npx.c revision 49081
1169689Skan/*- 2169689Skan * Copyright (c) 1990 William Jolitz. 3169689Skan * Copyright (c) 1991 The Regents of the University of California. 4169689Skan * All rights reserved. 5169689Skan * 6169689Skan * Redistribution and use in source and binary forms, with or without 7169689Skan * modification, are permitted provided that the following conditions 8169689Skan * are met: 9169689Skan * 1. Redistributions of source code must retain the above copyright 10169689Skan * notice, this list of conditions and the following disclaimer. 11169689Skan * 2. Redistributions in binary form must reproduce the above copyright 12169689Skan * notice, this list of conditions and the following disclaimer in the 13169689Skan * documentation and/or other materials provided with the distribution. 14169689Skan * 3. All advertising materials mentioning features or use of this software 15169689Skan * must display the following acknowledgement: 16169689Skan * This product includes software developed by the University of 17169689Skan * California, Berkeley and its contributors. 18169689Skan * 4. Neither the name of the University nor the names of its contributors 19169689Skan * may be used to endorse or promote products derived from this software 20169689Skan * without specific prior written permission. 21169689Skan * 22169689Skan * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23169689Skan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24169689Skan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25169689Skan * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26169689Skan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27169689Skan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28169689Skan * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29169689Skan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30169689Skan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31169689Skan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32169689Skan * SUCH DAMAGE. 33169689Skan * 34169689Skan * from: @(#)npx.c 7.2 (Berkeley) 5/12/91 35169689Skan * $Id: npx.c,v 1.73 1999/05/15 17:58:58 peter Exp $ 36169689Skan */ 37169689Skan 38169689Skan#include "npx.h" 39169689Skan#if NNPX > 0 40169689Skan 41169689Skan#include "opt_debug_npx.h" 42169689Skan#include "opt_math_emulate.h" 43169689Skan 44169689Skan#include <sys/param.h> 45169689Skan#include <sys/systm.h> 46169689Skan#include <sys/bus.h> 47169689Skan#include <sys/kernel.h> 48169689Skan#include <sys/malloc.h> 49169689Skan#include <sys/module.h> 50169689Skan#include <sys/sysctl.h> 51169689Skan#include <sys/proc.h> 52169689Skan#include <machine/bus.h> 53169689Skan#include <sys/rman.h> 54169689Skan#ifdef NPX_DEBUG 55169689Skan#include <sys/syslog.h> 56169689Skan#endif 57169689Skan#include <sys/signalvar.h> 58169689Skan 59169689Skan#ifndef SMP 60169689Skan#include <machine/asmacros.h> 61169689Skan#endif 62169689Skan#include <machine/cputypes.h> 63169689Skan#include <machine/frame.h> 64169689Skan#include <machine/ipl.h> 65169689Skan#include <machine/md_var.h> 66169689Skan#include <machine/pcb.h> 67169689Skan#include <machine/psl.h> 68169689Skan#ifndef SMP 69169689Skan#include <machine/clock.h> 70169689Skan#endif 71169689Skan#include <machine/resource.h> 72169689Skan#include <machine/specialreg.h> 73169689Skan#include <machine/segments.h> 74169689Skan 75169689Skan#ifndef SMP 76169689Skan#include <i386/isa/icu.h> 77169689Skan#include <i386/isa/intr_machdep.h> 78169689Skan#include <i386/isa/isa.h> 79169689Skan#endif 80169689Skan 81169689Skan/* 82169689Skan * 387 and 287 Numeric Coprocessor Extension (NPX) Driver. 83169689Skan */ 84169689Skan 85169689Skan/* Configuration flags. */ 86169689Skan#define NPX_DISABLE_I586_OPTIMIZED_BCOPY (1 << 0) 87169689Skan#define NPX_DISABLE_I586_OPTIMIZED_BZERO (1 << 1) 88169689Skan#define NPX_DISABLE_I586_OPTIMIZED_COPYIO (1 << 2) 89169689Skan#define NPX_PREFER_EMULATOR (1 << 3) 90169689Skan 91169689Skan#ifdef __GNUC__ 92169689Skan 93169689Skan#define fldcw(addr) __asm("fldcw %0" : : "m" (*(addr))) 94169689Skan#define fnclex() __asm("fnclex") 95169689Skan#define fninit() __asm("fninit") 96169689Skan#define fnop() __asm("fnop") 97169689Skan#define fnsave(addr) __asm __volatile("fnsave %0" : "=m" (*(addr))) 98169689Skan#define fnstcw(addr) __asm __volatile("fnstcw %0" : "=m" (*(addr))) 99169689Skan#define fnstsw(addr) __asm __volatile("fnstsw %0" : "=m" (*(addr))) 100169689Skan#define fp_divide_by_0() __asm("fldz; fld1; fdiv %st,%st(1); fnop") 101169689Skan#define frstor(addr) __asm("frstor %0" : : "m" (*(addr))) 102169689Skan#define start_emulating() __asm("smsw %%ax; orb %0,%%al; lmsw %%ax" \ 103169689Skan : : "n" (CR0_TS) : "ax") 104169689Skan#define stop_emulating() __asm("clts") 105169689Skan 106169689Skan#else /* not __GNUC__ */ 107169689Skan 108169689Skanvoid fldcw __P((caddr_t addr)); 109169689Skanvoid fnclex __P((void)); 110169689Skanvoid fninit __P((void)); 111169689Skanvoid fnop __P((void)); 112169689Skanvoid fnsave __P((caddr_t addr)); 113169689Skanvoid fnstcw __P((caddr_t addr)); 114169689Skanvoid fnstsw __P((caddr_t addr)); 115169689Skanvoid fp_divide_by_0 __P((void)); 116169689Skanvoid frstor __P((caddr_t addr)); 117169689Skanvoid start_emulating __P((void)); 118169689Skanvoid stop_emulating __P((void)); 119169689Skan 120169689Skan#endif /* __GNUC__ */ 121169689Skan 122169689Skantypedef u_char bool_t; 123169689Skan 124169689Skanstatic int npx_attach __P((device_t dev)); 125169689Skan void npx_intr __P((void *)); 126169689Skanstatic int npx_probe __P((device_t dev)); 127169689Skanstatic int npx_probe1 __P((device_t dev)); 128169689Skan#ifdef I586_CPU 129169689Skanstatic long timezero __P((const char *funcname, 130169689Skan void (*func)(void *buf, size_t len))); 131169689Skan#endif /* I586_CPU */ 132169689Skan 133169689Skanint hw_float; /* XXX currently just alias for npx_exists */ 134169689Skan 135169689SkanSYSCTL_INT(_hw,HW_FLOATINGPT, floatingpoint, 136169689Skan CTLFLAG_RD, &hw_float, 0, 137169689Skan "Floatingpoint instructions executed in hardware"); 138169689Skan 139169689Skan#ifndef SMP 140169689Skanstatic u_int npx0_imask = SWI_CLOCK_MASK; 141169689Skanstatic struct gate_descriptor npx_idt_probeintr; 142169689Skanstatic int npx_intrno; 143169689Skanstatic volatile u_int npx_intrs_while_probing; 144169689Skanstatic volatile u_int npx_traps_while_probing; 145169689Skan#endif 146169689Skan 147169689Skanstatic bool_t npx_ex16; 148169689Skanstatic bool_t npx_exists; 149169689Skanstatic bool_t npx_irq13; 150169689Skanstatic int npx_irq; /* irq number */ 151169689Skan 152169689Skan#ifndef SMP 153169689Skan/* 154169689Skan * Special interrupt handlers. Someday intr0-intr15 will be used to count 155169689Skan * interrupts. We'll still need a special exception 16 handler. The busy 156169689Skan * latch stuff in probeintr() can be moved to npxprobe(). 157169689Skan */ 158169689Skaninthand_t probeintr; 159169689Skan__asm(" \n\ 160169689Skan .text \n\ 161169689Skan .p2align 2,0x90 \n\ 162169689Skan .type " __XSTRING(CNAME(probeintr)) ",@function \n\ 163169689Skan" __XSTRING(CNAME(probeintr)) ": \n\ 164169689Skan ss \n\ 165169689Skan incl " __XSTRING(CNAME(npx_intrs_while_probing)) " \n\ 166169689Skan pushl %eax \n\ 167169689Skan movb $0x20,%al # EOI (asm in strings loses cpp features) \n\ 168169689Skan outb %al,$0xa0 # IO_ICU2 \n\ 169169689Skan outb %al,$0x20 # IO_ICU1 \n\ 170169689Skan movb $0,%al \n\ 171169689Skan outb %al,$0xf0 # clear BUSY# latch \n\ 172169689Skan popl %eax \n\ 173169689Skan iret \n\ 174169689Skan"); 175169689Skan 176169689Skaninthand_t probetrap; 177169689Skan__asm(" \n\ 178169689Skan .text \n\ 179169689Skan .p2align 2,0x90 \n\ 180169689Skan .type " __XSTRING(CNAME(probetrap)) ",@function \n\ 181169689Skan" __XSTRING(CNAME(probetrap)) ": \n\ 182169689Skan ss \n\ 183169689Skan incl " __XSTRING(CNAME(npx_traps_while_probing)) " \n\ 184169689Skan fnclex \n\ 185169689Skan iret \n\ 186169689Skan"); 187169689Skan#endif /* SMP */ 188169689Skan 189169689Skan/* 190169689Skan * Probe routine. Initialize cr0 to give correct behaviour for [f]wait 191169689Skan * whether the device exists or not (XXX should be elsewhere). Set flags 192169689Skan * to tell npxattach() what to do. Modify device struct if npx doesn't 193169689Skan * need to use interrupts. Return 1 if device exists. 194169689Skan */ 195169689Skanstatic int 196169689Skannpx_probe(dev) 197169689Skan device_t dev; 198169689Skan{ 199169689Skan#ifdef SMP 200169689Skan 201169689Skan if (resource_int_value("npx", 0, "irq", &npx_irq) != 0) 202169689Skan npx_irq = 13; 203169689Skan return npx_probe1(dev); 204169689Skan 205169689Skan#else /* SMP */ 206169689Skan 207169689Skan int result; 208169689Skan u_long save_eflags; 209169689Skan u_char save_icu1_mask; 210169689Skan u_char save_icu2_mask; 211169689Skan struct gate_descriptor save_idt_npxintr; 212169689Skan struct gate_descriptor save_idt_npxtrap; 213169689Skan /* 214169689Skan * This routine is now just a wrapper for npxprobe1(), to install 215169689Skan * special npx interrupt and trap handlers, to enable npx interrupts 216169689Skan * and to disable other interrupts. Someday isa_configure() will 217169689Skan * install suitable handlers and run with interrupts enabled so we 218169689Skan * won't need to do so much here. 219169689Skan */ 220169689Skan if (resource_int_value("npx", 0, "irq", &npx_irq) != 0) 221169689Skan npx_irq = 13; 222169689Skan npx_intrno = NRSVIDT + npx_irq; 223169689Skan save_eflags = read_eflags(); 224169689Skan disable_intr(); 225169689Skan save_icu1_mask = inb(IO_ICU1 + 1); 226169689Skan save_icu2_mask = inb(IO_ICU2 + 1); 227169689Skan save_idt_npxintr = idt[npx_intrno]; 228169689Skan save_idt_npxtrap = idt[16]; 229169689Skan outb(IO_ICU1 + 1, ~IRQ_SLAVE); 230169689Skan outb(IO_ICU2 + 1, ~(1 << (npx_irq - 8))); 231169689Skan setidt(16, probetrap, SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 232169689Skan setidt(npx_intrno, probeintr, SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 233169689Skan npx_idt_probeintr = idt[npx_intrno]; 234169689Skan enable_intr(); 235169689Skan result = npx_probe1(dev); 236169689Skan disable_intr(); 237169689Skan outb(IO_ICU1 + 1, save_icu1_mask); 238169689Skan outb(IO_ICU2 + 1, save_icu2_mask); 239169689Skan idt[npx_intrno] = save_idt_npxintr; 240169689Skan idt[16] = save_idt_npxtrap; 241169689Skan write_eflags(save_eflags); 242169689Skan return (result); 243169689Skan 244169689Skan#endif /* SMP */ 245169689Skan} 246169689Skan 247169689Skanstatic int 248169689Skannpx_probe1(dev) 249169689Skan device_t dev; 250169689Skan{ 251169689Skan#ifndef SMP 252169689Skan u_short control; 253169689Skan u_short status; 254169689Skan#endif 255169689Skan 256169689Skan /* 257169689Skan * Partially reset the coprocessor, if any. Some BIOS's don't reset 258169689Skan * it after a warm boot. 259169689Skan */ 260169689Skan outb(0xf1, 0); /* full reset on some systems, NOP on others */ 261169689Skan outb(0xf0, 0); /* clear BUSY# latch */ 262169689Skan /* 263169689Skan * Prepare to trap all ESC (i.e., NPX) instructions and all WAIT 264169689Skan * instructions. We must set the CR0_MP bit and use the CR0_TS 265169689Skan * bit to control the trap, because setting the CR0_EM bit does 266169689Skan * not cause WAIT instructions to trap. It's important to trap 267169689Skan * WAIT instructions - otherwise the "wait" variants of no-wait 268169689Skan * control instructions would degenerate to the "no-wait" variants 269169689Skan * after FP context switches but work correctly otherwise. It's 270169689Skan * particularly important to trap WAITs when there is no NPX - 271169689Skan * otherwise the "wait" variants would always degenerate. 272169689Skan * 273169689Skan * Try setting CR0_NE to get correct error reporting on 486DX's. 274169689Skan * Setting it should fail or do nothing on lesser processors. 275169689Skan */ 276169689Skan load_cr0(rcr0() | CR0_MP | CR0_NE); 277169689Skan /* 278169689Skan * But don't trap while we're probing. 279169689Skan */ 280169689Skan stop_emulating(); 281169689Skan /* 282169689Skan * Finish resetting the coprocessor, if any. If there is an error 283169689Skan * pending, then we may get a bogus IRQ13, but probeintr() will handle 284169689Skan * it OK. Bogus halts have never been observed, but we enabled 285169689Skan * IRQ13 and cleared the BUSY# latch early to handle them anyway. 286169689Skan */ 287169689Skan fninit(); 288169689Skan 289169689Skan#ifdef SMP 290169689Skan /* 291169689Skan * Exception 16 MUST work for SMP. 292169689Skan */ 293169689Skan npx_irq13 = 0; 294169689Skan npx_ex16 = hw_float = npx_exists = 1; 295169689Skan device_set_desc(dev, "math processor"); 296169689Skan return (0); 297169689Skan 298169689Skan#else /* !SMP */ 299169689Skan device_set_desc(dev, "math processor"); 300169689Skan 301169689Skan /* 302169689Skan * Don't use fwait here because it might hang. 303169689Skan * Don't use fnop here because it usually hangs if there is no FPU. 304169689Skan */ 305169689Skan DELAY(1000); /* wait for any IRQ13 */ 306169689Skan#ifdef DIAGNOSTIC 307169689Skan if (npx_intrs_while_probing != 0) 308169689Skan printf("fninit caused %u bogus npx interrupt(s)\n", 309169689Skan npx_intrs_while_probing); 310169689Skan if (npx_traps_while_probing != 0) 311169689Skan printf("fninit caused %u bogus npx trap(s)\n", 312169689Skan npx_traps_while_probing); 313169689Skan#endif 314169689Skan /* 315169689Skan * Check for a status of mostly zero. 316169689Skan */ 317169689Skan status = 0x5a5a; 318169689Skan fnstsw(&status); 319169689Skan if ((status & 0xb8ff) == 0) { 320169689Skan /* 321169689Skan * Good, now check for a proper control word. 322169689Skan */ 323169689Skan control = 0x5a5a; 324169689Skan fnstcw(&control); 325169689Skan if ((control & 0x1f3f) == 0x033f) { 326169689Skan hw_float = npx_exists = 1; 327169689Skan /* 328169689Skan * We have an npx, now divide by 0 to see if exception 329169689Skan * 16 works. 330169689Skan */ 331169689Skan control &= ~(1 << 2); /* enable divide by 0 trap */ 332169689Skan fldcw(&control); 333169689Skan npx_traps_while_probing = npx_intrs_while_probing = 0; 334169689Skan fp_divide_by_0(); 335169689Skan if (npx_traps_while_probing != 0) { 336169689Skan /* 337169689Skan * Good, exception 16 works. 338169689Skan */ 339169689Skan npx_ex16 = 1; 340169689Skan return (0); 341169689Skan } 342169689Skan if (npx_intrs_while_probing != 0) { 343169689Skan int rid; 344169689Skan struct resource *r; 345169689Skan void *intr; 346169689Skan /* 347169689Skan * Bad, we are stuck with IRQ13. 348169689Skan */ 349169689Skan npx_irq13 = 1; 350169689Skan /* 351169689Skan * npxattach would be too late to set npx0_imask 352169689Skan */ 353169689Skan npx0_imask |= (1 << npx_irq); 354169689Skan 355169689Skan /* 356169689Skan * We allocate these resources permanently, 357169689Skan * so there is no need to keep track of them. 358169689Skan */ 359169689Skan rid = 0; 360169689Skan r = bus_alloc_resource(dev, SYS_RES_IOPORT, 361169689Skan &rid, IO_NPX, IO_NPX, 362169689Skan IO_NPXSIZE, RF_ACTIVE); 363169689Skan if (r == 0) 364169689Skan panic("npx: can't get ports"); 365169689Skan rid = 0; 366169689Skan r = bus_alloc_resource(dev, SYS_RES_IRQ, 367169689Skan &rid, npx_irq, npx_irq, 368169689Skan 1, RF_ACTIVE); 369169689Skan if (r == 0) 370169689Skan panic("npx: can't get IRQ"); 371169689Skan BUS_SETUP_INTR(device_get_parent(dev), 372169689Skan dev, r, INTR_TYPE_MISC, 373169689Skan npx_intr, 0, &intr); 374169689Skan if (intr == 0) 375169689Skan panic("npx: can't create intr"); 376169689Skan 377169689Skan return (0); 378169689Skan } 379169689Skan /* 380169689Skan * Worse, even IRQ13 is broken. Use emulator. 381169689Skan */ 382169689Skan } 383169689Skan } 384169689Skan /* 385169689Skan * Probe failed, but we want to get to npxattach to initialize the 386169689Skan * emulator and say that it has been installed. XXX handle devices 387169689Skan * that aren't really devices better. 388169689Skan */ 389169689Skan return (0); 390169689Skan#endif /* SMP */ 391169689Skan} 392169689Skan 393169689Skan/* 394169689Skan * Attach routine - announce which it is, and wire into system 395169689Skan */ 396169689Skanint 397169689Skannpx_attach(dev) 398169689Skan device_t dev; 399169689Skan{ 400169689Skan int flags; 401169689Skan 402169689Skan if (resource_int_value("npx", 0, "flags", &flags) != 0) 403169689Skan flags = 0; 404169689Skan 405169689Skan device_print_prettyname(dev); 406169689Skan if (npx_irq13) { 407169689Skan printf("using IRQ 13 interface\n"); 408169689Skan } else { 409169689Skan#if defined(MATH_EMULATE) || defined(GPL_MATH_EMULATE) 410169689Skan if (npx_ex16) { 411169689Skan if (!(flags & NPX_PREFER_EMULATOR)) 412169689Skan printf("INT 16 interface\n"); 413169689Skan else { 414169689Skan printf("FPU exists, but flags request " 415169689Skan "emulator\n"); 416169689Skan hw_float = npx_exists = 0; 417169689Skan } 418169689Skan } else if (npx_exists) { 419169689Skan printf("error reporting broken; using 387 emulator\n"); 420169689Skan hw_float = npx_exists = 0; 421169689Skan } else 422169689Skan printf("387 emulator\n"); 423169689Skan#else 424169689Skan if (npx_ex16) { 425169689Skan printf("INT 16 interface\n"); 426169689Skan if (flags & NPX_PREFER_EMULATOR) { 427169689Skan printf("emulator requested, but none compiled " 428169689Skan "into kernel, using FPU\n"); 429169689Skan } 430169689Skan } else 431169689Skan printf("no 387 emulator in kernel and no FPU!\n"); 432169689Skan#endif 433169689Skan } 434169689Skan npxinit(__INITIAL_NPXCW__); 435169689Skan 436169689Skan#ifdef I586_CPU 437169689Skan if (cpu_class == CPUCLASS_586 && npx_ex16 && npx_exists && 438169689Skan timezero("i586_bzero()", i586_bzero) < 439169689Skan timezero("bzero()", bzero) * 4 / 5) { 440169689Skan if (!(flags & NPX_DISABLE_I586_OPTIMIZED_BCOPY)) { 441169689Skan bcopy_vector = i586_bcopy; 442169689Skan ovbcopy_vector = i586_bcopy; 443169689Skan } 444169689Skan if (!(flags & NPX_DISABLE_I586_OPTIMIZED_BZERO)) 445169689Skan bzero = i586_bzero; 446169689Skan if (!(flags & NPX_DISABLE_I586_OPTIMIZED_COPYIO)) { 447169689Skan copyin_vector = i586_copyin; 448169689Skan copyout_vector = i586_copyout; 449169689Skan } 450169689Skan } 451169689Skan#endif 452169689Skan 453169689Skan return (0); /* XXX unused */ 454169689Skan} 455169689Skan 456169689Skan/* 457169689Skan * Initialize floating point unit. 458169689Skan */ 459169689Skanvoid 460169689Skannpxinit(control) 461169689Skan u_short control; 462169689Skan{ 463169689Skan struct save87 dummy; 464169689Skan 465169689Skan if (!npx_exists) 466169689Skan return; 467169689Skan /* 468169689Skan * fninit has the same h/w bugs as fnsave. Use the detoxified 469169689Skan * fnsave to throw away any junk in the fpu. npxsave() initializes 470169689Skan * the fpu and sets npxproc = NULL as important side effects. 471169689Skan */ 472169689Skan npxsave(&dummy); 473169689Skan stop_emulating(); 474169689Skan fldcw(&control); 475169689Skan if (curpcb != NULL) 476169689Skan fnsave(&curpcb->pcb_savefpu); 477169689Skan start_emulating(); 478169689Skan} 479169689Skan 480169689Skan/* 481169689Skan * Free coprocessor (if we have it). 482169689Skan */ 483169689Skanvoid 484169689Skannpxexit(p) 485169689Skan struct proc *p; 486169689Skan{ 487169689Skan 488169689Skan if (p == npxproc) 489169689Skan npxsave(&curpcb->pcb_savefpu); 490169689Skan#ifdef NPX_DEBUG 491169689Skan if (npx_exists) { 492169689Skan u_int masked_exceptions; 493169689Skan 494169689Skan masked_exceptions = curpcb->pcb_savefpu.sv_env.en_cw 495169689Skan & curpcb->pcb_savefpu.sv_env.en_sw & 0x7f; 496169689Skan /* 497169689Skan * Log exceptions that would have trapped with the old 498169689Skan * control word (overflow, divide by 0, and invalid operand). 499169689Skan */ 500169689Skan if (masked_exceptions & 0x0d) 501169689Skan log(LOG_ERR, 502169689Skan "pid %d (%s) exited with masked floating point exceptions 0x%02x\n", 503169689Skan p->p_pid, p->p_comm, masked_exceptions); 504169689Skan } 505169689Skan#endif 506169689Skan} 507169689Skan 508169689Skan/* 509169689Skan * The following mechanism is used to ensure that the FPE_... value 510169689Skan * that is passed as a trapcode to the signal handler of the user 511169689Skan * process does not have more than one bit set. 512169689Skan * 513169689Skan * Multiple bits may be set if the user process modifies the control 514169689Skan * word while a status word bit is already set. While this is a sign 515169689Skan * of bad coding, we have no choise than to narrow them down to one 516169689Skan * bit, since we must not send a trapcode that is not exactly one of 517169689Skan * the FPE_ macros. 518169689Skan * 519169689Skan * The mechanism has a static table with 127 entries. Each combination 520169689Skan * of the 7 FPU status word exception bits directly translates to a 521169689Skan * position in this table, where a single FPE_... value is stored. 522169689Skan * This FPE_... value stored there is considered the "most important" 523169689Skan * of the exception bits and will be sent as the signal code. The 524169689Skan * precedence of the bits is based upon Intel Document "Numerical 525169689Skan * Applications", Chapter "Special Computational Situations". 526169689Skan * 527169689Skan * The macro to choose one of these values does these steps: 1) Throw 528169689Skan * away status word bits that cannot be masked. 2) Throw away the bits 529169689Skan * currently masked in the control word, assuming the user isn't 530169689Skan * interested in them anymore. 3) Reinsert status word bit 7 (stack 531169689Skan * fault) if it is set, which cannot be masked but must be presered. 532169689Skan * 4) Use the remaining bits to point into the trapcode table. 533169689Skan * 534169689Skan * The 6 maskable bits in order of their preference, as stated in the 535169689Skan * above referenced Intel manual: 536169689Skan * 1 Invalid operation (FP_X_INV) 537169689Skan * 1a Stack underflow 538169689Skan * 1b Stack overflow 539169689Skan * 1c Operand of unsupported format 540169689Skan * 1d SNaN operand. 541169689Skan * 2 QNaN operand (not an exception, irrelavant here) 542169689Skan * 3 Any other invalid-operation not mentioned above or zero divide 543169689Skan * (FP_X_INV, FP_X_DZ) 544169689Skan * 4 Denormal operand (FP_X_DNML) 545169689Skan * 5 Numeric over/underflow (FP_X_OFL, FP_X_UFL) 546169689Skan * 6 Inexact result (FP_X_IMP) */ 547169689Skan 548169689Skanstatic char fpetable[128] = { 549169689Skan 0, 550169689Skan FPE_FLTINV, /* 1 - INV */ 551169689Skan FPE_FLTUND, /* 2 - DNML */ 552169689Skan FPE_FLTINV, /* 3 - INV | DNML */ 553169689Skan FPE_FLTDIV, /* 4 - DZ */ 554169689Skan FPE_FLTINV, /* 5 - INV | DZ */ 555169689Skan FPE_FLTDIV, /* 6 - DNML | DZ */ 556169689Skan FPE_FLTINV, /* 7 - INV | DNML | DZ */ 557169689Skan FPE_FLTOVF, /* 8 - OFL */ 558169689Skan FPE_FLTINV, /* 9 - INV | OFL */ 559169689Skan FPE_FLTUND, /* A - DNML | OFL */ 560169689Skan FPE_FLTINV, /* B - INV | DNML | OFL */ 561169689Skan FPE_FLTDIV, /* C - DZ | OFL */ 562169689Skan FPE_FLTINV, /* D - INV | DZ | OFL */ 563169689Skan FPE_FLTDIV, /* E - DNML | DZ | OFL */ 564169689Skan FPE_FLTINV, /* F - INV | DNML | DZ | OFL */ 565169689Skan FPE_FLTUND, /* 10 - UFL */ 566169689Skan FPE_FLTINV, /* 11 - INV | UFL */ 567169689Skan FPE_FLTUND, /* 12 - DNML | UFL */ 568169689Skan FPE_FLTINV, /* 13 - INV | DNML | UFL */ 569169689Skan FPE_FLTDIV, /* 14 - DZ | UFL */ 570169689Skan FPE_FLTINV, /* 15 - INV | DZ | UFL */ 571169689Skan FPE_FLTDIV, /* 16 - DNML | DZ | UFL */ 572169689Skan FPE_FLTINV, /* 17 - INV | DNML | DZ | UFL */ 573169689Skan FPE_FLTOVF, /* 18 - OFL | UFL */ 574169689Skan FPE_FLTINV, /* 19 - INV | OFL | UFL */ 575169689Skan FPE_FLTUND, /* 1A - DNML | OFL | UFL */ 576169689Skan FPE_FLTINV, /* 1B - INV | DNML | OFL | UFL */ 577169689Skan FPE_FLTDIV, /* 1C - DZ | OFL | UFL */ 578169689Skan FPE_FLTINV, /* 1D - INV | DZ | OFL | UFL */ 579169689Skan FPE_FLTDIV, /* 1E - DNML | DZ | OFL | UFL */ 580169689Skan FPE_FLTINV, /* 1F - INV | DNML | DZ | OFL | UFL */ 581169689Skan FPE_FLTRES, /* 20 - IMP */ 582169689Skan FPE_FLTINV, /* 21 - INV | IMP */ 583169689Skan FPE_FLTUND, /* 22 - DNML | IMP */ 584169689Skan FPE_FLTINV, /* 23 - INV | DNML | IMP */ 585169689Skan FPE_FLTDIV, /* 24 - DZ | IMP */ 586169689Skan FPE_FLTINV, /* 25 - INV | DZ | IMP */ 587169689Skan FPE_FLTDIV, /* 26 - DNML | DZ | IMP */ 588169689Skan FPE_FLTINV, /* 27 - INV | DNML | DZ | IMP */ 589169689Skan FPE_FLTOVF, /* 28 - OFL | IMP */ 590169689Skan FPE_FLTINV, /* 29 - INV | OFL | IMP */ 591169689Skan FPE_FLTUND, /* 2A - DNML | OFL | IMP */ 592169689Skan FPE_FLTINV, /* 2B - INV | DNML | OFL | IMP */ 593169689Skan FPE_FLTDIV, /* 2C - DZ | OFL | IMP */ 594169689Skan FPE_FLTINV, /* 2D - INV | DZ | OFL | IMP */ 595169689Skan FPE_FLTDIV, /* 2E - DNML | DZ | OFL | IMP */ 596169689Skan FPE_FLTINV, /* 2F - INV | DNML | DZ | OFL | IMP */ 597169689Skan FPE_FLTUND, /* 30 - UFL | IMP */ 598169689Skan FPE_FLTINV, /* 31 - INV | UFL | IMP */ 599169689Skan FPE_FLTUND, /* 32 - DNML | UFL | IMP */ 600169689Skan FPE_FLTINV, /* 33 - INV | DNML | UFL | IMP */ 601169689Skan FPE_FLTDIV, /* 34 - DZ | UFL | IMP */ 602169689Skan FPE_FLTINV, /* 35 - INV | DZ | UFL | IMP */ 603169689Skan FPE_FLTDIV, /* 36 - DNML | DZ | UFL | IMP */ 604169689Skan FPE_FLTINV, /* 37 - INV | DNML | DZ | UFL | IMP */ 605169689Skan FPE_FLTOVF, /* 38 - OFL | UFL | IMP */ 606169689Skan FPE_FLTINV, /* 39 - INV | OFL | UFL | IMP */ 607169689Skan FPE_FLTUND, /* 3A - DNML | OFL | UFL | IMP */ 608169689Skan FPE_FLTINV, /* 3B - INV | DNML | OFL | UFL | IMP */ 609169689Skan FPE_FLTDIV, /* 3C - DZ | OFL | UFL | IMP */ 610169689Skan FPE_FLTINV, /* 3D - INV | DZ | OFL | UFL | IMP */ 611169689Skan FPE_FLTDIV, /* 3E - DNML | DZ | OFL | UFL | IMP */ 612169689Skan FPE_FLTINV, /* 3F - INV | DNML | DZ | OFL | UFL | IMP */ 613169689Skan FPE_FLTSUB, /* 40 - STK */ 614169689Skan FPE_FLTSUB, /* 41 - INV | STK */ 615169689Skan FPE_FLTUND, /* 42 - DNML | STK */ 616169689Skan FPE_FLTSUB, /* 43 - INV | DNML | STK */ 617169689Skan FPE_FLTDIV, /* 44 - DZ | STK */ 618169689Skan FPE_FLTSUB, /* 45 - INV | DZ | STK */ 619169689Skan FPE_FLTDIV, /* 46 - DNML | DZ | STK */ 620169689Skan FPE_FLTSUB, /* 47 - INV | DNML | DZ | STK */ 621169689Skan FPE_FLTOVF, /* 48 - OFL | STK */ 622169689Skan FPE_FLTSUB, /* 49 - INV | OFL | STK */ 623169689Skan FPE_FLTUND, /* 4A - DNML | OFL | STK */ 624169689Skan FPE_FLTSUB, /* 4B - INV | DNML | OFL | STK */ 625169689Skan FPE_FLTDIV, /* 4C - DZ | OFL | STK */ 626169689Skan FPE_FLTSUB, /* 4D - INV | DZ | OFL | STK */ 627169689Skan FPE_FLTDIV, /* 4E - DNML | DZ | OFL | STK */ 628169689Skan FPE_FLTSUB, /* 4F - INV | DNML | DZ | OFL | STK */ 629169689Skan FPE_FLTUND, /* 50 - UFL | STK */ 630169689Skan FPE_FLTSUB, /* 51 - INV | UFL | STK */ 631169689Skan FPE_FLTUND, /* 52 - DNML | UFL | STK */ 632169689Skan FPE_FLTSUB, /* 53 - INV | DNML | UFL | STK */ 633169689Skan FPE_FLTDIV, /* 54 - DZ | UFL | STK */ 634169689Skan FPE_FLTSUB, /* 55 - INV | DZ | UFL | STK */ 635169689Skan FPE_FLTDIV, /* 56 - DNML | DZ | UFL | STK */ 636169689Skan FPE_FLTSUB, /* 57 - INV | DNML | DZ | UFL | STK */ 637169689Skan FPE_FLTOVF, /* 58 - OFL | UFL | STK */ 638169689Skan FPE_FLTSUB, /* 59 - INV | OFL | UFL | STK */ 639169689Skan FPE_FLTUND, /* 5A - DNML | OFL | UFL | STK */ 640169689Skan FPE_FLTSUB, /* 5B - INV | DNML | OFL | UFL | STK */ 641169689Skan FPE_FLTDIV, /* 5C - DZ | OFL | UFL | STK */ 642169689Skan FPE_FLTSUB, /* 5D - INV | DZ | OFL | UFL | STK */ 643169689Skan FPE_FLTDIV, /* 5E - DNML | DZ | OFL | UFL | STK */ 644169689Skan FPE_FLTSUB, /* 5F - INV | DNML | DZ | OFL | UFL | STK */ 645169689Skan FPE_FLTRES, /* 60 - IMP | STK */ 646169689Skan FPE_FLTSUB, /* 61 - INV | IMP | STK */ 647169689Skan FPE_FLTUND, /* 62 - DNML | IMP | STK */ 648169689Skan FPE_FLTSUB, /* 63 - INV | DNML | IMP | STK */ 649169689Skan FPE_FLTDIV, /* 64 - DZ | IMP | STK */ 650169689Skan FPE_FLTSUB, /* 65 - INV | DZ | IMP | STK */ 651169689Skan FPE_FLTDIV, /* 66 - DNML | DZ | IMP | STK */ 652169689Skan FPE_FLTSUB, /* 67 - INV | DNML | DZ | IMP | STK */ 653169689Skan FPE_FLTOVF, /* 68 - OFL | IMP | STK */ 654169689Skan FPE_FLTSUB, /* 69 - INV | OFL | IMP | STK */ 655169689Skan FPE_FLTUND, /* 6A - DNML | OFL | IMP | STK */ 656169689Skan FPE_FLTSUB, /* 6B - INV | DNML | OFL | IMP | STK */ 657169689Skan FPE_FLTDIV, /* 6C - DZ | OFL | IMP | STK */ 658169689Skan FPE_FLTSUB, /* 6D - INV | DZ | OFL | IMP | STK */ 659169689Skan FPE_FLTDIV, /* 6E - DNML | DZ | OFL | IMP | STK */ 660169689Skan FPE_FLTSUB, /* 6F - INV | DNML | DZ | OFL | IMP | STK */ 661169689Skan FPE_FLTUND, /* 70 - UFL | IMP | STK */ 662169689Skan FPE_FLTSUB, /* 71 - INV | UFL | IMP | STK */ 663169689Skan FPE_FLTUND, /* 72 - DNML | UFL | IMP | STK */ 664169689Skan FPE_FLTSUB, /* 73 - INV | DNML | UFL | IMP | STK */ 665169689Skan FPE_FLTDIV, /* 74 - DZ | UFL | IMP | STK */ 666169689Skan FPE_FLTSUB, /* 75 - INV | DZ | UFL | IMP | STK */ 667169689Skan FPE_FLTDIV, /* 76 - DNML | DZ | UFL | IMP | STK */ 668169689Skan FPE_FLTSUB, /* 77 - INV | DNML | DZ | UFL | IMP | STK */ 669169689Skan FPE_FLTOVF, /* 78 - OFL | UFL | IMP | STK */ 670169689Skan FPE_FLTSUB, /* 79 - INV | OFL | UFL | IMP | STK */ 671169689Skan FPE_FLTUND, /* 7A - DNML | OFL | UFL | IMP | STK */ 672169689Skan FPE_FLTSUB, /* 7B - INV | DNML | OFL | UFL | IMP | STK */ 673169689Skan FPE_FLTDIV, /* 7C - DZ | OFL | UFL | IMP | STK */ 674169689Skan FPE_FLTSUB, /* 7D - INV | DZ | OFL | UFL | IMP | STK */ 675169689Skan FPE_FLTDIV, /* 7E - DNML | DZ | OFL | UFL | IMP | STK */ 676169689Skan FPE_FLTSUB, /* 7F - INV | DNML | DZ | OFL | UFL | IMP | STK */ 677169689Skan}; 678169689Skan 679169689Skan#define ENCODE(_sw, _cw) (fpetable[(_sw & ~_cw & 0x3f) | (_sw & 0x40)]) 680169689Skan 681169689Skan/* 682169689Skan * Preserve the FP status word, clear FP exceptions, then generate a SIGFPE. 683169689Skan * 684169689Skan * Clearing exceptions is necessary mainly to avoid IRQ13 bugs. We now 685169689Skan * depend on longjmp() restoring a usable state. Restoring the state 686169689Skan * or examining it might fail if we didn't clear exceptions. 687169689Skan * 688169689Skan * The error code chosen will be one of the FPE_... macros. It will be 689169689Skan * sent as the second argument to old BSD-style signal handlers and as 690169689Skan * "siginfo_t->si_code" (second argument) to SA_SIGINFO signal handlers. 691169689Skan * 692169689Skan * XXX the FP state is not preserved across signal handlers. So signal 693169689Skan * handlers cannot afford to do FP unless they preserve the state or 694169689Skan * longjmp() out. Both preserving the state and longjmp()ing may be 695169689Skan * destroyed by IRQ13 bugs. Clearing FP exceptions is not an acceptable 696169689Skan * solution for signals other than SIGFPE. 697169689Skan */ 698169689Skanvoid 699169689Skannpx_intr(dummy) 700169689Skan void *dummy; 701169689Skan{ 702169689Skan int code; 703169689Skan u_long cw; 704169689Skan struct intrframe *frame; 705169689Skan 706169689Skan if (npxproc == NULL || !npx_exists) { 707169689Skan printf("npxintr: npxproc = %p, curproc = %p, npx_exists = %d\n", 708169689Skan npxproc, curproc, npx_exists); 709169689Skan panic("npxintr from nowhere"); 710169689Skan } 711169689Skan if (npxproc != curproc) { 712169689Skan printf("npxintr: npxproc = %p, curproc = %p, npx_exists = %d\n", 713169689Skan npxproc, curproc, npx_exists); 714169689Skan panic("npxintr from non-current process"); 715169689Skan } 716169689Skan 717169689Skan outb(0xf0, 0); 718169689Skan fnstsw(&curpcb->pcb_savefpu.sv_ex_sw); 719169689Skan fnstcw(&cw); 720169689Skan fnclex(); 721169689Skan 722169689Skan /* 723169689Skan * Pass exception to process. 724169689Skan */ 725169689Skan frame = (struct intrframe *)&dummy; /* XXX */ 726169689Skan if ((ISPL(frame->if_cs) == SEL_UPL) || (frame->if_eflags & PSL_VM)) { 727169689Skan /* 728169689Skan * Interrupt is essentially a trap, so we can afford to call 729169689Skan * the SIGFPE handler (if any) as soon as the interrupt 730169689Skan * returns. 731169689Skan * 732169689Skan * XXX little or nothing is gained from this, and plenty is 733169689Skan * lost - the interrupt frame has to contain the trap frame 734169689Skan * (this is otherwise only necessary for the rescheduling trap 735169689Skan * in doreti, and the frame for that could easily be set up 736169689Skan * just before it is used). 737169689Skan */ 738169689Skan curproc->p_md.md_regs = INTR_TO_TRAPFRAME(frame); 739169689Skan /* 740169689Skan * Encode the appropriate code for detailed information on 741169689Skan * this exception. 742169689Skan */ 743169689Skan code = ENCODE(curpcb->pcb_savefpu.sv_ex_sw, cw); 744169689Skan trapsignal(curproc, SIGFPE, code); 745169689Skan } else { 746169689Skan /* 747169689Skan * Nested interrupt. These losers occur when: 748169689Skan * o an IRQ13 is bogusly generated at a bogus time, e.g.: 749169689Skan * o immediately after an fnsave or frstor of an 750169689Skan * error state. 751169689Skan * o a couple of 386 instructions after 752169689Skan * "fstpl _memvar" causes a stack overflow. 753169689Skan * These are especially nasty when combined with a 754169689Skan * trace trap. 755169689Skan * o an IRQ13 occurs at the same time as another higher- 756169689Skan * priority interrupt. 757169689Skan * 758169689Skan * Treat them like a true async interrupt. 759169689Skan */ 760169689Skan psignal(curproc, SIGFPE); 761169689Skan } 762169689Skan} 763169689Skan 764169689Skan/* 765169689Skan * Implement device not available (DNA) exception 766169689Skan * 767169689Skan * It would be better to switch FP context here (if curproc != npxproc) 768169689Skan * and not necessarily for every context switch, but it is too hard to 769169689Skan * access foreign pcb's. 770169689Skan */ 771169689Skanint 772169689Skannpxdna() 773169689Skan{ 774169689Skan if (!npx_exists) 775169689Skan return (0); 776169689Skan if (npxproc != NULL) { 777169689Skan printf("npxdna: npxproc = %p, curproc = %p\n", 778169689Skan npxproc, curproc); 779169689Skan panic("npxdna"); 780169689Skan } 781169689Skan stop_emulating(); 782169689Skan /* 783169689Skan * Record new context early in case frstor causes an IRQ13. 784169689Skan */ 785169689Skan npxproc = curproc; 786169689Skan curpcb->pcb_savefpu.sv_ex_sw = 0; 787169689Skan /* 788169689Skan * The following frstor may cause an IRQ13 when the state being 789169689Skan * restored has a pending error. The error will appear to have been 790169689Skan * triggered by the current (npx) user instruction even when that 791169689Skan * instruction is a no-wait instruction that should not trigger an 792169689Skan * error (e.g., fnclex). On at least one 486 system all of the 793169689Skan * no-wait instructions are broken the same as frstor, so our 794169689Skan * treatment does not amplify the breakage. On at least one 795169689Skan * 386/Cyrix 387 system, fnclex works correctly while frstor and 796169689Skan * fnsave are broken, so our treatment breaks fnclex if it is the 797169689Skan * first FPU instruction after a context switch. 798169689Skan */ 799169689Skan frstor(&curpcb->pcb_savefpu); 800169689Skan 801169689Skan return (1); 802169689Skan} 803169689Skan 804169689Skan/* 805169689Skan * Wrapper for fnsave instruction to handle h/w bugs. If there is an error 806169689Skan * pending, then fnsave generates a bogus IRQ13 on some systems. Force 807169689Skan * any IRQ13 to be handled immediately, and then ignore it. This routine is 808169689Skan * often called at splhigh so it must not use many system services. In 809169689Skan * particular, it's much easier to install a special handler than to 810169689Skan * guarantee that it's safe to use npxintr() and its supporting code. 811169689Skan */ 812169689Skanvoid 813169689Skannpxsave(addr) 814169689Skan struct save87 *addr; 815169689Skan{ 816169689Skan#ifdef SMP 817169689Skan 818169689Skan stop_emulating(); 819169689Skan fnsave(addr); 820169689Skan /* fnop(); */ 821169689Skan start_emulating(); 822169689Skan npxproc = NULL; 823169689Skan 824169689Skan#else /* SMP */ 825169689Skan 826169689Skan u_char icu1_mask; 827169689Skan u_char icu2_mask; 828169689Skan u_char old_icu1_mask; 829169689Skan u_char old_icu2_mask; 830169689Skan struct gate_descriptor save_idt_npxintr; 831169689Skan 832169689Skan disable_intr(); 833169689Skan old_icu1_mask = inb(IO_ICU1 + 1); 834169689Skan old_icu2_mask = inb(IO_ICU2 + 1); 835169689Skan save_idt_npxintr = idt[npx_intrno]; 836169689Skan outb(IO_ICU1 + 1, old_icu1_mask & ~(IRQ_SLAVE | npx0_imask)); 837169689Skan outb(IO_ICU2 + 1, old_icu2_mask & ~(npx0_imask >> 8)); 838169689Skan idt[npx_intrno] = npx_idt_probeintr; 839169689Skan enable_intr(); 840169689Skan stop_emulating(); 841169689Skan fnsave(addr); 842169689Skan fnop(); 843169689Skan start_emulating(); 844169689Skan npxproc = NULL; 845169689Skan disable_intr(); 846169689Skan icu1_mask = inb(IO_ICU1 + 1); /* masks may have changed */ 847169689Skan icu2_mask = inb(IO_ICU2 + 1); 848169689Skan outb(IO_ICU1 + 1, 849169689Skan (icu1_mask & ~npx0_imask) | (old_icu1_mask & npx0_imask)); 850169689Skan outb(IO_ICU2 + 1, 851169689Skan (icu2_mask & ~(npx0_imask >> 8)) 852169689Skan | (old_icu2_mask & (npx0_imask >> 8))); 853169689Skan idt[npx_intrno] = save_idt_npxintr; 854169689Skan enable_intr(); /* back to usual state */ 855169689Skan 856169689Skan#endif /* SMP */ 857169689Skan} 858169689Skan 859169689Skan#ifdef I586_CPU 860169689Skanstatic long 861169689Skantimezero(funcname, func) 862169689Skan const char *funcname; 863169689Skan void (*func) __P((void *buf, size_t len)); 864169689Skan 865169689Skan{ 866169689Skan void *buf; 867169689Skan#define BUFSIZE 1000000 868169689Skan long usec; 869169689Skan struct timeval finish, start; 870169689Skan 871169689Skan buf = malloc(BUFSIZE, M_TEMP, M_NOWAIT); 872169689Skan if (buf == NULL) 873169689Skan return (BUFSIZE); 874169689Skan microtime(&start); 875169689Skan (*func)(buf, BUFSIZE); 876169689Skan microtime(&finish); 877169689Skan usec = 1000000 * (finish.tv_sec - start.tv_sec) + 878169689Skan finish.tv_usec - start.tv_usec; 879169689Skan if (usec <= 0) 880169689Skan usec = 1; 881169689Skan if (bootverbose) 882169689Skan printf("%s bandwidth = %ld bytes/sec\n", 883169689Skan funcname, (long)(BUFSIZE * (int64_t)1000000 / usec)); 884169689Skan free(buf, M_TEMP); 885169689Skan return (usec); 886169689Skan} 887169689Skan#endif /* I586_CPU */ 888169689Skan 889169689Skanstatic device_method_t npx_methods[] = { 890169689Skan /* Device interface */ 891169689Skan DEVMETHOD(device_probe, npx_probe), 892169689Skan DEVMETHOD(device_attach, npx_attach), 893169689Skan DEVMETHOD(device_detach, bus_generic_detach), 894169689Skan DEVMETHOD(device_shutdown, bus_generic_shutdown), 895169689Skan DEVMETHOD(device_suspend, bus_generic_suspend), 896169689Skan DEVMETHOD(device_resume, bus_generic_resume), 897169689Skan 898169689Skan { 0, 0 } 899169689Skan}; 900169689Skan 901169689Skanstatic driver_t npx_driver = { 902169689Skan "npx", 903169689Skan npx_methods, 904169689Skan 1, /* no softc */ 905169689Skan}; 906169689Skan 907169689Skanstatic devclass_t npx_devclass; 908169689Skan 909169689Skan/* 910169689Skan * We prefer to attach to the root nexus so that the usual case (exception 16) 911169689Skan * doesn't describe the processor as being `on isa'. 912169689Skan */ 913169689SkanDRIVER_MODULE(npx, nexus, npx_driver, npx_devclass, 0, 0); 914169689Skan 915169689Skan#endif /* NNPX > 0 */ 916169689Skan