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 * $FreeBSD$ 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/psl.h> 47 #include <machine/frame.h> 48 #include <machine/segments.h> 49 50 /* 51 * definitions of cpu-dependent requirements 52 * referenced in generic code 53 */ 54 #undef COPY_SIGCODE /* don't copy sigcode above user stack in exec */ 55 56 #define cpu_exec(p) /* nothing */ 57 #define cpu_swapin(p) /* nothing */ 58 #define cpu_setstack(p, ap) ((p)->p_md.md_regs[SP] = (ap)) 59 60 #define CLKF_USERMODE(framep) \ 61 ((ISPL((framep)->cf_cs) == SEL_UPL) || (framep->cf_eflags & PSL_VM)) 62 63 #define CLKF_INTR(framep) (intr_nesting_level >= 2) 64 #if 0 65 /* 66 * XXX splsoftclock() is very broken and barely worth fixing. It doesn't 67 * turn off the clock bit in imen or in the icu. (This is not a serious 68 * problem at 100 Hz but it is serious at 16000 Hz for pcaudio. softclock() 69 * can take more than 62.5 usec so clock interrupts are lost.) It doesn't 70 * check for pending interrupts being unmasked. clkintr() and Xintr0() 71 * assume that the ipl is high when hardclock() returns. Our SWI_CLOCK 72 * handling is efficient enough that little is gained by calling 73 * softclock() directly. 74 */ 75 #define CLKF_BASEPRI(framep) ((framep)->cf_ppl == 0) 76 #else 77 #define CLKF_BASEPRI(framep) (0) 78 #endif 79 #define CLKF_PC(framep) ((framep)->cf_eip) 80 81 /* 82 * Preempt the current process if in interrupt from user mode, 83 * or after the current trap/syscall if in system mode. 84 * 85 * XXX: if astpending is later changed to an |= here due to more flags being 86 * added, we will have an atomicy problem. The type of atomicy we need is 87 * a non-locked orl. 88 */ 89 #define need_resched() do { astpending = AST_RESCHED|AST_PENDING; } while (0) 90 #define resched_wanted() (astpending & AST_RESCHED) 91 92 /* 93 * Arrange to handle pending profiling ticks before returning to user mode. 94 * 95 * XXX this is now poorly named and implemented. It used to handle only a 96 * single tick and the P_OWEUPC flag served as a counter. Now there is a 97 * counter in the proc table and flag isn't really necessary. 98 */ 99 #define need_proftick(p) \ 100 do { (p)->p_flag |= P_OWEUPC; aston(); } while (0) 101 102 /* 103 * Notify the current process (p) that it has a signal pending, 104 * process as soon as possible. 105 * 106 * XXX: aston() really needs to be an atomic (not locked, but an orl), 107 * in case need_resched() is set by an interrupt. But with astpending a 108 * per-cpu variable this is not trivial to do efficiently. For now we blow 109 * it off (asynchronous need_resched() conflicts are not critical). 110 */ 111 #define signotify(p) aston() 112 113 #define aston() do { astpending |= AST_PENDING; } while (0) 114 #define astoff() 115 116 /* 117 * CTL_MACHDEP definitions. 118 */ 119 #define CPU_CONSDEV 1 /* dev_t: console terminal device */ 120 #define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */ 121 #define CPU_DISRTCSET 3 /* int: disable resettodr() call */ 122 #define CPU_BOOTINFO 4 /* struct: bootinfo */ 123 #define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */ 124 #define CPU_MAXID 6 /* number of valid machdep ids */ 125 126 #define CTL_MACHDEP_NAMES { \ 127 { 0, 0 }, \ 128 { "console_device", CTLTYPE_STRUCT }, \ 129 { "adjkerntz", CTLTYPE_INT }, \ 130 { "disable_rtc_set", CTLTYPE_INT }, \ 131 { "bootinfo", CTLTYPE_STRUCT }, \ 132 { "wall_cmos_clock", CTLTYPE_INT }, \ 133 } 134 135 #ifdef _KERNEL 136 extern char btext[]; 137 extern char etext[]; 138 extern u_char intr_nesting_level; 139 140 void fork_trampoline __P((void)); 141 void fork_return __P((struct proc *, struct trapframe)); 142 #endif 143 144 #endif /* !_MACHINE_CPU_H_ */ 145