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 #define cpu_set_init_frame(p, fp) ((p)->p_md.md_regs = (fp)) 60 61 #define CLKF_USERMODE(framep) \ 62 ((ISPL((framep)->cf_cs) == SEL_UPL) || (framep->cf_eflags & PSL_VM)) 63 64 #define CLKF_INTR(framep) (intr_nesting_level >= 2) 65 #if 0 66 /* 67 * XXX splsoftclock() is very broken and barely worth fixing. It doesn't 68 * turn off the clock bit in imen or in the icu. (This is not a serious 69 * problem at 100 Hz but it is serious at 16000 Hz for pcaudio. softclock() 70 * can take more than 62.5 usec so clock interrupts are lost.) It doesn't 71 * check for pending interrupts being unmasked. clkintr() and Xintr0() 72 * assume that the ipl is high when hardclock() returns. Our SWI_CLOCK 73 * handling is efficient enough that little is gained by calling 74 * softclock() directly. 75 */ 76 #define CLKF_BASEPRI(framep) ((framep)->cf_ppl == 0) 77 #else 78 #define CLKF_BASEPRI(framep) (0) 79 #endif 80 #define CLKF_PC(framep) ((framep)->cf_eip) 81 82 /* 83 * Preempt the current process if in interrupt from user mode, 84 * or after the current trap/syscall if in system mode. 85 * 86 * XXX: if astpending is later changed to an |= here due to more flags being 87 * added, we will have an atomicy problem. The type of atomicy we need is 88 * a non-locked orl. 89 */ 90 #define need_resched() do { astpending = AST_RESCHED|AST_PENDING; } while (0) 91 #define resched_wanted() (astpending & AST_RESCHED) 92 93 /* 94 * Arrange to handle pending profiling ticks before returning to user mode. 95 * 96 * XXX this is now poorly named and implemented. It used to handle only a 97 * single tick and the P_OWEUPC flag served as a counter. Now there is a 98 * counter in the proc table and flag isn't really necessary. 99 */ 100 #define need_proftick(p) \ 101 do { (p)->p_flag |= P_OWEUPC; aston(); } while (0) 102 103 /* 104 * Notify the current process (p) that it has a signal pending, 105 * process as soon as possible. 106 * 107 * XXX: aston() really needs to be an atomic (not locked, but an orl), 108 * in case need_resched() is set by an interrupt. But with astpending a 109 * per-cpu variable this is not trivial to do efficiently. For now we blow 110 * it off (asynchronous need_resched() conflicts are not critical). 111 */ 112 #define signotify(p) aston() 113 114 #define aston() do { astpending |= AST_PENDING; } while (0) 115 #define astoff() 116 117 /* 118 * CTL_MACHDEP definitions. 119 */ 120 #define CPU_CONSDEV 1 /* dev_t: console terminal device */ 121 #define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */ 122 #define CPU_DISRTCSET 3 /* int: disable resettodr() call */ 123 #define CPU_BOOTINFO 4 /* struct: bootinfo */ 124 #define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */ 125 #define CPU_MAXID 6 /* number of valid machdep ids */ 126 127 #define CTL_MACHDEP_NAMES { \ 128 { 0, 0 }, \ 129 { "console_device", CTLTYPE_STRUCT }, \ 130 { "adjkerntz", CTLTYPE_INT }, \ 131 { "disable_rtc_set", CTLTYPE_INT }, \ 132 { "bootinfo", CTLTYPE_STRUCT }, \ 133 { "wall_cmos_clock", CTLTYPE_INT }, \ 134 } 135 136 #ifdef _KERNEL 137 extern char btext[]; 138 extern char etext[]; 139 extern u_char intr_nesting_level; 140 141 void fork_trampoline __P((void)); 142 void fork_return __P((struct proc *, struct trapframe)); 143 #endif 144 145 #endif /* !_MACHINE_CPU_H_ */ 146