On Thu, 2014-08-28 at 20:33 +1000, Benjamin Herrenschmidt wrote: > On Thu, 2014-08-28 at 12:29 +0200, Alexander Graf wrote: > > > > On 28.08.14 12:21, Benjamin Herrenschmidt wrote: > > > On Thu, 2014-08-28 at 10:36 +0200, Alexander Graf wrote: > > > > > >> So why not put it at 0x7000 then? > > > > > > Because PAPR says it has to be inside RTAS iirc > > > > Please show me the section of PAPR that does say so. > > Actually, we should probably support both options: > > PAPR V2.7 > > 7.3.14 Firmware Assisted Non-Maskable Interrupts Option (FWNMI) > > << > The difference between ibm,nmi-register and ibm,nmi-register-2 is that > ibm,nmi-register allocates the error reporting > structure in RTAS space while ibm,nmi-register-2 places the error > reporting structure in real page 7. New OS designs > should use ibm,nmi-register since support for ibm,nmi-register-2 will be > terminated at some future date. > >>
Also of interest: << As with all first level interrupt service routines, the SPRG-2 register is used to save the state of one general purpose register while the processor computes the location of its state save area. >> Cheers, Ben. > > Cheers, > Ben. >
