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authorThomas Gleixner <tglx@linutronix.de>2007-10-11 11:20:03 +0200
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 11:20:03 +0200
commit96a388de5dc53a8b234b3fd41f3ae2cedc9ffd42 (patch)
treed947a467aa2da3140279617bc4b9b101640d7bf4 /include/asm-x86/processor-cyrix.h
parent27bd0c955648646abf2a353a8371d28c37bcd982 (diff)
downloadblackbird-op-linux-96a388de5dc53a8b234b3fd41f3ae2cedc9ffd42.tar.gz
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i386/x86_64: move headers to include/asm-x86
Move the headers to include/asm-x86 and fixup the header install make rules Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86/processor-cyrix.h')
-rw-r--r--include/asm-x86/processor-cyrix.h30
1 files changed, 30 insertions, 0 deletions
diff --git a/include/asm-x86/processor-cyrix.h b/include/asm-x86/processor-cyrix.h
new file mode 100644
index 000000000000..97568ada1f97
--- /dev/null
+++ b/include/asm-x86/processor-cyrix.h
@@ -0,0 +1,30 @@
+/*
+ * NSC/Cyrix CPU indexed register access. Must be inlined instead of
+ * macros to ensure correct access ordering
+ * Access order is always 0x22 (=offset), 0x23 (=value)
+ *
+ * When using the old macros a line like
+ * setCx86(CX86_CCR2, getCx86(CX86_CCR2) | 0x88);
+ * gets expanded to:
+ * do {
+ * outb((CX86_CCR2), 0x22);
+ * outb((({
+ * outb((CX86_CCR2), 0x22);
+ * inb(0x23);
+ * }) | 0x88), 0x23);
+ * } while (0);
+ *
+ * which in fact violates the access order (= 0x22, 0x22, 0x23, 0x23).
+ */
+
+static inline u8 getCx86(u8 reg)
+{
+ outb(reg, 0x22);
+ return inb(0x23);
+}
+
+static inline void setCx86(u8 reg, u8 data)
+{
+ outb(reg, 0x22);
+ outb(data, 0x23);
+}
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