This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / ia64 / xen / xenpal.S

diff --git a/arch/ia64/xen/xenpal.S b/arch/ia64/xen/xenpal.S
new file mode 100644 (file)
index 0000000..5f9681e
--- /dev/null
+++ b/arch/ia64/xen/xenpal.S
@@ -0,0 +1,76 @@
+/*
+ * ia64/xen/xenpal.S
+ *
+ * Alternate PAL  routines for Xen.  Heavily leveraged from
+ *   ia64/kernel/pal.S
+ *
+ * Copyright (C) 2005 Hewlett-Packard Co
+ *     Dan Magenheimer <dan.magenheimer@.hp.com>
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/processor.h>
+
+GLOBAL_ENTRY(xen_pal_call_static)
+       .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(5)
+       alloc loc1 = ar.pfs,5,5,0,0
+#ifdef CONFIG_XEN
+       movl r22=running_on_xen;;
+       ld4 r22=[r22];;
+       cmp.eq p7,p0=r22,r0
+(p7)   br.cond.spnt.many __ia64_pal_call_static;;
+#endif
+       movl loc2 = pal_entry_point
+1:     {
+         mov r28 = in0
+         mov r29 = in1
+         mov r8 = ip
+       }
+       ;;
+       ld8 loc2 = [loc2]               // loc2 <- entry point
+       tbit.nz p6,p7 = in4, 0
+       adds r8 = 1f-1b,r8
+       mov loc4=ar.rsc                 // save RSE configuration
+       ;;
+       mov ar.rsc=0                    // put RSE in enforced lazy, LE mode
+       mov loc3 = psr
+       mov loc0 = rp
+       .body
+       mov r30 = in2
+
+#ifdef CONFIG_XEN
+       // this is low priority for paravirtualization, but is called
+       // from the idle loop so confuses privop counting
+       movl r31=XSI_PSR_IC
+       ;;
+(p6)   st4 [r31]=r0
+       ;;
+(p7)   adds r31=XSI_PSR_I_ADDR_OFS-XSI_PSR_IC_OFS,r31
+(p7)   mov r22=1
+       ;;
+(p7)   ld8 r31=[r31]
+       ;;
+(p7)   st1 [r31]=r22
+       ;;
+       mov r31 = in3
+       mov b7 = loc2
+       ;;
+#else
+(p6)   rsm psr.i | psr.ic
+       mov r31 = in3
+       mov b7 = loc2
+
+(p7)   rsm psr.i
+       ;;
+(p6)   srlz.i
+#endif
+       mov rp = r8
+       br.cond.sptk.many b7
+1:     mov psr.l = loc3
+       mov ar.rsc = loc4               // restore RSE configuration
+       mov ar.pfs = loc1
+       mov rp = loc0
+       ;;
+       srlz.d                          // seralize restoration of psr.l
+       br.ret.sptk.many b0
+END(xen_pal_call_static)