apmjump.s

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    1 /*
    2  * Far call, absolute indirect.
    3  * The argument is the offset.
    4  * We use a global structure for the jump params,
    5  * so this is *not* reentrant or thread safe.
    6  */
    7 
    8 #include "mem.h"
    9 
   10 #define SSOVERRIDE      BYTE $0x36
   11 #define CSOVERRIDE      BYTE $0x2E
   12 #define RETF            BYTE $0xCB
   13 
   14 GLOBL   apmjumpstruct+0(SB), $8
   15 
   16 TEXT fortytwo(SB), $0
   17         MOVL    $42, AX
   18         RETF
   19 
   20 TEXT getcs(SB), $0
   21         PUSHL   CS
   22         POPL    AX
   23         RET
   24 
   25 TEXT apmfarcall(SB), $0
   26         /*
   27          * We call push and pop ourselves.
   28          * As soon as we do the first push or pop,
   29          * we can't use FP anymore.
   30          */
   31         MOVL    off+4(FP), BX
   32         MOVL    seg+0(FP), CX
   33         MOVL    BX, apmjumpstruct+0(SB)
   34         MOVL    CX, apmjumpstruct+4(SB)
   35 
   36         /* load necessary registers from Ureg */
   37         MOVL    ureg+8(FP), DI
   38         MOVL    28(DI), AX
   39         MOVL    16(DI), BX
   40         MOVL    24(DI), CX
   41         MOVL    20(DI), DX
   42 
   43         /* save registers, segments */
   44         PUSHL   DS
   45         PUSHL   ES
   46         PUSHL   FS
   47         PUSHL   GS
   48         PUSHL   BP
   49         PUSHL   DI
   50 
   51         /*
   52          * paranoia: zero the segments, since it's the
   53          * BIOS's responsibility to initialize them.
   54          * (trick picked up from Linux driver).
   55         PUSHL   DX
   56         XORL    DX, DX
   57         PUSHL   DX
   58         POPL    DS
   59         PUSHL   DX
   60         POPL    ES
   61         PUSHL   DX
   62         POPL    FS
   63         PUSHL   DX
   64         POPL    GS
   65         POPL    DX
   66          */
   67 
   68         PUSHL   $APMDSEG
   69         POPL    DS
   70 
   71         /*
   72          * The actual call.
   73          */
   74         CSOVERRIDE; BYTE $0xFF; BYTE $0x1D
   75         LONG $apmjumpstruct+0(SB)
   76 
   77         /* restore segments, registers */
   78         POPL    DI
   79         POPL    BP
   80         POPL    GS
   81         POPL    FS
   82         POPL    ES
   83         POPL    DS
   84 
   85         PUSHFL
   86         POPL    64(DI)
   87 
   88         /* store interesting registers back in Ureg */
   89         MOVL    AX, 28(DI)
   90         MOVL    BX, 16(DI)
   91         MOVL    CX, 24(DI)
   92         MOVL    DX, 20(DI)
   93         MOVL    SI, 4(DI)
   94 
   95         PUSHFL
   96         POPL    AX
   97         ANDL    $1, AX  /* carry flag */
   98         RET

Cache object: 61514cd364d89b84630ef8b741436a6c

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FreeBSD/Linux Kernel Cross Reference sys/pc/apmjump.s

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sys/pc/apmjump.s