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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-ia64-devel] [PATCH 15/50] ia64/pv_ops: preparation for paravirtualizatin of switch_leave.S and ivt.S
make some symbol global and add some hooks.
define __IA64_ASM_PARAVIRTUALIZED_NATIVE to tell its native compilation
when compiling ivt.S and switch_leave.S
replace COVER with __COVER to avoid name conflict.
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
arch/ia64/kernel/Makefile | 6 ++++++
arch/ia64/kernel/entry.S | 4 ++--
arch/ia64/kernel/minstate.h | 6 ++++--
arch/ia64/kernel/switch_leave.S | 19 ++++++++++---------
include/asm-ia64/privop.h | 26 ++++++++++++++++++++++++++
5 files changed, 48 insertions(+), 13 deletions(-)
create mode 100644 include/asm-ia64/privop.h
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index f9bc3c4..9281bf6 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -70,3 +70,9 @@ $(obj)/gate-syms.o: $(obj)/gate.lds $(obj)/gate.o FORCE
# We must build gate.so before we can assemble it.
# Note: kbuild does not track this dependency due to usage of .incbin
$(obj)/gate-data.o: $(obj)/gate.so
+
+#
+# native ivt.S and switch_leave.S
+#
+AFLAGS_ivt.o += -D__IA64_ASM_PARAVIRTUALIZED_NATIVE
+AFLAGS_switch_leave.o += -D__IA64_ASM_PARAVIRTUALIZED_NATIVE
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index df8dcc9..de91f61 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -304,7 +304,7 @@ 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
@@ -624,7 +624,7 @@ END(ia64_invoke_schedule_tail)
* be set up by the caller. 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
diff --git a/arch/ia64/kernel/minstate.h b/arch/ia64/kernel/minstate.h
index c9ac8ba..fc99141 100644
--- a/arch/ia64/kernel/minstate.h
+++ b/arch/ia64/kernel/minstate.h
@@ -3,6 +3,7 @@
#include "entry.h"
+#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
/*
* DO_SAVE_MIN switches to the kernel stacks (if necessary) and saves
* the minimum state necessary that allows us to turn psr.ic back
@@ -28,7 +29,7 @@
* 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 DO_SAVE_MIN(COVER,SAVE_IFS,EXTRA)
\
+#define DO_SAVE_MIN(__COVER,SAVE_IFS,EXTRA)
\
mov r16=IA64_KR(CURRENT); /* M */
\
mov r27=ar.rsc; /* M */
\
mov r20=r1; /* A */
\
@@ -37,7 +38,7 @@
mov r26=ar.pfs; /* I */
\
mov r28=cr.iip; /* M */
\
mov r21=ar.fpsr; /* M */
\
- COVER; /* B;; (or nothing) */
\
+ __COVER; /* B;; (or nothing) */
\
;;
\
adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16;
\
;;
\
@@ -129,6 +130,7 @@
;;
\
bsw.1; /* switch back to bank 1 (must be last in insn
group) */ \
;;
+#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
/*
* SAVE_REST saves the remainder of pt_regs (with psr.ic on).
diff --git a/arch/ia64/kernel/switch_leave.S b/arch/ia64/kernel/switch_leave.S
index 5ca5b84..9918160 100644
--- a/arch/ia64/kernel/switch_leave.S
+++ b/arch/ia64/kernel/switch_leave.S
@@ -53,7 +53,7 @@
* 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(native_switch_to)
.prologue
alloc r16=ar.pfs,1,0,0,0
DO_SAVE_SWITCH_STACK
@@ -107,7 +107,7 @@ GLOBAL_ENTRY(ia64_switch_to)
;;
srlz.d
br.cond.sptk .done
-END(ia64_switch_to)
+END(native_switch_to)
/*
* ia64_leave_syscall(): Same as ia64_leave_kernel, except that it doesn't
@@ -153,7 +153,7 @@ END(ia64_switch_to)
* ar.csd: cleared
* ar.ssd: cleared
*/
-ENTRY(ia64_leave_syscall)
+GLOBAL_ENTRY(native_leave_syscall)
PT_REGS_UNWIND_INFO(0)
/*
* work.need_resched etc. mustn't get changed by this CPU before it
returns to
@@ -163,7 +163,7 @@ 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
@@ -181,7 +181,8 @@ ENTRY(ia64_leave_syscall)
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 native_work_processed_syscall;
+native_work_processed_syscall:
adds r2=PT(LOADRS)+16,r12
adds r3=PT(AR_BSPSTORE)+16,r12
adds r18=TI_FLAGS+IA64_TASK_SIZE,r13
@@ -260,9 +261,9 @@ 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(native_leave_syscall)
-GLOBAL_ENTRY(ia64_leave_kernel)
+GLOBAL_ENTRY(native_leave_kernel)
PT_REGS_UNWIND_INFO(0)
/*
* work.need_resched etc. mustn't get changed by this CPU before it
returns to
@@ -590,5 +591,5 @@ ia64_work_pending_syscall_end:
;;
ld8 r8=[r2]
ld8 r10=[r3]
- br.cond.sptk.many .work_processed_syscall // re-check
-END(ia64_leave_kernel)
+ br.cond.sptk.many ia64_work_processed_syscall // re-check
+END(native_leave_kernel)
diff --git a/include/asm-ia64/privop.h b/include/asm-ia64/privop.h
new file mode 100644
index 0000000..11d26f7
--- /dev/null
+++ b/include/asm-ia64/privop.h
@@ -0,0 +1,26 @@
+#ifndef _ASM_IA64_PRIVOP_H
+#define _ASM_IA64_PRIVOP_H
+
+#ifndef _ASM_IA64_INTRINSICS_H
+#error "don't include privop.h directly. instead include intrinsics.h"
+#endif
+/*
+ * Copyright (C) 2005 Hewlett-Packard Co
+ * Dan Magenheimer <dan.magenheimer@xxxxxx>
+ *
+ */
+
+#ifdef CONFIG_XEN
+#include <asm/xen/privop.h>
+#endif
+
+/* fallback for native case */
+
+#ifndef IA64_PARAVIRTUALIZED_ENTRY
+#define ia64_switch_to native_switch_to
+#define ia64_leave_syscall native_leave_syscall
+#define ia64_work_processed_syscall native_work_processed_syscall
+#define ia64_leave_kernel native_leave_kernel
+#endif /* !IA64_PARAVIRTUALIZED_ENTRY */
+
+#endif /* _ASM_IA64_PRIVOP_H */
--
1.5.3
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