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64 #ifndef _RTE_CYCLES_H_
65 #define _RTE_CYCLES_H_
70 * Simple Time Reference Functions (Cycles and HPET).
78 #include <rte_debug.h>
80 #ifdef RTE_LIBRTE_EAL_VMWARE_TSC_MAP_SUPPORT
81 /** Global switch to use VMWARE mapping of TSC instead of RDTSC */
82 extern int rte_cycles_vmware_tsc_map;
83 #include <rte_branch_prediction.h>
87 #define US_PER_S 1000000
88 #define NS_PER_S 1000000000
94 extern enum timer_source eal_timer_source;
97 * Read the TSC register.
100 * The TSC for this lcore.
102 static inline uint64_t
113 #ifdef RTE_LIBRTE_EAL_VMWARE_TSC_MAP_SUPPORT
114 if (unlikely(rte_cycles_vmware_tsc_map)) {
115 /* ecx = 0x10000 corresponds to the physical TSC for VMware */
116 asm volatile("rdpmc" :
124 asm volatile("rdtsc" :
131 * Get the measured frequency of the RDTSC counter
134 * The TSC frequency for this lcore
137 rte_get_tsc_hz(void);
140 * Return the number of TSC cycles since boot
143 * the number of cycles
145 static inline uint64_t
146 rte_get_tsc_cycles(void) { return rte_rdtsc(); }
148 #ifdef RTE_LIBEAL_USE_HPET
150 * Return the number of HPET cycles since boot
152 * This counter is global for all execution units. The number of
153 * cycles in one second can be retrieved using rte_get_hpet_hz().
156 * the number of cycles
159 rte_get_hpet_cycles(void);
162 * Get the number of HPET cycles in one second.
165 * The number of cycles in one second.
168 rte_get_hpet_hz(void);
171 * Initialise the HPET for use. This must be called before the rte_get_hpet_hz
172 * and rte_get_hpet_cycles APIs are called. If this function does not succeed,
173 * then the HPET functions are unavailable and should not be called.
175 * @param make_default
176 * If set, the hpet timer becomes the default timer whose values are
177 * returned by the rte_get_timer_hz/cycles API calls
181 * -1 on error, and the make_default parameter is ignored.
183 int rte_eal_hpet_init(int make_default);
188 * Get the number of cycles since boot from the default timer.
191 * The number of cycles
193 static inline uint64_t
194 rte_get_timer_cycles(void)
196 switch(eal_timer_source) {
200 #ifdef RTE_LIBEAL_USE_HPET
201 return rte_get_hpet_cycles();
203 default: rte_panic("Invalid timer source specified\n");
208 * Get the number of cycles in one second for the default timer.
211 * The number of cycles in one second.
213 static inline uint64_t
214 rte_get_timer_hz(void)
216 switch(eal_timer_source) {
218 return rte_get_tsc_hz();
220 #ifdef RTE_LIBEAL_USE_HPET
221 return rte_get_hpet_hz();
223 default: rte_panic("Invalid timer source specified\n");
228 * Wait at least us microseconds.
231 * The number of microseconds to wait.
234 rte_delay_us(unsigned us);
237 * Wait at least ms milliseconds.
240 * The number of milliseconds to wait.
243 rte_delay_ms(unsigned ms)
245 rte_delay_us(ms * 1000);
252 #endif /* _RTE_CYCLES_H_ */