1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright 2022 Oxide Computer Company 14 */ 15 16 #include "payload_common.h" 17 #include "payload_utils.h" 18 #include "test_defs.h" 19 20 #define HPET_OFF_CONFIG 0x10 21 #define HPET_OFF_MAIN_COUNT_LOW 0xf0 22 23 #define HPET_CONFIG_ENABLE 1 24 25 26 static void 27 write_hpet(uint_t reg, uint32_t value) 28 { 29 volatile uint32_t *ptr = (uint32_t *)(MMIO_HPET_BASE + reg); 30 *ptr = value; 31 } 32 33 static uint32_t 34 read_hpet_main_low(void) 35 { 36 volatile uint32_t *ptr = 37 (uint32_t *)(MMIO_HPET_BASE + HPET_OFF_MAIN_COUNT_LOW); 38 return (*ptr); 39 } 40 41 42 void 43 start(void) 44 { 45 write_hpet(HPET_OFF_CONFIG, HPET_CONFIG_ENABLE); 46 47 /* loop for as long as the host wants */ 48 for (;;) { 49 uint32_t start, end; 50 51 start = read_hpet_main_low(); 52 outl(IOP_TEST_VALUE, start); 53 54 do { 55 end = read_hpet_main_low(); 56 /* wait for enough ticks to pass */ 57 } while (end < (start + HPET_TARGET_TICKS)); 58 outl(IOP_TEST_VALUE, end); 59 } 60 } 61