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Annotation of kernel/machdep/i386/dbl_fault.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 (c) 1993 NeXT Computer, Inc.
        !            27:  *
        !            28:  * Handling of double faults.
        !            29:  *
        !            30:  * HISTORY
        !            31:  *
        !            32:  * 12 May 1993 ? at NeXT
        !            33:  *     Created.
        !            34:  */
        !            35: 
        !            36: #import <mach/mach_types.h>
        !            37: 
        !            38: #import <architecture/i386/table.h>
        !            39: 
        !            40: #import <machdep/i386/trap.h>
        !            41: #import <machdep/i386/idt.h>
        !            42: #import <machdep/i386/desc_inline.h>
        !            43: #import <machdep/i386/table_inline.h>
        !            44: 
        !            45: tss_t                  dbf_tss;
        !            46: thread_saved_state_t   dbf_state;
        !            47: #define DBF_STACK_SIZE 1024
        !            48: unsigned char          dbf_stack[DBF_STACK_SIZE];
        !            49: 
        !            50: void                   dbf_handler_(void);
        !            51: 
        !            52: void
        !            53: dbf_init(void)
        !            54: {
        !            55:     tss_t      *tss = &dbf_tss;
        !            56:     
        !            57:     tss->cr3 = pmap_kernel()->cr3;
        !            58:     tss->esp0 = (unsigned int)&dbf_stack[DBF_STACK_SIZE];
        !            59:     tss->ss0 = KDS_SEL;
        !            60:     tss->esp = tss->ebp = tss->esp0;
        !            61:     tss->ss = KDS_SEL;
        !            62:     tss->eip = (unsigned int)dbf_handler_;
        !            63:     tss->cs = KCS_SEL;
        !            64:     tss->ds = KDS_SEL;
        !            65:     tss->es = KDS_SEL;
        !            66:     tss->io_bmap = TSS_SIZE(0);
        !            67:     
        !            68:     map_tss(
        !            69:            sel_to_gdt_entry(DBLFLT_SEL),
        !            70:                (vm_offset_t)&dbf_tss + KERNEL_LINEAR_BASE,
        !            71:                    (vm_size_t)TSS_SIZE(0));
        !            72:                    
        !            73:     make_task_gate(
        !            74:            (task_gate_t *)&idt[T_DOUBLE_FAULT],
        !            75:                DBLFLT_SEL, 0, KERN_PRIV);
        !            76: }
        !            77: 
        !            78: void
        !            79: dbf_handler(
        !            80:     err_code_t         err
        !            81: )
        !            82: {
        !            83:     thread_saved_state_t       *state = &dbf_state;
        !            84:     tss_t                      *tss = current_thread()->pcb->tss;
        !            85: 
        !            86:     while (TRUE) {
        !            87:        state->trapno = T_DOUBLE_FAULT;
        !            88:        
        !            89:        state->frame.err = err;
        !            90:        state->frame.eip = tss->eip;
        !            91:        state->frame.cs = tss->cs;
        !            92:        state->frame.eflags = tss->eflags;
        !            93:        
        !            94:        state->regs.eax = tss->eax;
        !            95:        state->regs.ecx = tss->ecx;
        !            96:        state->regs.edx = tss->edx;
        !            97:        state->regs.ebx = tss->ebx;
        !            98:        state->regs.ebp = tss->ebp;
        !            99:        state->regs.esi = tss->esi;
        !           100:        state->regs.edi = tss->edi;
        !           101:        state->regs.ds = tss->ds;
        !           102:        state->regs.es = tss->es;
        !           103:        state->regs.fs = tss->fs;
        !           104:        state->regs.gs = tss->gs;
        !           105:        
        !           106:        kernel_trap(state);
        !           107:     }
        !           108: }

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