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io.h: read/write[bwl] should use barrier

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Add barrier() calls to low-level read/write io calls so that their
callers don't need to.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2017-01-23 11:13:19 -05:00
parent 9c1bf1387c
commit 5beceaae5c
3 changed files with 13 additions and 9 deletions
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3
src/avr/serial.c
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@@ -126,12 +126,10 @@ console_get_output(uint8_t len)
return NULL;
// Disable TX irq and move buffer
writeb(&transmit_max, 0);
barrier();
tpos = readb(&transmit_pos);
tmax -= tpos;
memmove(&transmit_buf[0], &transmit_buf[tpos], tmax);
writeb(&transmit_pos, 0);
barrier();
writeb(&transmit_max, tmax);
enable_tx_irq();
return &transmit_buf[tmax];
@@ -141,7 +139,6 @@ console_get_output(uint8_t len)
void
console_push_output(uint8_t len)
{
barrier();
writeb(&transmit_max, readb(&transmit_max) + len);
enable_tx_irq();
}