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Annotation of coherent/a/usr/include.b4ps2/sys/fakeff.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * fakeff.h
        !             3:  * Include file to simulate all the far memory calls from COH 286.
        !             4:  * Far pointers are simulated with virtual addresses.
        !             5:  */
        !             6: #ifndef FAKEFF_H       /* Rest of file.  */
        !             7: #define FAKEFF_H
        !             8: 
        !             9: typedef        unsigned long   faddr_t;
        !            10: 
        !            11: /*
        !            12:  * Read a byte from far address 'fp'.  Note that if an address fault
        !            13:  * occurs, the system will panic.
        !            14:  */
        !            15: #define ffbyte(fp)     (*((unsigned char *) (fp)))
        !            16: 
        !            17: /*
        !            18:  * Read a word from far address 'fp'.  Note that if an address fault
        !            19:  * occurs, the system will panic.
        !            20:  */
        !            21: #define ffword(fp)     (*((unsigned short *) (fp)))
        !            22: 
        !            23: /*
        !            24:  * Copy 'n' bytes from far address 'fp' to address 'k' in the kernel
        !            25:  * data segment.  Returns the number of bytes copied.
        !            26:  * Note that if an address fault occurs, the system will panic.
        !            27:  */
        !            28: #define fkcopy(fp, k, n)       kkcopy(fp, k, n)
        !            29: 
        !            30: /*
        !            31:  * Copy 'count' bytes from 'from_fp' to 'to_fp'.
        !            32:  * Note that if an address fault occurs, the system will panic.
        !            33:  */
        !            34: #define ffcopy(from_fp, to_fp, count)  (void) kkcopy(from_fp, to_fp, count)
        !            35: 
        !            36: /*
        !            37:  * Write byte 'b' to address 'fp'.  Note that if an address
        !            38:  * fault occurs, the system will panic.
        !            39:  */
        !            40: #define sfbyte(fp, b)  {*(unsigned char *)(fp) = (unsigned char)(b);}
        !            41: 
        !            42: /*
        !            43:  * Write word 'w' to address 'fp'.  Note that if an address
        !            44:  * fault occurs, the system will panic.
        !            45:  */
        !            46: #define sfword(fp, w)  {*((unsigned short *)(fp)) = (unsigned short)(w);}
        !            47: 
        !            48: faddr_t ptov();
        !            49: void vrelse();
        !            50: 
        !            51: #endif /* FAKEFF_H */

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