On Mon, 3 Jun 2013 09:28:07 -0500, Paul Gilmartin wrote: >I understand that some of Java has migrated to within the bar
Why do you continue to refer to the area between 2GB and 4GB as "Within the bar"? While it is true that some early presentations depicted the bar as having a "thickness" of 2 GB, AFAIK, it was never documented that way in any IBM manual. Rather, the manuals describe the area above 2 GB as "above the bar". For example, the Extended Addressability Guide for z/OS release 2 has this definition of the bar: <quote> bar. A virtual line that marks the 2-gigabyte address in a 64-bit address space. It separates virtual storage below the 2-gigabyte address (called "below the bar") from virtual storage above the 2-gigabyte line (called "above the bar")." </quote> And in the description of the IARV64 macro in the Assembler Services Guide for z/OS release 2 there is this description: <quote> The two gigabyte address in the address space is marked by a virtual line called the bar. The bar separates storage below the two gigabyte address, called below the bar, from storage above the two gigabyte address, called above the bar. </quote> In any case, the area that has been reserved for Java is (IIRC) from 2GB to 32 GB, well beyond 4 GB. >in order to >employ 32-bit addressing without triggering further below the bar VSCR. There is no such thing as "32-bit addressing". Addresses in z/Architecture are either 24, 31 or 64 bits. -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
