lsfs_16-bit/main.c

// Adress to dump ax, 7C2A
// Address to print 7C47
//
//

#include "std_singos/string.h"
#include "driver/disk.h"

#define SPACE_MBR_RECORD 2048 // Sectors
#define SPACE_VBR_RECORD 2048 // Sectors
#define SIZE_FSCI_RECORD    1 // Sectors
#define DEFAULT_ENTRY_SIZE  1 // Sectors
#define SECTOR_SIZE 512 // BYTES
#define NUMBER_OF_MBR_PARTITIONS 4
#define DEFAULT_FILE_SIZE 4 // This is in sectors
#define DEFAULT_DATA_POINTER_SIZE 4 // This is in sectors
#define DEFAULT_TABLE_SIZE 16 
#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;
typedef struct struct_partition_control partition_control;
typedef struct File_System_Control_Information FSCI;
typedef struct meta_information_format mif;
typedef struct tag_record tag_record;
typedef struct lsfs_file lsfs_file;

typedef enum Table_Entry_Kind
{
    // These are specific values since, is has to corrospond to the implementation in assembly
    ENTRY_EMPTY = 0,
    ENTRY_FILE = 1,
    ENTRY_DIRECTORY = 2,
} Table_Entry_Kind;

int number_low;
int selector;

struct File_System_Control_Information 
{
    char filesystem_information[256];
    long master_table_index[2];
    long this_partition_offset_on_disk[2];
    long next_free_sector[2];
    long next_uniqe_id[2]; // both files and directories gets this. 
    long next_sector_reuse_pointer[2];
    long last_sector_index_on_partition[2];
    long maximum_sectors_on_disk[2];
    long sector_size_on_disk[2];
    long not_used[48];

};

struct test
{
	char* first;
	char* second;
};

int argument;
void print(argument);

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
	// one wnats to use. 
	// 0 should not be used, to try to ensure that a value has been set explicitly.  

	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 *fs_info;
	char *hello = "LessSimpleFileSystem_Hello";
	char *yes = "Read file: ";
	int nubmer;


	my_struct.first = hello;
	my_struct.second = yes;
	
	if (selector == 1) 
	{
		// SERVICE: READ FILE
		FSCI fsci;
		print(my_struct.first);
		print(my_struct.second);
		//strcpy(local_path, local_segment, path, path_segment);
		print(local_path);
		fsci.master_table_index[0] = 42;
		nubmer = 0x55;
		//dump_ax(fsci.master_table_index[0]);
		//dump_ax(nubmer);
		//fsci_lba_index = 0x1000;
		fsci.filesystem_information[0] = 'i';
		fsci.filesystem_information[1] = '\0';
		dump_ax(fsci_lba_index);
		stub(fsci_lba_index, 1, &fsci, 0x8fc0);
		//fs_info = fsci.filesystem_information;
		//dump_ax(&fsci);
		print_stack(fsci.filesystem_information);
		dump_ax(fsci.master_table_index[0]);
	}
	else 
	{
		print(my_struct.first);
		return 0;
	}	

	return 0;

}

void print(argument)
{
#asm 
 	push bp
	mov	bp,sp
	mov	si,4[bp]
	call 0x0000:0x7C47
	pop bp
#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;
{
	return input;
}

void dump_ax(input)
void* input;
{
	// Force the variable in ax 
	dump_ax_return(input)
#asm
	push bp
	mov	bp,sp
	call 0x000:0x7C2A
	pop bp
#endasm
}