X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-x86%2Facpi.h;h=f8a89793ac8cbb865dbedb2b70181236d2a4288d;hb=c2a7dcad9f0d92d7a96e735abb8bec7b9c621536;hp=0693689d4146bdb1be887638a8c6ade246843e35;hpb=b981d8b3f5e008ff10d993be633ad00564fc22cd;p=linux-2.6

diff --git a/include/asm-x86/acpi.h b/include/asm-x86/acpi.h
index 0693689d41..f8a89793ac 100644
--- a/include/asm-x86/acpi.h
+++ b/include/asm-x86/acpi.h
@@ -1,5 +1,32 @@
+#ifndef _ASM_X86_ACPI_H
+#define _ASM_X86_ACPI_H
+
 #ifdef CONFIG_X86_32
 # include "acpi_32.h"
 #else
 # include "acpi_64.h"
 #endif
+
+#include <asm/processor.h>
+
+/*
+ * Check if the CPU can handle C2 and deeper
+ */
+static inline unsigned int acpi_processor_cstate_check(unsigned int max_cstate)
+{
+	/*
+	 * Early models (<=5) of AMD Opterons are not supposed to go into
+	 * C2 state.
+	 *
+	 * Steppings 0x0A and later are good
+	 */
+	if (boot_cpu_data.x86 == 0x0F &&
+	    boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
+	    boot_cpu_data.x86_model <= 0x05 &&
+	    boot_cpu_data.x86_mask < 0x0A)
+		return 1;
+	else
+		return max_cstate;
+}
+
+#endif