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Add IRQ acknowledge handler for internal IRQs.

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Change DPMI asynchronous event handling.
Always use alternate stack in DPMI relays and check for pending events
after original stack has been restored.
This commit is contained in:
Jukka Heinonen 2003-06-23 03:35:51 +00:00 committed by Alexandre Julliard
parent c782721943
commit 76f93fb6bc
4 changed files with 108 additions and 45 deletions
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2
dlls/winedos/dosexe.h
View file

@ -105,6 +105,8 @@ extern void WINAPI MZ_RunInThread( PAPCFUNC proc, ULONG_PTR arg );
extern BOOL DOSVM_IsWin16(void);
/* dosvm.c */
extern void DOSVM_SendQueuedEvents( CONTEXT86 * );
extern void WINAPI DOSVM_AcknowledgeIRQ( CONTEXT86 * );
extern INT WINAPI DOSVM_Enter( CONTEXT86 *context );
extern void WINAPI DOSVM_Wait( CONTEXT86 * );
extern DWORD WINAPI DOSVM_Loop( HANDLE hThread );

75
dlls/winedos/dosvm.c
View file

@ -159,9 +159,23 @@ static void DOSVM_SendOneEvent( CONTEXT86 *context )
/* Callback event. */
TRACE( "Dispatching callback event.\n" );
LeaveCriticalSection(&qcrit);
(*event->relay)( context, event->data );
EnterCriticalSection(&qcrit);
if (ISV86(context))
{
/*
* Call relay immediately in real mode.
*/
LeaveCriticalSection(&qcrit);
(*event->relay)( context, event->data );
EnterCriticalSection(&qcrit);
}
else
{
/*
* Force return to relay code. We do not want to
* call relay directly because we may be inside a signal handler.
*/
DOSVM_BuildCallFrame( context, event->relay, event->data );
}
free(event);
}
@ -171,23 +185,30 @@ static void DOSVM_SendOneEvent( CONTEXT86 *context )
/***********************************************************************
* DOSVM_SendQueuedEvents
*
* As long as interrupts are enabled, process all pending events
* that are not blocked by currently active event.
* As long as context instruction pointer stays unmodified,
* process all pending events that are not blocked by currently
* active event.
*
* This routine assumes that caller has already cleared TEB.vm86_pending
* and checked that interrupts are enabled.
*/
static void DOSVM_SendQueuedEvents( CONTEXT86 *context )
{
void DOSVM_SendQueuedEvents( CONTEXT86 *context )
{
DWORD old_cs = context->SegCs;
DWORD old_ip = context->Eip;
EnterCriticalSection(&qcrit);
TRACE( "Called in %s mode %s events pending (time=%ld)\n",
ISV86(context) ? "real" : "protected",
DOSVM_HasPendingEvents() ? "with" : "without",
GetTickCount() );
TRACE( "cs:ip=%04lx:%08lx, ss:sp=%04lx:%08lx\n",
TRACE( "cs:ip=%04lx:%08lx, ss:sp=%04lx:%08lx\n",
context->SegCs, context->Eip, context->SegSs, context->Esp);
while (DOSVM_HasPendingEvents() &&
(ISV86(context) ?
(context->EFlags & VIF_MASK) : NtCurrentTeb()->dpmi_vif))
while (context->SegCs == old_cs &&
context->Eip == old_ip &&
DOSVM_HasPendingEvents())
{
DOSVM_SendOneEvent(context);
@ -199,6 +220,17 @@ static void DOSVM_SendQueuedEvents( CONTEXT86 *context )
NtCurrentTeb()->vm86_pending = 0;
}
if (!ISV86(context) && context->SegCs == old_cs && context->Eip == old_ip)
{
/*
* Routine was called from DPMI but there was nothing to do.
* We force a dummy relay call here so that we don't get a race
* if signals are unblocked when we return to DPMI application.
*/
TRACE( "Called but there was nothing to do, calling NULL relay.\n" );
DOSVM_BuildCallFrame( context, NULL, NULL );
}
if (DOSVM_HasPendingEvents())
{
/*
@ -619,6 +651,27 @@ void WINAPI DOSVM_QueueEvent( INT irq, INT priority, DOSRELAY relay, LPVOID data
#endif
/**********************************************************************
* DOSVM_AcknowledgeIRQ
*
* This routine should be called by all internal IRQ handlers.
*/
void WINAPI DOSVM_AcknowledgeIRQ( CONTEXT86 *context )
{
/*
* Send EOI to PIC.
*/
DOSVM_PIC_ioport_out( 0x20, 0x20 );
/*
* Protected mode IRQ handlers are supposed
* to turn VIF flag on before they return.
*/
if (!ISV86(context))
NtCurrentTeb()->dpmi_vif = 1;
}
/**********************************************************************
* DllMain (DOSVM.Init)
*/

3
dlls/winedos/int09.c
View file

@ -206,7 +206,8 @@ void WINAPI DOSVM_Int09Handler( CONTEXT86 *context )
DOSVM_Int16AddChar(0, scan);
}
}
DOSVM_PIC_ioport_out( 0x20, 0x20 ); /* send EOI */
DOSVM_AcknowledgeIRQ( context );
}
static void KbdRelay( CONTEXT86 *context, void *data )

73
dlls/winedos/relay.c
View file

@ -31,8 +31,7 @@ WINE_DEFAULT_DEBUG_CHANNEL(int);
#define RELAY_MAGIC 0xabcdef00
/*
* Memory block for temporary 16-bit stacks used when
* 32-bit code calls relay.
* Memory block for temporary 16-bit stacks used with relay calls.
*/
typedef struct {
DWORD inuse; /* non-zero if stack block is in use */
@ -62,9 +61,8 @@ static RELAY_Stack16 *RELAY_GetPointer( DWORD offset )
/**********************************************************************
* RELAY_MakeShortContext
*
* If context is using 32-bit stack or code segment, allocate
* 16-bit stack, make stack pointer point to this stack and
* make code pointer point to stub that restores everything.
* Allocate separate 16-bit stack, make stack pointer point to this
* stack and make code pointer point to stub that restores everything.
* So, after this routine, SS and CS are guaranteed to be 16-bit.
*
* Note: This might be called from signal handler, so the stack
@ -72,33 +70,30 @@ static RELAY_Stack16 *RELAY_GetPointer( DWORD offset )
*/
static void RELAY_MakeShortContext( CONTEXT86 *context )
{
if (IS_SELECTOR_32BIT(context->SegCs) || IS_SELECTOR_32BIT(context->SegSs))
{
DWORD offset = offsetof(RELAY_Stack16, stack_top);
RELAY_Stack16 *stack = RELAY_GetPointer( 0 );
DWORD offset = offsetof(RELAY_Stack16, stack_top);
RELAY_Stack16 *stack = RELAY_GetPointer( 0 );
while (stack->inuse && offset < DOSVM_RELAY_DATA_SIZE) {
stack++;
offset += sizeof(RELAY_Stack16);
}
if (offset >= DOSVM_RELAY_DATA_SIZE)
ERR( "Too many nested interrupts!\n" );
stack->inuse = 1;
stack->eip = context->Eip;
stack->seg_cs = context->SegCs;
stack->esp = context->Esp;
stack->seg_ss = context->SegSs;
stack->stack_bottom = RELAY_MAGIC;
stack->stack_top = RELAY_MAGIC;
context->SegSs = DOSVM_dpmi_segments->relay_data_sel;
context->Esp = offset;
context->SegCs = DOSVM_dpmi_segments->relay_code_sel;
context->Eip = 3;
while (stack->inuse && offset < DOSVM_RELAY_DATA_SIZE) {
stack++;
offset += sizeof(RELAY_Stack16);
}
if (offset >= DOSVM_RELAY_DATA_SIZE)
ERR( "Too many nested interrupts!\n" );
stack->inuse = 1;
stack->eip = context->Eip;
stack->seg_cs = context->SegCs;
stack->esp = context->Esp;
stack->seg_ss = context->SegSs;
stack->stack_bottom = RELAY_MAGIC;
stack->stack_top = RELAY_MAGIC;
context->SegSs = DOSVM_dpmi_segments->relay_data_sel;
context->Esp = offset;
context->SegCs = DOSVM_dpmi_segments->relay_code_sel;
context->Eip = 3;
}
@ -112,7 +107,8 @@ static void __stdcall RELAY_RelayStub( DOSRELAY proc,
unsigned char *args,
void *context )
{
proc( (CONTEXT86*)context, *(LPVOID *)args );
if (proc)
proc( (CONTEXT86*)context, *(LPVOID *)args );
}
@ -136,6 +132,17 @@ void DOSVM_RelayHandler( CONTEXT86 *context )
ERR( "Stack corrupted!\n" );
stack->inuse = 0;
/*
* We have now restored original stack and instruction pointers.
* Because signals are blocked here, this is a safe place to
* check for pending events before we return to application context.
*/
if (NtCurrentTeb()->vm86_pending && NtCurrentTeb()->dpmi_vif)
{
NtCurrentTeb()->vm86_pending = 0;
DOSVM_SendQueuedEvents( context );
}
}
@ -182,7 +189,7 @@ void DOSVM_SaveCallFrame( CONTEXT86 *context, STACK16FRAME *frame )
void DOSVM_RestoreCallFrame( CONTEXT86 *context, STACK16FRAME *frame )
{
/*
* Make sure that CS and SS are 16-bit.
* Allocate separate stack for relay call.
*/
RELAY_MakeShortContext( context );
@ -226,7 +233,7 @@ void DOSVM_BuildCallFrame( CONTEXT86 *context, DOSRELAY relay, LPVOID data )
WORD code_sel = DOSVM_dpmi_segments->relay_code_sel;
/*
* Make sure that CS and SS are 16-bit.
* Allocate separate stack for relay call.
*/
RELAY_MakeShortContext( context );