#include <vm8086.h>
#include <modules.h>
#include <hal_proc.h>
+#include <semaphore.h>
// === CONSTANTS ===
#define VM8086_MAGIC_CS 0xFFFF
// === GLOBALS ===
MODULE_DEFINE(0, 0x100, VM8086, VM8086_Install, NULL, NULL);
tMutex glVM8086_Process;
+tSemaphore gVM8086_TaskComplete;
+tSemaphore gVM8086_TasksToDo;
tPID gVM8086_WorkerPID;
tTID gVM8086_CallingThread;
tVM8086 volatile * volatile gpVM8086_State = (void*)-1; // Set to -1 to avoid race conditions
// Map ROM Area
for(i=0xA0;i<0x100;i++) {
MM_Map( i * 0x1000, i * 0x1000 );
- // MM_SetFlags( i * 0x1000, MM_PFLAG_RO, MM_PFLAG_RO ); // Set Read Only
}
Log_Debug("VM8086", "ROM area mapped");
MM_Map( 0, 0 ); // IVT / BDA
for(i=1;i<0x9F;i++) {
MM_Map( i * 0x1000, i * 0x1000 );
MM_DerefPhys( i * 0x1000 ); // Above
- if(MM_GetRefCount(i*0x1000))
+ while(MM_GetRefCount(i*0x1000))
MM_DerefPhys( i * 0x1000 ); // Phys setup
}
MM_Map( 0x9F000, 0x9F000 ); // Stack / EBDA
gpVM8086_State->DS = Regs->ds; gpVM8086_State->ES = Regs->es;
gpVM8086_State = NULL;
// Wake the caller
- Threads_WakeTID(gVM8086_CallingThread);
+ Semaphore_Signal(&gVM8086_TaskComplete, 1);
}
//Log_Log("VM8086", "Waiting for something to do");
__asm__ __volatile__ ("sti");
- // Wait for a new task
- while(!gpVM8086_State) {
- Threads_Sleep();
- //Log_Log("VM8086", "gpVM8086_State = %p", gpVM8086_State);
- }
+ Semaphore_Wait(&gVM8086_TasksToDo, 1);
//Log_Log("VM8086", "We have a task (%p)", gpVM8086_State);
Regs->esp -= 2; *(Uint16*volatile)( (Regs->ss<<4) + (Regs->esp&0xFFFF) ) = VM8086_MAGIC_CS;
{
State->IP = *(Uint16*)(KERNEL_BASE+4*Interrupt);
State->CS = *(Uint16*)(KERNEL_BASE+4*Interrupt+2);
+
+// Log_Debug("VM8086", "Software interrupt %i to %04x:%04x", Interrupt, State->CS, State->IP);
Mutex_Acquire( &glVM8086_Process );
gpVM8086_State = State;
gVM8086_CallingThread = Threads_GetTID();
- Threads_WakeTID( gVM8086_WorkerPID );
- Threads_Sleep();
- while( gpVM8086_State != NULL ) Threads_Sleep();
+ Semaphore_Signal(&gVM8086_TasksToDo, 1);
+
+ Semaphore_Wait(&gVM8086_TaskComplete, 1);
Mutex_Release( &glVM8086_Process );
}