; $Id$

;; @file

; TRPM - Host Context Ring-0

;

;

; Copyright (C) 2006-2007 Sun Microsystems, Inc.

;

; This file is part of VirtualBox Open Source Edition (OSE), as

; available from http://www.virtualbox.org. This file is free software;

; you can redistribute it and/or modify it under the terms of the GNU

; General Public License (GPL) as published by the Free Software

; Foundation, in version 2 as it comes in the "COPYING" file of the

; VirtualBox OSE distribution. VirtualBox OSE is distributed in the

; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.

;

; Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa

; Clara, CA 95054 USA or visit http://www.sun.com if you need

; additional information or have any questions.

;

;*******************************************************************************

;* Header Files *

;*******************************************************************************

%include "VBox/asmdefs.mac"

%include "VBox/x86.mac"

BEGINCODE

align 16

;;

; Calls the interrupt gate as if we received an interrupt while in Ring-0.

;

; @param uIP x86:[ebp+8] msc:rcx gcc:rdi The interrupt gate IP.

; @param SelCS x86:[ebp+12] msc:dx gcc:si The interrupt gate CS.

; @param RSP msc:r8 gcc:rdx The interrupt gate RSP. ~0 if no stack switch should take place. (only AMD64)

;DECLASM(void) trpmR0DispatchHostInterrupt(RTR0UINTPTR uIP, RTSEL SelCS, RTR0UINTPTR RSP);

BEGINPROC trpmR0DispatchHostInterrupt

push xBP

mov xBP, xSP

%ifdef RT_ARCH_AMD64

mov r11, rsp ; save the RSP for the iret frame.

and rsp, 0fffffffffffffff0h ; align the stack. (do it unconditionally saves some jump mess)

; switch stack?

%ifdef ASM_CALL64_MSC

cmp r8, 0ffffffffffffffffh

je .no_stack_switch

mov rsp, r8

%else

cmp rdx, 0ffffffffffffffffh

je .no_stack_switch

mov rsp, rdx

%endif

.no_stack_switch:

; create the iret frame

push 0 ; SS

push r11 ; RSP

pushfq ; RFLAGS

and dword [rsp], ~X86_EFL_IF

mov ax, cs

push rax ; CS

lea r10, [.return wrt rip] ; RIP

push r10

; create the retf frame

%ifdef ASM_CALL64_MSC

movzx rdx, dx

cmp rdx, r11

je .dir_jump

push rdx

push rcx

%else

movzx rsi, si

cmp rsi, r11

je .dir_jump

push rsi

push rdi

%endif

; dispatch it

db 048h

retf

; dispatch it by a jmp (don't mess up the IST stack)

.dir_jump:

%ifdef ASM_CALL64_MSC

jmp rcx

%else

jmp rdi

%endif

%else ; 32-bit:

mov ecx, [ebp + 8] ; uIP

movzx edx, word [ebp + 12] ; SelCS

; create the iret frame

pushfd ; EFLAGS

and dword [esp], ~X86_EFL_IF

push cs ; CS

push .return ; EIP

; create the retf frame

push edx

push ecx

; dispatch it!

retf

%endif

.return:

cli

leave

ret

ENDPROC trpmR0DispatchHostInterrupt

;;

; Issues a software interrupt to the specified interrupt vector.

;

; @param uActiveVector x86:[esp+4] msc:rcx gcc:rdi The vector number.

;

;DECLASM(void) trpmR0DispatchHostInterruptSimple(RTUINT uActiveVector);

BEGINPROC trpmR0DispatchHostInterruptSimple

%ifdef RT_ARCH_X86

mov eax, [esp + 4]

jmp dword [.jmp_table + eax * 4]

%else

lea r9, [.jmp_table wrt rip]

%ifdef ASM_CALL64_MSC

jmp qword [r9 + rcx * 8]

%else

jmp qword [r9 + rdi * 8]

%endif

%endif

.jmp_table:

%assign i 0

%rep 256

RTCCPTR_DEF .int_ %+ i

%assign i i+1

%endrep

%assign i 0

%rep 256

ALIGNCODE(4)

.int_ %+ i:

int i

ret

%assign i i+1

%endrep

ENDPROC trpmR0DispatchHostInterruptSimple