Return to read_cmos.s CVS log

Up to [MW Coherent from dump] / coherent / d / conf / tboot / Examples

Annotation of coherent/d/conf/tboot/Examples/read_cmos.s, revision 1.1

1.1     ! root        1: CMOSA  =       0x70    / Real-time Clock/CMOS addr I/O port.
        !             2: CMOSD  =       0x71    / Real-time Clock/CMOS data I/O port.
        !             3: /
        !             4: /       Read a byte from the CMOS.  Takes one argument--the
        !             5: /       CMOS address to read from as an int; returns the
        !             6: /       value read as a char.
        !             7: /
        !             8:         .globl read_cmos_
        !             9: read_cmos_:
        !            10:        push    si
        !            11:        push    di
        !            12:         push    bp
        !            13:         mov     bp, sp
        !            14:         movb    al, 8(bp)       / Fetch address from stack.
        !            15:         outb    CMOSA, al       / Send address to CMOS.
        !            16:         jmp     .+2             / DELAY
        !            17:         inb     al, CMOSD       / Get Value from CMOS.
        !            18:        movb    ah, $0
        !            19:         pop     bp
        !            20:        pop     di
        !            21:        pop     si
        !            22:         ret                     / Return from read_cmos().
        !            23: 

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.