[Xen-devel] [RFC PATCH 19/35] subarch support for control register accesses

[Chris Wright <chrisw@xxxxxxxxxxxx>]

Abstract the code that accesses control register, and
add a separate subarch implementation for Xen.

Signed-off-by: Ian Pratt <ian.pratt@xxxxxxxxxxxxx>
Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
TODO:
- better sharing to avoid unneeded (i.e. read_cr4_safe, stts)

 include/asm-i386/mach-default/mach_system.h |   58 ++++++++++++++++++++++++++++
 include/asm-i386/mach-xen/mach_system.h     |   53 +++++++++++++++++++++++++
 include/asm-i386/system.h                   |   58 ----------------------------
 3 files changed, 111 insertions(+), 58 deletions(-)

--- linus-2.6.orig/include/asm-i386/mach-default/mach_system.h
+++ linus-2.6/include/asm-i386/mach-default/mach_system.h
@@ -3,6 +3,64 @@
 
 #define clearsegment(seg)
 
+/*
+ * Clear and set 'TS' bit respectively
+ */
+#define clts() __asm__ __volatile__ ("clts")
+#define read_cr0() ({ \
+       unsigned int __dummy; \
+       __asm__ __volatile__( \
+               "movl %%cr0,%0\n\t" \
+               :"=r" (__dummy)); \
+       __dummy; \
+})
+#define write_cr0(x) \
+       __asm__ __volatile__("movl %0,%%cr0": :"r" (x));
+
+#define read_cr2() ({ \
+       unsigned int __dummy; \
+       __asm__ __volatile__( \
+               "movl %%cr2,%0\n\t" \
+               :"=r" (__dummy)); \
+       __dummy; \
+})
+#define write_cr2(x) \
+       __asm__ __volatile__("movl %0,%%cr2": :"r" (x));
+
+#define read_cr3() ({ \
+       unsigned int __dummy; \
+       __asm__ ( \
+               "movl %%cr3,%0\n\t" \
+               :"=r" (__dummy)); \
+       __dummy; \
+})
+#define write_cr3(x) \
+       __asm__ __volatile__("movl %0,%%cr3": :"r" (x));
+
+#define read_cr4() ({ \
+       unsigned int __dummy; \
+       __asm__( \
+               "movl %%cr4,%0\n\t" \
+               :"=r" (__dummy)); \
+       __dummy; \
+})
+
+#define read_cr4_safe() ({                           \
+       unsigned int __dummy;                         \
+       /* This could fault if %cr4 does not exist */ \
+       __asm__("1: movl %%cr4, %0              \n"   \
+               "2:                             \n"   \
+               ".section __ex_table,\"a\"      \n"   \
+               ".long 1b,2b                    \n"   \
+               ".previous                      \n"   \
+               : "=r" (__dummy): "0" (0));           \
+       __dummy;                                      \
+})
+
+#define write_cr4(x) \
+       __asm__ __volatile__("movl %0,%%cr4": :"r" (x));
+#define stts() write_cr0(8 | read_cr0())
+
 /* interrupt control.. */
 #define local_save_flags(x)    do { typecheck(unsigned long,x); __asm__ 
__volatile__("pushfl ; popl %0":"=g" (x): /* no input */); } while (0)
 #define local_irq_restore(x)   do { typecheck(unsigned long,x); __asm__ 
__volatile__("pushl %0 ; popfl": /* no output */ :"g" (x):"memory", "cc"); } 
while (0)
--- linus-2.6.orig/include/asm-i386/mach-xen/mach_system.h
+++ linus-2.6/include/asm-i386/mach-xen/mach_system.h
@@ -13,6 +13,59 @@
 #define __vcpu_id 0
 #endif
 
+/*
+ * Clear and set 'TS' bit respectively
+ */
+#define clts() __asm__ __volatile__ ("clts")
+#define read_cr0() ({ \
+       unsigned int __dummy; \
+       __asm__ __volatile__( \
+               "movl %%cr0,%0\n\t" \
+               :"=r" (__dummy)); \
+       __dummy; \
+})
+#define write_cr0(x) \
+       __asm__ __volatile__("movl %0,%%cr0": :"r" (x));
+
+#define read_cr2() \
+       (HYPERVISOR_shared_info->vcpu_info[smp_processor_id()].arch.cr2)
+#define write_cr2(x) \
+       __asm__ __volatile__("movl %0,%%cr2": :"r" (x));
+
+#define read_cr3() ({ \
+       unsigned int __dummy; \
+       __asm__ ( \
+               "movl %%cr3,%0\n\t" \
+               :"=r" (__dummy)); \
+       __dummy; \
+})
+#define write_cr3(x) \
+       __asm__ __volatile__("movl %0,%%cr3": :"r" (x));
+
+#define read_cr4() ({ \
+       unsigned int __dummy; \
+       __asm__( \
+               "movl %%cr4,%0\n\t" \
+               :"=r" (__dummy)); \
+       __dummy; \
+})
+
+#define read_cr4_safe() ({                           \
+       unsigned int __dummy;                         \
+       /* This could fault if %cr4 does not exist */ \
+       __asm__("1: movl %%cr4, %0              \n"   \
+               "2:                             \n"   \
+               ".section __ex_table,\"a\"      \n"   \
+               ".long 1b,2b                    \n"   \
+               ".previous                      \n"   \
+               : "=r" (__dummy): "0" (0));           \
+       __dummy;                                      \
+})
+
+#define write_cr4(x) \
+       __asm__ __volatile__("movl %0,%%cr4": :"r" (x));
+#define stts() write_cr0(8 | read_cr0())
+
 /* interrupt control.. */
 
 /*
--- linus-2.6.orig/include/asm-i386/system.h
+++ linus-2.6/include/asm-i386/system.h
@@ -83,64 +83,6 @@ __asm__ __volatile__ ("movw %%dx,%1\n\t"
 #define savesegment(seg, value) \
        asm volatile("mov %%" #seg ",%0":"=rm" (value))
 
-/*
- * Clear and set 'TS' bit respectively
- */
-#define clts() __asm__ __volatile__ ("clts")
-#define read_cr0() ({ \
-       unsigned int __dummy; \
-       __asm__ __volatile__( \
-               "movl %%cr0,%0\n\t" \
-               :"=r" (__dummy)); \
-       __dummy; \
-})
-#define write_cr0(x) \
-       __asm__ __volatile__("movl %0,%%cr0": :"r" (x));
-
-#define read_cr2() ({ \
-       unsigned int __dummy; \
-       __asm__ __volatile__( \
-               "movl %%cr2,%0\n\t" \
-               :"=r" (__dummy)); \
-       __dummy; \
-})
-#define write_cr2(x) \
-       __asm__ __volatile__("movl %0,%%cr2": :"r" (x));
-
-#define read_cr3() ({ \
-       unsigned int __dummy; \
-       __asm__ ( \
-               "movl %%cr3,%0\n\t" \
-               :"=r" (__dummy)); \
-       __dummy; \
-})
-#define write_cr3(x) \
-       __asm__ __volatile__("movl %0,%%cr3": :"r" (x));
-
-#define read_cr4() ({ \
-       unsigned int __dummy; \
-       __asm__( \
-               "movl %%cr4,%0\n\t" \
-               :"=r" (__dummy)); \
-       __dummy; \
-})
-
-#define read_cr4_safe() ({                           \
-       unsigned int __dummy;                         \
-       /* This could fault if %cr4 does not exist */ \
-       __asm__("1: movl %%cr4, %0              \n"   \
-               "2:                             \n"   \
-               ".section __ex_table,\"a\"      \n"   \
-               ".long 1b,2b                    \n"   \
-               ".previous                      \n"   \
-               : "=r" (__dummy): "0" (0));           \
-       __dummy;                                      \
-})
-
-#define write_cr4(x) \
-       __asm__ __volatile__("movl %0,%%cr4": :"r" (x));
-#define stts() write_cr0(8 | read_cr0())
-
 #endif /* __KERNEL__ */
 
 #define wbinvd() \

--

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