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pru: Perform message encoding on pru0 to free space on pru1

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Copy the parameters of calls to console_sendf() on pru1 to pru0 and
then call that function on pru0.  Although copying the parameters is a
"hack", the code size reduction is notable.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2021-05-03 00:15:49 -04:00
parent 5c10001bc5
commit 92e1481a52
3 changed files with 66 additions and 37 deletions
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25
src/pru/main.c
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@@ -1,6 +1,6 @@
// Main starting point for PRU code.
//
// Copyright (C) 2017 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2017-2021 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
@@ -78,6 +78,8 @@ timer_kick(void)
CT_INTC.SECR0 = 1 << IEP_EVENT;
}
static uint32_t in_timer_dispatch;
static void
_irq_poll(void)
{
@@ -88,9 +90,11 @@ _irq_poll(void)
}
if (secr0 & (1 << IEP_EVENT)) {
CT_IEP.TMR_CMP_STS = 0xff;
in_timer_dispatch = 1;
uint32_t next = timer_dispatch_many();
timer_set(next);
CT_INTC.SECR0 = 1 << IEP_EVENT;
in_timer_dispatch = 0;
}
}
void __attribute__((optimize("O2")))
@@ -141,26 +145,23 @@ DECL_TASK(console_task);
void
console_sendf(const struct command_encoder *ce, va_list args)
{
// Verify space for message
uint32_t send_push_pos = SHARED_MEM->send_push_pos;
struct shared_response_buffer *s = &SHARED_MEM->send_data[send_push_pos];
if (readl(&s->count))
return;
// Generate message
uint32_t msglen = command_encodef(s->data, ce, args);
SHARED_MEM->next_encoder_args = args;
writel(&SHARED_MEM->next_encoder, (uint32_t)ce);
// Signal PRU0 to transmit message
writel(&s->count, msglen);
write_r31(R31_WRITE_IRQ_SELECT | (KICK_PRU0_EVENT - R31_WRITE_IRQ_OFFSET));
SHARED_MEM->send_push_pos = (
(send_push_pos + 1) % ARRAY_SIZE(SHARED_MEM->send_data));
uint32_t itd = in_timer_dispatch;
while (readl(&SHARED_MEM->next_encoder))
if (!itd)
irq_poll();
}
void
console_shutdown(void)
{
writel(&SHARED_MEM->next_command, 0);
writel(&SHARED_MEM->next_encoder, 0);
in_timer_dispatch = 0;
}
DECL_SHUTDOWN(console_shutdown);