/* $OpenBSD: m8820x.c,v 1.19 2025/08/12 16:17:10 miod Exp $ */ /* * Copyright (c) 2004, Miodrag Vallat. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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) 2001 Steve Murphree, Jr. * Copyright (c) 1996 Nivas Madhur * All rights reserved. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Nivas Madhur. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. * */ /* * Mach Operating System * Copyright (c) 1993-1991 Carnegie Mellon University * Copyright (c) 1991 OMRON Corporation * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON AND OMRON ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON AND OMRON DISCLAIM ANY LIABILITY OF ANY KIND * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. */ #include <sys/param.h> #include <sys/systm.h> #include <uvm/uvm_extern.h> #include <machine/asm_macro.h> #include <machine/board.h> #include <machine/cmmu.h> #include <machine/cpu.h> #include <machine/m8820x.h> /* * Probe a pair of CMMU addresses to discover the presence of a CPU slot. */ int m8820x_probe_cmmus(uint32_t icmmu, uint32_t dcmmu) { /* * On the luna88k, badaddr() returns 'good' on unpopulated slots, * so we check the CMMU type value for each CMMU register address. */ int type; volatile uint32_t* icmmuregs = (volatile uint32_t *)icmmu; volatile uint32_t* dcmmuregs = (volatile uint32_t *)dcmmu; type = CMMU_TYPE(icmmuregs[CMMU_IDR]); if (type != M88200_ID && type != M88204_ID) return 0; type = CMMU_TYPE(dcmmuregs[CMMU_IDR]); if (type != M88200_ID && type != M88204_ID) return 0; return 1; } /* * This routine sets up the CPU/CMMU configuration. */ void m8820x_setup_board_config() { u_int pos = 0; if (m8820x_probe_cmmus(CMMU_I0, CMMU_D0) != 0) { m8820x_cmmu[pos].cmmu_regs = (void *)CMMU_I0; m8820x_cmmu[pos].cmmu_next = m8820x_cmmu + pos + 1; pos++; m8820x_cmmu[pos].cmmu_regs = (void *)CMMU_D0; pos++; } if (m8820x_probe_cmmus(CMMU_I1, CMMU_D1) != 0) { m8820x_cmmu[pos].cmmu_regs = (void *)CMMU_I1; m8820x_cmmu[pos].cmmu_next = m8820x_cmmu + pos + 1; pos++; m8820x_cmmu[pos].cmmu_regs = (void *)CMMU_D1; pos++; } if (m8820x_probe_cmmus(CMMU_I2, CMMU_D2) != 0) { m8820x_cmmu[pos].cmmu_regs = (void *)CMMU_I2; m8820x_cmmu[pos].cmmu_next = m8820x_cmmu + pos + 1; pos++; m8820x_cmmu[pos].cmmu_regs = (void *)CMMU_D2; pos++; } if (m8820x_probe_cmmus(CMMU_I3, CMMU_D3) != 0) { m8820x_cmmu[pos].cmmu_regs = (void *)CMMU_I3; m8820x_cmmu[pos].cmmu_next = m8820x_cmmu + pos + 1; pos++; m8820x_cmmu[pos].cmmu_regs = (void *)CMMU_D3; pos++; } ncpusfound = pos >> 1; max_cmmus = pos; cmmu_shift = 1; /* fixed 2:1 configuration */ #ifdef M8820X_DEBUG /* * Now that we know which CMMUs are there, report every association * Note: consinit() is not called yet, we need ROM console here */ for (num = 0; num < ncpusfound; num++) { volatile unsigned *cr; int type; cr = m8820x_cmmu[num << cmmu_shift].cmmu_regs; type = CMMU_TYPE(cr[CMMU_IDR]); printf("CPU%d is associated to %d MC8820%c CMMUs\n", num, 1 << cmmu_shift, type == M88204_ID ? '4' : '0'); } #endif } /* * Find out the CPU number from accessing CMMU * Better be at splhigh, or even better, with interrupts * disabled. */ #define ILLADDRESS 0x3ffffff0 /* faulty address for LUNA-88K{,2} */ cpuid_t m8820x_cpu_number() { u_int cmmu; u_int i; CMMU_LOCK; for (i = 0; i < 10; i++) { /* clear CMMU P-bus status registers */ for (cmmu = 0; cmmu < max_cmmus; cmmu++) { if (CMMU_MODE(cmmu) != INST_CMMU) m8820x_cmmu[cmmu].cmmu_regs[CMMU_PFSR] = 0; } /* access faulting address */ badaddr((vaddr_t)ILLADDRESS, 4); /* check which CMMU is reporting the fault */ for (cmmu = 0; cmmu < max_cmmus; cmmu++) { if (CMMU_MODE(cmmu) != INST_CMMU && CMMU_PFSR_FAULT(m8820x_cmmu[cmmu]. cmmu_regs[CMMU_PFSR]) != CMMU_PFSR_SUCCESS) { /* clean register, just in case... */ m8820x_cmmu[cmmu].cmmu_regs[CMMU_PFSR] = 0; CMMU_UNLOCK; return cmmu >> 1; } } } CMMU_UNLOCK; panic("m8820x_cpu_number: could not determine my cpu number"); }
