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| author | Isaku Yamahata <yamahata@valinux.co.jp> | 2008-10-17 11:18:03 +0900 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2008-10-17 10:05:08 -0700 |
| commit | 5142ec4690943eefc86b01396addf70083a2b9fb (patch) | |
| tree | 0db3ae9566b54be9bfc35fff973ae67f06b94c32 /arch/ia64/xen/xenivt.S | |
| parent | 21820cce1701cf978310efb47d90e5e6a927f6ae (diff) | |
| download | linux-5142ec4690943eefc86b01396addf70083a2b9fb.tar.bz2 | |
ia64/pv_ops/xen: paravirtualize ivt.S for xen.
paravirtualize ivt.S for xen by multi compile.
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/xen/xenivt.S')
| -rw-r--r-- | arch/ia64/xen/xenivt.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/ia64/xen/xenivt.S b/arch/ia64/xen/xenivt.S new file mode 100644 index 000000000000..3e71d50584d9 --- /dev/null +++ b/arch/ia64/xen/xenivt.S @@ -0,0 +1,52 @@ +/* + * arch/ia64/xen/ivt.S + * + * Copyright (C) 2005 Hewlett-Packard Co + * Dan Magenheimer <dan.magenheimer@hp.com> + * + * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp> + * VA Linux Systems Japan K.K. + * pv_ops. + */ + +#include <asm/asmmacro.h> +#include <asm/kregs.h> +#include <asm/pgtable.h> + +#include "../kernel/minstate.h" + + .section .text,"ax" +GLOBAL_ENTRY(xen_event_callback) + mov r31=pr // prepare to save predicates + ;; + SAVE_MIN_WITH_COVER // uses r31; defines r2 and r3 + ;; + movl r3=XSI_PSR_IC + mov r14=1 + ;; + st4 [r3]=r14 + ;; + adds r3=8,r2 // set up second base pointer for SAVE_REST + srlz.i // ensure everybody knows psr.ic is back on + ;; + SAVE_REST + ;; +1: + alloc r14=ar.pfs,0,0,1,0 // must be first in an insn group + add out0=16,sp // pass pointer to pt_regs as first arg + ;; + br.call.sptk.many b0=xen_evtchn_do_upcall + ;; + movl r20=XSI_PSR_I_ADDR + ;; + ld8 r20=[r20] + ;; + adds r20=-1,r20 // vcpu_info->evtchn_upcall_pending + ;; + ld1 r20=[r20] + ;; + cmp.ne p6,p0=r20,r0 // if there are pending events, + (p6) br.spnt.few 1b // call evtchn_do_upcall again. + br.sptk.many xen_leave_kernel // we know ia64_leave_kernel is + // paravirtualized as xen_leave_kernel +END(xen_event_callback) |