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Add some code which can be used to change to/from physical mode when

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calling various firmware functions.
This commit is contained in:
Doug Rabson 2001-09-24 17:07:23 +00:00
parent 4c47cadb49
commit a7f1f8b902
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=83893
2 changed files with 134 additions and 0 deletions
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67
sys/ia64/ia64/support.S
View file

@ -53,10 +53,77 @@
*/
#include <machine/asm.h>
#include <machine/ia64_cpu.h>
#include <assym.s>
.text
/*
* ia64_change_mode: change mode to/from physical mode
*
* Arguments:
* r14 psr for desired mode
*/
ENTRY(ia64_change_mode, 0)
rsm psr.i | psr.ic
mov ar.rsc=0 // turn off RSE
tbit.nz p6,p7=r14,17 // physical or virtual ?
;;
(p6) mov r15=7 // RR base for virtual addresses
(p7) mov r15=0 // RR base for physical addresses
flushrs // no dirty registers please
srlz.i
;;
mov r16=ar.bsp
mov r17=rp
mov r18=ar.rnat
;;
dep r16=r15,r16,61,3 // new address of ar.bsp
dep r17=r15,r17,61,3 // new address of rp
;;
mov ar.bspstore=r16
mov rp=r17
;;
1: mov r16=ip
mov ar.rnat=r18
mov cr.ipsr=r14 // psr for physical mode
;;
add r16=2f-1b,r16 // address to rfi to
;;
dep r16=r15,r16,61,3 // physical
;;
mov cr.iip=r16 // setup for rfi
mov cr.ifs=r0
;;
rfi
2: br.ret.sptk.few rp // now in physical mode
END(ia64_change_mode)
/*
* ia64_physical_mode: change mode to physical mode
*
* Return:
* ret0 psr to restore
*/
ENTRY(ia64_physical_mode, 0)
mov r14=psr
mov ret0=psr
movl r15=(IA64_PSR_I|IA64_PSR_IT|IA64_PSR_DT|IA64_PSR_RT)
movl r16=IA64_PSR_BN
;;
andcm r14=r14,r15 // clear various xT bits
;;
or r14=r14,r16 // make sure BN=1
or ret0=ret0,r16 // make sure BN=1
br.cond.sptk.many ia64_change_mode
END(ia64_physical_mode)
/**************************************************************************/
/*

67
sys/ia64/ia64/support.s
View file

@ -53,10 +53,77 @@
*/
#include <machine/asm.h>
#include <machine/ia64_cpu.h>
#include <assym.s>
.text
/*
* ia64_change_mode: change mode to/from physical mode
*
* Arguments:
* r14 psr for desired mode
*/
ENTRY(ia64_change_mode, 0)
rsm psr.i | psr.ic
mov ar.rsc=0 // turn off RSE
tbit.nz p6,p7=r14,17 // physical or virtual ?
;;
(p6) mov r15=7 // RR base for virtual addresses
(p7) mov r15=0 // RR base for physical addresses
flushrs // no dirty registers please
srlz.i
;;
mov r16=ar.bsp
mov r17=rp
mov r18=ar.rnat
;;
dep r16=r15,r16,61,3 // new address of ar.bsp
dep r17=r15,r17,61,3 // new address of rp
;;
mov ar.bspstore=r16
mov rp=r17
;;
1: mov r16=ip
mov ar.rnat=r18
mov cr.ipsr=r14 // psr for physical mode
;;
add r16=2f-1b,r16 // address to rfi to
;;
dep r16=r15,r16,61,3 // physical
;;
mov cr.iip=r16 // setup for rfi
mov cr.ifs=r0
;;
rfi
2: br.ret.sptk.few rp // now in physical mode
END(ia64_change_mode)
/*
* ia64_physical_mode: change mode to physical mode
*
* Return:
* ret0 psr to restore
*/
ENTRY(ia64_physical_mode, 0)
mov r14=psr
mov ret0=psr
movl r15=(IA64_PSR_I|IA64_PSR_IT|IA64_PSR_DT|IA64_PSR_RT)
movl r16=IA64_PSR_BN
;;
andcm r14=r14,r15 // clear various xT bits
;;
or r14=r14,r16 // make sure BN=1
or ret0=ret0,r16 // make sure BN=1
br.cond.sptk.many ia64_change_mode
END(ia64_physical_mode)
/**************************************************************************/
/*