1/*- 2 * Copyright (c) 2009 Neelkanth Natu 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: releng/10.2/sys/mips/sibyte/sb_asm.S 205675 2010-03-26 07:15:27Z neel $ 27 */ 28 29#include <machine/asm.h> 30#include <machine/cpuregs.h> 31 32.set mips64 33.set noat 34.set noreorder 35 36#ifdef SMP 37/* 38 * This function must be implemented in assembly because it is called early 39 * in AP boot without a valid stack. 40 * 41 * This cpu number is available in bits 25 to 27 of the coprocessor 0 PRID 42 * register. This is not documented in the BCM1250 user manual but can be 43 * gleaned from the CFE source code - see sb1250_altcpu.S 44 */ 45LEAF(platform_processor_id) 46 mfc0 v0, MIPS_COP_0_PRID 47 srl v0, v0, 25 48 jr ra 49 and v0, v0, 7 50END(platform_processor_id) 51#endif /* SMP */ 52