hv: clean up udelay/mdelay related code

- replace the usage of mdelay with udelay
- remove lib/mdelay.c
- rename udelay.c to misc.c
  future other small APIs could put in misc.c

Tracked-On: #861
Signed-off-by: Shiqing Gao <shiqing.gao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/Makefile

@@ -152,8 +152,7 @@ C_SRCS += arch/x86/guest/instr_emul.c
 C_SRCS += arch/x86/guest/ucode.c
 C_SRCS += arch/x86/guest/pm.c
 C_SRCS += lib/spinlock.c
-C_SRCS += lib/udelay.c
-C_SRCS += lib/mdelay.c
+C_SRCS += lib/misc.c
 C_SRCS += lib/string.c
 C_SRCS += lib/memory.c
 C_SRCS += lib/crypto/hkdf_wrap.c

hypervisor/arch/x86/lapic.c

@@ -382,8 +382,10 @@ send_startup_ipi(enum intr_cpu_startup_shorthand cpu_startup_shorthand,
 	/* Give 10ms for INIT sequence to complete for old processors.
 	 * Modern processors (family == 6) don't need to wait here.
 	 */
-	if (boot_cpu_data.family != 6U)
-		mdelay(10U);
+	if (boot_cpu_data.family != 6U) {
+		/* delay 10ms */
+		udelay(10000U);
+	}
 
 	/* De-assert INIT IPI */
 	write_lapic_reg32(LAPIC_INT_COMMAND_REGISTER_1, icr.value_32.hi_32);

hypervisor/include/lib/rtl.h

@@ -27,7 +27,6 @@ int strncmp(const char *s1_arg, const char *s2_arg, size_t n_arg);
 char *strcpy_s(char *d_arg, size_t dmax, const char *s_arg);
 char *strncpy_s(char *d_arg, size_t dmax, const char *s_arg, size_t slen_arg);
 char *strchr(const char *s_arg, int ch);
-void mdelay(uint32_t loop_count_arg);
 size_t strnlen_s(const char *str_arg, size_t maxlen_arg);
 void *memset(void *base, uint8_t v, size_t n);
 void *memcpy_s(void *d, size_t dmax, const void *s, size_t slen_arg);

hypervisor/lib/mdelay.c

@@ -1,18 +0,0 @@
-/*
- * Copyright (C) 2018 Intel Corporation. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <hv_lib.h>
-
-void mdelay(uint32_t loop_count_arg)
-{
-	uint32_t loop_count = loop_count_arg;
-	/* Loop until done */
-	while (loop_count != 0U) {
-		/* Delay for 1 ms */
-		udelay(1000U);
-		loop_count--;
-	}
-}