* Preserve ar.rsc in ia64_change_mode.
* Convert sp to/from physical in ia64_change_mode. * Add a shim for calling EFI procedures in virtual mode.
This commit is contained in:
Doug Rabson
parent
0e671be22e
commit
27272270e8
@ -63,13 +63,18 @@
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*
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* Arguments:
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* r14 psr for desired mode
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*
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* Modifies:
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* r15-r19 scratch
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* ar.bsp tranlated to new mode
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*/
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ENTRY(ia64_change_mode, 0)
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rsm psr.i | psr.ic
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mov ar.rsc=0 // turn off RSE
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mov r19=ar.rsc // save rsc while we change mode
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tbit.nz p6,p7=r14,17 // physical or virtual ?
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;;
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mov ar.rsc=0 // turn off RSE
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(p6) mov r15=7 // RR base for virtual addresses
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(p7) mov r15=0 // RR base for physical addresses
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flushrs // no dirty registers please
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@ -81,6 +86,7 @@ ENTRY(ia64_change_mode, 0)
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;;
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dep r16=r15,r16,61,3 // new address of ar.bsp
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dep r17=r15,r17,61,3 // new address of rp
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dep sp=r15,sp,61,3 // new address of sp
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;;
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mov ar.bspstore=r16
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mov rp=r17
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@ -98,7 +104,8 @@ ENTRY(ia64_change_mode, 0)
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;;
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rfi
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2: br.ret.sptk.few rp // now in new mode
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2: mov ar.rsc=r19 // restore ar.rsc
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br.ret.sptk.few rp // now in new mode
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END(ia64_change_mode)
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@ -107,12 +114,17 @@ END(ia64_change_mode)
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*
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* Return:
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* ret0 psr to restore
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*
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* Modifies:
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* r15-r18 scratch
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* ar.bsp tranlated to physical mode
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* psr.i cleared
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*/
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ENTRY(ia64_physical_mode, 0)
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mov r14=psr
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mov ret0=psr
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movl r15=(IA64_PSR_I|IA64_PSR_IT|IA64_PSR_DT|IA64_PSR_RT)
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movl r15=(IA64_PSR_I|IA64_PSR_IT|IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_DFL|IA64_PSR_DFH)
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movl r16=IA64_PSR_BN
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;;
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andcm r14=r14,r15 // clear various xT bits
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@ -124,6 +136,51 @@ ENTRY(ia64_physical_mode, 0)
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END(ia64_physical_mode)
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/*
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* ia64_call_efi_physical: call an EFI procedure in physical mode
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*
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* Arguments:
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* in0 Address of EFI procedure descriptor
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* in1-in5 Arguments to EFI procedure
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*
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* Return:
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* ret0-ret3 return values from EFI
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*
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*/
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ENTRY(ia64_call_efi_physical, 6)
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alloc loc0=ar.pfs,6,4,5,0
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;;
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mov loc1=rp
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;;
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br.call.sptk.many rp=ia64_physical_mode
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;;
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mov loc2=r8 // psr to restore mode
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mov loc3=gp // save kernel gp
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ld8 r14=[in0],8 // function address
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;;
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mov out0=in1
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mov out1=in2
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mov out2=in3
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mov out3=in4
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mov out4=in5
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ld8 gp=[in0] // function gp value
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;;
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mov b6=r14
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;;
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br.call.sptk.many rp=b6 // call EFI procedure
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mov gp=loc3 // restore kernel gp
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;;
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mov r14=loc2 // psr to restore mode
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br.call.sptk.many rp=ia64_change_mode
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;;
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mov rp=loc1
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mov ar.pfs=loc0
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;;
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br.ret.sptk.many rp
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END(ia64_call_efi_physical)
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/**************************************************************************/
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/*
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@ -63,13 +63,18 @@
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*
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* Arguments:
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* r14 psr for desired mode
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*
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* Modifies:
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* r15-r19 scratch
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* ar.bsp tranlated to new mode
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*/
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ENTRY(ia64_change_mode, 0)
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rsm psr.i | psr.ic
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mov ar.rsc=0 // turn off RSE
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mov r19=ar.rsc // save rsc while we change mode
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tbit.nz p6,p7=r14,17 // physical or virtual ?
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;;
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mov ar.rsc=0 // turn off RSE
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(p6) mov r15=7 // RR base for virtual addresses
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(p7) mov r15=0 // RR base for physical addresses
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flushrs // no dirty registers please
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@ -81,6 +86,7 @@ ENTRY(ia64_change_mode, 0)
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;;
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dep r16=r15,r16,61,3 // new address of ar.bsp
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dep r17=r15,r17,61,3 // new address of rp
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dep sp=r15,sp,61,3 // new address of sp
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;;
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mov ar.bspstore=r16
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mov rp=r17
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@ -98,7 +104,8 @@ ENTRY(ia64_change_mode, 0)
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;;
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rfi
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2: br.ret.sptk.few rp // now in new mode
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2: mov ar.rsc=r19 // restore ar.rsc
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br.ret.sptk.few rp // now in new mode
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END(ia64_change_mode)
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@ -107,12 +114,17 @@ END(ia64_change_mode)
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*
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* Return:
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* ret0 psr to restore
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*
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* Modifies:
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* r15-r18 scratch
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* ar.bsp tranlated to physical mode
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* psr.i cleared
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*/
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ENTRY(ia64_physical_mode, 0)
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mov r14=psr
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mov ret0=psr
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movl r15=(IA64_PSR_I|IA64_PSR_IT|IA64_PSR_DT|IA64_PSR_RT)
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movl r15=(IA64_PSR_I|IA64_PSR_IT|IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_DFL|IA64_PSR_DFH)
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movl r16=IA64_PSR_BN
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;;
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andcm r14=r14,r15 // clear various xT bits
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@ -124,6 +136,51 @@ ENTRY(ia64_physical_mode, 0)
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END(ia64_physical_mode)
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/*
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* ia64_call_efi_physical: call an EFI procedure in physical mode
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*
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* Arguments:
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* in0 Address of EFI procedure descriptor
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* in1-in5 Arguments to EFI procedure
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*
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* Return:
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* ret0-ret3 return values from EFI
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*
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*/
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ENTRY(ia64_call_efi_physical, 6)
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alloc loc0=ar.pfs,6,4,5,0
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;;
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mov loc1=rp
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;;
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br.call.sptk.many rp=ia64_physical_mode
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;;
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mov loc2=r8 // psr to restore mode
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mov loc3=gp // save kernel gp
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ld8 r14=[in0],8 // function address
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;;
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mov out0=in1
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mov out1=in2
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mov out2=in3
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mov out3=in4
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mov out4=in5
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ld8 gp=[in0] // function gp value
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;;
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mov b6=r14
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;;
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br.call.sptk.many rp=b6 // call EFI procedure
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mov gp=loc3 // restore kernel gp
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;;
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mov r14=loc2 // psr to restore mode
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br.call.sptk.many rp=ia64_change_mode
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;;
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mov rp=loc1
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mov ar.pfs=loc0
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;;
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br.ret.sptk.many rp
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END(ia64_call_efi_physical)
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/**************************************************************************/
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/*
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