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-/****************************************************************************
-*
-* SciTech OS Portability Manager Library
-*
-* ========================================================================
-*
-* The contents of this file are subject to the SciTech MGL Public
-* License Version 1.0 (the "License"); you may not use this file
-* except in compliance with the License. You may obtain a copy of
-* the License at http://www.scitechsoft.com/mgl-license.txt
-*
-* Software distributed under the License is distributed on an
-* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
-* implied. See the License for the specific language governing
-* rights and limitations under the License.
-*
-* The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc.
-*
-* The Initial Developer of the Original Code is SciTech Software, Inc.
-* All Rights Reserved.
-*
-* ========================================================================
-*
-* Language: ANSI C
-* Environment: any
-*
-* Description: Simple test program to test the write combine functions.
-*
-* Note that this program should never be used in a production
-* environment, because write combining needs to be handled
-* with more intimate knowledge of the display hardware than
-* you can obtain by simply examining the PCI configuration
-* space.
-*
-****************************************************************************/
-
-#include "pmapi.h"
-#include "pcilib.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdarg.h>
-
-/*------------------------- Global Variables ------------------------------*/
-
-static int NumPCI = -1;
-static PCIDeviceInfo *PCI;
-static int *BridgeIndex;
-static int *DeviceIndex;
-static int NumBridges;
-static PCIDeviceInfo *AGPBridge = NULL;
-static int NumDevices;
-
-/*-------------------------- Implementation -------------------------------*/
-
-/****************************************************************************
-RETURNS:
-Number of display devices found.
-
-REMARKS:
-This function enumerates the number of available display devices on the
-PCI bus, and returns the number found.
-****************************************************************************/
-static int PCI_enumerateDevices(void)
-{
- int i,j;
- PCIDeviceInfo *info;
-
- /* If this is the first time we have been called, enumerate all */
- /* devices on the PCI bus. */
- if (NumPCI == -1) {
- if ((NumPCI = PCI_getNumDevices()) == 0)
- return -1;
- PCI = malloc(NumPCI * sizeof(PCI[0]));
- BridgeIndex = malloc(NumPCI * sizeof(BridgeIndex[0]));
- DeviceIndex = malloc(NumPCI * sizeof(DeviceIndex[0]));
- if (!PCI || !BridgeIndex || !DeviceIndex)
- return -1;
- for (i = 0; i < NumPCI; i++)
- PCI[i].dwSize = sizeof(PCI[i]);
- if (PCI_enumerate(PCI) == 0)
- return -1;
-
- /* Build a list of all PCI bridge devices */
- for (i = 0,NumBridges = 0,BridgeIndex[0] = -1; i < NumPCI; i++) {
- if (PCI[i].BaseClass == PCI_BRIDGE_CLASS)
- BridgeIndex[NumBridges++] = i;
- }
-
- /* Now build a list of all display class devices */
- for (i = 0,NumDevices = 1,DeviceIndex[0] = -1; i < NumPCI; i++) {
- if (PCI_IS_DISPLAY_CLASS(&PCI[i])) {
- if ((PCI[i].Command & 0x3) == 0x3)
- DeviceIndex[0] = i;
- else
- DeviceIndex[NumDevices++] = i;
- if (PCI[i].slot.p.Bus != 0) {
- /* This device is on a different bus than the primary */
- /* PCI bus, so it is probably an AGP device. Find the */
- /* AGP bus device that controls that bus so we can */
- /* control it. */
- for (j = 0; j < NumBridges; j++) {
- info = (PCIDeviceInfo*)&PCI[BridgeIndex[j]];
- if (info->u.type1.SecondayBusNumber == PCI[i].slot.p.Bus) {
- AGPBridge = info;
- break;
- }
- }
- }
- }
- }
- }
- return NumDevices;
-}
-
-/****************************************************************************
-REMARKS:
-Enumerates useful information about attached display devices.
-****************************************************************************/
-static void ShowDisplayDevices(void)
-{
- int i,index;
-
- printf("Displaying enumeration of %d PCI display devices\n", NumDevices);
- printf("\n");
- printf("DeviceID SubSystem Base10h (length ) Base14h (length )\n");
- for (index = 0; index < NumDevices; index++) {
- i = DeviceIndex[index];
- printf("%04X:%04X %04X:%04X %08lX (%6ld KB) %08lX (%6ld KB)\n",
- PCI[i].VendorID,
- PCI[i].DeviceID,
- PCI[i].u.type0.SubSystemVendorID,
- PCI[i].u.type0.SubSystemID,
- PCI[i].u.type0.BaseAddress10,
- PCI[i].u.type0.BaseAddress10Len / 1024,
- PCI[i].u.type0.BaseAddress14,
- PCI[i].u.type0.BaseAddress14Len / 1024);
- }
- printf("\n");
-}
-
-/****************************************************************************
-REMARKS:
-Dumps the value for a write combine region to the display.
-****************************************************************************/
-static char *DecodeWCType(
- uint type)
-{
- static char *names[] = {
- "UNCACHABLE",
- "WRCOMB",
- "UNKNOWN",
- "UNKNOWN",
- "WRTHROUGH",
- "WRPROT",
- "WRBACK",
- };
- if (type <= PM_MTRR_MAX)
- return names[type];
- return "UNKNOWN";
-}
-
-/****************************************************************************
-REMARKS:
-Dumps the value for a write combine region to the display.
-****************************************************************************/
-static void PMAPI EnumWriteCombine(
- ulong base,
- ulong length,
- uint type)
-{
- printf("%08lX %-10ld %s\n", base, length / 1024, DecodeWCType(type));
-}
-
-/****************************************************************************
-PARAMETERS:
-err - Error to log
-
-REMARKS:
-Function to log an error message if the MTRR write combining attempt failed.
-****************************************************************************/
-static void LogMTRRError(
- int err)
-{
- if (err == PM_MTRR_ERR_OK)
- return;
- switch (err) {
- case PM_MTRR_NOT_SUPPORTED:
- printf("Failed: MTRR is not supported by host CPU\n");
- break;
- case PM_MTRR_ERR_PARAMS:
- printf("Failed: Invalid parameters passed to PM_enableWriteCombined!\n");
- break;
- case PM_MTRR_ERR_NOT_4KB_ALIGNED:
- printf("Failed: Address is not 4Kb aligned!\n");
- break;
- case PM_MTRR_ERR_BELOW_1MB:
- printf("Failed: Addresses below 1Mb cannot be write combined!\n");
- break;
- case PM_MTRR_ERR_NOT_ALIGNED:
- printf("Failed: Address is not correctly aligned for processor!\n");
- break;
- case PM_MTRR_ERR_OVERLAP:
- printf("Failed: Address overlaps an existing region!\n");
- break;
- case PM_MTRR_ERR_TYPE_MISMATCH:
- printf("Failed: Adress is contained with existing region, but type is different!\n");
- break;
- case PM_MTRR_ERR_NONE_FREE:
- printf("Failed: Out of MTRR registers!\n");
- break;
- case PM_MTRR_ERR_NOWRCOMB:
- printf("Failed: This processor does not support write combining!\n");
- break;
- case PM_MTRR_ERR_NO_OS_SUPPORT:
- printf("Failed: MTRR is not supported by host OS\n");
- break;
- default:
- printf("Failed: UNKNOWN ERROR!\n");
- break;
- }
- exit(-1);
-}
-
-/****************************************************************************
-REMARKS:
-Shows all write combine regions.
-****************************************************************************/
-static void ShowWriteCombine(void)
-{
- printf("Base Length(KB) Type\n");
- LogMTRRError(PM_enumWriteCombine(EnumWriteCombine));
- printf("\n");
-}
-
-/****************************************************************************
-REMARKS:
-Dumps the value for a write combine region to the display.
-****************************************************************************/
-static void EnableWriteCombine(void)
-{
- int i,index;
-
- for (index = 0; index < NumDevices; index++) {
- i = DeviceIndex[index];
- if (PCI[i].u.type0.BaseAddress10 & 0x8) {
- LogMTRRError(PM_enableWriteCombine(
- PCI[i].u.type0.BaseAddress10 & 0xFFFFFFF0,
- PCI[i].u.type0.BaseAddress10Len,
- PM_MTRR_WRCOMB));
- }
- if (PCI[i].u.type0.BaseAddress14 & 0x8) {
- LogMTRRError(PM_enableWriteCombine(
- PCI[i].u.type0.BaseAddress14 & 0xFFFFFFF0,
- PCI[i].u.type0.BaseAddress14Len,
- PM_MTRR_WRCOMB));
- }
- }
- printf("\n");
- ShowDisplayDevices();
- ShowWriteCombine();
-}
-
-/****************************************************************************
-REMARKS:
-Dumps the value for a write combine region to the display.
-****************************************************************************/
-static void DisableWriteCombine(void)
-{
- int i,index;
-
- for (index = 0; index < NumDevices; index++) {
- i = DeviceIndex[index];
- if (PCI[i].u.type0.BaseAddress10 & 0x8) {
- LogMTRRError(PM_enableWriteCombine(
- PCI[i].u.type0.BaseAddress10 & 0xFFFFFFF0,
- PCI[i].u.type0.BaseAddress10Len,
- PM_MTRR_UNCACHABLE));
- }
- if (PCI[i].u.type0.BaseAddress14 & 0x8) {
- LogMTRRError(PM_enableWriteCombine(
- PCI[i].u.type0.BaseAddress14 & 0xFFFFFFF0,
- PCI[i].u.type0.BaseAddress14Len,
- PM_MTRR_UNCACHABLE));
- }
- }
- printf("\n");
- ShowDisplayDevices();
- ShowWriteCombine();
-}
-
-int main(int argc,char *argv[])
-{
- PM_init();
- if (PCI_enumerateDevices() < 1) {
- printf("No PCI display devices found!\n");
- return -1;
- }
- if (argc < 2) {
- printf("usage: uswc [-show -on -off]\n\n");
- ShowDisplayDevices();
- return -1;
- }
- if (stricmp(argv[1],"-show") == 0)
- ShowWriteCombine();
- else if (stricmp(argv[1],"-on") == 0)
- EnableWriteCombine();
- else if (stricmp(argv[1],"-off") == 0)
- DisableWriteCombine();
- return 0;
-}
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