2011-03-30 12:46:40 +00:00
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/*
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* Far call, absolute indirect.
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* The argument is the offset.
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* We use a global structure for the jump params,
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* so this is *not* reentrant or thread safe.
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*/
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#include "mem.h"
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#define SSOVERRIDE BYTE $0x36
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#define CSOVERRIDE BYTE $0x2E
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GLOBL apmjumpstruct+0(SB), $8
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TEXT apmfarcall(SB), $0
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/*
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* We call push and pop ourselves.
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* As soon as we do the first push or pop,
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* we can't use FP anymore.
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*/
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MOVL off+4(FP), BX
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MOVL seg+0(FP), CX
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MOVL BX, apmjumpstruct+0(SB)
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MOVL CX, apmjumpstruct+4(SB)
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/* load necessary registers from Ureg */
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MOVL ureg+8(FP), DI
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MOVL 28(DI), AX
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MOVL 16(DI), BX
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MOVL 24(DI), CX
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MOVL 20(DI), DX
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/* save registers, segments */
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PUSHL DS
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PUSHL ES
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PUSHL FS
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PUSHL GS
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PUSHL BP
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PUSHL DI
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/*
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* paranoia: zero the segments, since it's the
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* BIOS's responsibility to initialize them.
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* (trick picked up from Linux driver).
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2013-09-16 14:23:51 +00:00
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*/
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2011-03-30 12:46:40 +00:00
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PUSHL DX
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XORL DX, DX
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PUSHL DX
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POPL DS
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PUSHL DX
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POPL ES
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PUSHL DX
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POPL FS
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PUSHL DX
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POPL GS
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POPL DX
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/*
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* The actual call.
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*/
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CSOVERRIDE; BYTE $0xFF; BYTE $0x1D
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LONG $apmjumpstruct+0(SB)
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/* restore segments, registers */
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POPL DI
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POPL BP
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POPL GS
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POPL FS
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POPL ES
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POPL DS
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PUSHFL
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POPL 64(DI)
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/* store interesting registers back in Ureg */
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MOVL AX, 28(DI)
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MOVL BX, 16(DI)
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MOVL CX, 24(DI)
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MOVL DX, 20(DI)
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MOVL SI, 4(DI)
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PUSHFL
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POPL AX
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ANDL $1, AX /* carry flag */
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RET
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