* [Linux-ia64] EFI/SAL question
@ 2002-11-14 11:30 Christian Hildner
2002-11-14 18:39 ` David Mosberger
0 siblings, 1 reply; 2+ messages in thread
From: Christian Hildner @ 2002-11-14 11:30 UTC (permalink / raw)
To: linux-ia64
Hi,
does EFI (runtime services) or SAL calls use the global pointer? If yes,
how must gp initialized before doing the call (from assembly)?
Christian
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Linux-ia64] EFI/SAL question
2002-11-14 11:30 [Linux-ia64] EFI/SAL question Christian Hildner
@ 2002-11-14 18:39 ` David Mosberger
0 siblings, 0 replies; 2+ messages in thread
From: David Mosberger @ 2002-11-14 18:39 UTC (permalink / raw)
To: linux-ia64
>>>>> On Thu, 14 Nov 2002 12:30:34 +0100, Christian Hildner <christian.hildner@hob.de> said:
Christian> Hi, does EFI (runtime services) or SAL calls use the
Christian> global pointer? If yes, how must gp initialized before
Christian> doing the call (from assembly)?
Yes, both use GP. For SAL, the GP is provided via the
SAL_DESC_ENTRY_POINT descriptor (page 419 in the ia64 linux kernel
book). For EFI, the runtime services routines are given as normal
function pointers (so they contain both code entry point and gp).
--david
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