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[Xen-ia64-devel] [PATCH 21/32] ia64/pv_ops/xen: paravirtualize DO_SAVE_M
paravirtualize DO_SAVE_MIN in minstate.h for xen.
Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@xxxxxxxxx>
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
arch/ia64/include/asm/xen/inst.h | 2 +
arch/ia64/include/asm/xen/minstate.h | 134 ++++++++++++++++++++++++++++++++++
2 files changed, 136 insertions(+), 0 deletions(-)
create mode 100644 arch/ia64/include/asm/xen/minstate.h
diff --git a/arch/ia64/include/asm/xen/inst.h b/arch/ia64/include/asm/xen/inst.h
index 03895e9..1e92ed0 100644
--- a/arch/ia64/include/asm/xen/inst.h
+++ b/arch/ia64/include/asm/xen/inst.h
@@ -22,6 +22,8 @@
#include <asm/xen/privop.h>
+#define DO_SAVE_MIN XEN_DO_SAVE_MIN
+
#define MOV_FROM_IFA(reg) \
movl reg = XSI_IFA; \
;; \
diff --git a/arch/ia64/include/asm/xen/minstate.h
b/arch/ia64/include/asm/xen/minstate.h
new file mode 100644
index 0000000..4d92d9b
--- /dev/null
+++ b/arch/ia64/include/asm/xen/minstate.h
@@ -0,0 +1,134 @@
+/*
+ * DO_SAVE_MIN switches to the kernel stacks (if necessary) and saves
+ * the minimum state necessary that allows us to turn psr.ic back
+ * on.
+ *
+ * Assumed state upon entry:
+ * psr.ic: off
+ * r31: contains saved predicates (pr)
+ *
+ * Upon exit, the state is as follows:
+ * psr.ic: off
+ * r2 = points to &pt_regs.r16
+ * r8 = contents of ar.ccv
+ * r9 = contents of ar.csd
+ * r10 = contents of ar.ssd
+ * r11 = FPSR_DEFAULT
+ * r12 = kernel sp (kernel virtual address)
+ * r13 = points to current task_struct (kernel virtual address)
+ * p15 = TRUE if psr.i is set in cr.ipsr
+ * predicate registers (other than p2, p3, and p15), b6, r3, r14, r15:
+ * preserved
+ * CONFIG_XEN note: p6/p7 are not preserved
+ *
+ * Note that psr.ic is NOT turned on by this macro. This is so that
+ * we can pass interruption state as arguments to a handler.
+ */
+#define XEN_DO_SAVE_MIN(__COVER,SAVE_IFS,EXTRA,WORKAROUND)
\
+ mov r16=IA64_KR(CURRENT); /* M */
\
+ mov r27=ar.rsc; /* M */
\
+ mov r20=r1; /* A */
\
+ mov r25=ar.unat; /* M */
\
+ MOV_FROM_IPSR(p0,r29); /* M */
\
+ MOV_FROM_IIP(r28); /* M */
\
+ mov r21=ar.fpsr; /* M */
\
+ mov r26=ar.pfs; /* I */
\
+ __COVER; /* B;; (or nothing) */
\
+ adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16;
\
+ ;;
\
+ ld1 r17=[r16]; /* load
current->thread.on_ustack flag */ \
+ st1 [r16]=r0; /* clear
current->thread.on_ustack flag */ \
+ adds r1=-IA64_TASK_THREAD_ON_USTACK_OFFSET,r16
\
+ /* switch from user to kernel RBS: */
\
+ ;;
\
+ invala; /* M */
\
+ /* SAVE_IFS;*/ /* see xen special handling below */
\
+ cmp.eq pKStk,pUStk=r0,r17; /* are we in kernel mode
already? */ \
+ ;;
\
+(pUStk) mov ar.rsc=0; /* set enforced lazy mode, pl 0,
little-endian, loadrs=0 */ \
+ ;;
\
+(pUStk) mov.m r24=ar.rnat;
\
+(pUStk) addl r22=IA64_RBS_OFFSET,r1; /* compute base
of RBS */ \
+(pKStk) mov r1=sp; /* get sp */
\
+ ;;
\
+(pUStk) lfetch.fault.excl.nt1 [r22];
\
+(pUStk) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1; /* compute base
of memory stack */ \
+(pUStk) mov r23=ar.bspstore; /* save
ar.bspstore */ \
+ ;;
\
+(pUStk) mov ar.bspstore=r22; /* switch to
kernel RBS */ \
+(pKStk) addl r1=-IA64_PT_REGS_SIZE,r1; /* if in kernel mode,
use sp (r12) */ \
+ ;;
\
+(pUStk) mov r18=ar.bsp;
\
+(pUStk) mov ar.rsc=0x3; /* set eager mode, pl 0, little-endian,
loadrs=0 */ \
+ adds r17=2*L1_CACHE_BYTES,r1; /* really: biggest cache-line
size */ \
+ adds r16=PT(CR_IPSR),r1;
\
+ ;;
\
+ lfetch.fault.excl.nt1 [r17],L1_CACHE_BYTES;
\
+ st8 [r16]=r29; /* save cr.ipsr */
\
+ ;;
\
+ lfetch.fault.excl.nt1 [r17];
\
+ tbit.nz p15,p0=r29,IA64_PSR_I_BIT;
\
+ mov r29=b0
\
+ ;;
\
+ WORKAROUND;
\
+ adds r16=PT(R8),r1; /* initialize first base pointer */
\
+ adds r17=PT(R9),r1; /* initialize second base pointer */
\
+(pKStk) mov r18=r0; /* make sure r18 isn't NaT */
\
+ ;;
\
+.mem.offset 0,0; st8.spill [r16]=r8,16;
\
+.mem.offset 8,0; st8.spill [r17]=r9,16;
\
+ ;;
\
+.mem.offset 0,0; st8.spill [r16]=r10,24;
\
+ movl r8=XSI_PRECOVER_IFS;
\
+.mem.offset 8,0; st8.spill [r17]=r11,24;
\
+ ;;
\
+ /* xen special handling for possibly lazy cover */
\
+ /* SAVE_MIN case in dispatch_ia32_handler: mov r30=r0 */
\
+ ld8 r30=[r8];
\
+(pUStk) sub r18=r18,r22; /* r18=RSE.ndirty*8 */
\
+ st8 [r16]=r28,16; /* save cr.iip */
\
+ ;;
\
+ st8 [r17]=r30,16; /* save cr.ifs */
\
+ mov r8=ar.ccv;
\
+ mov r9=ar.csd;
\
+ mov r10=ar.ssd;
\
+ movl r11=FPSR_DEFAULT; /* L-unit */
\
+ ;;
\
+ st8 [r16]=r25,16; /* save ar.unat */
\
+ st8 [r17]=r26,16; /* save ar.pfs */
\
+ shl r18=r18,16; /* compute ar.rsc to be used for "loadrs" */
\
+ ;;
\
+ st8 [r16]=r27,16; /* save ar.rsc */
\
+(pUStk) st8 [r17]=r24,16; /* save ar.rnat */
\
+(pKStk) adds r17=16,r17; /* skip over ar_rnat field */
\
+ ;; /* avoid RAW on r16 & r17 */
\
+(pUStk) st8 [r16]=r23,16; /* save ar.bspstore */
\
+ st8 [r17]=r31,16; /* save predicates */
\
+(pKStk) adds r16=16,r16; /* skip over ar_bspstore field */
\
+ ;;
\
+ st8 [r16]=r29,16; /* save b0 */
\
+ st8 [r17]=r18,16; /* save ar.rsc value for "loadrs" */
\
+ cmp.eq pNonSys,pSys=r0,r0 /* initialize pSys=0, pNonSys=1 */
\
+ ;;
\
+.mem.offset 0,0; st8.spill [r16]=r20,16; /* save original r1 */
\
+.mem.offset 8,0; st8.spill [r17]=r12,16;
\
+ adds r12=-16,r1; /* switch to kernel memory stack (with 16 bytes
of scratch) */ \
+ ;;
\
+.mem.offset 0,0; st8.spill [r16]=r13,16;
\
+.mem.offset 8,0; st8.spill [r17]=r21,16; /* save ar.fpsr */
\
+ mov r13=IA64_KR(CURRENT); /* establish `current' */
\
+ ;;
\
+.mem.offset 0,0; st8.spill [r16]=r15,16;
\
+.mem.offset 8,0; st8.spill [r17]=r14,16;
\
+ ;;
\
+.mem.offset 0,0; st8.spill [r16]=r2,16;
\
+.mem.offset 8,0; st8.spill [r17]=r3,16;
\
+ ACCOUNT_GET_STAMP
\
+ adds r2=IA64_PT_REGS_R16_OFFSET,r1;
\
+ ;;
\
+ EXTRA;
\
+ movl r1=__gp; /* establish kernel global pointer */
\
+ ;;
\
+ ACCOUNT_SYS_ENTER
\
+ BSW_1(r3,r14); /* switch back to bank 1 (must be last in insn group)
*/ \
+ ;;
--
1.6.0.2
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