
-
-
diff --git a/kernel/block/rd.h b/kernel/block/rd.h
deleted file mode 100644
index ddd3386..0000000
--- a/kernel/block/rd.h
+++ /dev/null
@@ -1,21 +0,0 @@
-
-
-#ifndef __HOS_RD_H__
-#define __HOS_RD_H__ __HOS_RD_H__
-
-#include "kernel.h"
-#include "devices.h"
-
-typedef struct {
-	byte	*start;
-	u32_t	size;
-} ramdisk_t;
-
-void	rd_init();
-int	rd_register(byte *ramdisk, u32_t size);
-int	rd_remove(minor_t minor);
-int	rd_read_block(minor_t minor, u32_t blockNum, u32_t count, byte *buffer);
-int	rd_write_block(minor_t minor, u32_t blockNum, u32_t count, byte *buffer);
-
-#endif
-
diff --git a/kernel/boot.asm b/kernel/boot.asm
index 8281ed4..750f35f 100644
--- a/kernel/boot.asm
+++ b/kernel/boot.asm
@@ -25,7 +25,7 @@
 %define KERNEL_P PHYS_START+0x8000	;1mb+32kb - the kernel's physical address
 %define KERNEL_V KERNEL_P+VIRT_OFFSET	;3gb+1mb+32kb, the virtual address of the kernel
 
-extern _k_init, _isr, _k_mbsave, _end
+extern _k_init, _isr, _k_mbsave, _end, _rm_params, _initrd
 
 [bits 32]
 
@@ -64,10 +64,6 @@ segmented_start:
 	mov	fs, cx
 	mov	esp, STACK_V+0x1000		;ok, now we can access our data
 
-;aloop:
-;	inc dword [0xC00B8000]
-;	jmp	aloop
-
 
 ;Then the multiboot info structures are saved to local data variables.
 	add	ebx, VIRT_OFFSET
@@ -76,13 +72,30 @@ segmented_start:
 	call	_k_mbsave			;save multiboot info structures
 	add	esp, 8
 
-	cmp	eax, 0
+	cmp	eax, 0		; eax = pointer to mb_module_t struct for rmmod
 	jz	pm_return
 
 ;go back to real mode to initialize video mode
-	mov	ebx, pm_return
-
-
+	mov	ebx, eax	; pointer to mb_module_t
+	mov	ecx, [ebx+4]	; end of module
+	mov	eax, [ebx]	; start of module
+	mov	esi, eax	; start of module
+	sub	ecx, eax	; ecx = length of rmmod
+	shr	ecx, 2		; ecx = length of rmmod in dwords
+	mov	edi, 0xC0005000	; where to copy rmmod to (0x5000 physical)
+	
+	rep	movsd		; copy rmmod to first 1mb
+	
+	mov	ebx, pm_return	; return address
+	mov	ecx, _rm_params	; put real mode params here (video mode etc...)
+	sub	ecx, VIRT_OFFSET
+	mov	edx, _initrd	; load the 'floppy' image here
+	sub	edx, VIRT_OFFSET
+	
+	mov	eax, cr0
+	and	eax, 0x7FFFFFFE	; leave PM
+	mov	cr0, eax
+	jmp	0x0:0x5010	; jump to rmmod
 
 ;Next we enable paging with the first 4mb mapped 1:1 virtual:physical
 ; and with the 4mb starting at 0xC000_0000 mapped to the first 4mb physical.
diff --git a/kernel/char/keyboard.c b/kernel/char/keyboard.c
index 06bcde2..fc90681 100644
--- a/kernel/char/keyboard.c
+++ b/kernel/char/keyboard.c
@@ -5,12 +5,12 @@
 
 #include "hos_defines.h"
 #include "char/keyboard.h"
-#include "sys/io.h"
+#include "sys/io.h"			// inportb, outportb
 #include "functions.h"
 #include "lang/conv.h"			// asciiSwitchCase()
 
 #include "kout.h"
-#include "console.h"
+#include "display.h"			// display_activate()
 
 #define KBD_BUFFER_LENGTH 64
 
@@ -148,8 +148,13 @@ void isr_keyboard()
 
 	if (kbdAscii)
 		kprintf("%c", kbdAscii);
-	if (kbdScan >= 0x3B && kbdScan <= 0x40)
-		console_activate(kbdScan - 0x3A);
+//	if (kbdFlags & KBDF_ALT)
+//	  {
+	    if (kbdScan >= 0x3B && kbdScan <= 0x44)
+	      display_activate(kbdScan - 0x3B);
+	    if (kbdScan >= 0x57 && kbdScan <= 0x58)
+	      display_activate(kbdScan - 0x4D);
+//	  }
 }
 
 //Gets a key from the buffer, returns 0 if no keys available, returns immediately
diff --git a/kernel/char/vconsole.c b/kernel/char/vconsole.c
index c5edb37..edbfafb 100644
--- a/kernel/char/vconsole.c
+++ b/kernel/char/vconsole.c
@@ -8,12 +8,11 @@
 #include "fs/devices.h"
 #include "mm/vmm.h"
 #include "lang/asmfuncs.h"
-#include "console.h"
+#include "display.h"
 #include "functions.h"
 
 vconsole_t *vconsoles[VCONSOLE_MAX];	// pointer to virtual console structs
-extern int	activeConsole;	// console subsystem active virtual console number
-
+extern int display_activeConsole;	// display subsystem active virtual console number 
 char	ansi2vgaAttr[8] = {0, 4, 2, 6, 1, 5, 3, 7};
 
 void	vconsole_put_char(minor_t id, int c);
@@ -62,16 +61,16 @@ minor_t	vconsole_new(int width, int height)
 }
 
 
-// called by console subsystem to draw a virtual console to the screen
+// called by display subsystem to draw a virtual console to the screen
 int	vconsole_draw(minor_t id)
 {
 	if (vconsoles[id])
-		return console_draw(id, vconsoles[id]->cursorPosition, vconsoles[id]->buffer);
+		return display_console_draw(id, vconsoles[id]->cursorPosition, vconsoles[id]->buffer);
 	return -1;
 }
 
 
-// called by character device driver when a character is written to device w/ minor #id
+// called by character device interface when a character is written to device w/ minor #id
 int	vconsole_char_write(minor_t id, int c)
 {
 	if (!vconsoles[id])
@@ -108,13 +107,13 @@ int	vconsole_char_write(minor_t id, int c)
 					cursorY = vconsoles[id]->height - 1;
 				vconsole_update_cursor(id, cursorY * vconsoles[id]->width + cursorX);
 				break;
-			case 'C':	// move cursor right n columns
+			case 'C':	// move cursor left n columns
 				cursorX -= vconsoles[id]->escapeValue[0];
 				if (cursorX < 0)
 					cursorX = 0;
 				vconsole_update_cursor(id, cursorY * vconsoles[id]->width + cursorX);
 				break;
-			case 'D':	// move cursor left n columns
+			case 'D':	// move cursor right n columns
 				cursorX += vconsoles[id]->escapeValue[0];
 				if (cursorX >= vconsoles[id]->width)
 					cursorX = vconsoles[id]->width - 1;
@@ -250,8 +249,8 @@ void	vconsole_put_char(minor_t id, int c)
 			break;
 		default:
 			vconsoles[id]->buffer[vconsoles[id]->cursorPosition] = c | (vconsoles[id]->attribute << 8);
-			if (id == activeConsole)
-				console_put_char(id, c | (vconsoles[id]->attribute << 8), vconsoles[id]->cursorPosition);
+			if (id == display_activeConsole)
+				display_console_put_char(id, c | (vconsoles[id]->attribute << 8), vconsoles[id]->cursorPosition);
 			vconsole_update_cursor(id, vconsoles[id]->cursorPosition + 1);
 		}
 	}
@@ -262,17 +261,24 @@ void	vconsole_update_cursor(minor_t id, u16_t position)
 	vconsoles[id]->cursorPosition = position;
 	if (position >= (vconsoles[id]->width * vconsoles[id]->height))	// time to scroll console
 	{
+	  int i;
+	  for (i = 0; i < vconsoles[id]->cursorStackPosition; i++)
+	    {
+	      vconsoles[id]->cursorStack[i] -= vconsoles[id]->width;
+	      if (vconsoles[id]->cursorStack[i] < 0)
+		vconsoles[id]->cursorStack[i] = 0;
+	    }
 		vconsoles[id]->cursorPosition -= vconsoles[id]->width;
 		memcpyw(vconsoles[id]->buffer, vconsoles[id]->buffer + vconsoles[id]->width, vconsoles[id]->width * (vconsoles[id]->height - 1));
 		memsetw(vconsoles[id]->buffer + (vconsoles[id]->width * (vconsoles[id]->height - 1)), 0x0720, vconsoles[id]->width);
-		if (activeConsole == id)
+		if (display_activeConsole == id)
 		{
 			vconsole_draw(id);
 			return;
 		}
 	}
-	if (activeConsole == id)
-		console_update_cursor(id, position);
+	if (display_activeConsole == id)
+		display_console_update_cursor(id, position);
 }
 
 void	vconsole_update_attribute(minor_t id)
diff --git a/kernel/char/vconsole.h b/kernel/char/vconsole.h
index 5fce425..31a454a 100644
--- a/kernel/char/vconsole.h
+++ b/kernel/char/vconsole.h
@@ -18,7 +18,7 @@ typedef struct
 	u16_t	cursorPosition;
 	u16_t	width;
 	u16_t	height;
-	u16_t	cursorStack[16];
+	short	cursorStack[16];
 
 	u8_t	attribute;
 	u8_t	foreground;
diff --git a/kernel/console.c b/kernel/console.c
deleted file mode 100644
index b481fec..0000000
--- a/kernel/console.c
+++ /dev/null
@@ -1,82 +0,0 @@
-// console.c
-// Author: Josh Holtrop
-// Date: 08/07/04
-// Modified: 08/16/04
-
-#include "fs/devices.h"
-#include "char/vconsole.h"
-#include "console.h"
-#include "lang/asmfuncs.h"
-
-int activeConsole;
-int numConsoles;
-
-// initialization routine for console subsystem
-int console_init(int num)
-{
-	int i;
-	activeConsole = 0;
-	for (i = 0; i < num; i++)
-	{
-		minor_t vc = vconsole_new(80, 25);
-		if (vc)
-		{
-			numConsoles++;
-			if (!activeConsole)
-				activeConsole = vc;
-		}
-	}
-	if (numConsoles)
-		return 0;
-	return -1;
-}
-
-
-// activate a virtual console
-int console_activate(minor_t id)
-{
-	if (id > 0 && id <= numConsoles)
-	{
-		activeConsole = id;
-		return vconsole_draw(id);
-	}
-	return -1;
-}
-
-// routine to refresh a console window
-int console_draw(minor_t id, int cursorPosition, u16_t *buffer)
-{
-	if (id == activeConsole)
-	{
-		memcpyw((void *)CONSOLE_MEMORY, buffer, 2000);
-		writeCursorPosition(cursorPosition);
-		return 0;
-	}
-	return -1;
-}
-
-
-// write a character to the screen
-int console_put_char(minor_t id, u16_t c, int position)
-{
-	if (id == activeConsole)
-	{
-		*(u16_t *)(CONSOLE_MEMORY + (position << 1)) = c;
-		return 0;
-	}
-	return -1;
-}
-
-
-// move the cursor on the screen
-int console_update_cursor(minor_t id, int cursorPosition)
-{
-	if (id == activeConsole)
-	{
-		writeCursorPosition(cursorPosition);
-		return 0;
-	}
-	return -1;
-}
-
-
diff --git a/kernel/console.h b/kernel/console.h
deleted file mode 100644
index 12a1c73..0000000
--- a/kernel/console.h
+++ /dev/null
@@ -1,19 +0,0 @@
-// console.h
-// Author: Josh Holtrop
-// Date: 08/07/04
-
-#ifndef __HOS_CONSOLE__
-#define __HOS_CONSOLE__ __HOS_CONSOLE__
-
-#include "hos_defines.h"
-#include "fs/devices.h"
-
-int console_init(int num);
-int console_activate(minor_t id);
-int console_draw(minor_t id, int cursorPosition, u16_t *buffer);
-int console_put_char(minor_t id, u16_t c, int position);
-int console_update_cursor(minor_t id, int cursorPosition);
-
-#endif
-
-
diff --git a/kernel/display.c b/kernel/display.c
new file mode 100644
index 0000000..f36d6df
--- /dev/null
+++ b/kernel/display.c
@@ -0,0 +1,96 @@
+// display.c
+// Author: Josh Holtrop
+// Date: 08/07/04
+// Modified: 08/21/04
+
+#include "fs/devices.h"
+#include "char/vconsole.h"
+#include "display.h"
+#include "lang/asmfuncs.h"
+
+int display_activeConsole = -1;		// start with no active console
+display_t myDisplays[12];		// f1-f12 change displays
+
+// initialization routine for display subsystem
+int display_init()
+{
+  minor_t vc;
+  if ((vc = vconsole_new(80, 25)))
+    {
+      myDisplays[11].type = DISPLAY_CONSOLE;
+      myDisplays[11].id = vc;
+      display_activeConsole = vc;
+    }
+  int i;
+  for (i = 0; i < 6; i++)
+    {
+      if ((vc = vconsole_new(80, 25)))
+	{
+	  myDisplays[i].type = DISPLAY_CONSOLE;
+	  myDisplays[i].id = vc;
+	}
+    }
+  return 0;
+}
+
+
+// activate the given display
+int display_activate(u32_t id)
+{
+  if (id > 11)
+    return -1;
+  switch (myDisplays[id].type)
+    {
+    case DISPLAY_CONSOLE:
+      display_activeConsole = myDisplays[id].id;
+      return vconsole_draw(display_activeConsole);
+    case DISPLAY_GRAPHICAL:
+    default:
+      return -2;
+    }
+}
+
+// routine to refresh a console window
+int display_console_draw(minor_t id, int cursorPosition, u16_t *buffer)
+{
+  if (id == display_activeConsole)
+    {
+      int i;
+      for (i = 0; i < 12; i++)
+	{
+	  if (myDisplays[i].id == id)
+	    {
+	      memcpyw((void *)CONSOLE_MEMORY, buffer, 2000);
+	      writeCursorPosition(cursorPosition);
+	      return 0;
+	    }
+	}
+    }
+  return -1;
+}
+
+
+// write a character to the screen
+int display_console_put_char(minor_t id, u16_t c, int position)
+{
+  if (id == display_activeConsole)
+    {
+      *(u16_t *)(CONSOLE_MEMORY + (position << 1)) = c;
+      return 0;
+    }
+  return -1;
+}
+
+
+// move the cursor on the screen
+int display_console_update_cursor(minor_t id, int cursorPosition)
+{
+  if (id == display_activeConsole)
+    {
+      writeCursorPosition(cursorPosition);
+      return 0;
+    }
+  return -1;
+}
+
+
diff --git a/kernel/display.h b/kernel/display.h
new file mode 100644
index 0000000..c77269e
--- /dev/null
+++ b/kernel/display.h
@@ -0,0 +1,29 @@
+// display.h
+// Author: Josh Holtrop
+// Date: 08/07/04
+// Modified: 08/21/04
+
+#ifndef __HOS_CONSOLE__
+#define __HOS_CONSOLE__ __HOS_CONSOLE__
+
+#include "hos_defines.h"
+#include "fs/devices.h"
+
+#define DISPLAY_NULL 0
+#define DISPLAY_CONSOLE 1
+#define DISPLAY_GRAPHICAL 2
+
+typedef struct {
+  int type;
+  minor_t id;
+} display_t;
+
+int display_init();
+int display_activate(u32_t id);
+int display_console_draw(minor_t id, int cursorPosition, u16_t *buffer);
+int display_console_put_char(minor_t id, u16_t c, int position);
+int display_console_update_cursor(minor_t id, int cursorPosition);
+
+#endif
+
+
diff --git a/kernel/fs/devfs.c b/kernel/fs/devfs.c
new file mode 100644
index 0000000..9a27e96
--- /dev/null
+++ b/kernel/fs/devfs.c
@@ -0,0 +1,16 @@
+// devfs.c
+// Author: Josh Holtrop
+// Date: 08/22/04
+// Modified: 08/22/04
+
+#include "hos_defines.h"
+#include "fs/devfs.h"
+#include "fs/devices.h"
+#include "fs/vfs.h"
+
+void devfs_init(minor_t rd_minor)
+{
+//  vfs_mount(MAJORB_RAMDISK, rd_minor, FS_EXT2, "/dev");
+}
+
+
diff --git a/kernel/fs/devfs.h b/kernel/fs/devfs.h
new file mode 100644
index 0000000..f006b34
--- /dev/null
+++ b/kernel/fs/devfs.h
@@ -0,0 +1,15 @@
+// devfs.h
+// Author: Josh Holtrop
+// Date: 08/22/04
+// Modified: 08/22/04
+
+#ifndef __HOS_DEVFS_H__
+#define __HOS_DEVFS_H__ __HOS_DEVFS_H__
+
+#include "hos_defines.h"
+#include "fs/devices.h"
+
+void devfs_init(minor_t rd_minor);
+
+#endif
+
diff --git a/kernel/fs/devices.c b/kernel/fs/devices.c
index 89af08b..a73f115 100644
--- a/kernel/fs/devices.c
+++ b/kernel/fs/devices.c
@@ -17,6 +17,7 @@ void	devices_init()
 {
 	parallel_init(MAJORC_PARALLEL);
 	vconsole_init(MAJORC_VCONSOLE);
+	//	ramdisk_init(MAJORB_RAMDISK);
 }
 
 
diff --git a/kernel/fs/devices.h b/kernel/fs/devices.h
index 3af3866..17b83d0 100644
--- a/kernel/fs/devices.h
+++ b/kernel/fs/devices.h
@@ -1,7 +1,7 @@
 // devices.h
 // Author: Josh Holtrop
 // Date: 08/02/04
-// Modified: 08/16/04
+// Modified: 08/22/04
 
 #ifndef __HOS_DEVICES_H__
 #define __HOS_DEVICES_H__ __HOS_DEVICES_H__
@@ -12,8 +12,13 @@
 #define MAJORC_PARALLEL 6
 #define MAJORC_KEYBOARD 11
 
-typedef unsigned char major_t;
-typedef unsigned char minor_t;
+#define MAJORB_RAMDISK 1
+
+#define BLOCK_SIZE 512
+#define BLOCK_SIZE_LOG 9
+
+typedef short major_t;
+typedef short minor_t;
 
 typedef struct {
 	int	(*block_read)(minor_t minor, u32_t blockStart, u32_t blocks, void *buffer);
diff --git a/kernel/fs/ext2.c b/kernel/fs/ext2.c
new file mode 100644
index 0000000..917c586
--- /dev/null
+++ b/kernel/fs/ext2.c
@@ -0,0 +1,16 @@
+// ext2.c
+// Author: Josh Holtrop
+// Date: 08/22/04
+// Modified: 08/22/04
+
+#include "hos_defines.h"
+#include "fs/devices.h"
+#include "kout.h"
+
+void ext2_read_super(major_t major, minor_t minor);
+{
+  ext2_super_block_t *super = kmalloc(1024);
+  block_read(major, minor, 2, 2, super);
+  kprintf("Magic: 0x%x\n", super->s_magic);
+}
+
diff --git a/kernel/fs/ext2.h b/kernel/fs/ext2.h
new file mode 100644
index 0000000..fc5ed84
--- /dev/null
+++ b/kernel/fs/ext2.h
@@ -0,0 +1,82 @@
+// ext2.h
+// Author: Josh Holtrop
+// Date: 08/22/04
+// Modified: 08/22/04
+
+#ifndef __HOS_EXT2_H__
+#define __HOS_EXT2_H__ __HOS_EXT2_H__
+
+#include "hos_defines.h"
+#include "fs/devices.h"
+
+typedef struct {
+  u32_t   s_inodes_count;         /* Inodes count */
+  u32_t   s_blocks_count;         /* Blocks count */
+  u32_t   s_r_blocks_count;       /* Reserved blocks count */
+  u32_t   s_free_blocks_count;    /* Free blocks count */
+  u32_t   s_free_inodes_count;    /* Free inodes count */
+  u32_t   s_first_data_block;     /* First Data Block */
+  u32_t   s_log_block_size;       /* Block size */
+  int     s_log_frag_size;        /* Fragment size */
+  u32_t   s_blocks_per_group;     /* # Blocks per group */
+  u32_t   s_frags_per_group;      /* # Fragments per group */
+  u32_t   s_inodes_per_group;     /* # Inodes per group */
+  u32_t   s_mtime;                /* Mount time */
+  u32_t   s_wtime;                /* Write time */
+  u16_t   s_mnt_count;            /* Mount count */
+  short   s_max_mnt_count;        /* Maximal mount count */
+  u16_t   s_magic;                /* Magic signature */
+  u16_t   s_state;                /* File system state */
+  u16_t   s_errors;               /* Behaviour when detecting errors */
+  u16_t   s_minor_rev_level;      /* minor revision level */
+  u32_t   s_lastcheck;            /* time of last check */
+  u32_t   s_checkinterval;        /* max. time between checks */
+  u32_t   s_creator_os;           /* OS */
+  u32_t   s_rev_level;            /* Revision level */
+  u16_t   s_def_resuid;           /* Default uid for reserved blocks */
+  u16_t   s_def_resgid;           /* Default gid for reserved blocks */
+
+  /*
+   * EXT2_DYNAMIC_REV fields...
+   */
+  u32_t   s_first_ino;            /* First non-reserved inode */
+  u16_t   s_inode_size;           /* size of inode structure */
+  u16_t   s_block_group_nr;       /* block group # of this superblock */
+  u32_t   s_feature_compat;       /* compatible feature set */
+  u32_t   s_feature_incompat;     /* incompatible feature set */
+  u32_t   s_feature_ro_compat;    /* readonly-compatible feature set */
+  u8_t    s_uuid[16];             /* 128-bit uuid for volume */
+  char    s_volume_name[16];      /* volume name */
+  char    s_last_mounted[64];     /* directory where last mounted */
+  u32_t   s_algorithm_usage_bitmap; /* For compression */
+
+  /*
+   * Performance hints...
+   */
+  u8_t    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
+  u8_t    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
+  u16_t   s_padding1;
+
+  /*
+   * Journaling information...
+   */
+  u8_t    s_journal_uuid[16];     /* uuid of journal superblock */
+  u32_t   s_journal_inum;         /* inode number of journal file */
+  u32_t   s_journal_dev;          /* device number of journal file */
+  u32_t   s_last_orphan;          /* start of list of inodes to delete */
+  u32_t   s_hash_seed[4];         /* HTREE hash seed */
+  u8_t    s_def_hash_version;     /* Default hash version to use */
+  u8_t    s_reserved_char_pad;
+  u16_t   s_reserved_word_pad;
+  u32_t   s_default_mount_opts;
+  u32_t   s_first_meta_bg;        /* First metablock block group */
+  u32_t   s_reserved[190];        /* Padding to the end of the block */
+
+} ext2_super_block_t;
+
+
+void ext2_read_super(major_t major, minor_t minor);
+
+
+#endif
+
diff --git a/kernel/fs/vfs.c b/kernel/fs/vfs.c
new file mode 100644
index 0000000..d16b376
--- /dev/null
+++ b/kernel/fs/vfs.c
@@ -0,0 +1,10 @@
+// vfs.c
+// Author: Josh Holtrop
+// Date: 08/22/04
+// Modified: 08/22/04
+
+#include "hos_defines.h"
+#include "fs/vfs.h"
+
+vfs_mount_t *firstMount;
+
diff --git a/kernel/fs/vfs.h b/kernel/fs/vfs.h
new file mode 100644
index 0000000..8432023
--- /dev/null
+++ b/kernel/fs/vfs.h
@@ -0,0 +1,23 @@
+// vfs.h
+// Author: Josh Holtrop
+// Date: 08/22/04
+// Modified: 08/22/04
+
+#ifndef __HOS_VFS_H__
+#define __HOS_VFS_H__ __HOS_VFS_H__
+
+#include "hos_defines.h"
+#include "fs/devices.h"
+
+#define FS_EXT2 1
+
+typedef struct {
+  char *name;
+  void *super;
+  void *next;
+  major_t major;
+  minor_t minor;
+} vfs_mount_t;
+
+#endif
+
diff --git a/kernel/functions.h b/kernel/functions.h
index a850ff6..4166039 100644
--- a/kernel/functions.h
+++ b/kernel/functions.h
@@ -59,8 +59,7 @@ static inline void timer_init(u32_t freq)
 	outportb(0x40, wait >> 8); //msb
 }
 
-//Returns the size of the kernel (code & data)
-// - this does include the bss section
+//Returns the size of the kernel (code & data & bss)
 // - this should be 4kb aligned per the linker script
 // - this is the amount of RAM the kernel code, data, & bss take
 static inline u32_t kernel_size_used()
@@ -89,6 +88,18 @@ static inline byte byte2bcd(byte bite)
 	return ((bite / 10) << 4) | (bite % 10);
 }
 
+// get the maximum of two values
+static inline u32_t max(u32_t v1, u32_t v2)
+{
+  return ( (v2 > v1) ? v2 : v1 );
+}
+
+// get the minimum of two values
+static inline u32_t min(u32_t v1, u32_t v2)
+{
+  return ( (v2 > v1) ? v1 : v2 );
+}
+
 #endif
 
 
diff --git a/kernel/kernel.c b/kernel/kernel.c
index 475ee83..cd6f694 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -1,6 +1,7 @@
 // kernel.h
 // Author: Josh Holtrop
 // Date: 08/16/04
+// Modified: 08/28/04
 // This is the main kernel initialization and boot-strapping file
 
 #include "kernel.h"
@@ -15,29 +16,37 @@
 #include "lang/conv.h"
 #include "char/vconsole.h"
 #include "fs/devices.h"
-#include "console.h"
+#include "display.h"
 #include "sys/io.h"
 #include "sys/pic.h"
 #include "char/keyboard.h"
+#include "fs/devfs.h"
+#include "block/ramdisk.h"
+#include "fs/vfs.h"
+#include "fs/ext2.h"
 
 mb_info_t mb_info_block;
 mb_mmap_t mb_mmap[MAX_MMAP];
 u32_t mmap_entries;
 mb_module_t mb_modules[MAX_MODULES];
 mb_apm_t mb_apm_table;
-byte real_mode_module;
+mb_module_t *real_mode_module;  // pointer to real mode module (if present)
+real_mode_param_t rm_params;
 char mb_cmdline[256];
 int criticalCounter;	// semaphore for if interrupts are disabled
-u32_t timer;
+u32_t timer;  // number of IRQ 0's
+minor_t devfs_minor = -1;
+minor_t initrd_minor = -1;
+byte initrd[2880*512];  // buffer in bss for loading a floppy image
 
 extern u32_t mm_freepages;
 
 /* This function runs in segmented memory - 0xC000_0000 is mapped to 0x0 but 0x0
    itself is an invalid linear address. Therefore, the multiboot information addresses
    must be manually adjusted by VIRT_OFFSET to become valid linear addresses. */
-int k_mbsave(mb_info_t *mbinfo, unsigned int mb_magic)
+mb_module_t *k_mbsave(mb_info_t *mbinfo, unsigned int mb_magic)
 {
-	real_mode_module = 0;
+	real_mode_module = NULL;
 	if (mb_magic != MULTIBOOT_BOOTLOADER_MAGIC)
 	{
 		char *msg = "Bad multiboot magic identifier!";
@@ -66,8 +75,8 @@ int k_mbsave(mb_info_t *mbinfo, unsigned int mb_magic)
 			mb_modules[i].mod_start += VIRT_OFFSET;
 			mb_modules[i].mod_end += VIRT_OFFSET;
 			hos_module_header_t *mod = (hos_module_header_t *)mb_modules[i].mod_start;
-			if (mod->mod_type == MOD_REAL_MODE)
-				real_mode_module = 1;
+			if (mod->mod_magic == 0x4D534F48 && mod->mod_type == MOD_REAL_MODE)
+				real_mode_module = &mb_modules[i];
 		}
 	}
 	if (mb_info_block.flags & MB_BOOTLOADER_MMAP)
@@ -101,39 +110,25 @@ void k_init()
 	timer_init(HOS_TIMER_FREQ);
 	mm_init();
 	vmm_init();
-		// test the memory manager
-/*	char *all;
-	int size = 1;
-	u32_t add = 1;
-	for (;;)
-	{
-		all = kmalloc(size);
-		add = (u32_t)all;
-		if (!add)
-			break;
-		u32_t pte = (add >> 12) & 0x3FF;
-		u32_t pde = add >> 22;
-		u32_t mapped = *((u32_t *)(0xFFC00000 | (pde << 12) | (pte << 2)));
-		kprintf("Got address 0x%x mapped to 0x%x size=%d\n", add, mapped, size);
-		memset(all, 0, size);
-		size <<= 1;
-	}*/
 	devices_init();
-	console_init(6);
-	console_activate(1);
-	kprintf(" \e[31mWe \e[1mcan \e[32mfinally \e[33;45msee\e[0;7m text\e[0m!\n");
-	u16_t *vidMem = (u16_t *)(CONSOLE_MEMORY + 160);
-	u16_t i;
-	for (i = 0; i < 256; i++)
-	{
-		*vidMem++ = (i << 8) | '*';
-		if (((u32_t)vidMem % 32) == 0)
-			vidMem += 64;
-	}
 	if (real_mode_module)
 	{
-		kprintf("Real mode module present\n");
+	  if (rm_params.vid_mem)  // there is video memory to map in
+	    vmm_mapn(0xF0000000, (u32_t)rm_params.vid_addr, (rm_params.vid_mem >> 12) + 1);
+	  if (rm_params.initrd_loaded)  // there is an initrd to register
+	    initrd_minor = ramdisk_register(initrd, 2880*512);
 	}
+	display_init(); //get us some virtual consoles to look at
+	display_activate(11);
+	kprintf("HOS v0.15 initializing...\n");
+	kprintf("Kernel load size: %d (0x%x) bytes (%d kb)\n", kernel_size(), kernel_size(), kernel_size() >> 10);
+	kprintf("Kernel memory size: %d (0x%x) bytes (%d kb)\n", kernel_size_used(), kernel_size_used(), kernel_size_used() >> 10);
+	if ((devfs_minor = ramdisk_new(4096)) < 0)
+	  {
+	    kprintf("\e31;1mk_init(): Could not obtain minor mumber for devfs ram disk!\n");
+	    halt();
+	  }
+	devfs_init(devfs_minor);
 	criticalCounter--;
 }
 
diff --git a/kernel/kernel.h b/kernel/kernel.h
index 7b2bdc8..de007d1 100644
--- a/kernel/kernel.h
+++ b/kernel/kernel.h
@@ -1,3 +1,7 @@
+// kernel.h
+// Author: Josh Holtrop
+// Date: 08/16/04
+// Modified: 08/28/04
 
 #ifndef __HOS_KERNEL_H__
 #define __HOS_KERNEL_H__ __HOS_KERNEL_H__
@@ -11,16 +15,15 @@ typedef struct {
 	u32_t	height;		// height in pixels or columns if vid_mem == 0
 	u32_t	vid_mem;	// amount of memory for video buffer
 	u32_t	bpp;		// bits per pixel - 16/24/32
+  byte initrd_loaded;  // did we load an initrd?
 } __attribute__ ((packed)) real_mode_param_t;
 
 /* returns true to callee if we should jump to a real mode module */
-int k_mbsave(mb_info_t *mbinfo, unsigned int mb_magic);
+mb_module_t *k_mbsave(mb_info_t *mbinfo, unsigned int mb_magic);
 void k_init();
 void isr();
 void k_enter_critical();	// functions for implementing "atomic actions"
 void k_leave_critical();
 
-void BOCHS_DEBUG(u32_t pos, u32_t param);
-
 #endif
 
diff --git a/kernel/kout.c b/kernel/kout.c
index a4f8055..ad65403 100644
--- a/kernel/kout.c
+++ b/kernel/kout.c
@@ -9,7 +9,7 @@
 #include "lang/conv.h"
 #include "fs/devices.h"
 
-extern int activeConsole;
+extern int display_activeConsole;
 
 char	buffer[64];
 
@@ -19,7 +19,7 @@ void	putc(int c)
 	#ifdef PARALLEL_DEBUG
 		char_write(MAJORC_PARALLEL, 0, c);
 	#endif
-	char_write(MAJORC_VCONSOLE, activeConsole, c);
+	char_write(MAJORC_VCONSOLE, display_activeConsole, c);
 }
 
 
diff --git a/kernel/mm/vmm.c b/kernel/mm/vmm.c
index ae6e508..44a761c 100644
--- a/kernel/mm/vmm.c
+++ b/kernel/mm/vmm.c
@@ -10,11 +10,6 @@
 #include "lang/asmfuncs.h"
 #include "mm/mm.h"
 
-int	vmm_map(void *virt);
-int	vmm_map1(unsigned int virt, unsigned int physical);
-int	vmm_mapn(unsigned int virt, unsigned int physical, unsigned int n);
-void	vmm_unmap1(unsigned int virt);
-void	vmm_unmapn(unsigned int virt, unsigned int n);
 int	vmm_map_range(void *virt_start, void *virt_end, u32_t phys_start);
 void *vmm_getFreeChunk(u32_t size);
 void	vmm_removeHeapEntry(u32_t queue, HeapEntry_t *he);
diff --git a/kernel/mm/vmm.h b/kernel/mm/vmm.h
index e8e4847..8f4f20d 100644
--- a/kernel/mm/vmm.h
+++ b/kernel/mm/vmm.h
@@ -2,7 +2,7 @@
 // Author: Josh Holtrop
 // Date: 09/30/03
 // Rewritten from scratch: 12/23/03, 07/13/04
-// Modified: 07/30/04
+// Modified: 08/28/04
 
 #ifndef __HOS_VMM__
 #define __HOS_VMM__ __HOS_VMM__
@@ -44,6 +44,12 @@ void	*vmm_palloc();
 int	vmm_pfree(void *addr);
 void	*kcalloc(unsigned int number, unsigned int size);
 
+int	vmm_map(void *virt);
+int	vmm_map1(unsigned int virt, unsigned int physical);
+int	vmm_mapn(unsigned int virt, unsigned int physical, unsigned int n);
+void	vmm_unmap1(unsigned int virt);
+void	vmm_unmapn(unsigned int virt, unsigned int n);
+
 #endif
 
 
diff --git a/kernel/module.h b/kernel/module.h
index 67f94c9..b906f25 100644
--- a/kernel/module.h
+++ b/kernel/module.h
@@ -3,7 +3,7 @@
 #define __HOS_MODULE_H__ __HOS_MODULE_H__
 
 #define MOD_REAL_MODE 1
-#define MOD_KERNEL 2
+#define MOD_INITRD 2
 
 typedef struct {
 	unsigned int mod_magic;		// "HOSM" = dword value 0x4D534F48
diff --git a/menu.lst b/menu.lst
index 1198881..42ccb2e 100644
--- a/menu.lst
+++ b/menu.lst
@@ -5,5 +5,5 @@ default 0
 title HOS 0.15
 root (fd0)
 kernel /kernel.bin
-
+module /rmmod.bin
 
diff --git a/rmmod/Makefile b/rmmod/Makefile
index 2c0f7a2..c5572d8 100644
--- a/rmmod/Makefile
+++ b/rmmod/Makefile
@@ -1,2 +1,7 @@
+NASM=nasm
+
+all:
+	$(NASM) -f bin rmmod.asm -l rmmod.lst -o rmmod.bin
+
 clean:
-	- rm *~ *.o *.bin *.lst
+	-rm -f *~ *.o *.bin *.lst
diff --git a/rmmod/rmmod.asm b/rmmod/rmmod.asm
index e69de29..1c0931f 100644
--- a/rmmod/rmmod.asm
+++ b/rmmod/rmmod.asm
@@ -0,0 +1,134 @@
+; rmmod.asm
+; real mode module for HOS
+; Author: Josh Holtrop
+; Date: 09/20/04
+
+; the bootstrap process will jump us to 0x0:0x5010 so we'd better be ready for it
+[org 0x5000]
+[bits 16]
+			;HOS module header, better be 16 bytes!
+	dd	0x4D534F48	; magic identifier "HOSM"
+	dd	1		; real mode module
+	dd	start		; start address
+	dd	0		; reserved
+
+; ebx = return address
+; ecx = where to store real mode parameter table
+; edx = initrd, where to put ram disk
+start:
+	mov	ax, cs		; 0
+	mov	ds, ax
+	mov	es, ax
+	mov	ss, ax
+	mov	esp, 0x7000
+	mov	[dat_rmadd], ecx
+	mov	[dat_initrd], edx
+	mov	[dat_retn], ebx
+
+	mov	ah, 0				;reset floppy controller
+	mov	dl, 0
+	int	0x13
+
+	push	txt_loading_initrd		;print loading initrd string
+	push	23*80
+	call	putString
+	add	sp, 4
+
+	push	es				; draw a red bar to fill in
+	mov	ax, 0xb800
+	mov	es, ax
+	mov	di, 24*160
+	mov	cx, 80
+	mov	ax, 0x04B0
+	rep	stosw
+	pop	es
+
+	mov	cx, 80				;80 cylinders to read
+	xor	si, si                          ;start at cylinder 0
+	mov	edi, [dat_initrd]		;ram disk address
+read_cylinder:
+	push	cx
+	
+	mov	bx, 0x1000			;read sectors from head 0
+	mov	es, bx
+	xor	bx, bx				;es:bx = data buffer for read
+	mov	ax, 0x0212			;ah = int 0x13 function 2, al = number of sectors to read
+	mov	cx, si				;what cyl. we are on is now in cx
+	mov	ch, cl				;ch = cyl. number
+	mov	cl, 1				;cl = sector number 1-63
+	xor	dx, dx				;dh = head number
+;	mov	dl, 0				;dl = drive number
+	int	0x13
+
+	mov	bx, 0x1000			;now read sectors from head 1
+	mov	es, bx
+	mov	bx, 9216			;es:bx = data buffer for read
+	mov	ax, 0x0212			;ah = int 0x13 function 2, al = number of sectors to read
+	mov	cx, si				;what cyl. we are on is now in cx
+	mov	ch, cl				;ch = cyl. number
+	mov	cl, 1				;cl = sector number 1-63
+;	mov	dh, 1				;dh = head number
+;	mov	dl, 0				;dl = drive number
+	mov	dx, 0x0100
+	int	0x13
+
+	mov	ebx, 0xb8000			;draw a green block
+	add	bx, si
+	shl	bl, 1
+	mov	word [ds:ebx+160*24], 0x0200+219
+
+	push	si
+	mov	esi, 0x10000			;now copy the disk up to where we will keep it
+	mov	cx, 0x2400
+	rep o32 movsb
+
+	pop	si				;what cylinder# we are on...
+	inc	si
+	pop	cx
+	loop	read_cylinder
+
+aloop:
+	jmp	aloop
+
+; putString(int position, char *str)
+putString:
+	push	bp
+	mov	bp, sp
+	push	ds
+	push	es
+	push	edi
+	push	esi
+	push	eax
+
+	mov	ax, 0xb800
+	mov	es, ax
+	xor	ax, ax
+	mov	ds, ax
+	mov	ax, [bp + 4]
+	mov	di, ax
+	shl	di, 1
+	mov	ax, [bp + 6]
+	mov	si, ax
+
+putString_loop:
+	lodsb
+	stosb
+	cmp	al, 0
+	jz	putString_loop_done
+	mov	al, 0x07
+	stosb
+	jmp	putString_loop
+putString_loop_done:
+
+	pop	eax
+	pop	esi
+	pop	edi
+	pop	es
+	pop	ds
+	pop	bp
+	ret
+
+txt_loading_initrd:	db	"Loading initrd...     ", 0
+dat_rmadd		dd	0
+dat_initrd		dd	0
+dat_retn		dd	0