6 files changed, 183 insertions, 44 deletions

diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index 8b2524293eb4..cea91f17d44b 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -36,7 +36,7 @@ obj-$(CONFIG_PCI_MSI)		+= msi_ia64.o
 mca_recovery-y                  += mca_drv.o mca_drv_asm.o
 obj-$(CONFIG_IA64_MC_ERR_INJECT)+= err_inject.o
 
-obj-$(CONFIG_PARAVIRT)          += paravirt.o
+obj-$(CONFIG_PARAVIRT)          += paravirt.o paravirtentry.o
 
 obj-$(CONFIG_IA64_ESI)          += esi.o
 ifneq ($(CONFIG_IA64_ESI),)
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index ca2bb95726de..56ab156c48ae 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -23,6 +23,11 @@
  * 11/07/2000
  */
 /*
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *                    pv_ops.
+ */
+/*
  * Global (preserved) predicate usage on syscall entry/exit path:
  *
  *      pKStk:          See entry.h.
@@ -45,6 +50,7 @@
 
 #include "minstate.h"
 
+#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
         /*
          * execve() is special because in case of success, we need to
          * setup a null register window frame.
@@ -173,6 +179,7 @@ GLOBAL_ENTRY(sys_clone)
         mov rp=loc0
         br.ret.sptk.many rp
 END(sys_clone)
+#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
 
 /*
  * prev_task <- ia64_switch_to(struct task_struct *next)
@@ -180,7 +187,7 @@ END(sys_clone)
  *      called.  The code starting at .map relies on this.  The rest of the code
  *      doesn't care about the interrupt masking status.
  */
-GLOBAL_ENTRY(ia64_switch_to)
+GLOBAL_ENTRY(__paravirt_switch_to)
         .prologue
         alloc r16=ar.pfs,1,0,0,0
         DO_SAVE_SWITCH_STACK
@@ -204,7 +211,7 @@ GLOBAL_ENTRY(ia64_switch_to)
         ;;
 .done:
         ld8 sp=[r21]                    // load kernel stack pointer of new task
-        mov IA64_KR(CURRENT)=in0        // update "current" application register
+        MOV_TO_KR(CURRENT, in0, r8, r9)         // update "current" application register
         mov r8=r13                      // return pointer to previously running task
         mov r13=in0                     // set "current" pointer
         ;;
@@ -216,26 +223,25 @@ GLOBAL_ENTRY(ia64_switch_to)
         br.ret.sptk.many rp             // boogie on out in new context
 
 .map:
-        rsm psr.ic                      // interrupts (psr.i) are already disabled here
+        RSM_PSR_IC(r25)                 // interrupts (psr.i) are already disabled here
         movl r25=PAGE_KERNEL
         ;;
         srlz.d
         or r23=r25,r20                  // construct PA | page properties
         mov r25=IA64_GRANULE_SHIFT<<2
         ;;
-        mov cr.itir=r25
-        mov cr.ifa=in0                  // VA of next task...
+        MOV_TO_ITIR(p0, r25, r8)
+        MOV_TO_IFA(in0, r8)             // VA of next task...
         ;;
         mov r25=IA64_TR_CURRENT_STACK
-        mov IA64_KR(CURRENT_STACK)=r26  // remember last page we mapped...
+        MOV_TO_KR(CURRENT_STACK, r26, r8, r9)   // remember last page we mapped...
         ;;
         itr.d dtr[r25]=r23              // wire in new mapping...
-        ssm psr.ic                      // reenable the psr.ic bit
-        ;;
-        srlz.d
+        SSM_PSR_IC_AND_SRLZ_D(r8, r9)   // reenable the psr.ic bit
         br.cond.sptk .done
-END(ia64_switch_to)
+END(__paravirt_switch_to)
 
+#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
 /*
  * Note that interrupts are enabled during save_switch_stack and load_switch_stack.  This
  * means that we may get an interrupt with "sp" pointing to the new kernel stack while
@@ -375,7 +381,7 @@ END(save_switch_stack)
  *      - b7 holds address to return to
  *      - must not touch r8-r11
  */
-ENTRY(load_switch_stack)
+GLOBAL_ENTRY(load_switch_stack)
         .prologue
         .altrp b7
 
@@ -571,7 +577,7 @@ GLOBAL_ENTRY(ia64_trace_syscall)
 .ret3:
 (pUStk) cmp.eq.unc p6,p0=r0,r0                  // p6 <- pUStk
 (pUStk) rsm psr.i                               // disable interrupts
-        br.cond.sptk .work_pending_syscall_end
+        br.cond.sptk ia64_work_pending_syscall_end
 
 strace_error:
         ld8 r3=[r2]                             // load pt_regs.r8
@@ -636,8 +642,17 @@ GLOBAL_ENTRY(ia64_ret_from_syscall)
         adds r2=PT(R8)+16,sp                    // r2 = &pt_regs.r8
         mov r10=r0                              // clear error indication in r10
 (p7)    br.cond.spnt handle_syscall_error       // handle potential syscall failure
+#ifdef CONFIG_PARAVIRT
+        ;;
+        br.cond.sptk.few ia64_leave_syscall
+        ;;
+#endif /* CONFIG_PARAVIRT */
 END(ia64_ret_from_syscall)
+#ifndef CONFIG_PARAVIRT
         // fall through
+#endif
+#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
+
 /*
  * ia64_leave_syscall(): Same as ia64_leave_kernel, except that it doesn't
  *      need to switch to bank 0 and doesn't restore the scratch registers.
@@ -682,7 +697,7 @@ END(ia64_ret_from_syscall)
  *            ar.csd: cleared
  *            ar.ssd: cleared
  */
-ENTRY(ia64_leave_syscall)
+GLOBAL_ENTRY(__paravirt_leave_syscall)
         PT_REGS_UNWIND_INFO(0)
         /*
          * work.need_resched etc. mustn't get changed by this CPU before it returns to
@@ -692,11 +707,11 @@ ENTRY(ia64_leave_syscall)
          * extra work.  We always check for extra work when returning to user-level.
          * With CONFIG_PREEMPT, we also check for extra work when the preempt_count
          * is 0.  After extra work processing has been completed, execution
-         * resumes at .work_processed_syscall with p6 set to 1 if the extra-work-check
+         * resumes at ia64_work_processed_syscall with p6 set to 1 if the extra-work-check
          * needs to be redone.
          */
 #ifdef CONFIG_PREEMPT
-        rsm psr.i                               // disable interrupts
+        RSM_PSR_I(p0, r2, r18)                  // disable interrupts
         cmp.eq pLvSys,p0=r0,r0                  // pLvSys=1: leave from syscall
 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
         ;;
@@ -706,11 +721,12 @@ ENTRY(ia64_leave_syscall)
         ;;
         cmp.eq p6,p0=r21,r0             // p6 <- pUStk || (preempt_count == 0)
 #else /* !CONFIG_PREEMPT */
-(pUStk) rsm psr.i
+        RSM_PSR_I(pUStk, r2, r18)
         cmp.eq pLvSys,p0=r0,r0          // pLvSys=1: leave from syscall
 (pUStk) cmp.eq.unc p6,p0=r0,r0          // p6 <- pUStk
 #endif
-.work_processed_syscall:
+.global __paravirt_work_processed_syscall;
+__paravirt_work_processed_syscall:
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
         adds r2=PT(LOADRS)+16,r12
 (pUStk) mov.m r22=ar.itc                        // fetch time at leave
@@ -744,7 +760,7 @@ ENTRY(ia64_leave_syscall)
 (pNonSys) break 0               //      bug check: we shouldn't be here if pNonSys is TRUE!
         ;;
         invala                  // M0|1 invalidate ALAT
-        rsm psr.i | psr.ic      // M2   turn off interrupts and interruption collection
+        RSM_PSR_I_IC(r28, r29, r30)     // M2   turn off interrupts and interruption collection
         cmp.eq p9,p0=r0,r0      // A    set p9 to indicate that we should restore cr.ifs
 
         ld8 r29=[r2],16         // M0|1 load cr.ipsr
@@ -765,7 +781,7 @@ ENTRY(ia64_leave_syscall)
         ;;
 #endif
         ld8 r26=[r2],PT(B0)-PT(AR_PFS)  // M0|1 load ar.pfs
-(pKStk) mov r22=psr                     // M2   read PSR now that interrupts are disabled
+        MOV_FROM_PSR(pKStk, r22, r21)   // M2   read PSR now that interrupts are disabled
         nop 0
         ;;
         ld8 r21=[r2],PT(AR_RNAT)-PT(B0) // M0|1 load b0
@@ -798,7 +814,7 @@ ENTRY(ia64_leave_syscall)
 
         srlz.d                          // M0   ensure interruption collection is off (for cover)
         shr.u r18=r19,16                // I0|1 get byte size of existing "dirty" partition
-        cover                           // B    add current frame into dirty partition & set cr.ifs
+        COVER                           // B    add current frame into dirty partition & set cr.ifs
         ;;
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
         mov r19=ar.bsp                  // M2   get new backing store pointer
@@ -823,8 +839,9 @@ ENTRY(ia64_leave_syscall)
         mov.m ar.ssd=r0                 // M2   clear ar.ssd
         mov f11=f0                      // F    clear f11
         br.cond.sptk.many rbs_switch    // B
-END(ia64_leave_syscall)
+END(__paravirt_leave_syscall)
 
+#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
 #ifdef CONFIG_IA32_SUPPORT
 GLOBAL_ENTRY(ia64_ret_from_ia32_execve)
         PT_REGS_UNWIND_INFO(0)
@@ -835,10 +852,20 @@ GLOBAL_ENTRY(ia64_ret_from_ia32_execve)
         st8.spill [r2]=r8       // store return value in slot for r8 and set unat bit
         .mem.offset 8,0
         st8.spill [r3]=r0       // clear error indication in slot for r10 and set unat bit
+#ifdef CONFIG_PARAVIRT
+        ;;
+        // don't fall through, ia64_leave_kernel may be #define'd
+        br.cond.sptk.few ia64_leave_kernel
+        ;;
+#endif /* CONFIG_PARAVIRT */
 END(ia64_ret_from_ia32_execve)
+#ifndef CONFIG_PARAVIRT
         // fall through
+#endif
 #endif /* CONFIG_IA32_SUPPORT */
-GLOBAL_ENTRY(ia64_leave_kernel)
+#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
+
+GLOBAL_ENTRY(__paravirt_leave_kernel)
         PT_REGS_UNWIND_INFO(0)
         /*
          * work.need_resched etc. mustn't get changed by this CPU before it returns to
@@ -852,7 +879,7 @@ GLOBAL_ENTRY(ia64_leave_kernel)
          * needs to be redone.
          */
 #ifdef CONFIG_PREEMPT
-        rsm psr.i                               // disable interrupts
+        RSM_PSR_I(p0, r17, r31)                 // disable interrupts
         cmp.eq p0,pLvSys=r0,r0                  // pLvSys=0: leave from kernel
 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
         ;;
@@ -862,7 +889,7 @@ GLOBAL_ENTRY(ia64_leave_kernel)
         ;;
         cmp.eq p6,p0=r21,r0             // p6 <- pUStk || (preempt_count == 0)
 #else
-(pUStk) rsm psr.i
+        RSM_PSR_I(pUStk, r17, r31)
         cmp.eq p0,pLvSys=r0,r0          // pLvSys=0: leave from kernel
 (pUStk) cmp.eq.unc p6,p0=r0,r0          // p6 <- pUStk
 #endif
@@ -910,7 +937,7 @@ GLOBAL_ENTRY(ia64_leave_kernel)
         mov ar.csd=r30
         mov ar.ssd=r31
         ;;
-        rsm psr.i | psr.ic      // initiate turning off of interrupt and interruption collection
+        RSM_PSR_I_IC(r23, r22, r25)     // initiate turning off of interrupt and interruption collection
         invala                  // invalidate ALAT
         ;;
         ld8.fill r22=[r2],24
@@ -942,7 +969,7 @@ GLOBAL_ENTRY(ia64_leave_kernel)
         mov ar.ccv=r15
         ;;
         ldf.fill f11=[r2]
-        bsw.0                   // switch back to bank 0 (no stop bit required beforehand...)
+        BSW_0(r2, r3, r15)      // switch back to bank 0 (no stop bit required beforehand...)
         ;;
 (pUStk) mov r18=IA64_KR(CURRENT)// M2 (12 cycle read latency)
         adds r16=PT(CR_IPSR)+16,r12
@@ -950,12 +977,12 @@ GLOBAL_ENTRY(ia64_leave_kernel)
 
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
         .pred.rel.mutex pUStk,pKStk
-(pKStk) mov r22=psr             // M2 read PSR now that interrupts are disabled
+        MOV_FROM_PSR(pKStk, r22, r29)   // M2 read PSR now that interrupts are disabled
 (pUStk) mov.m r22=ar.itc        // M  fetch time at leave
         nop.i 0
         ;;
 #else
-(pKStk) mov r22=psr             // M2 read PSR now that interrupts are disabled
+        MOV_FROM_PSR(pKStk, r22, r29)   // M2 read PSR now that interrupts are disabled
         nop.i 0
         nop.i 0
         ;;
@@ -1027,7 +1054,7 @@ GLOBAL_ENTRY(ia64_leave_kernel)
          * NOTE: alloc, loadrs, and cover can't be predicated.
          */
 (pNonSys) br.cond.dpnt dont_preserve_current_frame
-        cover                           // add current frame into dirty partition and set cr.ifs
+        COVER                           // add current frame into dirty partition and set cr.ifs
         ;;
         mov r19=ar.bsp                  // get new backing store pointer
 rbs_switch:
@@ -1130,16 +1157,16 @@ skip_rbs_switch:
 (pKStk) dep r29=r22,r29,21,1    // I0 update ipsr.pp with psr.pp
 (pLvSys)mov r16=r0              // A  clear r16 for leave_syscall, no-op otherwise
         ;;
-        mov cr.ipsr=r29         // M2
+        MOV_TO_IPSR(p0, r29, r25)       // M2
         mov ar.pfs=r26          // I0
 (pLvSys)mov r17=r0              // A  clear r17 for leave_syscall, no-op otherwise
 
-(p9)    mov cr.ifs=r30          // M2
+        MOV_TO_IFS(p9, r30, r25)// M2
         mov b0=r21              // I0
 (pLvSys)mov r18=r0              // A  clear r18 for leave_syscall, no-op otherwise
 
         mov ar.fpsr=r20         // M2
-        mov cr.iip=r28          // M2
+        MOV_TO_IIP(r28, r25)    // M2
         nop 0
         ;;
 (pUStk) mov ar.rnat=r24         // M2 must happen with RSE in lazy mode
@@ -1148,7 +1175,7 @@ skip_rbs_switch:
 
         mov ar.rsc=r27          // M2
         mov pr=r31,-1           // I0
-        rfi                     // B
+        RFI                     // B
 
         /*
          * On entry:
@@ -1174,35 +1201,36 @@ skip_rbs_switch:
         ;;
 (pKStk) st4 [r20]=r21
 #endif
-        ssm psr.i               // enable interrupts
+        SSM_PSR_I(p0, p6, r2)   // enable interrupts
         br.call.spnt.many rp=schedule
 .ret9:  cmp.eq p6,p0=r0,r0      // p6 <- 1 (re-check)
-        rsm psr.i               // disable interrupts
+        RSM_PSR_I(p0, r2, r20)  // disable interrupts
         ;;
 #ifdef CONFIG_PREEMPT
 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
         ;;
 (pKStk) st4 [r20]=r0            // preempt_count() <- 0
 #endif
-(pLvSys)br.cond.sptk.few  .work_pending_syscall_end
+(pLvSys)br.cond.sptk.few  __paravirt_pending_syscall_end
         br.cond.sptk.many .work_processed_kernel
 
 .notify:
 (pUStk) br.call.spnt.many rp=notify_resume_user
 .ret10: cmp.ne p6,p0=r0,r0      // p6 <- 0 (don't re-check)
-(pLvSys)br.cond.sptk.few  .work_pending_syscall_end
+(pLvSys)br.cond.sptk.few  __paravirt_pending_syscall_end
         br.cond.sptk.many .work_processed_kernel
 
-.work_pending_syscall_end:
+.global __paravirt_pending_syscall_end;
+__paravirt_pending_syscall_end:
         adds r2=PT(R8)+16,r12
         adds r3=PT(R10)+16,r12
         ;;
         ld8 r8=[r2]
         ld8 r10=[r3]
-        br.cond.sptk.many .work_processed_syscall
-
-END(ia64_leave_kernel)
+        br.cond.sptk.many __paravirt_work_processed_syscall_target
+END(__paravirt_leave_kernel)
 
+#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
 ENTRY(handle_syscall_error)
         /*
          * Some system calls (e.g., ptrace, mmap) can return arbitrary values which could
@@ -1244,7 +1272,7 @@ END(ia64_invoke_schedule_tail)
          * We declare 8 input registers so the system call args get preserved,
          * in case we need to restart a system call.
          */
-ENTRY(notify_resume_user)
+GLOBAL_ENTRY(notify_resume_user)
         .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
         alloc loc1=ar.pfs,8,2,3,0 // preserve all eight input regs in case of syscall restart!
         mov r9=ar.unat
@@ -1306,7 +1334,7 @@ ENTRY(sys_rt_sigreturn)
         adds sp=16,sp
         ;;
         ld8 r9=[sp]                             // load new ar.unat
-        mov.sptk b7=r8,ia64_leave_kernel
+        mov.sptk b7=r8,ia64_native_leave_kernel
         ;;
         mov ar.unat=r9
         br.many b7
@@ -1665,3 +1693,4 @@ sys_call_table:
         data8 sys_timerfd_gettime
 
         .org sys_call_table + 8*NR_syscalls     // guard against failures to increase NR_syscalls
+#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
diff --git a/arch/ia64/kernel/paravirt.c b/arch/ia64/kernel/paravirt.c
index e5482bb6841e..7126ea8f7ecc 100644
--- a/arch/ia64/kernel/paravirt.c
+++ b/arch/ia64/kernel/paravirt.c
@@ -286,3 +286,22 @@ struct pv_cpu_ops pv_cpu_ops = {
                         = ia64_native_intrin_local_irq_restore_func,
 };
 EXPORT_SYMBOL(pv_cpu_ops);
+
+/******************************************************************************
+ * replacement of hand written assembly codes.
+ */
+
+void
+paravirt_cpu_asm_init(const struct pv_cpu_asm_switch *cpu_asm_switch)
+{
+        extern unsigned long paravirt_switch_to_targ;
+        extern unsigned long paravirt_leave_syscall_targ;
+        extern unsigned long paravirt_work_processed_syscall_targ;
+        extern unsigned long paravirt_leave_kernel_targ;
+
+        paravirt_switch_to_targ = cpu_asm_switch->switch_to;
+        paravirt_leave_syscall_targ = cpu_asm_switch->leave_syscall;
+        paravirt_work_processed_syscall_targ =
+                cpu_asm_switch->work_processed_syscall;
+        paravirt_leave_kernel_targ = cpu_asm_switch->leave_kernel;
+}
diff --git a/arch/ia64/kernel/paravirtentry.S b/arch/ia64/kernel/paravirtentry.S
new file mode 100644
index 000000000000..2f42fcb9776a
--- /dev/null
+++ b/arch/ia64/kernel/paravirtentry.S
@@ -0,0 +1,60 @@
+/******************************************************************************
+ * linux/arch/ia64/xen/paravirtentry.S
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/asm-offsets.h>
+#include "entry.h"
+
+#define DATA8(sym, init_value)                  \
+        .pushsection .data.read_mostly ;        \
+        .align 8 ;                              \
+        .global sym ;                           \
+        sym: ;                                  \
+        data8 init_value ;                      \
+        .popsection
+
+#define BRANCH(targ, reg, breg)         \
+        movl reg=targ ;                 \
+        ;;                              \
+        ld8 reg=[reg] ;                 \
+        ;;                              \
+        mov breg=reg ;                  \
+        br.cond.sptk.many breg
+
+#define BRANCH_PROC(sym, reg, breg)                             \
+        DATA8(paravirt_ ## sym ## _targ, ia64_native_ ## sym) ; \
+        GLOBAL_ENTRY(paravirt_ ## sym) ;                        \
+                BRANCH(paravirt_ ## sym ## _targ, reg, breg) ;  \
+        END(paravirt_ ## sym)
+
+#define BRANCH_PROC_UNWINFO(sym, reg, breg)                     \
+        DATA8(paravirt_ ## sym ## _targ, ia64_native_ ## sym) ; \
+        GLOBAL_ENTRY(paravirt_ ## sym) ;                        \
+                PT_REGS_UNWIND_INFO(0) ;                        \
+                BRANCH(paravirt_ ## sym ## _targ, reg, breg) ;  \
+        END(paravirt_ ## sym)
+
+
+BRANCH_PROC(switch_to, r22, b7)
+BRANCH_PROC_UNWINFO(leave_syscall, r22, b7)
+BRANCH_PROC(work_processed_syscall, r2, b7)
+BRANCH_PROC_UNWINFO(leave_kernel, r22, b7)
diff --git a/include/asm-ia64/native/inst.h b/include/asm-ia64/native/inst.h
index f1072ace0cfa..c953a2ca4fce 100644
--- a/include/asm-ia64/native/inst.h
+++ b/include/asm-ia64/native/inst.h
@@ -22,6 +22,14 @@
 
 #define DO_SAVE_MIN             IA64_NATIVE_DO_SAVE_MIN
 
+#define __paravirt_switch_to                    ia64_native_switch_to
+#define __paravirt_leave_syscall                ia64_native_leave_syscall
+#define __paravirt_work_processed_syscall       ia64_native_work_processed_syscall
+#define __paravirt_leave_kernel                 ia64_native_leave_kernel
+#define __paravirt_pending_syscall_end          ia64_work_pending_syscall_end
+#define __paravirt_work_processed_syscall_target \
+                                                ia64_work_processed_syscall
+
 #ifdef CONFIG_PARAVIRT_GUEST_ASM_CLOBBER_CHECK
 # define PARAVIRT_POISON        0xdeadbeefbaadf00d
 # define CLOBBER(clob)                          \
diff --git a/include/asm-ia64/paravirt_privop.h b/include/asm-ia64/paravirt_privop.h
index 7b133ae86df0..52482e6940ac 100644
--- a/include/asm-ia64/paravirt_privop.h
+++ b/include/asm-ia64/paravirt_privop.h
@@ -80,12 +80,35 @@ extern unsigned long ia64_native_getreg_func(int regnum);
                         ia64_native_rsm(mask);  \
         } while (0)
 
+/******************************************************************************
+ * replacement of hand written assembly codes.
+ */
+struct pv_cpu_asm_switch {
+        unsigned long switch_to;
+        unsigned long leave_syscall;
+        unsigned long work_processed_syscall;
+        unsigned long leave_kernel;
+};
+void paravirt_cpu_asm_init(const struct pv_cpu_asm_switch *cpu_asm_switch);
+
 #endif /* __ASSEMBLY__ */
 
+#define IA64_PARAVIRT_ASM_FUNC(name)    paravirt_ ## name
+
 #else
 
 /* fallback for native case */
+#define IA64_PARAVIRT_ASM_FUNC(name)    ia64_native_ ## name
 
 #endif /* CONFIG_PARAVIRT */
 
+/* these routines utilize privilege-sensitive or performance-sensitive
+ * privileged instructions so the code must be replaced with
+ * paravirtualized versions */
+#define ia64_switch_to                  IA64_PARAVIRT_ASM_FUNC(switch_to)
+#define ia64_leave_syscall              IA64_PARAVIRT_ASM_FUNC(leave_syscall)
+#define ia64_work_processed_syscall     \
+        IA64_PARAVIRT_ASM_FUNC(work_processed_syscall)
+#define ia64_leave_kernel               IA64_PARAVIRT_ASM_FUNC(leave_kernel)
+
 #endif /* _ASM_IA64_PARAVIRT_PRIVOP_H */