/* $OpenBSD: locore.S,v 1.18 1998/09/15 10:58:53 pefo Exp $ */ /*- * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Digital Equipment Corporation and Ralph Campbell. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Copyright (C) 1989 Digital Equipment Corporation. * Permission to use, copy, modify, and distribute this software and * its documentation for any purpose and without fee is hereby granted, * provided that the above copyright notice appears in all copies. * Digital Equipment Corporation makes no representations about the * suitability of this software for any purpose. It is provided "as is" * without express or implied warranty. * * from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/loMem.s, * v 1.1 89/07/11 17:55:04 nelson Exp SPRITE (DECWRL) * from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/machAsm.s, * v 9.2 90/01/29 18:00:39 shirriff Exp SPRITE (DECWRL) * from: Header: /sprite/src/kernel/vm/ds3100.md/vmPmaxAsm.s, * v 1.1 89/07/10 14:27:41 nelson Exp SPRITE (DECWRL) * * from: @(#)locore.s 8.5 (Berkeley) 1/4/94 * JNPR: locore.S,v 1.6.2.1 2007/08/29 12:24:49 girish * $FreeBSD$ */ /* * FREEBSD_DEVELOPERS_FIXME * The start routine below was written for a multi-core CPU * with each core being hyperthreaded. This serves as an example * for a complex CPU architecture. For a different CPU complex * please make necessary changes to read CPU-ID etc. * A clean solution would be to have a different locore file for * each CPU type. */ /* * Contains code that is the first executed at boot time plus * assembly language support routines. */ #include #include #include #include #include "assym.s" .data #ifdef YAMON GLOBAL(fenvp) .space 4 # Assumes mips32? Is that OK? #endif .set noreorder .text GLOBAL(btext) ASM_ENTRY(_start) VECTOR(_locore, unknown) /* UNSAFE TO USE a0..a3, need to preserve the args from boot loader */ mtc0 zero, MIPS_COP_0_CAUSE # Clear soft interrupts #if defined(CPU_CNMIPS) /* * t1: Bits to set explicitly: * Enable FPU */ /* Set these bits */ li t1, (MIPS_SR_COP_0_BIT | MIPS_SR_PX | MIPS_SR_KX | MIPS_SR_UX | MIPS_SR_SX | MIPS_SR_BEV) /* Reset these bits */ li t0, ~(MIPS_SR_DE | MIPS_SR_SR | MIPS_SR_ERL | MIPS_SR_EXL | MIPS_SR_INT_IE | MIPS_SR_COP_2_BIT) #elif defined (CPU_RMI) || defined (CPU_NLM) /* Set these bits */ li t1, (MIPS_SR_COP_2_BIT | MIPS_SR_COP_0_BIT | MIPS_SR_KX | MIPS_SR_UX) /* Reset these bits */ li t0, ~(MIPS_SR_BEV | MIPS_SR_SR | MIPS_SR_INT_IE) #else /* * t0: Bits to preserve if set: * Soft reset * Boot exception vectors (firmware-provided) */ li t0, (MIPS_SR_BEV | MIPS_SR_SR) /* * t1: Bits to set explicitly: * Enable FPU */ li t1, MIPS_SR_COP_1_BIT #ifdef __mips_n64 or t1, MIPS_SR_KX | MIPS_SR_SX | MIPS_SR_UX #endif #endif /* * Read coprocessor 0 status register, clear bits not * preserved (namely, clearing interrupt bits), and set * bits we want to explicitly set. */ mfc0 t2, MIPS_COP_0_STATUS and t2, t0 or t2, t1 mtc0 t2, MIPS_COP_0_STATUS COP0_SYNC /* Make sure KSEG0 is cached */ li t0, MIPS_CCA_CACHED mtc0 t0, MIPS_COP_0_CONFIG COP0_SYNC /*xxximp * now that we pass a0...a3 to the platform_init routine, do we need * to stash this stuff here? */ #ifdef YAMON /* Save YAMON boot environment pointer */ sw a2, _C_LABEL(fenvp) #endif #if defined(CPU_CNMIPS) && defined(SMP) .set push .set mips32r2 rdhwr t2, $0 beqz t2, 1f nop j octeon_ap_wait nop .set pop 1: #endif /* * Initialize stack and call machine startup. */ PTR_LA sp, _C_LABEL(pcpu_space) PTR_ADDU sp, (PAGE_SIZE * 2) - CALLFRAME_SIZ REG_S zero, CALLFRAME_RA(sp) # Zero out old ra for debugger REG_S zero, CALLFRAME_SP(sp) # Zero out old fp for debugger PTR_LA gp, _C_LABEL(_gp) /* Call the platform-specific startup code. */ jal _C_LABEL(platform_start) nop PTR_LA sp, _C_LABEL(thread0) PTR_L a0, TD_PCB(sp) REG_LI t0, ~7 and a0, a0, t0 PTR_SUBU sp, a0, CALLFRAME_SIZ jal _C_LABEL(mi_startup) # mi_startup(frame) sw zero, CALLFRAME_SIZ - 8(sp) # Zero out old fp for debugger PANIC("Startup failed!") VECTOR_END(_locore)