Save work

build.sh

@@ -1,6 +1,15 @@
 bcc -S main.c
-echo -e "jmp _main\n$(cat main.s)" > main.s
+echo -e "push bp
+	     mov bp,sp
+	     push 12[bp]
+	     push 10[bp]
+	     push 8[bp]
+	     push 6[bp]
+	     call _main
+	     add sp, 0x4
+	     pop bp
+	     retf $(cat main.s)" > main.s
 sed -i '/.globl	___mkargv/d' ./main.s
 sed -i '/.globl	_environ/d' ./main.s
-sed -i '/.data/d' ./main.s
+sed -i '/^.data$/d' ./main.s
 as86 -b disk.out main.s

driver/disk.h

@@ -1,33 +1,64 @@
+int data_from_disk(index, number_sectors, data_buffer, data_buffer_segment);
+int sec_stub();
+int stub(index, number_sectors, data_buffer, data_buffer_segment);
 
-int disk_service_read_data_from_disk(index, file_block_size, data_buffer, data_buffer_segment) 
+int stub(index, number_sectors, data_buffer, data_buffer_segment)
 long* index; 
-long file_block_size; 
+long number_sectors; 
 void* data_buffer;
 int data_buffer_segment;
 {
-    //fseek ( disk, (index * SECTOR_SIZE ), SEEK_SET ); // SEEK_SET start offset at index 0 and move 1 * SECTOR_SIZE, and write here.
-    //int read = fread(data_buffer, 1, (file_block_size * SECTOR_SIZE), disk);
-    //return read;
+
 	#asm
+	#define index 4[bp];
+    #define number_sectors 6[bp];
+    #define data_buffer 8[bp];
+    #define data_buffer_segment 10[bp];
+	
+	push bp
+    mov bp,sp
+	pusha
+	//mov ax, ds 
+	//call 0x0000:0x7C2A
+	//mov ax, DAPACK
+	//call 0x0000:0x7C2A
+	mov ax, #DAPACK
+	call 0x0000:0x7C2A
+
 	lsfs_load_data:
-    mov dl, [global_disk_identifier]
+	    mov ax, index
 	    mov WORD [DAPACK.lba_addr_dw_low], ax
-    mov WORD [DAPACK.blkcnt],          0x01  
-    mov WORD [DAPACK.db_addr_segment], bx
-    mov WORD [DAPACK.db_addr_offset],  FSCI
-    mov si, DAPACK                          ; address of "disk address packet"
-    mov ah, 0x42                            ; READ
+	    mov bx, number_sectors
+	    mov WORD [DAPACK.blkcnt],          bx
+	    mov cx, data_buffer_segment  
+	    mov WORD [DAPACK.db_addr_segment], cx
+	    mov dx, data_buffer;
+	    mov WORD [DAPACK.db_addr_offset],  dx
+	    mov si, #DAPACK                          ; address of
+	    mov ah, #0x42                            ; READ
 	    mov dl, [global_disk_identifier] 
-    int 0x13
+	    int #0x13
+	call 0x0000:0x7C2A	
+	popa
+	pop bp
+	ret
+
 
 	DAPACK:
-	  .dap_Size:         db  0x10   ; This is always 16 bytes (0x10)
-	  .rev_byte:         db  0x0    ; reserved byte, should always be zero
-	  .blkcnt:           dw  0x0    ; int 13 resets this to # of blocks actually read/written
-	  .db_addr_offset:   dw  0x0    ; memory buffer destination address (0:7c00)
-	  .db_addr_segment:  dw  0x0    ; in memory page zero
-	  .lba_addr_dw_low:  dd  0x0    ; put the lba to read in this spot
-	  .lba_addr_dw_high: dd  0x0    ; more storage bytes only for big lba's ( > 4 bytes )
+	  DAPACK.dap_Size:         db  0x10 
+	  DAPACK.rev_byte:         db  0x0  
+	  DAPACK.blkcnt:           dw  0x0  
+	  DAPACK.db_addr_offset:   dw  0x0  
+	  DAPACK.db_addr_segment:  dw  0x0  
+	  DAPACK.lba_addr_dw_low:  dd  0x0  
+	  DAPACK.lba_addr_dw_high: dd  0x0  
+	
+	global_disk_identifier: db 0x80
+
 	#endasm
+} 
 
+int sec_stub() 
+{
+	return 42;
 }

main.c

@@ -18,6 +18,7 @@
 #define NUM_DATA_POINTERS 27 
 
 void dump_ax(input);
+void print_stack(argument);
 
 typedef struct Directory_Table Directory_Table;
 typedef struct struct_table_entry struct_table_entry;
@@ -62,8 +63,9 @@ struct test
 int argument;
 void print(argument);
 
-int main(selector, path, path_segment) 
+int main(selector, path, path_segment, fsci_lba_index) 
 int path_segment;
+int fsci_lba_index;
 char path[256];
 {
 	// selectot should be a "selector" for which disk service
@@ -73,8 +75,10 @@ char path[256];
 	int local_segment = 0x7e0;
 	char* local_path = "Hello world\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
 	struct test my_struct;
-	char *hello = "LessSimpleFileSystem";
+	char *fs_info;
+	char *hello = "LessSimpleFileSystem_Hello";
 	char *yes = "Read file: ";
+	int nubmer;
 
 
 	my_struct.first = hello;
@@ -86,10 +90,19 @@ char path[256];
 		FSCI fsci;
 		print(my_struct.first);
 		print(my_struct.second);
-		strcpy(local_path, local_segment, path, path_segment);
+		//strcpy(local_path, local_segment, path, path_segment);
 		print(local_path);
-		fsci.master_table_index[0] = 32;
-		dump_ax(fsci.master_table_index[0]);
+		fsci.master_table_index[0] = 42;
+		nubmer = 0x55;
+		//dump_ax(fsci.master_table_index[0]);
+		dump_ax(nubmer);
+		fsci.filesystem_information[0] = 'i';
+		fsci.filesystem_information[1] = '\0';
+		stub(fsci_lba_index, 1, &fsci, 0x8fc0);
+		fs_info = fsci.filesystem_information;
+		//dump_ax(&fsci);
+		print_stack( fs_info );
+		//dump_ax(fsci.master_table_index[0]);
 	}
 	else 
 	{
@@ -112,6 +125,25 @@ void print(argument)
 #endasm
 }
 
+void print_stack(argument)
+{
+#asm 
+ 	push bp
+	mov	bp,sp
+	push ds
+	push ax
+
+	mov ax, ss
+	mov ds, ax
+	mov	si,4[bp]
+	call 0x0000:0x7C47
+	
+	pop ax
+	pop ds
+	pop bp
+#endasm
+}
+
 dump_ax_return(input)
 void* input;
 {
@@ -124,6 +156,9 @@ void* input;
 	// Force the variable in ax 
 	dump_ax_return(input)
 #asm
+	push bp
+	mov	bp,sp
 	call 0x000:0x7C2A
+	pop bp
 #endasm
 }

std_singos/string.h

@@ -34,7 +34,7 @@ int source_segment;
         mov si, ax
         mov ax, SOURCE_SEGMENT; 
         mov ds, ax
-        mov cx, 0x050
+        mov cx, 0x050 // TODO(Jørn) Hardcded number of bytes to copy
     .loop:
         movsb
         cmp cx, 0x0