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Annotation of kernel/machdep/i386/bios.c, revision 1.1.1.1

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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