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Fix broken uart on Win2016 guest.
Obtained from: Joyent (commit/2bf1a940afbd1382faff159e7c93c72779ca10f4) MFC after: 3 weeks.
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=343077
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@ -431,6 +431,13 @@ uart_write(struct uart_softc *sc, int offset, uint8_t value)
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sc->thre_int_pending = true;
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break;
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case REG_IER:
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/* Assert an interrupt if re-enabling the THRE intr, since we
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* always report THRE as active in the status register.
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*/
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if ((sc->ier & IER_ETXRDY) == 0 &&
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(value & IER_ETXRDY) != 0) {
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sc->thre_int_pending = true;
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}
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/*
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* Apply mask so that bits 4-7 are 0
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* Also enables bits 0-3 only if they're 1
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