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Annotation of hatari/src/cart.c, revision 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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