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 * %sccs.include.redist.c% 9 * 10 * @(#)cpu.h 5.4 (Berkeley) 05/09/91 11 */ 12 13 /* 14 * Definitions unique to i386 cpu support. 15 */ 16 #include "machine/frame.h" 17 #include "machine/segments.h" 18 19 /* 20 * definitions of cpu-dependent requirements 21 * referenced in generic code 22 */ 23 #undef COPY_SIGCODE /* don't copy sigcode above user stack in exec */ 24 25 /* 26 * function vs. inline configuration; 27 * these are defined to get generic functions 28 * rather than inline or machine-dependent implementations 29 */ 30 #define NEED_MINMAX /* need {,i,l,ul}{min,max} functions */ 31 #define NEED_FFS /* need ffs function */ 32 #define NEED_BCMP /* need bcmp function */ 33 #define NEED_STRLEN /* need strlen function */ 34 35 #define cpu_exec(p) /* nothing */ 36 37 /* 38 * Arguments to hardclock, softclock and gatherstats 39 * encapsulate the previous machine state in an opaque 40 * clockframe; for now, use generic intrframe. 41 */ 42 typedef struct intrframe clockframe; 43 44 #define CLKF_USERMODE(framep) (ISPL((framep)->if_cs) == SEL_UPL) 45 #define CLKF_BASEPRI(framep) ((framep)->if_ppl == 0) 46 #define CLKF_PC(framep) ((framep)->if_eip) 47 48 #define resettodr() /* no todr to set */ 49 50 /* 51 * Preempt the current process if in interrupt from user mode, 52 * or after the current trap/syscall if in system mode. 53 */ 54 #define need_resched() { want_resched++; aston(); } 55 56 /* 57 * Give a profiling tick to the current process from the softclock 58 * interrupt. On tahoe, request an ast to send us through trap(), 59 * marking the proc as needing a profiling tick. 60 */ 61 #define profile_tick(p, framep) { (p)->p_flag |= SOWEUPC; aston(); } 62 63 /* 64 * Notify the current process (p) that it has a signal pending, 65 * process as soon as possible. 66 */ 67 #define signotify(p) aston() 68 69 #define aston() (astpending++) 70 71 int astpending; /* need to trap before returning to user mode */ 72 int want_resched; /* resched() was called */ 73 74 /* 75 * Kinds of processor 76 */ 77 78 #define CPU_386SX 0 79 #define CPU_386 1 80 #define CPU_486SX 2 81 #define CPU_486 3 82 #define CPU_586 4 83