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iodev: Add a spinlock and allow console for secondaries

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Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2021-09-15 23:18:46 +09:00
parent cd59d39686
commit a13a23d5fa
1 changed files with 22 additions and 2 deletions
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24
src/iodev.c
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@ -3,6 +3,7 @@
//#define DEBUG_IODEV
#include "iodev.h"
#include "memory.h"
#include "string.h"
#ifdef DEBUG_IODEV
@ -80,14 +81,31 @@ void iodev_flush(iodev_id_t id)
int in_iodev = 0;
static DECLARE_SPINLOCK(console_lock);
void iodev_console_write(const void *buf, size_t length)
{
if (in_iodev || !is_primary_core()) {
bool do_lock = mmu_active();
if (!do_lock && !is_primary_core()) {
if (length) {
iodev_write(IODEV_UART, "*", 1);
iodev_write(IODEV_UART, buf, length);
return;
}
return;
}
if (do_lock)
spin_lock(&console_lock);
if (in_iodev) {
if (length) {
iodev_write(IODEV_UART, "*", 1);
iodev_write(IODEV_UART, buf, length);
}
if (do_lock)
spin_unlock(&console_lock);
return;
}
in_iodev++;
@ -159,6 +177,8 @@ void iodev_console_write(const void *buf, size_t length)
}
in_iodev--;
if (do_lock)
spin_unlock(&console_lock);
}
void iodev_handle_events(iodev_id_t id)