Add rdtsc implementation and get efiwarpper start tsc

Test Done: boot success Tracked-On: OAM-115655 Signed-off-by: Chen, Gang G <[email protected]>
projectceladon · Feb 20, 2024 · 26c222a · 26c222a
1 parent 708fcec
commit 26c222a
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diff --git a/include/libefiwrapper/rdtsc.h b/include/libefiwrapper/rdtsc.h
@@ -0,0 +1,14 @@
+#ifndef RDTSC_H
+#define RDTSC_H
+
+#include <stdint.h>
+
+static uint64_t rdtsc(void)
+{
+	uint32_t lo, hi;
+
+	asm volatile ("rdtsc" : "=a" (lo), "=d" (hi));
+	return (uint64_t) hi << 32 | lo;
+}
+
+#endif
diff --git a/main.c b/main.c
@@ -37,13 +37,23 @@
 #include <ewdrv.h>
 #include <ewlog.h>
 #include <storage.h>
+#include <rdtsc.h>
+
+static uint64_t efiwarpper_start_tsc;
+uint64_t efiwrapper_tsc()
+{
+	return efiwarpper_start_tsc;
+}
+
 /* Entry point */
 int main(int argc, char **argv)
 {
 	EFI_HANDLE image = NULL;
 	EFI_SYSTEM_TABLE *st;
 	EFI_STATUS ret;
 
+	efiwarpper_start_tsc = rdtsc();
+
 	ret = efiwrapper_init(argc, argv, &st, &image);
 	if (ret) {
 		ewerr("efiwrapper library initialization failed");