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Jørn Guldberg committed
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@@ -1,6 +1,15 @@
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bcc -S main.c
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echo -e "jmp _main\n$(cat main.s)" > main.s
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echo -e "push bp
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mov bp,sp
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push 12[bp]
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push 10[bp]
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push 8[bp]
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push 6[bp]
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call _main
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add sp, 0x4
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pop bp
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retf $(cat main.s)" > main.s
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sed -i '/.globl ___mkargv/d' ./main.s
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sed -i '/.globl _environ/d' ./main.s
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sed -i '/.data/d' ./main.s
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sed -i '/^.data$/d' ./main.s
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as86 -b disk.out main.s
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+57
-26
@@ -1,33 +1,64 @@
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int data_from_disk(index, number_sectors, data_buffer, data_buffer_segment);
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int sec_stub();
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int stub(index, number_sectors, data_buffer, data_buffer_segment);
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int disk_service_read_data_from_disk(index, file_block_size, data_buffer, data_buffer_segment)
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int stub(index, number_sectors, data_buffer, data_buffer_segment)
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long* index;
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long file_block_size;
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long number_sectors;
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void* data_buffer;
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int data_buffer_segment;
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{
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//fseek ( disk, (index * SECTOR_SIZE ), SEEK_SET ); // SEEK_SET start offset at index 0 and move 1 * SECTOR_SIZE, and write here.
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//int read = fread(data_buffer, 1, (file_block_size * SECTOR_SIZE), disk);
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//return read;
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#asm
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lsfs_load_data:
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mov dl, [global_disk_identifier]
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mov WORD [DAPACK.lba_addr_dw_low], ax
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mov WORD [DAPACK.blkcnt], 0x01
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mov WORD [DAPACK.db_addr_segment], bx
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mov WORD [DAPACK.db_addr_offset], FSCI
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mov si, DAPACK ; address of "disk address packet"
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mov ah, 0x42 ; READ
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mov dl, [global_disk_identifier]
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int 0x13
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DAPACK:
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.dap_Size: db 0x10 ; This is always 16 bytes (0x10)
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.rev_byte: db 0x0 ; reserved byte, should always be zero
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.blkcnt: dw 0x0 ; int 13 resets this to # of blocks actually read/written
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.db_addr_offset: dw 0x0 ; memory buffer destination address (0:7c00)
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.db_addr_segment: dw 0x0 ; in memory page zero
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.lba_addr_dw_low: dd 0x0 ; put the lba to read in this spot
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.lba_addr_dw_high: dd 0x0 ; more storage bytes only for big lba's ( > 4 bytes )
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#endasm
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#asm
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#define index 4[bp];
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#define number_sectors 6[bp];
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#define data_buffer 8[bp];
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#define data_buffer_segment 10[bp];
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push bp
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mov bp,sp
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pusha
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//mov ax, ds
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//call 0x0000:0x7C2A
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//mov ax, DAPACK
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//call 0x0000:0x7C2A
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mov ax, #DAPACK
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call 0x0000:0x7C2A
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lsfs_load_data:
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mov ax, index
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mov WORD [DAPACK.lba_addr_dw_low], ax
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mov bx, number_sectors
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mov WORD [DAPACK.blkcnt], bx
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mov cx, data_buffer_segment
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mov WORD [DAPACK.db_addr_segment], cx
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mov dx, data_buffer;
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mov WORD [DAPACK.db_addr_offset], dx
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mov si, #DAPACK ; address of
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mov ah, #0x42 ; READ
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mov dl, [global_disk_identifier]
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int #0x13
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call 0x0000:0x7C2A
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popa
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pop bp
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ret
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DAPACK:
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DAPACK.dap_Size: db 0x10
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DAPACK.rev_byte: db 0x0
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DAPACK.blkcnt: dw 0x0
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DAPACK.db_addr_offset: dw 0x0
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DAPACK.db_addr_segment: dw 0x0
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DAPACK.lba_addr_dw_low: dd 0x0
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DAPACK.lba_addr_dw_high: dd 0x0
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global_disk_identifier: db 0x80
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#endasm
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}
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int sec_stub()
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{
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return 42;
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}
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@@ -18,6 +18,7 @@
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#define NUM_DATA_POINTERS 27
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void dump_ax(input);
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void print_stack(argument);
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typedef struct Directory_Table Directory_Table;
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typedef struct struct_table_entry struct_table_entry;
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@@ -40,16 +41,16 @@ int selector;
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struct File_System_Control_Information
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{
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char filesystem_information[256];
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long master_table_index[2];
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long this_partition_offset_on_disk[2];
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long next_free_sector[2];
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long next_uniqe_id[2]; // both files and directories gets this.
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long next_sector_reuse_pointer[2];
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long last_sector_index_on_partition[2];
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long maximum_sectors_on_disk[2];
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long sector_size_on_disk[2];
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long not_used[48];
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char filesystem_information[256];
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long master_table_index[2];
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long this_partition_offset_on_disk[2];
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long next_free_sector[2];
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long next_uniqe_id[2]; // both files and directories gets this.
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long next_sector_reuse_pointer[2];
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long last_sector_index_on_partition[2];
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long maximum_sectors_on_disk[2];
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long sector_size_on_disk[2];
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long not_used[48];
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};
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@@ -62,8 +63,9 @@ struct test
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int argument;
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void print(argument);
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int main(selector, path, path_segment)
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int main(selector, path, path_segment, fsci_lba_index)
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int path_segment;
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int fsci_lba_index;
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char path[256];
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{
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// selectot should be a "selector" for which disk service
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@@ -73,8 +75,10 @@ char path[256];
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int local_segment = 0x7e0;
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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";
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struct test my_struct;
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char *hello = "LessSimpleFileSystem";
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char *fs_info;
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char *hello = "LessSimpleFileSystem_Hello";
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char *yes = "Read file: ";
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int nubmer;
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my_struct.first = hello;
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@@ -86,10 +90,19 @@ char path[256];
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FSCI fsci;
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print(my_struct.first);
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print(my_struct.second);
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strcpy(local_path, local_segment, path, path_segment);
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//strcpy(local_path, local_segment, path, path_segment);
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print(local_path);
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fsci.master_table_index[0] = 32;
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dump_ax(fsci.master_table_index[0]);
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fsci.master_table_index[0] = 42;
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nubmer = 0x55;
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//dump_ax(fsci.master_table_index[0]);
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dump_ax(nubmer);
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fsci.filesystem_information[0] = 'i';
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fsci.filesystem_information[1] = '\0';
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stub(fsci_lba_index, 1, &fsci, 0x8fc0);
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fs_info = fsci.filesystem_information;
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//dump_ax(&fsci);
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print_stack( fs_info );
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//dump_ax(fsci.master_table_index[0]);
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}
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else
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{
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@@ -106,12 +119,31 @@ void print(argument)
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#asm
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push bp
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mov bp,sp
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mov si,4[bp]
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mov si,4[bp]
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call 0x0000:0x7C47
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pop bp
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#endasm
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}
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void print_stack(argument)
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{
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#asm
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push bp
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mov bp,sp
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push ds
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push ax
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mov ax, ss
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mov ds, ax
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mov si,4[bp]
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call 0x0000:0x7C47
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pop ax
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pop ds
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pop bp
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#endasm
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}
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dump_ax_return(input)
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void* input;
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{
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@@ -124,6 +156,9 @@ void* input;
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// Force the variable in ax
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dump_ax_return(input)
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#asm
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push bp
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mov bp,sp
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call 0x000:0x7C2A
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pop bp
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#endasm
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}
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+1
-1
@@ -34,7 +34,7 @@ int source_segment;
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mov si, ax
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mov ax, SOURCE_SEGMENT;
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mov ds, ax
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mov cx, 0x050
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mov cx, 0x050 // TODO(Jørn) Hardcded number of bytes to copy
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.loop:
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movsb
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cmp cx, 0x0
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