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Annotation of Gnu-Mach/i386/pc/rv86/rv86_reflect_irq.S, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Copyright (c) 1995 The University of Utah and
        !             3:  * the Computer Systems Laboratory at the University of Utah (CSL).
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Permission to use, copy, modify and distribute this software is hereby
        !             7:  * granted provided that (1) source code retains these copyright, permission,
        !             8:  * and disclaimer notices, and (2) redistributions including binaries
        !             9:  * reproduce the notices in supporting documentation, and (3) all advertising
        !            10:  * materials mentioning features or use of this software display the following
        !            11:  * acknowledgement: ``This product includes software developed by the
        !            12:  * Computer Systems Laboratory at the University of Utah.''
        !            13:  *
        !            14:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
        !            15:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
        !            16:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            17:  *
        !            18:  * CSL requests users of this software to return to [email protected] any
        !            19:  * improvements that they make and grant CSL redistribution rights.
        !            20:  *
        !            21:  *      Author: Bryan Ford, University of Utah CSL
        !            22:  */
        !            23: 
        !            24: #include <mach/machine/asm.h>
        !            25: #include <mach/machine/eflags.h>
        !            26: 
        !            27: #include "trap.h"
        !            28: #include "trap_asm.h"
        !            29: #include "pc_asm.h"
        !            30: #include "i386_asm.h"
        !            31: 
        !            32: /*
        !            33:  * Define a set of interrupt handlers to reflect interrupts to v86 mode.
        !            34:  */
        !            35: 
        !            36:        .text
        !            37: 
        !            38: #define master_base    0x08
        !            39: #define slave_base     0x70
        !            40: 
        !            41: #define irq(pic,picnum,irqnum)                         \
        !            42: ENTRY(rv86_reflect_irq##irqnum)                                ;\
        !            43:        pushl   $pic##_base+picnum                      ;\
        !            44:        pushl   $0x80000000+irqnum /* (for debug) */    ;\
        !            45:        jmp     allintrs
        !            46: 
        !            47: #include "irq_list.h"
        !            48: 
        !            49: 
        !            50: allintrs:
        !            51:        pusha
        !            52:        pushl   %ds
        !            53:        pushl   %es
        !            54:        pushl   %fs
        !            55:        pushl   %gs
        !            56: 
        !            57:        /* Load the normal kernel segment registers.  */
        !            58:        movw    %ss,%ax
        !            59:        movw    %ax,%ds
        !            60:        movw    %ax,%es
        !            61: 
        !            62:        /* See if we came from v86 mode.  */
        !            63:        testl   $EFL_VM,TR_EFLAGS(%esp)
        !            64:        jnz     int_from_v86
        !            65: 
        !            66:        movl    TR_ERR(%esp),%eax
        !            67:        pushl   $dummy_rcd
        !            68:        pushl   %eax
        !            69:        call    EXT(rv86_real_int)
        !            70:        addl    $2*4,%esp
        !            71: 
        !            72:        popl    %gs
        !            73:        popl    %fs
        !            74:        popl    %es
        !            75:        popl    %ds
        !            76:        popa
        !            77:        addl    $2*4,%esp
        !            78:        iret
        !            79: 
        !            80: int_from_v86:
        !            81: 
        !            82:        /* Save the v86 stack pointer before handling the interrupt.
        !            83:           We need this in order to handle recursive reflected interrupts
        !            84:           possibly interspersed with protected-mode interrupts.  */
        !            85:        movl    EXT(rv86_usp),%esi
        !            86:        movl    EXT(rv86_usp)+4,%edi
        !            87:        movl    EXT(real_tss)+TSS_ESP0,%ebx
        !            88: 
        !            89:        movl    TR_ESP(%esp),%eax
        !            90:        subw    $6,%ax  /* allocate a real-mode interrupt stack frame.  */
        !            91:        movl    %eax,EXT(rv86_usp)
        !            92:        movl    TR_SS(%esp),%eax
        !            93:        movw    %ax,EXT(rv86_usp)+4
        !            94: 
        !            95:        movl    TR_ERR(%esp),%eax
        !            96:        pushl   $dummy_rcd
        !            97:        pushl   %eax
        !            98:        call    EXT(rv86_real_int)
        !            99:        addl    $2*4,%esp
        !           100: 
        !           101:        movl    %esi,EXT(rv86_usp)
        !           102:        movl    %edi,EXT(rv86_usp)+4
        !           103:        movl    %ebx,EXT(real_tss)+TSS_ESP0
        !           104: 
        !           105:        addl    $4*4,%esp
        !           106:        popa
        !           107:        addl    $2*4,%esp
        !           108:        iret
        !           109: 
        !           110:        /* Dummy real_call_data structure (always all zero)
        !           111:           to use when reflecting hardware interrupts.  */
        !           112:        .comm   dummy_rcd,RCD_SIZE
        !           113: 

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