[Qemu-devel] [Bug 659276] [NEW] Accessing Century byte via RTC

[Ian Seyler]

Public bug reported:

With the RTC configure for Binary instead of BCD I am getting the
incorrect result for Century.

        mov al, 0x0B                    ; Set RTC to binary mode
        out 0x70, al
        in al, 0x71
        bts ax, 2
        mov bl, al
        mov al, 0x0B
        out 0x70, al
        mov al, bl
        out 0x71, al

        mov al, 0x32                    ; Century
        out 0x70, al
        in al, 0x71

In QEMU 0.12.5 it returns 0x20 but should return 0x14. The following
work correctly:

        mov al, 0x09                    ; Year
        out 0x70, al
        in al, 0x71

        mov al, 0x08                    ; Month
        out 0x70, al
        in al, 0x71

        mov al, 0x07                    ; Day
        out 0x70, al
        in al, 0x71

** Affects: qemu
     Importance: Undecided
         Status: New

-- 
Accessing Century byte via RTC
https://bugs.launchpad.net/bugs/659276
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Status in QEMU: New

Bug description:
With the RTC configure for Binary instead of BCD I am getting the incorrect 
result for Century.

        mov al, 0x0B                    ; Set RTC to binary mode
        out 0x70, al
        in al, 0x71
        bts ax, 2
        mov bl, al
        mov al, 0x0B
        out 0x70, al
        mov al, bl
        out 0x71, al

        mov al, 0x32                    ; Century
        out 0x70, al
        in al, 0x71

In QEMU 0.12.5 it returns 0x20 but should return 0x14. The following work 
correctly:

        mov al, 0x09                    ; Year
        out 0x70, al
        in al, 0x71

        mov al, 0x08                    ; Month
        out 0x70, al
        in al, 0x71

        mov al, 0x07                    ; Day
        out 0x70, al
        in al, 0x71