1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/cpu/coreboot/coreboot.c b/arch/x86/cpu/coreboot/coreboot.c
index 1c8a007d16..6e196d786c 100644
--- a/arch/x86/cpu/coreboot/coreboot.c
+++ b/arch/x86/cpu/coreboot/coreboot.c
@@ -69,6 +69,27 @@ int board_early_init_r(void)
 
 void show_boot_progress(int val)
 {
+#if MIN_PORT80_KCLOCKS_DELAY
+	static uint32_t prev_stamp;
+	static uint32_t base;
+
+	/*
+	 * Scale the time counter reading to avoid using 64 bit arithmetics.
+	 * Can't use get_timer() here becuase it could be not yet
+	 * initialized or even implemented.
+	 */
+	if (!prev_stamp) {
+		base = rdtsc() / 1000;
+		prev_stamp = 0;
+	} else {
+		uint32_t now;
+
+		do {
+			now = rdtsc() / 1000 - base;
+		} while (now < (prev_stamp + MIN_PORT80_KCLOCKS_DELAY));
+		prev_stamp = now;
+	}
+#endif
 	outb(val, 0x80);
 }