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 5.6 (Berkeley) 10/11/92 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 #define cpu_setstack(p, ap) \ 37 (p)->p_md.md_regs[SP] = ap 38 39 /* 40 * Arguments to hardclock, softclock and gatherstats 41 * encapsulate the previous machine state in an opaque 42 * clockframe; for now, use generic intrframe. 43 */ 44 typedef struct intrframe clockframe; 45 46 #define CLKF_USERMODE(framep) (ISPL((framep)->if_cs) == SEL_UPL) 47 #define CLKF_BASEPRI(framep) ((framep)->if_ppl == 0) 48 #define CLKF_PC(framep) ((framep)->if_eip) 49 50 #define resettodr() /* no todr to set */ 51 52 /* 53 * Preempt the current process if in interrupt from user mode, 54 * or after the current trap/syscall if in system mode. 55 */ 56 #define need_resched() { want_resched++; aston(); } 57 58 /* 59 * Give a profiling tick to the current process from the softclock 60 * interrupt. On tahoe, request an ast to send us through trap(), 61 * marking the proc as needing a profiling tick. 62 */ 63 #define profile_tick(p, framep) { (p)->p_flag |= SOWEUPC; aston(); } 64 65 /* 66 * Notify the current process (p) that it has a signal pending, 67 * process as soon as possible. 68 */ 69 #define signotify(p) aston() 70 71 #define aston() (astpending++) 72 73 int astpending; /* need to trap before returning to user mode */ 74 int want_resched; /* resched() was called */ 75 76 /* 77 * Kinds of processor 78 */ 79 80 #define CPU_386SX 0 81 #define CPU_386 1 82 #define CPU_486SX 2 83 #define CPU_486 3 84 #define CPU_586 4 85