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 2023 Oxide Computer Company 14 */ 15 16 #include "payload_common.h" 17 #include "payload_utils.h" 18 #include "test_defs.h" 19 20 #define UINT32_MAX 0xffffffff 21 #define MSR_TSC 0x10 22 23 void 24 start(void) 25 { 26 /* write a value to the TSC */ 27 wrmsr(MSR_TSC, TSC_TARGET_WRVAL); 28 29 /* loop for as long as the host wants */ 30 for (;;) { 31 uint64_t tsc = rdmsr(MSR_TSC); 32 outl(IOP_TEST_VALUE, UINT32_MAX & tsc); 33 outl(IOP_TEST_VALUE, UINT32_MAX & (tsc >> 32)); 34 } 35 } 36