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libubb/swuart.c: use mlockall to prevent page faults with interrupts off

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This commit is contained in:
Werner Almesberger 2012-12-28 22:55:06 -03:00
parent 5487578ee7
commit e4f8b97e36
1 changed files with 13 additions and 0 deletions
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13
libubb/swuart.c
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@ -12,7 +12,9 @@
#include <stdbool.h> #include <stdbool.h>
#include <stdio.h>
#include <string.h> #include <string.h>
#include <sys/mman.h>
#include <ubb/ubb.h> #include <ubb/ubb.h>
#include <ubb/regs4740.h> #include <ubb/regs4740.h>
@ -232,6 +234,15 @@ void swuart_clear_errors(void)
int swuart_open(uint32_t tx, uint32_t rx, int bps) int swuart_open(uint32_t tx, uint32_t rx, int bps)
{ {
/*
* Make sure code and rx/tx buffers are locked into memory before we
* disable interrupts in swuart_trx.
*/
if (mlockall(MCL_CURRENT | MCL_FUTURE)) {
perror("mlockall");
return -1;
}
ticks = TCLK/bps-1; ticks = TCLK/bps-1;
tx_mask = tx; tx_mask = tx;
rx_mask = rx; rx_mask = rx;
@ -247,4 +258,6 @@ int swuart_open(uint32_t tx, uint32_t rx, int bps)
void swuart_close(void) void swuart_close(void)
{ {
if (munlockall())
perror("munlockall");
} }