Sweden-Number/msdos/dosaspi.c

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#include "config.h"
#include "winbase.h"
#include "winaspi.h"
#include "wnaspi32.h"
#include "heap.h"
#include "debugtools.h"
#include "selectors.h"
#include "miscemu.h" /* DOSMEM_* */
#include "callback.h"
#include "winerror.h"
DEFAULT_DEBUG_CHANNEL(aspi)
static HINSTANCE hWNASPI32 = INVALID_HANDLE_VALUE;
static DWORD (__cdecl *pSendASPI32Command) (LPSRB) = NULL;
static void
DOSASPI_PostProc( SRB_ExecSCSICmd *lpPRB )
{
DWORD ptrSRB;
LPSRB16 lpSRB16;
memcpy(&ptrSRB,(LPBYTE)(lpPRB+1)+lpPRB->SRB_SenseLen,sizeof(DWORD));
TRACE("Copying data back to DOS client at 0x%8lx\n",ptrSRB);
lpSRB16 = DOSMEM_MapRealToLinear(ptrSRB);
lpSRB16->cmd.SRB_TargStat = lpPRB->SRB_TargStat;
lpSRB16->cmd.SRB_HaStat = lpPRB->SRB_HaStat;
memcpy((LPBYTE)(lpSRB16+1)+lpSRB16->cmd.SRB_CDBLen,&lpPRB->SenseArea[0],lpSRB16->cmd.SRB_SenseLen);
/* Now do posting */
if( lpPRB->SRB_Status == SS_SECURITY_VIOLATION )
{
/* SS_SECURITY_VIOLATION isn't defined in DOS ASPI */
TRACE("Returning SS_NO_DEVICE for SS_SECURITY_VIOLATION\n");
lpPRB->SRB_Status = SS_NO_DEVICE;
}
lpSRB16->cmd.SRB_Status = lpPRB->SRB_Status;
TRACE("SRB_Status = 0x%x\n", lpPRB->SRB_Status);
HeapFree(GetProcessHeap(),0,lpPRB);
if( (lpSRB16->cmd.SRB_Flags & SRB_POSTING) && lpSRB16->cmd.SRB_PostProc )
{
CONTEXT86 ctx;
/* The stack should look like this on entry to proc
* NOTE: the SDK draws the following diagram bass akwards, use this one
* to avoid being confused. Remember, the act of pushing something on
* an intel stack involves decreasing the stack pointer by the size of
* the data, and then copying the data at the new SP.
*/
/***************************
* ... Other crap that is already on the stack ...
* Segment of SRB Pointer <- SP+6
* Offset of SRB Pointer <- SP+4
* Segment of return address <- SP+2
* Offset of return address <- SP+0
*/
/* FIXME: I am about 99% sure what is here is correct,
* but this code has never been tested (and probably
* won't be either until someone finds a DOS program
* that actually uses a Post Routine) */
/* Zero everything */
memset(&ctx, 0, sizeof(ctx));
/* CS:IP is routine to call */
CS_reg(&ctx) = SELECTOROF(lpSRB16->cmd.SRB_PostProc);
EIP_reg(&ctx) = OFFSETOF(lpSRB16->cmd.SRB_PostProc);
/* DPMI_CallRMProc will push the pointer to the stack
* it is given (in this case &ptrSRB) with length
* 2*sizeof(WORD), that is, it copies the the contents
* of ptrSRB onto the stack, and decs sp by 2*sizeof(WORD).
* After doing that, it pushes the return address
* onto the stack (so we don't need to worry about that)
* So the stack should be okay for the PostProc
*/
if(DPMI_CallRMProc(&ctx, (LPWORD)&ptrSRB, 2, FALSE))
{
TRACE("DPMI_CallRMProc returned nonzero (error) status\n");
}
} /* if ((SRB_Flags&SRB_POSTING) && SRB_PostProc) */
}
static
DWORD ASPI_SendASPIDOSCommand(DWORD ptrSRB)
{
PSRB_ExecSCSICmd lpPRB;
DWORD retval;
union tagSRB16 * lpSRB16;
lpSRB16 = DOSMEM_MapRealToLinear(ptrSRB);
retval = SS_ERR;
switch( lpSRB16->common.SRB_Cmd )
{
case SC_HA_INQUIRY:
TRACE("SC_HA_INQUIRY\n");
/* Format is identical in this case */
retval = (*pSendASPI32Command)((LPSRB)lpSRB16);
break;
case SC_GET_DEV_TYPE:
TRACE("SC_GET_DEV_TYPE\n");
/* Format is identical in this case */
retval = (*pSendASPI32Command)((LPSRB)lpSRB16);
break;
case SC_EXEC_SCSI_CMD:
TRACE("SC_EXEC_SCSI_CMD\n");
TRACE("Copying data from DOS client at 0x%8lx\n",ptrSRB);
lpPRB = HeapAlloc(GetProcessHeap(),0,sizeof(SRB)+lpSRB16->cmd.SRB_SenseLen+sizeof(DWORD));
#define srb_dos_to_w32(name) \
lpPRB->SRB_##name = lpSRB16->cmd.SRB_##name
srb_dos_to_w32(Cmd);
srb_dos_to_w32(Status);
srb_dos_to_w32(HaId);
srb_dos_to_w32(BufLen);
srb_dos_to_w32(SenseLen);
srb_dos_to_w32(CDBLen);
srb_dos_to_w32(Target);
srb_dos_to_w32(Lun);
#undef srb_dos_to_w32
/* Allow certain flags to go on to WNASPI32, we also need
* to make sure SRB_POSTING is enabled */
lpPRB->SRB_Flags = SRB_POSTING | (lpSRB16->cmd.SRB_Flags&(SRB_DIR_IN|SRB_DIR_OUT|SRB_ENABLE_RESIDUAL_COUNT));
/* Pointer to data buffer */
lpPRB->SRB_BufPointer = DOSMEM_MapRealToLinear(lpSRB16->cmd.SRB_BufPointer);
/* Copy CDB in */
memcpy(&lpPRB->CDBByte[0],&lpSRB16->cmd.CDBByte[0],lpSRB16->cmd.SRB_CDBLen);
/* Set post proc to our post proc */
lpPRB->SRB_PostProc = &DOSASPI_PostProc;
/* Stick the DWORD after all the sense info */
memcpy((LPBYTE)(lpPRB+1)+lpPRB->SRB_SenseLen,&ptrSRB,sizeof(DWORD));
retval = (*pSendASPI32Command)((LPSRB)lpPRB);
break;
case SC_ABORT_SRB:
TRACE("SC_ABORT_SRB\n");
/* Would need some sort of table of active shit */
break;
case SC_RESET_DEV:
TRACE("SC_RESET_DEV\n");
break;
default:
TRACE("Unkown command code\n");
break;
}
TRACE("Returning %lx\n", retval );
return retval;
}
void WINAPI ASPI_DOS_func(CONTEXT86 *context)
{
WORD *stack = CTX_SEG_OFF_TO_LIN(context, SS_reg(context), ESP_reg(context));
DWORD ptrSRB = *(DWORD *)&stack[2];
ASPI_SendASPIDOSCommand(ptrSRB);
/* simulate a normal RETF sequence as required by DPMI CallRMProcFar */
EIP_reg(context) = *(stack++);
CS_reg(context) = *(stack++);
ESP_reg(context) += 2*sizeof(WORD);
}
/* returns the address of a real mode callback to ASPI_DOS_func() */
void ASPI_DOS_HandleInt(CONTEXT86 *context)
{
FARPROC16 *p = (FARPROC16 *)CTX_SEG_OFF_TO_LIN(context, DS_reg(context), EDX_reg(context));
TRACE("DOS ASPI opening\n");
if ((CX_reg(context) == 4) || (CX_reg(context) == 5))
{
if( hWNASPI32 == INVALID_HANDLE_VALUE )
{
TRACE("Loading WNASPI32\n");
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hWNASPI32 = LoadLibraryExA("WNASPI32", 0, 0);
}
if( hWNASPI32 == INVALID_HANDLE_VALUE )
{
ERR("Error loading WNASPI32\n");
goto error_exit;
}
/* Get SendASPI32Command by Ordinal 2 */
/* Cast to correct argument/return types */
pSendASPI32Command = (DWORD (*)(LPSRB))GetProcAddress(hWNASPI32, (LPBYTE)2);
if( !pSendASPI32Command )
{
ERR("Error getting ordinal 2 from WNASPI32\n");
goto error_exit;
}
*p = DPMI_AllocInternalRMCB(ASPI_DOS_func);
TRACE("allocated real mode proc %p\n", *p);
AX_reg(context) = CX_reg(context);
return;
}
error_exit:
/* Return some error... General Failure sounds okay */
AX_reg(context) = ERROR_GEN_FAILURE;
SET_CFLAG(context);
}