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Fix delay() function in the BERI loader code.
Reviewed by: brooks @ Sponsored by: DARPA, AFRL
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=266885
@ -215,13 +215,25 @@ time(time_t *tloc)
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}
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/*
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* Delay - presumably in usecs?
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* Delay - in usecs
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*
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* NOTE: We are assuming that the CPU is running at 100MHz.
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*/
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void
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delay(int usecs)
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{
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register_t t;
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uint32_t delta;
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uint32_t curr;
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uint32_t last;
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t = cp0_count_get() + usecs * 100;
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while (cp0_count_get() < t);
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last = cp0_count_get();
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while (usecs > 0) {
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curr = cp0_count_get();
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delta = curr - last;
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while (usecs > 0 && delta >= 100) {
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usecs--;
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last += 100;
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delta -= 100;
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}
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}
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}
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