Subversion Repositories planix.SVN

#define TBRL    268
#define TBRU    269             /* Time base Upper/Lower (Reading) */

/*
 * time stamp counter; _cycles since power up
 * Runs at fasthz/4 cycles per second (m->clkin>>3)
 */
TEXT cycles(SB),1,$0
loop:
        MOVW    SPR(TBRU),R7
        MOVW    SPR(TBRL),R8
        MOVW    SPR(TBRU),R5
        CMP     R5,R7
        BNE     loop
        MOVW    R7,0(R3)
        MOVW    R8,4(R3)
        RETURN