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-rw-r--r--arch/x86/cpu/coreboot/coreboot.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/cpu/coreboot/coreboot.c b/arch/x86/cpu/coreboot/coreboot.c
index 1c8a007..6e196d7 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);
}