1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. 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: @(#)cpu.h 5.4 (Berkeley) 5/9/91 37 * $Id: cpu.h,v 1.28 1997/02/22 09:34:04 peter Exp $ 38 */ 39 40 #ifndef _MACHINE_CPU_H_ 41 #define _MACHINE_CPU_H_ 42 43 /* 44 * Definitions unique to i386 cpu support. 45 */ 46 #include <machine/frame.h> 47 #include <machine/segments.h> 48 49 /* 50 * definitions of cpu-dependent requirements 51 * referenced in generic code 52 */ 53 #undef COPY_SIGCODE /* don't copy sigcode above user stack in exec */ 54 55 #define cpu_exec(p) /* nothing */ 56 #define cpu_swapin(p) /* nothing */ 57 #define cpu_setstack(p, ap) ((p)->p_md.md_regs[SP] = (ap)) 58 #define cpu_set_init_frame(p, fp) ((p)->p_md.md_regs = (fp)) 59 60 #define CLKF_USERMODE(framep) (ISPL((framep)->cf_cs) == SEL_UPL) 61 #define CLKF_INTR(framep) (intr_nesting_level >= 2) 62 #if 0 63 /* 64 * XXX splsoftclock() is very broken and barely worth fixing. It doesn't 65 * turn off the clock bit in imen or in the icu. (This is not a serious 66 * problem at 100 Hz but it is serious at 16000 Hz for pcaudio. softclock() 67 * can take more than 62.5 usec so clock interrupts are lost.) It doesn't 68 * check for pending interrupts being unmasked. clkintr() and Xintr0() 69 * assume that the ipl is high when hardclock() returns. Our SWI_AST 70 * handling is efficient enough that little is gained by calling 71 * softclock() directly. 72 */ 73 #define CLKF_BASEPRI(framep) (((framep)->cf_ppl & ~SWI_AST_MASK) == 0) 74 #else 75 #define CLKF_BASEPRI(framep) (0) 76 #endif 77 #define CLKF_PC(framep) ((framep)->cf_eip) 78 79 /* 80 * Preempt the current process if in interrupt from user mode, 81 * or after the current trap/syscall if in system mode. 82 */ 83 #define need_resched() { want_resched = 1; aston(); } 84 85 /* 86 * Arrange to handle pending profiling ticks before returning to user mode. 87 * 88 * XXX this is now poorly named and implemented. It used to handle only a 89 * single tick and the P_OWEUPC flag served as a counter. Now there is a 90 * counter in the proc table and flag isn't really necessary. 91 */ 92 #define need_proftick(p) { (p)->p_flag |= P_OWEUPC; aston(); } 93 94 /* 95 * Notify the current process (p) that it has a signal pending, 96 * process as soon as possible. 97 */ 98 #define signotify(p) aston() 99 100 #define aston() setsoftast() 101 #define astoff() 102 103 /* 104 * pull in #defines for kinds of processors 105 */ 106 #include <machine/cputypes.h> 107 108 struct cpu_nameclass { 109 char *cpu_name; 110 int cpu_class; 111 }; 112 113 /* 114 * CTL_MACHDEP definitions. 115 */ 116 #define CPU_CONSDEV 1 /* dev_t: console terminal device */ 117 #define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */ 118 #define CPU_DISRTCSET 3 /* int: disable resettodr() call */ 119 #define CPU_BOOTINFO 4 /* struct: bootinfo */ 120 #define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */ 121 #define CPU_MAXID 6 /* number of valid machdep ids */ 122 123 #define CTL_MACHDEP_NAMES { \ 124 { 0, 0 }, \ 125 { "console_device", CTLTYPE_STRUCT }, \ 126 { "adjkerntz", CTLTYPE_INT }, \ 127 { "disable_rtc_set", CTLTYPE_INT }, \ 128 { "bootinfo", CTLTYPE_STRUCT }, \ 129 { "wall_cmos_clock", CTLTYPE_INT }, \ 130 } 131 132 #ifdef KERNEL 133 extern int cpu; 134 extern int cpu_class; 135 extern u_char intr_nesting_level; 136 extern int want_resched; /* resched was called */ 137 138 void fork_trampoline __P((void)); 139 void fork_return __P((struct proc *, struct trapframe)); 140 void cpu_set_fork_handler __P((struct proc *, void (*pc)(void *), void *)); 141 #endif 142 143 #endif /* !_MACHINE_CPU_H_ */ 144