On Mon, 18 Jul 2011 14:45:35 +0000, Bob Shannon wrote: >>He did not say the PC instruction will not work above the bar > >The Entry Table Entry for a PC routine has not been expanded to 64 bits. Until >it is, a PC routine cannot be above the Bar. It appears that Amode 64 is >supported (but not documented) but the PC routine cannot reside above the Bar > Is this a hardware restriction?
I had thought the hardware design was running far ahead of the software in erasing all the lines and bars. I suppose a linkage vector could reside below the bar and the bulk of the code above. I also thought that Linux for z was free of 31- and 24-bit dependencies. What facility (branch, SVC, or PC) does Linux use for system requests? (It can't be purely branch because it's necessary at some point to enter Supervisor state.) -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
