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libubb/swuart.c: use mlockall to prevent page faults with interrupts off
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@ -12,7 +12,9 @@
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <ubb/ubb.h>
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#include <ubb/regs4740.h>
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@ -232,6 +234,15 @@ void swuart_clear_errors(void)
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int swuart_open(uint32_t tx, uint32_t rx, int bps)
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{
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/*
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* Make sure code and rx/tx buffers are locked into memory before we
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* disable interrupts in swuart_trx.
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*/
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if (mlockall(MCL_CURRENT | MCL_FUTURE)) {
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perror("mlockall");
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return -1;
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}
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ticks = TCLK/bps-1;
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tx_mask = tx;
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rx_mask = rx;
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@ -247,4 +258,6 @@ int swuart_open(uint32_t tx, uint32_t rx, int bps)
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void swuart_close(void)
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{
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if (munlockall())
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perror("munlockall");
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}
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