/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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 <linux/pgtable.h>

#include <asm/asmmacro.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, ia64_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)