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vdmint21.c File Reference

#include "ki.h"
#include "vdmntos.h"

Go to the source code of this file.

Defines

#define IDT_ACCESS_DPL_USER   0x6000
#define IDT_ACCESS_TYPE_386_TRAP   0xF00
#define IDT_ACCESS_TYPE_286_TRAP   0x700
#define IDT_ACCESS_PRESENT   0x8000
#define LDT_MASK   4
#define KiLoadInt21Entry()   KeGetPcr()->IDT[0x21] = PsGetCurrentProcess()->Pcb.Int21Descriptor

Functions

BOOLEAN Ki386GetSelectorParameters (IN USHORT Selector, OUT PULONG Flags, OUT PULONG Base, OUT PULONG Limit)
VOID Ki386LoadTargetInt21Entry (IN PKIPI_CONTEXT SignalDone, IN PVOID Parameter1, IN PVOID Parameter2, IN PVOID Parameter3)
NTSTATUS Ke386SetVdmInterruptHandler (PKPROCESS Process, ULONG Interrupt, USHORT Selector, ULONG Offset, BOOLEAN Gate32)

Define Documentation

#define IDT_ACCESS_DPL_USER   0x6000
 

Definition at line 30 of file vdmint21.c.

Referenced by Ke386SetVdmInterruptHandler().

#define IDT_ACCESS_PRESENT   0x8000
 

Definition at line 33 of file vdmint21.c.

Referenced by Ke386SetVdmInterruptHandler().

#define IDT_ACCESS_TYPE_286_TRAP   0x700
 

Definition at line 32 of file vdmint21.c.

Referenced by Ke386SetVdmInterruptHandler().

#define IDT_ACCESS_TYPE_386_TRAP   0xF00
 

Definition at line 31 of file vdmint21.c.

Referenced by Ke386SetVdmInterruptHandler().

 
#define KiLoadInt21Entry (   )     KeGetPcr()->IDT[0x21] = PsGetCurrentProcess()->Pcb.Int21Descriptor
 

Definition at line 60 of file vdmint21.c.

Referenced by Ke386SetVdmInterruptHandler(), and Ki386LoadTargetInt21Entry().

#define LDT_MASK   4
 

Definition at line 34 of file vdmint21.c.

Referenced by Ke386SetVdmInterruptHandler().

Function Documentation

NTSTATUS Ke386SetVdmInterruptHandler (  PKPROCESS  Process,
ULONG  Interrupt,
USHORT  Selector,
ULONG  Offset,
BOOLEAN  Gate32
) 
 

Definition at line 64 of file vdmint21.c.

References _KPROCESS::ActiveProcessors, IDT_ACCESS_DPL_USER, IDT_ACCESS_PRESENT, IDT_ACCESS_TYPE_286_TRAP, IDT_ACCESS_TYPE_386_TRAP, KeGetCurrentPrcb, Ki386GetSelectorParameters(), Ki386LoadTargetInt21Entry(), KiIpiSendPacket(), KiIpiStallOnPacketTargets(), KiLoadInt21Entry, KiLockContextSwap, KiUnlockContextSwap, LDT_MASK, NULL, Offset, and USHORT.

Referenced by NtVdmControl(). 

00074                    :
00075 
00076     The specified (software) interrupt entry of IDT will be updated to
00077     point to the specified handler.  For all threads which belong to the
00078     specified process, their execution processors will be notified to
00079     make the same change.
00080 
00081     This function only exists on i386 and i386 compatible processors.
00082 
00083     No checking is done on the validity of the interrupt handler.
00084 
00085 Arguments:
00086 
00087     Process - Pointer to KPROCESS object describing the process for
00088         which the int 21 entry is to be set.
00089 
00090     Interrupt - The software interrupt vector which will be updated.
00091 
00092     Selector, offset - Specified the address of the new handler.
00093 
00094     Gate32 - True if the gate should be 32 bit, false otherwise
00095 
00096 Return Value:
00097 
00098     NTSTATUS.
00099 
00100 --*/
00101 
00102 {
00103 
00104     KIRQL OldIrql;
00105     BOOLEAN LocalProcessor;
00106     KAFFINITY TargetProcessors;
00107     PKPRCB  Prcb;
00108     KIDTENTRY IdtDescriptor;
00109     ULONG Flags, Base, Limit;
00110 
00111     //
00112     // Check the validity of the request
00113     // 1. Currently, we support int21 redirection only
00114     // 2. The specified interrupt handler must be in user space.
00115     //
00116 
00117     if (Interrupt != 0x21 || Offset >= (ULONG)MM_HIGHEST_USER_ADDRESS ||
00118         !Ki386GetSelectorParameters(Selector, &Flags, &Base, &Limit) ){
00119         return(STATUS_INVALID_PARAMETER);
00120     }
00121 
00122     //
00123     // Initialize the contents of the IDT entry
00124     //
00125 
00126     IdtDescriptor.Offset = (USHORT)Offset;
00127     IdtDescriptor.Selector = Selector | RPL_MASK | LDT_MASK;
00128     IdtDescriptor.ExtendedOffset = (USHORT)(Offset >> 16);
00129     IdtDescriptor.Access = IDT_ACCESS_DPL_USER | IDT_ACCESS_PRESENT;
00130     if (Gate32) {
00131         IdtDescriptor.Access |= IDT_ACCESS_TYPE_386_TRAP;
00132 
00133     } else {
00134         IdtDescriptor.Access |= IDT_ACCESS_TYPE_286_TRAP;
00135     }
00136 
00137     //
00138     // Acquire the context swap lock so a context switch will not occur.
00139     //
00140 
00141     KiLockContextSwap(&OldIrql);
00142 
00143     //
00144     // Set the Ldt fields in the process object
00145     //
00146 
00147     Process->Int21Descriptor = IdtDescriptor;
00148 
00149     //
00150     // Tell all processors active for this process to reload their LDTs
00151     //
00152 
00153 #if !defined(NT_UP)
00154 
00155     Prcb = KeGetCurrentPrcb();
00156     TargetProcessors = Process->ActiveProcessors & ~Prcb->SetMember;
00157     if (TargetProcessors != 0) {
00158         KiIpiSendPacket(TargetProcessors,
00159                         Ki386LoadTargetInt21Entry,
00160                         NULL,
00161                         NULL,
00162                         NULL);
00163     }
00164 
00165 #endif
00166 
00167     KiLoadInt21Entry();
00168 
00169 #if !defined(NT_UP)
00170 
00171     //
00172     // Wait until all of the target processors have finished reloading
00173     // their LDT.
00174     //
00175 
00176     if (TargetProcessors != 0) {
00177         KiIpiStallOnPacketTargets(TargetProcessors);
00178     }
00179 
00180 #endif
00181 
00182     //
00183     // Restore IRQL and unlock the context swap lock.
00184     //
00185 
00186     KiUnlockContextSwap(OldIrql);
00187     return STATUS_SUCCESS;
00188 }

BOOLEAN Ki386GetSelectorParameters (  IN USHORT  Selector,
OUT PULONG  Flags,
OUT PULONG  Base,
OUT PULONG  Limit
) 
 

Referenced by Ke386SetVdmInterruptHandler(), PushPmInterrupt(), and VdmConvertToLinearAddress().

VOID Ki386LoadTargetInt21Entry (  IN PKIPI_CONTEXT  SignalDone,
IN PVOID  Parameter1,
IN PVOID  Parameter2,
IN PVOID  Parameter3
) 
 

Definition at line 194 of file vdmint21.c.

References KiIpiSignalPacketDone(), and KiLoadInt21Entry.

Referenced by Ke386SetVdmInterruptHandler(). 

00202                    :
00203 
00204     Reload local Ldt register and clear signal bit in TargetProcessor mask
00205 
00206 Arguments:
00207 
00208     Argument - pointer to a ipi packet structure.
00209     ReadyFlag - Pointer to flag to be set once LDTR has been reloaded
00210 
00211 Return Value:
00212 
00213     none.
00214 
00215 --*/
00216 
00217 {
00218 
00219     //
00220     // Set the int 21 entry of IDT from currently active process object
00221     //
00222 
00223     KiLoadInt21Entry();
00224     KiIpiSignalPacketDone(PacketContext);
00225     return;
00226 }

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