X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=arch%2Fx86%2Fcpu%2Finterrupts.c;h=e733bcb30272fa0da847cac08ca318eac4ee61ee;hb=31bf0f57b2c322500ceccdc6a38b4a8edb7035f0;hp=e7887152f7b27f73559263092b5cc09b7fefbdf4;hpb=095593c0301399ae834050e2008862451a72b8b0;p=u-boot

diff --git a/arch/x86/cpu/interrupts.c b/arch/x86/cpu/interrupts.c
index e7887152f7..e733bcb302 100644
--- a/arch/x86/cpu/interrupts.c
+++ b/arch/x86/cpu/interrupts.c
@@ -34,6 +34,10 @@
 #include <asm/io.h>
 #include <asm/processor-flags.h>
 #include <linux/compiler.h>
+#include <asm/msr.h>
+#include <asm/u-boot-x86.h>
+
+DECLARE_GLOBAL_DATA_PTR;
 
 #define DECLARE_INTERRUPT(x) \
 	".globl irq_"#x"\n" \
@@ -615,3 +619,31 @@ asm(".globl irq_common_entry\n" \
 	DECLARE_INTERRUPT(253) \
 	DECLARE_INTERRUPT(254) \
 	DECLARE_INTERRUPT(255));
+
+#if defined(CONFIG_INTEL_CORE_ARCH)
+/*
+ * Get the number of CPU time counter ticks since it was read first time after
+ * restart. This yields a free running counter guaranteed to take almost 6
+ * years to wrap around even at 100GHz clock rate.
+ */
+u64 get_ticks(void)
+{
+	u64 now_tick = rdtsc();
+
+	if (!gd->arch.tsc_base)
+		gd->arch.tsc_base = now_tick;
+
+	return now_tick - gd->arch.tsc_base;
+}
+
+#define PLATFORM_INFO_MSR 0xce
+
+unsigned long get_tbclk(void)
+{
+	u32 ratio;
+	u64 platform_info = native_read_msr(PLATFORM_INFO_MSR);
+
+	ratio = (platform_info >> 8) & 0xff;
+	return 100 * 1000 * 1000 * ratio; /* 100MHz times Max Non Turbo ratio */
+}
+#endif