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kernel-fxtec-pro1x/arch/ia64/kernel/mca_asm.S
Hidetoshi Seto 07a6a4ae82 [IA64] kexec: Make INIT safe while transition to 
kdump/kexec kernel

Summary:

  Asserting INIT on the beginning of kdump/kexec kernel will result
  in unexpected behavior because INIT handler for previous kernel is
  invoked on new kernel.

Description:

  In panic situation, we can receive INIT while kernel transition,
  i.e. from beginning of panic to bootstrap of kdump kernel.
  Since we initialize registers on leave from current kernel, no
  longer monarch/slave handlers of current kernel in virtual mode are
  called safely.  (In fact system goes hang as far as I confirmed)

How to Reproduce:

  Start kdump
    # echo c > /proc/sysrq-trigger
  Then assert INIT while kdump kernel is booting, before new INIT
  handler for kdump kernel is registered.

Expected(Desirable) result:

  kdump kernel boots without any problem, crashdump retrieved

Actual result:

  INIT handler for previous kernel is invoked on kdump kernel
  => panic, hang etc. (unexpected)

Proposed fix:

  We can unregister these init handlers from SAL before jumping into
  new kernel, however then the INIT will fallback to default behavior,
  result in warmboot by SAL (according to the SAL specification) and
  we cannot retrieve the crashdump.

  Therefore this patch introduces a NOP init handler and register it
  to SAL before leave from current kernel, to start kdump safely by
  preventing INITs from entering virtual mode and resulting in warmboot.

  On the other hand, in case of kexec that not for kdump, it also
  has same problem with INIT while kernel transition.
  This patch handles this case differently, because for kexec
  unregistering handlers will be preferred than registering NOP
  handler, since the situation "no handlers registered" is usual
  state for kernel's entry.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Haren Myneni <hbabu@us.ibm.com>
Cc: kexec@lists.infradead.org
Acked-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2009-09-14 16:18:02 -07:00

1122 lines
27 KiB
ArmAsm
Raw Blame History

/*
* File: mca_asm.S
* Purpose: assembly portion of the IA64 MCA handling
*
* Mods by cfleck to integrate into kernel build
*
* 2000-03-15 David Mosberger-Tang <davidm@hpl.hp.com>
* Added various stop bits to get a clean compile
*
* 2000-03-29 Chuck Fleckenstein <cfleck@co.intel.com>
* Added code to save INIT handoff state in pt_regs format,
* switch to temp kstack, switch modes, jump to C INIT handler
*
* 2002-01-04 J.Hall <jenna.s.hall@intel.com>
* Before entering virtual mode code:
* 1. Check for TLB CPU error
* 2. Restore current thread pointer to kr6
* 3. Move stack ptr 16 bytes to conform to C calling convention
*
* 2004-11-12 Russ Anderson <rja@sgi.com>
* Added per cpu MCA/INIT stack save areas.
*
* 2005-12-08 Keith Owens <kaos@sgi.com>
* Use per cpu MCA/INIT stacks for all data.
*/
#include <linux/threads.h>
#include <asm/asmmacro.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/mca_asm.h>
#include <asm/mca.h>
#include "entry.h"
#define GET_IA64_MCA_DATA(reg) \
GET_THIS_PADDR(reg, ia64_mca_data) \
;; \
ld8 reg=[reg]
.global ia64_do_tlb_purge
.global ia64_os_mca_dispatch
.global ia64_os_init_on_kdump
.global ia64_os_init_dispatch_monarch
.global ia64_os_init_dispatch_slave
.text
.align 16
//StartMain////////////////////////////////////////////////////////////////////
/*
* Just the TLB purge part is moved to a separate function
* so we can re-use the code for cpu hotplug code as well
* Caller should now setup b1, so we can branch once the
* tlb flush is complete.
*/
ia64_do_tlb_purge:
#define O(member) IA64_CPUINFO_##member##_OFFSET
GET_THIS_PADDR(r2, cpu_info) // load phys addr of cpu_info into r2
;;
addl r17=O(PTCE_STRIDE),r2
addl r2=O(PTCE_BASE),r2
;;
ld8 r18=[r2],(O(PTCE_COUNT)-O(PTCE_BASE));; // r18=ptce_base
ld4 r19=[r2],4 // r19=ptce_count[0]
ld4 r21=[r17],4 // r21=ptce_stride[0]
;;
ld4 r20=[r2] // r20=ptce_count[1]
ld4 r22=[r17] // r22=ptce_stride[1]
mov r24=0
;;
adds r20=-1,r20
;;
#undef O
2:
cmp.ltu p6,p7=r24,r19
(p7) br.cond.dpnt.few 4f
mov ar.lc=r20
3:
ptc.e r18
;;
add r18=r22,r18
br.cloop.sptk.few 3b
;;
add r18=r21,r18
add r24=1,r24
;;
br.sptk.few 2b
4:
srlz.i // srlz.i implies srlz.d
;;
// Now purge addresses formerly mapped by TR registers
// 1. Purge ITR&DTR for kernel.
movl r16=KERNEL_START
mov r18=KERNEL_TR_PAGE_SHIFT<<2
;;
ptr.i r16, r18
ptr.d r16, r18
;;
srlz.i
;;
srlz.d
;;
// 3. Purge ITR for PAL code.
GET_THIS_PADDR(r2, ia64_mca_pal_base)
;;
ld8 r16=[r2]
mov r18=IA64_GRANULE_SHIFT<<2
;;
ptr.i r16,r18
;;
srlz.i
;;
// 4. Purge DTR for stack.
mov r16=IA64_KR(CURRENT_STACK)
;;
shl r16=r16,IA64_GRANULE_SHIFT
movl r19=PAGE_OFFSET
;;
add r16=r19,r16
mov r18=IA64_GRANULE_SHIFT<<2
;;
ptr.d r16,r18
;;
srlz.i
;;
// Now branch away to caller.
br.sptk.many b1
;;
//EndMain//////////////////////////////////////////////////////////////////////
//StartMain////////////////////////////////////////////////////////////////////
ia64_os_mca_dispatch:
mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
LOAD_PHYSICAL(p0,r2,1f) // return address
mov r19=1 // All MCA events are treated as monarch (for now)
br.sptk ia64_state_save // save the state that is not in minstate
1:
GET_IA64_MCA_DATA(r2)
// Using MCA stack, struct ia64_sal_os_state, variable proc_state_param
;;
add r3=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET+SOS(PROC_STATE_PARAM), r2
;;
ld8 r18=[r3] // Get processor state parameter on existing PALE_CHECK.
;;
tbit.nz p6,p7=r18,60
(p7) br.spnt done_tlb_purge_and_reload
// The following code purges TC and TR entries. Then reload all TC entries.
// Purge percpu data TC entries.
begin_tlb_purge_and_reload:
movl r18=ia64_reload_tr;;
LOAD_PHYSICAL(p0,r18,ia64_reload_tr);;
mov b1=r18;;
br.sptk.many ia64_do_tlb_purge;;
ia64_reload_tr:
// Finally reload the TR registers.
// 1. Reload DTR/ITR registers for kernel.
mov r18=KERNEL_TR_PAGE_SHIFT<<2
movl r17=KERNEL_START
;;
mov cr.itir=r18
mov cr.ifa=r17
mov r16=IA64_TR_KERNEL
mov r19=ip
movl r18=PAGE_KERNEL
;;
dep r17=0,r19,0, KERNEL_TR_PAGE_SHIFT
;;
or r18=r17,r18
;;
itr.i itr[r16]=r18
;;
itr.d dtr[r16]=r18
;;
srlz.i
srlz.d
;;
// 3. Reload ITR for PAL code.
GET_THIS_PADDR(r2, ia64_mca_pal_pte)
;;
ld8 r18=[r2] // load PAL PTE
;;
GET_THIS_PADDR(r2, ia64_mca_pal_base)
;;
ld8 r16=[r2] // load PAL vaddr
mov r19=IA64_GRANULE_SHIFT<<2
;;
mov cr.itir=r19
mov cr.ifa=r16
mov r20=IA64_TR_PALCODE
;;
itr.i itr[r20]=r18
;;
srlz.i
;;
// 4. Reload DTR for stack.
mov r16=IA64_KR(CURRENT_STACK)
;;
shl r16=r16,IA64_GRANULE_SHIFT
movl r19=PAGE_OFFSET
;;
add r18=r19,r16
movl r20=PAGE_KERNEL
;;
add r16=r20,r16
mov r19=IA64_GRANULE_SHIFT<<2
;;
mov cr.itir=r19
mov cr.ifa=r18
mov r20=IA64_TR_CURRENT_STACK
;;
itr.d dtr[r20]=r16
GET_THIS_PADDR(r2, ia64_mca_tr_reload)
mov r18 = 1
;;
srlz.d
;;
st8 [r2] =r18
;;
done_tlb_purge_and_reload:
// switch to per cpu MCA stack
mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
LOAD_PHYSICAL(p0,r2,1f) // return address
br.sptk ia64_new_stack
1:
// everything saved, now we can set the kernel registers
mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
LOAD_PHYSICAL(p0,r2,1f) // return address
br.sptk ia64_set_kernel_registers
1:
// This must be done in physical mode
GET_IA64_MCA_DATA(r2)
;;
mov r7=r2
// Enter virtual mode from physical mode
VIRTUAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_begin, r4)
// This code returns to SAL via SOS r2, in general SAL has no unwind
// data. To get a clean termination when backtracing the C MCA/INIT
// handler, set a dummy return address of 0 in this routine. That
// requires that ia64_os_mca_virtual_begin be a global function.
ENTRY(ia64_os_mca_virtual_begin)
.prologue
.save rp,r0
.body
mov ar.rsc=3 // set eager mode for C handler
mov r2=r7 // see GET_IA64_MCA_DATA above
;;
// Call virtual mode handler
alloc r14=ar.pfs,0,0,3,0
;;
DATA_PA_TO_VA(r2,r7)
;;
add out0=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_PT_REGS_OFFSET, r2
add out1=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SWITCH_STACK_OFFSET, r2
add out2=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET, r2
br.call.sptk.many b0=ia64_mca_handler
// Revert back to physical mode before going back to SAL
PHYSICAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_end, r4)
ia64_os_mca_virtual_end:
END(ia64_os_mca_virtual_begin)
// switch back to previous stack
alloc r14=ar.pfs,0,0,0,0 // remove the MCA handler frame
mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
LOAD_PHYSICAL(p0,r2,1f) // return address
br.sptk ia64_old_stack
1:
mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
LOAD_PHYSICAL(p0,r2,1f) // return address
br.sptk ia64_state_restore // restore the SAL state
1:
mov b0=r12 // SAL_CHECK return address
br b0
//EndMain//////////////////////////////////////////////////////////////////////
//StartMain////////////////////////////////////////////////////////////////////
//
// NOP init handler for kdump. In panic situation, we may receive INIT
// while kernel transition. Since we initialize registers on leave from
// current kernel, no longer monarch/slave handlers of current kernel in
// virtual mode are called safely.
// We can unregister these init handlers from SAL, however then the INIT
// will result in warmboot by SAL and we cannot retrieve the crashdump.
// Therefore register this NOP function to SAL, to prevent entering virtual
// mode and resulting warmboot by SAL.
//
ia64_os_init_on_kdump:
mov r8=r0 // IA64_INIT_RESUME
mov r9=r10 // SAL_GP
mov r22=r17 // *minstate
;;
mov r10=r0 // return to same context
mov b0=r12 // SAL_CHECK return address
br b0
//
// SAL to OS entry point for INIT on all processors. This has been defined for
// registration purposes with SAL as a part of ia64_mca_init. Monarch and
// slave INIT have identical processing, except for the value of the
// sos->monarch flag in r19.
//
ia64_os_init_dispatch_monarch:
mov r19=1 // Bow, bow, ye lower middle classes!
br.sptk ia64_os_init_dispatch
ia64_os_init_dispatch_slave:
mov r19=0 // <igor>yeth, mathter</igor>
ia64_os_init_dispatch:
mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
LOAD_PHYSICAL(p0,r2,1f) // return address
br.sptk ia64_state_save // save the state that is not in minstate
1:
// switch to per cpu INIT stack
mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
LOAD_PHYSICAL(p0,r2,1f) // return address
br.sptk ia64_new_stack
1:
// everything saved, now we can set the kernel registers
mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
LOAD_PHYSICAL(p0,r2,1f) // return address
br.sptk ia64_set_kernel_registers
1:
// This must be done in physical mode
GET_IA64_MCA_DATA(r2)
;;
mov r7=r2
// Enter virtual mode from physical mode
VIRTUAL_MODE_ENTER(r2, r3, ia64_os_init_virtual_begin, r4)
// This code returns to SAL via SOS r2, in general SAL has no unwind
// data. To get a clean termination when backtracing the C MCA/INIT
// handler, set a dummy return address of 0 in this routine. That
// requires that ia64_os_init_virtual_begin be a global function.
ENTRY(ia64_os_init_virtual_begin)
.prologue
.save rp,r0
.body
mov ar.rsc=3 // set eager mode for C handler
mov r2=r7 // see GET_IA64_MCA_DATA above
;;
// Call virtual mode handler
alloc r14=ar.pfs,0,0,3,0
;;
DATA_PA_TO_VA(r2,r7)
;;
add out0=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_PT_REGS_OFFSET, r2
add out1=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_SWITCH_STACK_OFFSET, r2
add out2=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_SOS_OFFSET, r2
br.call.sptk.many b0=ia64_init_handler
// Revert back to physical mode before going back to SAL
PHYSICAL_MODE_ENTER(r2, r3, ia64_os_init_virtual_end, r4)
ia64_os_init_virtual_end:
END(ia64_os_init_virtual_begin)
mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
LOAD_PHYSICAL(p0,r2,1f) // return address
br.sptk ia64_state_restore // restore the SAL state
1:
// switch back to previous stack
alloc r14=ar.pfs,0,0,0,0 // remove the INIT handler frame
mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
LOAD_PHYSICAL(p0,r2,1f) // return address
br.sptk ia64_old_stack
1:
mov b0=r12 // SAL_CHECK return address
br b0
//EndMain//////////////////////////////////////////////////////////////////////
// common defines for the stubs
#define ms r4
#define regs r5
#define temp1 r2 /* careful, it overlaps with input registers */
#define temp2 r3 /* careful, it overlaps with input registers */
#define temp3 r7
#define temp4 r14
//++
// Name:
// ia64_state_save()
//
// Stub Description:
//
// Save the state that is not in minstate. This is sensitive to the layout of
// struct ia64_sal_os_state in mca.h.
//
// r2 contains the return address, r3 contains either
// IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
//
// The OS to SAL section of struct ia64_sal_os_state is set to a default
// value of cold boot (MCA) or warm boot (INIT) and return to the same
// context. ia64_sal_os_state is also used to hold some registers that
// need to be saved and restored across the stack switches.
//
// Most input registers to this stub come from PAL/SAL
// r1 os gp, physical
// r8 pal_proc entry point
// r9 sal_proc entry point
// r10 sal gp
// r11 MCA - rendevzous state, INIT - reason code
// r12 sal return address
// r17 pal min_state
// r18 processor state parameter
// r19 monarch flag, set by the caller of this routine
//
// In addition to the SAL to OS state, this routine saves all the
// registers that appear in struct pt_regs and struct switch_stack,
// excluding those that are already in the PAL minstate area. This
// results in a partial pt_regs and switch_stack, the C code copies the
// remaining registers from PAL minstate to pt_regs and switch_stack. The
// resulting structures contain all the state of the original process when
// MCA/INIT occurred.
//
//--
ia64_state_save:
add regs=MCA_SOS_OFFSET, r3
add ms=MCA_SOS_OFFSET+8, r3
mov b0=r2 // save return address
cmp.eq p1,p2=IA64_MCA_CPU_MCA_STACK_OFFSET, r3
;;
GET_IA64_MCA_DATA(temp2)
;;
add temp1=temp2, regs // struct ia64_sal_os_state on MCA or INIT stack
add temp2=temp2, ms // struct ia64_sal_os_state+8 on MCA or INIT stack
;;
mov regs=temp1 // save the start of sos
st8 [temp1]=r1,16 // os_gp
st8 [temp2]=r8,16 // pal_proc
;;
st8 [temp1]=r9,16 // sal_proc
st8 [temp2]=r11,16 // rv_rc
mov r11=cr.iipa
;;
st8 [temp1]=r18 // proc_state_param
st8 [temp2]=r19 // monarch
mov r6=IA64_KR(CURRENT)
add temp1=SOS(SAL_RA), regs
add temp2=SOS(SAL_GP), regs
;;
st8 [temp1]=r12,16 // sal_ra
st8 [temp2]=r10,16 // sal_gp
mov r12=cr.isr
;;
st8 [temp1]=r17,16 // pal_min_state
st8 [temp2]=r6,16 // prev_IA64_KR_CURRENT
mov r6=IA64_KR(CURRENT_STACK)
;;
st8 [temp1]=r6,16 // prev_IA64_KR_CURRENT_STACK
st8 [temp2]=r0,16 // prev_task, starts off as NULL
mov r6=cr.ifa
;;
st8 [temp1]=r12,16 // cr.isr
st8 [temp2]=r6,16 // cr.ifa
mov r12=cr.itir
;;
st8 [temp1]=r12,16 // cr.itir
st8 [temp2]=r11,16 // cr.iipa
mov r12=cr.iim
;;
st8 [temp1]=r12 // cr.iim
(p1) mov r12=IA64_MCA_COLD_BOOT
(p2) mov r12=IA64_INIT_WARM_BOOT
mov r6=cr.iha
add temp1=SOS(OS_STATUS), regs
;;
st8 [temp2]=r6 // cr.iha
add temp2=SOS(CONTEXT), regs
st8 [temp1]=r12 // os_status, default is cold boot
mov r6=IA64_MCA_SAME_CONTEXT
;;
st8 [temp2]=r6 // context, default is same context
// Save the pt_regs data that is not in minstate. The previous code
// left regs at sos.
add regs=MCA_PT_REGS_OFFSET-MCA_SOS_OFFSET, regs
;;
add temp1=PT(B6), regs
mov temp3=b6
mov temp4=b7
add temp2=PT(B7), regs
;;
st8 [temp1]=temp3,PT(AR_CSD)-PT(B6) // save b6
st8 [temp2]=temp4,PT(AR_SSD)-PT(B7) // save b7
mov temp3=ar.csd
mov temp4=ar.ssd
cover // must be last in group
;;
st8 [temp1]=temp3,PT(AR_UNAT)-PT(AR_CSD) // save ar.csd
st8 [temp2]=temp4,PT(AR_PFS)-PT(AR_SSD) // save ar.ssd
mov temp3=ar.unat
mov temp4=ar.pfs
;;
st8 [temp1]=temp3,PT(AR_RNAT)-PT(AR_UNAT) // save ar.unat
st8 [temp2]=temp4,PT(AR_BSPSTORE)-PT(AR_PFS) // save ar.pfs
mov temp3=ar.rnat
mov temp4=ar.bspstore
;;
st8 [temp1]=temp3,PT(LOADRS)-PT(AR_RNAT) // save ar.rnat
st8 [temp2]=temp4,PT(AR_FPSR)-PT(AR_BSPSTORE) // save ar.bspstore
mov temp3=ar.bsp
;;
sub temp3=temp3, temp4 // ar.bsp - ar.bspstore
mov temp4=ar.fpsr
;;
shl temp3=temp3,16 // compute ar.rsc to be used for "loadrs"
;;
st8 [temp1]=temp3,PT(AR_CCV)-PT(LOADRS) // save loadrs
st8 [temp2]=temp4,PT(F6)-PT(AR_FPSR) // save ar.fpsr
mov temp3=ar.ccv
;;
st8 [temp1]=temp3,PT(F7)-PT(AR_CCV) // save ar.ccv
stf.spill [temp2]=f6,PT(F8)-PT(F6)
;;
stf.spill [temp1]=f7,PT(F9)-PT(F7)
stf.spill [temp2]=f8,PT(F10)-PT(F8)
;;
stf.spill [temp1]=f9,PT(F11)-PT(F9)
stf.spill [temp2]=f10
;;
stf.spill [temp1]=f11
// Save the switch_stack data that is not in minstate nor pt_regs. The
// previous code left regs at pt_regs.
add regs=MCA_SWITCH_STACK_OFFSET-MCA_PT_REGS_OFFSET, regs
;;
add temp1=SW(F2), regs
add temp2=SW(F3), regs
;;
stf.spill [temp1]=f2,32
stf.spill [temp2]=f3,32
;;
stf.spill [temp1]=f4,32
stf.spill [temp2]=f5,32
;;
stf.spill [temp1]=f12,32
stf.spill [temp2]=f13,32
;;
stf.spill [temp1]=f14,32
stf.spill [temp2]=f15,32
;;
stf.spill [temp1]=f16,32
stf.spill [temp2]=f17,32
;;
stf.spill [temp1]=f18,32
stf.spill [temp2]=f19,32
;;
stf.spill [temp1]=f20,32
stf.spill [temp2]=f21,32
;;
stf.spill [temp1]=f22,32
stf.spill [temp2]=f23,32
;;
stf.spill [temp1]=f24,32
stf.spill [temp2]=f25,32
;;
stf.spill [temp1]=f26,32
stf.spill [temp2]=f27,32
;;
stf.spill [temp1]=f28,32
stf.spill [temp2]=f29,32
;;
stf.spill [temp1]=f30,SW(B2)-SW(F30)
stf.spill [temp2]=f31,SW(B3)-SW(F31)
mov temp3=b2
mov temp4=b3
;;
st8 [temp1]=temp3,16 // save b2
st8 [temp2]=temp4,16 // save b3
mov temp3=b4
mov temp4=b5
;;
st8 [temp1]=temp3,SW(AR_LC)-SW(B4) // save b4
st8 [temp2]=temp4 // save b5
mov temp3=ar.lc
;;
st8 [temp1]=temp3 // save ar.lc
// FIXME: Some proms are incorrectly accessing the minstate area as
// cached data. The C code uses region 6, uncached virtual. Ensure
// that there is no cache data lying around for the first 1K of the
// minstate area.
// Remove this code in September 2006, that gives platforms a year to
// fix their proms and get their customers updated.
add r1=32*1,r17
add r2=32*2,r17
add r3=32*3,r17
add r4=32*4,r17
add r5=32*5,r17
add r6=32*6,r17
add r7=32*7,r17
;;
fc r17
fc r1
fc r2
fc r3
fc r4
fc r5
fc r6
fc r7
add r17=32*8,r17
add r1=32*8,r1
add r2=32*8,r2
add r3=32*8,r3
add r4=32*8,r4
add r5=32*8,r5
add r6=32*8,r6
add r7=32*8,r7
;;
fc r17
fc r1
fc r2
fc r3
fc r4
fc r5
fc r6
fc r7
add r17=32*8,r17
add r1=32*8,r1
add r2=32*8,r2
add r3=32*8,r3
add r4=32*8,r4
add r5=32*8,r5
add r6=32*8,r6
add r7=32*8,r7
;;
fc r17
fc r1
fc r2
fc r3
fc r4
fc r5
fc r6
fc r7
add r17=32*8,r17
add r1=32*8,r1
add r2=32*8,r2
add r3=32*8,r3
add r4=32*8,r4
add r5=32*8,r5
add r6=32*8,r6
add r7=32*8,r7
;;
fc r17
fc r1
fc r2
fc r3
fc r4
fc r5
fc r6
fc r7
br.sptk b0
//EndStub//////////////////////////////////////////////////////////////////////
//++
// Name:
// ia64_state_restore()
//
// Stub Description:
//
// Restore the SAL/OS state. This is sensitive to the layout of struct
// ia64_sal_os_state in mca.h.
//
// r2 contains the return address, r3 contains either
// IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
//
// In addition to the SAL to OS state, this routine restores all the
// registers that appear in struct pt_regs and struct switch_stack,
// excluding those in the PAL minstate area.
//
//--
ia64_state_restore:
// Restore the switch_stack data that is not in minstate nor pt_regs.
add regs=MCA_SWITCH_STACK_OFFSET, r3
mov b0=r2 // save return address
;;
GET_IA64_MCA_DATA(temp2)
;;
add regs=temp2, regs
;;
add temp1=SW(F2), regs
add temp2=SW(F3), regs
;;
ldf.fill f2=[temp1],32
ldf.fill f3=[temp2],32
;;
ldf.fill f4=[temp1],32
ldf.fill f5=[temp2],32
;;
ldf.fill f12=[temp1],32
ldf.fill f13=[temp2],32
;;
ldf.fill f14=[temp1],32
ldf.fill f15=[temp2],32
;;
ldf.fill f16=[temp1],32
ldf.fill f17=[temp2],32
;;
ldf.fill f18=[temp1],32
ldf.fill f19=[temp2],32
;;
ldf.fill f20=[temp1],32
ldf.fill f21=[temp2],32
;;
ldf.fill f22=[temp1],32
ldf.fill f23=[temp2],32
;;
ldf.fill f24=[temp1],32
ldf.fill f25=[temp2],32
;;
ldf.fill f26=[temp1],32
ldf.fill f27=[temp2],32
;;
ldf.fill f28=[temp1],32
ldf.fill f29=[temp2],32
;;
ldf.fill f30=[temp1],SW(B2)-SW(F30)
ldf.fill f31=[temp2],SW(B3)-SW(F31)
;;
ld8 temp3=[temp1],16 // restore b2
ld8 temp4=[temp2],16 // restore b3
;;
mov b2=temp3
mov b3=temp4
ld8 temp3=[temp1],SW(AR_LC)-SW(B4) // restore b4
ld8 temp4=[temp2] // restore b5
;;
mov b4=temp3
mov b5=temp4
ld8 temp3=[temp1] // restore ar.lc
;;
mov ar.lc=temp3
// Restore the pt_regs data that is not in minstate. The previous code
// left regs at switch_stack.
add regs=MCA_PT_REGS_OFFSET-MCA_SWITCH_STACK_OFFSET, regs
;;
add temp1=PT(B6), regs
add temp2=PT(B7), regs
;;
ld8 temp3=[temp1],PT(AR_CSD)-PT(B6) // restore b6
ld8 temp4=[temp2],PT(AR_SSD)-PT(B7) // restore b7
;;
mov b6=temp3
mov b7=temp4
ld8 temp3=[temp1],PT(AR_UNAT)-PT(AR_CSD) // restore ar.csd
ld8 temp4=[temp2],PT(AR_PFS)-PT(AR_SSD) // restore ar.ssd
;;
mov ar.csd=temp3
mov ar.ssd=temp4
ld8 temp3=[temp1] // restore ar.unat
add temp1=PT(AR_CCV)-PT(AR_UNAT), temp1
ld8 temp4=[temp2],PT(AR_FPSR)-PT(AR_PFS) // restore ar.pfs
;;
mov ar.unat=temp3
mov ar.pfs=temp4
// ar.rnat, ar.bspstore, loadrs are restore in ia64_old_stack.
ld8 temp3=[temp1],PT(F6)-PT(AR_CCV) // restore ar.ccv
ld8 temp4=[temp2],PT(F7)-PT(AR_FPSR) // restore ar.fpsr
;;
mov ar.ccv=temp3
mov ar.fpsr=temp4
ldf.fill f6=[temp1],PT(F8)-PT(F6)
ldf.fill f7=[temp2],PT(F9)-PT(F7)
;;
ldf.fill f8=[temp1],PT(F10)-PT(F8)
ldf.fill f9=[temp2],PT(F11)-PT(F9)
;;
ldf.fill f10=[temp1]
ldf.fill f11=[temp2]
// Restore the SAL to OS state. The previous code left regs at pt_regs.
add regs=MCA_SOS_OFFSET-MCA_PT_REGS_OFFSET, regs
;;
add temp1=SOS(SAL_RA), regs
add temp2=SOS(SAL_GP), regs
;;
ld8 r12=[temp1],16 // sal_ra
ld8 r9=[temp2],16 // sal_gp
;;
ld8 r22=[temp1],16 // pal_min_state, virtual
ld8 r13=[temp2],16 // prev_IA64_KR_CURRENT
;;
ld8 r16=[temp1],16 // prev_IA64_KR_CURRENT_STACK
ld8 r20=[temp2],16 // prev_task
;;
ld8 temp3=[temp1],16 // cr.isr
ld8 temp4=[temp2],16 // cr.ifa
;;
mov cr.isr=temp3
mov cr.ifa=temp4
ld8 temp3=[temp1],16 // cr.itir
ld8 temp4=[temp2],16 // cr.iipa
;;
mov cr.itir=temp3
mov cr.iipa=temp4
ld8 temp3=[temp1] // cr.iim
ld8 temp4=[temp2] // cr.iha
add temp1=SOS(OS_STATUS), regs
add temp2=SOS(CONTEXT), regs
;;
mov cr.iim=temp3
mov cr.iha=temp4
dep r22=0,r22,62,1 // pal_min_state, physical, uncached
mov IA64_KR(CURRENT)=r13
ld8 r8=[temp1] // os_status
ld8 r10=[temp2] // context
/* Wire IA64_TR_CURRENT_STACK to the stack that we are resuming to. To
* avoid any dependencies on the algorithm in ia64_switch_to(), just
* purge any existing CURRENT_STACK mapping and insert the new one.
*
* r16 contains prev_IA64_KR_CURRENT_STACK, r13 contains
* prev_IA64_KR_CURRENT, these values may have been changed by the C
* code. Do not use r8, r9, r10, r22, they contain values ready for
* the return to SAL.
*/
mov r15=IA64_KR(CURRENT_STACK) // physical granule mapped by IA64_TR_CURRENT_STACK
;;
shl r15=r15,IA64_GRANULE_SHIFT
;;
dep r15=-1,r15,61,3 // virtual granule
mov r18=IA64_GRANULE_SHIFT<<2 // for cr.itir.ps
;;
ptr.d r15,r18
;;
srlz.d
extr.u r19=r13,61,3 // r13 = prev_IA64_KR_CURRENT
shl r20=r16,IA64_GRANULE_SHIFT // r16 = prev_IA64_KR_CURRENT_STACK
movl r21=PAGE_KERNEL // page properties
;;
mov IA64_KR(CURRENT_STACK)=r16
cmp.ne p6,p0=RGN_KERNEL,r19 // new stack is in the kernel region?
or r21=r20,r21 // construct PA | page properties
(p6) br.spnt 1f // the dreaded cpu 0 idle task in region 5:(
;;
mov cr.itir=r18
mov cr.ifa=r13
mov r20=IA64_TR_CURRENT_STACK
;;
itr.d dtr[r20]=r21
;;
srlz.d
1:
br.sptk b0
//EndStub//////////////////////////////////////////////////////////////////////
//++
// Name:
// ia64_new_stack()
//
// Stub Description:
//
// Switch to the MCA/INIT stack.
//
// r2 contains the return address, r3 contains either
// IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
//
// On entry RBS is still on the original stack, this routine switches RBS
// to use the MCA/INIT stack.
//
// On entry, sos->pal_min_state is physical, on exit it is virtual.
//
//--
ia64_new_stack:
add regs=MCA_PT_REGS_OFFSET, r3
add temp2=MCA_SOS_OFFSET+SOS(PAL_MIN_STATE), r3
mov b0=r2 // save return address
GET_IA64_MCA_DATA(temp1)
invala
;;
add temp2=temp2, temp1 // struct ia64_sal_os_state.pal_min_state on MCA or INIT stack
add regs=regs, temp1 // struct pt_regs on MCA or INIT stack
;;
// Address of minstate area provided by PAL is physical, uncacheable.
// Convert to Linux virtual address in region 6 for C code.
ld8 ms=[temp2] // pal_min_state, physical
;;
dep temp1=-1,ms,62,2 // set region 6
mov temp3=IA64_RBS_OFFSET-MCA_PT_REGS_OFFSET
;;
st8 [temp2]=temp1 // pal_min_state, virtual
add temp4=temp3, regs // start of bspstore on new stack
;;
mov ar.bspstore=temp4 // switch RBS to MCA/INIT stack
;;
flushrs // must be first in group
br.sptk b0
//EndStub//////////////////////////////////////////////////////////////////////
//++
// Name:
// ia64_old_stack()
//
// Stub Description:
//
// Switch to the old stack.
//
// r2 contains the return address, r3 contains either
// IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
//
// On entry, pal_min_state is virtual, on exit it is physical.
//
// On entry RBS is on the MCA/INIT stack, this routine switches RBS
// back to the previous stack.
//
// The psr is set to all zeroes. SAL return requires either all zeroes or
// just psr.mc set. Leaving psr.mc off allows INIT to be issued if this
// code does not perform correctly.
//
// The dirty registers at the time of the event were flushed to the
// MCA/INIT stack in ia64_pt_regs_save(). Restore the dirty registers
// before reverting to the previous bspstore.
//--
ia64_old_stack:
add regs=MCA_PT_REGS_OFFSET, r3
mov b0=r2 // save return address
GET_IA64_MCA_DATA(temp2)
LOAD_PHYSICAL(p0,temp1,1f)
;;
mov cr.ipsr=r0
mov cr.ifs=r0
mov cr.iip=temp1
;;
invala
rfi
1:
add regs=regs, temp2 // struct pt_regs on MCA or INIT stack
;;
add temp1=PT(LOADRS), regs
;;
ld8 temp2=[temp1],PT(AR_BSPSTORE)-PT(LOADRS) // restore loadrs
;;
ld8 temp3=[temp1],PT(AR_RNAT)-PT(AR_BSPSTORE) // restore ar.bspstore
mov ar.rsc=temp2
;;
loadrs
ld8 temp4=[temp1] // restore ar.rnat
;;
mov ar.bspstore=temp3 // back to old stack
;;
mov ar.rnat=temp4
;;
br.sptk b0
//EndStub//////////////////////////////////////////////////////////////////////
//++
// Name:
// ia64_set_kernel_registers()
//
// Stub Description:
//
// Set the registers that are required by the C code in order to run on an
// MCA/INIT stack.
//
// r2 contains the return address, r3 contains either
// IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
//
//--
ia64_set_kernel_registers:
add temp3=MCA_SP_OFFSET, r3
mov b0=r2 // save return address
GET_IA64_MCA_DATA(temp1)
;;
add r12=temp1, temp3 // kernel stack pointer on MCA/INIT stack
add r13=temp1, r3 // set current to start of MCA/INIT stack
add r20=temp1, r3 // physical start of MCA/INIT stack
;;
DATA_PA_TO_VA(r12,temp2)
DATA_PA_TO_VA(r13,temp3)
;;
mov IA64_KR(CURRENT)=r13
/* Wire IA64_TR_CURRENT_STACK to the MCA/INIT handler stack. To avoid
* any dependencies on the algorithm in ia64_switch_to(), just purge
* any existing CURRENT_STACK mapping and insert the new one.
*/
mov r16=IA64_KR(CURRENT_STACK) // physical granule mapped by IA64_TR_CURRENT_STACK
;;
shl r16=r16,IA64_GRANULE_SHIFT
;;
dep r16=-1,r16,61,3 // virtual granule
mov r18=IA64_GRANULE_SHIFT<<2 // for cr.itir.ps
;;
ptr.d r16,r18
;;
srlz.d
shr.u r16=r20,IA64_GRANULE_SHIFT // r20 = physical start of MCA/INIT stack
movl r21=PAGE_KERNEL // page properties
;;
mov IA64_KR(CURRENT_STACK)=r16
or r21=r20,r21 // construct PA | page properties
;;
mov cr.itir=r18
mov cr.ifa=r13
mov r20=IA64_TR_CURRENT_STACK
movl r17=FPSR_DEFAULT
;;
mov.m ar.fpsr=r17 // set ar.fpsr to kernel default value
;;
itr.d dtr[r20]=r21
;;
srlz.d
br.sptk b0
//EndStub//////////////////////////////////////////////////////////////////////
#undef ms
#undef regs
#undef temp1
#undef temp2
#undef temp3
#undef temp4
// Support function for mca.c, it is here to avoid using inline asm. Given the
// address of an rnat slot, if that address is below the current ar.bspstore
// then return the contents of that slot, otherwise return the contents of
// ar.rnat.
GLOBAL_ENTRY(ia64_get_rnat)
alloc r14=ar.pfs,1,0,0,0
mov ar.rsc=0
;;
mov r14=ar.bspstore
;;
cmp.lt p6,p7=in0,r14
;;
(p6) ld8 r8=[in0]
(p7) mov r8=ar.rnat
mov ar.rsc=3
br.ret.sptk.many rp
END(ia64_get_rnat)
// void ia64_set_psr_mc(void)
//
// Set psr.mc bit to mask MCA/INIT.
GLOBAL_ENTRY(ia64_set_psr_mc)
rsm psr.i | psr.ic // disable interrupts
;;
srlz.d
;;
mov r14 = psr // get psr{36:35,31:0}
movl r15 = 1f
;;
dep r14 = -1, r14, PSR_MC, 1 // set psr.mc
;;
dep r14 = -1, r14, PSR_IC, 1 // set psr.ic
;;
dep r14 = -1, r14, PSR_BN, 1 // keep bank1 in use
;;
mov cr.ipsr = r14
mov cr.ifs = r0
mov cr.iip = r15
;;
rfi
1:
br.ret.sptk.many rp
END(ia64_set_psr_mc)
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