1/* $NetBSD: cpu.h,v 1.25 2024/02/28 13:05:39 thorpej Exp $ */ 2 3/* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1982, 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: Utah $Hdr: cpu.h 1.16 91/03/25$ 37 * 38 * @(#)cpu.h 8.4 (Berkeley) 1/5/94 39 */ 40 41#ifndef _M68K_CPU_H_ 42#define _M68K_CPU_H_ 43 44#if defined(_KERNEL_OPT) 45#include "opt_m68k_arch.h" /* XXX Should not do this here. */ 46#endif 47 48/* 49 * Exported definitions common to Motorola m68k-based ports. 50 */ 51 52/* 53 * XXX The remaining contents of this file should be split out 54 * XXX into separate files (like m68k.h) and then this file 55 * XXX should go away. Furthermore, most of the stuff defined 56 * XXX here does NOT belong in <machine/cpu.h>, and the ports 57 * XXX using this file should remove <m68k/cpu.h> from there. 58 */ 59 60#include <m68k/m68k.h> 61 62/* XXX - Move this stuff into <m68k/cacr.h> maybe? */ 63 64/* fields in the 68020 cache control register */ 65#define IC_ENABLE 0x0001 /* enable instruction cache */ 66#define IC_FREEZE 0x0002 /* freeze instruction cache */ 67#define IC_CE 0x0004 /* clear instruction cache entry */ 68#define IC_CLR 0x0008 /* clear entire instruction cache */ 69 70/* additional fields in the 68030 cache control register */ 71#define IC_BE 0x0010 /* instruction burst enable */ 72#define DC_ENABLE 0x0100 /* data cache enable */ 73#define DC_FREEZE 0x0200 /* data cache freeze */ 74#define DC_CE 0x0400 /* clear data cache entry */ 75#define DC_CLR 0x0800 /* clear entire data cache */ 76#define DC_BE 0x1000 /* data burst enable */ 77#define DC_WA 0x2000 /* write allocate */ 78 79/* fields in the 68040 cache control register */ 80#define IC40_ENABLE 0x00008000 /* instruction cache enable bit */ 81#define DC40_ENABLE 0x80000000 /* data cache enable bit */ 82 83/* additional fields in the 68060 cache control register */ 84#define DC60_NAD 0x40000000 /* no allocate mode, data cache */ 85#define DC60_ESB 0x20000000 /* enable store buffer */ 86#define DC60_DPI 0x10000000 /* disable CPUSH invalidation */ 87#define DC60_FOC 0x08000000 /* four kB data cache mode (else 8) */ 88 89#define IC60_EBC 0x00800000 /* enable branch cache */ 90#define IC60_CABC 0x00400000 /* clear all branch cache entries */ 91#define IC60_CUBC 0x00200000 /* clear user branch cache entries */ 92 93#define IC60_NAI 0x00004000 /* no allocate mode, instr. cache */ 94#define IC60_FIC 0x00002000 /* four kB instr. cache (else 8) */ 95 96#define CACHE_ON (DC_WA|DC_BE|DC_CLR|DC_ENABLE|IC_BE|IC_CLR|IC_ENABLE) 97#define CACHE_OFF (DC_CLR|IC_CLR) 98#define CACHE_CLR (CACHE_ON) 99#define IC_CLEAR (DC_WA|DC_BE|DC_ENABLE|IC_BE|IC_CLR|IC_ENABLE) 100#define DC_CLEAR (DC_WA|DC_BE|DC_CLR|DC_ENABLE|IC_BE|IC_ENABLE) 101 102#define CACHE40_ON (IC40_ENABLE|DC40_ENABLE) 103#define CACHE40_OFF (0x00000000) 104 105#define CACHE60_ON (CACHE40_ON|IC60_CABC|IC60_EBC|DC60_ESB) 106#define CACHE60_OFF (CACHE40_OFF|IC60_CABC) 107 108#define CACHELINE_SIZE 16 109#define CACHELINE_MASK (CACHELINE_SIZE - 1) 110 111/* CTL_MACHDEP definitions. (Common to all m68k ports.) */ 112#define CPU_CONSDEV 1 /* dev_t: console terminal device */ 113#define CPU_ROOT_DEVICE 2 /* string: root device name */ 114#define CPU_BOOTED_KERNEL 3 /* string: booted kernel name */ 115 116#if defined(_KERNEL) || defined(_KMEMUSER) 117#include <sys/cpu_data.h> 118 119struct cpu_info { 120 struct cpu_data ci_data; /* MI per-cpu data */ 121 cpuid_t ci_cpuid; 122 int ci_mtx_count; 123 int ci_mtx_oldspl; 124 volatile int ci_want_resched; 125 volatile int ci_idepth; 126 struct lwp *ci_onproc; /* current user LWP / kthread */ 127}; 128#endif /* _KERNEL || _KMEMUSER */ 129 130#ifdef _KERNEL 131extern struct cpu_info cpu_info_store; 132 133struct proc; 134void cpu_proc_fork(struct proc *, struct proc *); 135 136#define curcpu() (&cpu_info_store) 137 138/* 139 * definitions of cpu-dependent requirements 140 * referenced in generic code 141 */ 142#define cpu_number() 0 143 144#define LWP_PC(l) (((struct trapframe *)((l)->l_md.md_regs))->tf_pc) 145 146/* 147 * Arguments to hardclock and gatherstats encapsulate the previous 148 * machine state in an opaque clockframe. On the m68k platforms, we use 149 * what the interrupt stub puts on the stack before calling C code. 150 */ 151struct clockframe { 152 /* regs saved on the stack by the interrupt stub */ 153 u_int cf_regs[4]; /* d0,d1,a0,a1 */ 154 /* hardware frame */ 155 u_short cf_sr; /* sr at time of interrupt */ 156 u_long cf_pc; /* pc at time of interrupt */ 157 u_short cf_vo; /* vector offset (4-word HW frame) */ 158} __attribute__((__packed__)); 159 160#define CLKF_USERMODE(framep) (((framep)->cf_sr & PSL_S) == 0) 161#define CLKF_PC(framep) ((framep)->cf_pc) 162 163#if 0 164/* 165 * We can determine if we were previously in an interrupt context 166 * if we were running on the interrupt stack (as opposed to the 167 * "master" stack). 168 * 169 * XXX Actually, we can't, because we don't use the master stack 170 * XXX right now. 171 * 172 * (Actually, it's unlikely that we'll ever use the master stack in NetBSD. 173 * It would complicate the spl*() functions considerably and it just doesn't 174 * seem like a good trade-off for what seems like extremely marginal gains. 175 * So, just blissfully run the kernel on the interrupt stack all the time, 176 * and it's been that way for >30 years and no one has really complained 177 * about it.) 178 */ 179#define CLKF_INTR(framep) (((framep)->cf_sr & PSL_M) == 0) 180#else 181/* 182 * The clock interrupt handler can determine if it's a nested 183 * interrupt by checking for intr_depth > 1. 184 * (Remember, the clock interrupt handler itself will cause the 185 * depth counter to be incremented). 186 */ 187extern volatile unsigned int intr_depth; 188#define CLKF_INTR(framep) (intr_depth > 1) 189#endif 190 191#ifndef __HAVE_M68K_HW_AST 192#define cpu_set_hw_ast(l) __nothing 193#endif 194 195extern volatile int astpending; 196#define cpu_set_ast(l) \ 197 do { \ 198 __USE(l); astpending = 1; cpu_set_hw_ast(l); \ 199 } while (/*CONSTCOND*/0) 200 201/* 202 * Preempt the current process if in interrupt from user mode, 203 * or after the current trap/syscall if in system mode. 204 */ 205#define cpu_need_resched(ci, l, flags) \ 206 do { \ 207 __USE(ci); __USE(flags); cpu_set_ast(l); \ 208 } while (/*CONSTCOND*/0) 209 210/* 211 * Give a profiling tick to the current process when the user profiling 212 * buffer pages are invalid. On m68k, request an ast to send us through 213 * trap, marking the proc as needing a profiling tick. 214 */ 215#define cpu_need_proftick(l) \ 216 do { \ 217 (l)->l_pflag |= LP_OWEUPC; cpu_set_ast(l); \ 218 } while (/*CONSTCOND*/0) 219 220/* 221 * Notify the current process (p) that it has a signal pending, 222 * process as soon as possible. 223 */ 224#define cpu_signotify(l) cpu_set_ast(l) 225 226#endif /* _KERNEL */ 227 228#endif /* _M68K_CPU_H_ */ 229