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Annotation of kernel/machdep/i386/bios.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * Copyright 1994 NeXT Computer, Inc.
        !            27:  * All rights reserved.
        !            28:  */
        !            29: 
        !            30: #import <kern/thread.h>
        !            31: 
        !            32: #import <machdep/i386/bios.h>
        !            33: #import <machdep/i386/seg.h>
        !            34: 
        !            35: /*
        !            36:  * Maintain the recover field in the thread_t structure
        !            37:  */
        !            38: static inline void
        !            39: set_recover(int (*vector)())
        !            40: {
        !            41:     current_thread()->recover = (vm_offset_t)vector;
        !            42:     return;
        !            43: }
        !            44: 
        !            45: static inline void
        !            46: clear_recover()
        !            47: {
        !            48:     current_thread()->recover = 0;
        !            49: }
        !            50: 
        !            51: 
        !            52: 
        !            53: int volatile
        !            54: bios32(biosBuf_t *bb)
        !            55: {
        !            56:     static unsigned long       ebp;
        !            57:     static unsigned long       ss;
        !            58:     static boolean_t           initialized;
        !            59:     static lock_t              lock;
        !            60:     
        !            61: #if    NOTYET                  // this is failing on the NEC right now
        !            62:     if (!initialized) {
        !            63:        lock_init(lock, TRUE);
        !            64:        initialized = TRUE;
        !            65:     }
        !            66:     
        !            67:     lock_write(lock);
        !            68:     set_recover(&&do_fault);
        !            69: 
        !            70:     /* Save stack pointer. */
        !            71:     asm volatile("mov %%ebp, %0"
        !            72:                 : "=m" (ebp)
        !            73:                 : /* no inputs */);
        !            74:     asm volatile("mov %%ss, %0"
        !            75:                 : "=m" (ss)
        !            76:                 : /* no inputs */);
        !            77: #endif NOTYET
        !            78:     _bios32(bb);
        !            79: 
        !            80: 
        !            81: #if    NOTYET
        !            82:     /* Reload DS, ES, FS, GS and SS. */
        !            83:     asm volatile("movw %0, %%ax;"
        !            84:                  "mov %%ax, %%ds; mov %%ax, %%es;"
        !            85:                 "mov %1, %%ax; mov %%ax, %%fs;"
        !            86:                 "mov %2, %%ax; mov %%ax, %%gs;"
        !            87:                 : /* no outputs */
        !            88:                 : "i" (KDS_SEL), "i" (LDATA_SEL), "i" (0));
        !            89:     asm volatile("mov %0, %%ss"
        !            90:                 : /* no inputs */
        !            91:                 : "m" (ss));
        !            92:     /* Restore stack pointer. */
        !            93:     asm volatile("mov %0, %%ebp"
        !            94:                 : /* no outputs */
        !            95:                 : "m" (ebp));
        !            96:     clear_recover();
        !            97:     lock_done(lock);
        !            98: #endif NOTYET
        !            99:     return 0;
        !           100: #if    NOTYET
        !           101: do_fault:
        !           102:     /* Reload DS, ES, FS, GS and SS. */
        !           103:     asm volatile("movw %0, %%ax;"
        !           104:                  "mov %%ax, %%ds; mov %%ax, %%es;"
        !           105:                 "mov %1, %%ax; mov %%ax, %%fs;"
        !           106:                 "mov %2, %%ax; mov %%ax, %%gs;"
        !           107:                 : /* no outputs */
        !           108:                 : "i" (KDS_SEL), "i" (LDATA_SEL), "i" (0));
        !           109:     asm volatile("mov %0, %%ss"
        !           110:                 : /* no inputs */
        !           111:                 : "m" (ss));
        !           112:     /* Restore stack pointer. */
        !           113:     asm volatile("mov %0, %%ebp"
        !           114:                 : /* no outputs */
        !           115:                 : "m" (ebp));
        !           116:     clear_recover();
        !           117:     lock_done(lock);
        !           118:     return -1;
        !           119: #endif NOTYET
        !           120: }

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