Adds all assignments not previously in a git repo

3 files changed, 291 insertions, 0 deletions

diff --git a/CS3871/os/boot.s b/CS3871/os/boot.s
new file mode 100644
index 0000000..6dc9464
--- /dev/null
+++ b/CS3871/os/boot.s
@@ -0,0 +1,37 @@
+	bits 16
+	org 7c00h
+	mov si, loading
+	call print
+	
+	mov ax, 7d00h
+	mov es, ax
+	mov bx, $0
+	
+	mov dl, 0
+	mov dh, 0
+	mov ch, 0
+	mov cl, 2
+	mov al, 1
+	mov ah, 2h
+	
+	int 13h
+	mov si, loaded
+	call print	
+
+	jmp 7d00h
+
+	
+	
+loading: db 'Loading OS into RAM...', 10, 13, 0
+loaded: db 'Jumping to OS...', 10, 13, 10, 13, 0
+
+print: 
+	mov ah, 0eh
+.loop:
+	lodsb
+	cmp al, 0
+	je .done
+	int 10h
+	jmp .loop
+.done:
+	ret
diff --git a/CS3871/os/copy.c b/CS3871/os/copy.c
new file mode 100644
index 0000000..6e21083
--- /dev/null
+++ b/CS3871/os/copy.c
@@ -0,0 +1,95 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+
+int main(argc, argv)
+int argc;
+char ** argv;
+{
+	int val;
+	char buf[512], *dev;
+	int file, floppy;
+
+	if (argc < 3 ) {
+		perror("usage: copy path_to_bootloader path_to_os [path_to_device]\n");
+		exit(1);
+	}
+	if (argc >= 4) {
+		dev = argv[3];
+	} else {
+		dev = "/dev/fd0";
+	}
+
+	memset(buf, 0, 512);
+
+	floppy = open(dev, O_RDWR);
+	if (file < 0) {
+		perror("Could not open floppy: ");
+		exit(1);
+	}
+
+	/******************************
+	 * Write Bootloader to Floppy *
+	 ******************************/
+
+	file = open(argv[1], O_RDONLY);
+	if (file < 0) {
+		perror("Could not open bootloader: ");
+		exit(1);
+	}
+
+	val = read(file, buf, 510);
+	close(file);
+	if (val < 0) {
+		perror("Could not read bootloader: ");
+		exit(1);
+	}
+
+	buf[510] = 0x55;
+	buf[511] = 0xaa;
+
+	lseek(floppy, 0, SEEK_CUR);
+
+	val = write(floppy, buf, 512);
+	if (val < 0) {
+		perror("Error writing to floppy: ");
+		close(floppy);
+		exit(1);
+	}
+	
+
+	/**********************
+ 	 * Write OS to Floppy *
+	 **********************/
+
+	file = open(argv[2], O_RDONLY);
+	if (file < 0) {
+		perror("Could not open os: ");
+		exit(1);
+	}
+
+	val = read(file, buf, 512);
+	close(file);
+	if (val < 0) {
+		perror("Could not read os: ");
+		exit(1);
+	}
+
+	val = write(floppy, buf, 512);
+	if (val < 0) {
+		perror("Error writing to floppy: ");
+		close(floppy);
+		exit(1);
+	}
+
+	syncfs(floppy);
+	close(floppy);
+
+	printf("Floppy successfully copied!\n");
+	return 0;
+}
diff --git a/CS3871/os/os.s b/CS3871/os/os.s
new file mode 100644
index 0000000..c77c583
--- /dev/null
+++ b/CS3871/os/os.s
@@ -0,0 +1,159 @@
+	mov ax, base
+        add ax, 120h
+        mov ss, ax
+	mov sp, 1000h
+
+        mov ax, data           ; Set data segment to safe? area of memory
+        mov ds, ax
+	
+	call clear
+
+	call load_strings
+	mov si, 0h ;promt
+	call print
+	mov di, 30h ;Q
+	
+
+start:
+	mov ah, 0
+	int 16h
+	cmp al, 8
+	je back
+	cmp al, 13
+	je deal_nl
+	call print_char
+	call save_char
+	jmp start
+deal_nl:
+	call print_string
+	mov di, 30h
+	mov si, 10h ;newline
+	call print
+	mov si, 0h ;prompt
+	call print
+	jmp start
+back:
+	dec di
+	call print_char
+	jmp start
+	
+data: db 00h, 20h
+base: db 6h, 66h
+
+print: 
+	mov ah, 0eh
+.loop:
+	lodsb
+	cmp al, 0
+	je .done
+	int 10h
+	jmp .loop
+.done:
+	ret
+
+print_char:
+	mov ah, 0eh
+	int 10h
+	ret
+
+save_char:
+	mov [di], al
+	inc di
+	mov al, 0
+	mov [di], al
+	ret
+
+print_string:
+	mov si, 10h ;newline
+	call print
+	mov si, 20h ;Prog:
+	call print
+	mov si, 30h ;Q
+ps_loop:
+	mov al, [si]
+	cmp al, 0
+	je ps_done
+	cmp al, 32
+	je space
+	call print_char
+	jmp ps_next
+space:
+	mov di, si
+	mov si, 10h ;newline
+	call print
+	mov si, 27h ;Args:
+	call print
+	mov si, di
+	jmp ps_next
+ps_next:
+	inc si
+	jmp ps_loop
+ps_done:
+	ret
+
+clear: 
+	mov ah, 0h
+	int 10h
+	ret
+
+load_strings:
+	mov di, 0h
+	mov byte [di], 'F'
+	inc di
+	mov byte [di], 'l'
+	inc di
+	mov byte [di], 'o'
+	inc di
+	mov byte [di], 'p'
+	inc di
+	mov byte [di], 'p'
+	inc di
+	mov byte [di], 'y'
+	inc di
+	mov byte [di], 'O'
+	inc di
+	mov byte [di], 'S'
+	inc di
+	mov byte [di], '#'
+	inc di
+	mov byte [di], 0
+	
+;NEWLINE 
+	mov di, 10h 
+	mov byte [di], 10
+	inc di
+	mov byte [di], 13
+	inc di
+	mov byte [di], 0
+;PROG:
+	mov di, 20h
+	mov byte [di], 'P'
+	inc di
+	mov byte [di], 'r'
+	inc di
+	mov byte [di], 'o'
+	inc di
+	mov byte [di], 'g'
+	inc di
+	mov byte [di], ':'
+	inc di
+	mov byte [di], ' '
+	inc di
+	mov byte [di], 0
+	inc di
+	
+;ARGS	
+	mov byte [di], 'A'
+	inc di
+	mov byte [di], 'r'
+	inc di
+	mov byte [di], 'g'
+	inc di
+	mov byte [di], 's'
+	inc di
+	mov byte [di], ':'
+	inc di
+	mov byte [di], ' '
+	inc di
+	mov byte [di], 0
+ret