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Diffstat (limited to 'arch/x86/include/asm/special_insns.h')
-rw-r--r--arch/x86/include/asm/special_insns.h199
1 files changed, 199 insertions, 0 deletions
diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
new file mode 100644
index 000000000000..41fc93a2e225
--- /dev/null
+++ b/arch/x86/include/asm/special_insns.h
@@ -0,0 +1,199 @@
+#ifndef _ASM_X86_SPECIAL_INSNS_H
+#define _ASM_X86_SPECIAL_INSNS_H
+
+
+#ifdef __KERNEL__
+
+static inline void native_clts(void)
+{
+ asm volatile("clts");
+}
+
+/*
+ * Volatile isn't enough to prevent the compiler from reordering the
+ * read/write functions for the control registers and messing everything up.
+ * A memory clobber would solve the problem, but would prevent reordering of
+ * all loads stores around it, which can hurt performance. Solution is to
+ * use a variable and mimic reads and writes to it to enforce serialization
+ */
+static unsigned long __force_order;
+
+static inline unsigned long native_read_cr0(void)
+{
+ unsigned long val;
+ asm volatile("mov %%cr0,%0\n\t" : "=r" (val), "=m" (__force_order));
+ return val;
+}
+
+static inline void native_write_cr0(unsigned long val)
+{
+ asm volatile("mov %0,%%cr0": : "r" (val), "m" (__force_order));
+}
+
+static inline unsigned long native_read_cr2(void)
+{
+ unsigned long val;
+ asm volatile("mov %%cr2,%0\n\t" : "=r" (val), "=m" (__force_order));
+ return val;
+}
+
+static inline void native_write_cr2(unsigned long val)
+{
+ asm volatile("mov %0,%%cr2": : "r" (val), "m" (__force_order));
+}
+
+static inline unsigned long native_read_cr3(void)
+{
+ unsigned long val;
+ asm volatile("mov %%cr3,%0\n\t" : "=r" (val), "=m" (__force_order));
+ return val;
+}
+
+static inline void native_write_cr3(unsigned long val)
+{
+ asm volatile("mov %0,%%cr3": : "r" (val), "m" (__force_order));
+}
+
+static inline unsigned long native_read_cr4(void)
+{
+ unsigned long val;
+ asm volatile("mov %%cr4,%0\n\t" : "=r" (val), "=m" (__force_order));
+ return val;
+}
+
+static inline unsigned long native_read_cr4_safe(void)
+{
+ unsigned long val;
+ /* This could fault if %cr4 does not exist. In x86_64, a cr4 always
+ * exists, so it will never fail. */
+#ifdef CONFIG_X86_32
+ asm volatile("1: mov %%cr4, %0\n"
+ "2:\n"
+ _ASM_EXTABLE(1b, 2b)
+ : "=r" (val), "=m" (__force_order) : "0" (0));
+#else
+ val = native_read_cr4();
+#endif
+ return val;
+}
+
+static inline void native_write_cr4(unsigned long val)
+{
+ asm volatile("mov %0,%%cr4": : "r" (val), "m" (__force_order));
+}
+
+#ifdef CONFIG_X86_64
+static inline unsigned long native_read_cr8(void)
+{
+ unsigned long cr8;
+ asm volatile("movq %%cr8,%0" : "=r" (cr8));
+ return cr8;
+}
+
+static inline void native_write_cr8(unsigned long val)
+{
+ asm volatile("movq %0,%%cr8" :: "r" (val) : "memory");
+}
+#endif
+
+static inline void native_wbinvd(void)
+{
+ asm volatile("wbinvd": : :"memory");
+}
+
+extern void native_load_gs_index(unsigned);
+
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+
+static inline unsigned long read_cr0(void)
+{
+ return native_read_cr0();
+}
+
+static inline void write_cr0(unsigned long x)
+{
+ native_write_cr0(x);
+}
+
+static inline unsigned long read_cr2(void)
+{
+ return native_read_cr2();
+}
+
+static inline void write_cr2(unsigned long x)
+{
+ native_write_cr2(x);
+}
+
+static inline unsigned long read_cr3(void)
+{
+ return native_read_cr3();
+}
+
+static inline void write_cr3(unsigned long x)
+{
+ native_write_cr3(x);
+}
+
+static inline unsigned long read_cr4(void)
+{
+ return native_read_cr4();
+}
+
+static inline unsigned long read_cr4_safe(void)
+{
+ return native_read_cr4_safe();
+}
+
+static inline void write_cr4(unsigned long x)
+{
+ native_write_cr4(x);
+}
+
+static inline void wbinvd(void)
+{
+ native_wbinvd();
+}
+
+#ifdef CONFIG_X86_64
+
+static inline unsigned long read_cr8(void)
+{
+ return native_read_cr8();
+}
+
+static inline void write_cr8(unsigned long x)
+{
+ native_write_cr8(x);
+}
+
+static inline void load_gs_index(unsigned selector)
+{
+ native_load_gs_index(selector);
+}
+
+#endif
+
+/* Clear the 'TS' bit */
+static inline void clts(void)
+{
+ native_clts();
+}
+
+#endif/* CONFIG_PARAVIRT */
+
+#define stts() write_cr0(read_cr0() | X86_CR0_TS)
+
+static inline void clflush(volatile void *__p)
+{
+ asm volatile("clflush %0" : "+m" (*(volatile char __force *)__p));
+}
+
+#define nop() asm volatile ("nop")
+
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_X86_SPECIAL_INSNS_H */