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Annotation of hatari/src/cart.c, revision 1.1.1.1

1.1       root        1: /*
                      2:   Hatari
                      3: 
                      4:   Cartridge Pexec program
                      5: 
                      6:   To load programs into memory, through TOS, we need to intercept GEMDOS so we can
                      7:   relocate/execute programs via GEMDOS call $4B(PExec).
                      8:   We have some 68000 assembler, located at 0xFA1000(cartridge memory), which is used as our
                      9:   new GEMDOS handler. This checks if we need to intercept the call.
                     10:   You'll notice PaCifiST has a 'cartridge' icon on screen, which contains a program called
                     11:   'Don't run me' - this is a similar routine used for loading.
                     12:   This assembler routine needs modifying according to the TOS image we have selected to ensure
                     13:   compatibility with the rest of TOS(TOS assumes the disc sector is read into a set workspace
                     14:   address)
                     15: 
                     16:   The assembler routine is called 'cart.s', and has been converted to a byte array and stored
                     17:   in 'cartimg.c'.
                     18: */
                     19: 
                     20: #include "main.h"
                     21: #include "cart.h"
                     22: #include "decode.h"
                     23: #include "m68000.h"
                     24: #include "misc.h"
                     25: #include "stMemory.h"
                     26: 
                     27: #include "cartimg.c"                   /* Cartridge program used as inferface to PC system */
                     28: 
                     29: 
                     30: /*-----------------------------------------------------------------------*/
                     31: /*
                     32:   Load ST GEMDOS intercept program image into cartridge memory space
                     33:   This is used as an interface to the PC file system and for GemDOS
                     34: */
                     35: void Cart_LoadImage(void)
                     36: {
                     37:   /* Copy 'cart.img' file into ST's cartridge memory */
                     38:   memcpy((char *)STRam+0xFA1000,cart_img,sizeof(cart_img));
                     39: }
                     40: 
                     41: 
                     42: /*-----------------------------------------------------------------------*/
                     43: /*
                     44:   Modify program loaded into cartridge memory to set where load sectors from disc image -
                     45:   this value MUST correspond with where the TOS version assumes it will be loaded
                     46: 
                     47:   We can find this by looking for hdv_boot function(see tos.cpp),move.l <addr>,$47A(a5)
                     48:   and then follow code for move.l #<value>,-(sp) and jsr <floprd>
                     49: */
                     50: void Cart_WriteHdvAddress(unsigned short int HdvAddress)
                     51: {
                     52:   STMemory_WriteWord(CART_HDV_ADDR_1,HdvAddress);
                     53:   STMemory_WriteWord(CART_HDV_ADDR_2,HdvAddress);
                     54: }

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