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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2022 Oxide Computer Company
*/
#include "payload_common.h"
#include "payload_utils.h"
#include "test_defs.h"
#define HPET_OFF_CONFIG 0x10
#define HPET_OFF_MAIN_COUNT_LOW 0xf0
#define HPET_CONFIG_ENABLE 1
static void
write_hpet(uint_t reg, uint32_t value)
{
volatile uint32_t *ptr = (uint32_t *)(MMIO_HPET_BASE + reg);
*ptr = value;
}
static uint32_t
read_hpet_main_low(void)
{
volatile uint32_t *ptr =
(uint32_t *)(MMIO_HPET_BASE + HPET_OFF_MAIN_COUNT_LOW);
return (*ptr);
}
void
start(void)
{
write_hpet(HPET_OFF_CONFIG, HPET_CONFIG_ENABLE);
/* loop for as long as the host wants */
for (;;) {
uint32_t start, end;
start = read_hpet_main_low();
outl(IOP_TEST_VALUE, start);
do {
end = read_hpet_main_low();
/* wait for enough ticks to pass */
} while (end < (start + HPET_TARGET_TICKS));
outl(IOP_TEST_VALUE, end);
}
}
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