hv:move 'udelay' to timer.c

-- move this api from misc.c to timer.c to avoid
   reverse dependency, and remove misc.c

Tracked-On: #1842
Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>

Author: mingqiangchi

hypervisor/Makefile

@@ -189,7 +189,6 @@ C_SRCS += arch/x86/guest/vmexit.c
 S_SRCS += arch/x86/guest/vmx_asm.S
 C_SRCS += arch/x86/guest/trusty.c
 C_SRCS += arch/x86/cat.c
-C_SRCS += lib/misc.c
 C_SRCS += lib/string.c
 C_SRCS += lib/memory.c
 C_SRCS += lib/crypto/crypto_api.c

hypervisor/arch/x86/timer.c

@@ -318,3 +318,16 @@ uint64_t ticks_to_ms(uint64_t ticks)
 {
 	return ticks / (uint64_t)tsc_khz;
 }
+
+void udelay(uint32_t us)
+{
+	uint64_t dest_tsc, delta_tsc;
+
+	/* Calculate number of ticks to wait */
+	delta_tsc = us_to_ticks(us);
+	dest_tsc = rdtsc() + delta_tsc;
+
+	/* Loop until time expired */
+	while (rdtsc() < dest_tsc) {
+	}
+}

hypervisor/include/arch/x86/timer.h

@@ -49,6 +49,8 @@ struct hv_timer {
 
 #define CYCLES_PER_MS	us_to_ticks(1000U)
 
+void udelay(uint32_t us);
+
 /**
  * @brief convert us to ticks.
  *

hypervisor/include/lib/rtl.h

@@ -30,7 +30,6 @@ static inline bool is_space(char c)
 }
 
 /* Function prototypes */
-void udelay(uint32_t us);
 int32_t strcmp(const char *s1_arg, const char *s2_arg);
 int32_t strncmp(const char *s1_arg, const char *s2_arg, size_t n_arg);
 char *strncpy_s(char *d_arg, size_t dmax, const char *s_arg, size_t slen_arg);