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* Copyright 1993 by Thomas Mueller
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Thomas Mueller not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Thomas Mueller makes no representations
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* about the suitability of this software for any purpose. It is provided
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* "as is" without express or implied warranty.
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* THOMAS MUELLER DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THOMAS MUELLER BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/lynxos/lynx_video.c,v 3.17 2000/10/28 01:42:27 mvojkovi Exp $ */
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#include "scrnintstr.h"
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#include "xf86_OSlib.h"
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#include "xf86OSpriv.h"
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#if defined(__powerpc__)
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# if defined(USE_MACHINE_ABSOLUTE)
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# include <machine/absolute.h>
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# define __USER_SPACE_INCLUDE
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# include <hw_absolute.h>
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void ppcPciIoMap(int bus);
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#ifdef HAS_MTRR_SUPPORT
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#include <sys/memrange.h>
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#define X_MTRR_ID "XFree86"
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static pointer setWC(int, unsigned long, unsigned long, Bool, MessageType);
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static void undoWC(int, pointer);
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static Bool cleanMTRR(void);
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static int devMemFd = -1;
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#define MTRR_DEVICE "/dev/mtrr"
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int smem_remove(char *name)
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char *smem_create(char *name, char *arg_addr, long size, int mode)
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int prot = PROT_READ|PROT_WRITE|PROT_UNCACHE;
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int flags = MAP_SHARED;
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off_t off = (off_t)arg_addr;
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if ((fd = open("/dev/mem" , O_RDWR)) < 0)
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if (mode == SM_DETACH)
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munmap(arg_addr, len);
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if ((retval = mmap (addr, len, prot, flags, fd, off) ) == MAP_FAILED)
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/***************************************************************************/
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/* Video Memory Mapping section */
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/***************************************************************************/
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static _SMEMS smems[MAX_SMEMS];
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#define MAP_FAILED ((void *)-1)
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for (i = 0; i < MAX_SMEMS; i++) {
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if (*smems[i].name && smems[i].ptr) {
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(void)smem_create(NULL, smems[i].ptr, 0, SM_DETACH);
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(void)smem_remove(smems[i].name);
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*smems[i].name = '\0';
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MapVidMem(int ScreenNum, unsigned long Base, unsigned long Size, int flags)
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for (i = 0; i < MAX_SMEMS; i++)
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if (!*smems[i].name && free_slot == -1)
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if (smems[i].Base == Base && smems[i].Size == Size
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if (i == MAX_SMEMS && free_slot == -1)
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FatalError("MapVidMem: failed to smem_create Base %x Size %x (out of SMEMS entries)\n",
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sprintf(smems[i].name, "Video-%d", i);
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smems[i].Base = Base;
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smems[i].Size = Size;
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xf86MsgVerb(X_INFO, 3, "MapVidMem: Base=0x%x Size=0x%x\n",
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#if defined(__powerpc__)
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if (((unsigned long)Base & PHYS_IO_MEM_START) != PHYS_IO_MEM_START) {
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Base = Base | PHYS_IO_MEM_START;
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smems[i].ptr = smem_create(smems[i].name, (char *)Base, Size, SM_READ|SM_WRITE);
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if (smems[i].ptr == NULL)
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/* check if there is a stale segment around */
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if (smem_remove(smems[i].name) == 0) {
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"MapVidMem: removed stale smem_ segment %s\n",
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smems[i].ptr = smem_create(smems[i].name,
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(char *)Base, Size, SM_READ|SM_WRITE);
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if (smems[i].ptr == NULL) {
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*smems[i].name = '\0';
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FatalError("MapVidMem: failed to smem_create Base %x Size %x (%s)\n",
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Base, Size, strerror(errno));
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xf86MsgVerb(X_INFO, 3, "MapVidMem: Base=0x%x Size=0x%x Ptr=0x%x\n",
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Base, Size, smems[i].ptr);
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UnMapVidMem(int ScreenNum, pointer Base, unsigned long Size)
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xf86MsgVerb(X_INFO, 3, "UnMapVidMem: Base/Ptr=0x%x Size=0x%x\n",
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for (i = 0; i < MAX_SMEMS; i++)
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if (*smems[i].name && smems[i].ptr == Base
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&& smems[i].Size == Size)
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if (--smems[i].RefCnt > 0)
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(void)smem_create(NULL, smems[i].ptr, 0, SM_DETACH);
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xf86MsgVerb(X_INFO, 3,
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"UnMapVidMem: smem_create(%s, 0x%08x, ... "
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"SM_DETACH)\n", smems[i].name, smems[i].ptr);
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(void)smem_remove(smems[i].name);
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*smems[i].name = '\0';
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xf86MsgVerb(X_WARNING, 2,
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"UnMapVidMem: no SMEM found for Base = %lx Size = %lx\n",
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xf86OSInitVidMem(VidMemInfoPtr pVidMem)
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pVidMem->linearSupported = TRUE;
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pVidMem->mapMem = MapVidMem;
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pVidMem->unmapMem = UnMapVidMem;
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#ifdef HAS_MTRR_SUPPORT
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pVidMem->setWC = setWC;
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pVidMem->undoWC = undoWC;
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pVidMem->initialised = TRUE;
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/***************************************************************************/
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/* Interrupt Handling section */
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/***************************************************************************/
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xf86DisableInterrupts()
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xf86EnableInterrupts()
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/***************************************************************************/
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/* I/O Permissions section for PowerPC */
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/***************************************************************************/
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#if defined(__powerpc__)
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volatile unsigned char *ioBase = MAP_FAILED;
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volatile unsigned char *pciConfBase = MAP_FAILED;
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static int IOEnabled;
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smem_create(NULL, (char *) ioBase, 0, SM_DETACH);
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smem_remove("IOBASE");
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if (IOEnabled++ == 0) {
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ioBase = (unsigned char *) smem_create("IOBASE",
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(char *)PHYS_ISA_IO_SPACE, 64*1024, SM_READ|SM_WRITE);
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if (ioBase == MAP_FAILED) {
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xf86Msg(X_WARNING,"xf86EnableIO: Failed to map I/O\n");
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ErrorF("xf86EnableIO: mapped I/O at vaddr 0x%08x\n",
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atexit(removeIOSmem);
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if (--IOEnabled == 0)
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xf86DisableIOPrivs(void)
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#ifdef HAS_MTRR_SUPPORT
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/* memory range (MTRR) support for LynxOS (taken from BSD MTRR support) */
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* This code is experimental. Some parts may be overkill, and other parts
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* getAllRanges returns the full list of memory ranges with attributes set.
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static struct mem_range_desc *
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getAllRanges(int *nmr)
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struct mem_range_desc *mrd;
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struct mem_range_op mro;
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* Find how many ranges there are. If this fails, then the kernel
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* probably doesn't have MTRR support.
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if (ioctl(devMemFd, MEMRANGE_GET, &mro))
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*nmr = mro.mo_arg[0];
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mrd = xnfalloc(*nmr * sizeof(struct mem_range_desc));
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mro.mo_arg[0] = *nmr;
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if (ioctl(devMemFd, MEMRANGE_GET, &mro)) {
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* cleanMTRR removes any memory attribute that may be left by a previous
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* X server. Normally there won't be any, but this takes care of the
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* case where a server crashed without being able finish cleaning up.
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struct mem_range_desc *mrd;
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struct mem_range_op mro;
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/* This shouldn't happen */
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if ((devMemFd = open(MTRR_DEVICE, O_RDONLY)) < 0) {
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if (!(mrd = getAllRanges(&nmr)))
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for (i = 0; i < nmr; i++) {
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if (strcmp(mrd[i].mr_owner, X_MTRR_ID) == 0 &&
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(mrd[i].mr_flags & MDF_ACTIVE)) {
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ErrorF("Clean for (0x%lx,0x%lx)\n",
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(unsigned long)mrd[i].mr_base,
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(unsigned long)mrd[i].mr_len);
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if (mrd[i].mr_flags & MDF_FIXACTIVE) {
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mro.mo_arg[0] = MEMRANGE_SET_UPDATE;
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mrd[i].mr_flags = MDF_UNCACHEABLE;
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mro.mo_arg[0] = MEMRANGE_SET_REMOVE;
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mro.mo_desc = mrd + i;
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ioctl(devMemFd, MEMRANGE_SET, &mro);
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typedef struct x_RangeRec {
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struct mem_range_desc mrd;
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struct x_RangeRec * next;
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} RangeRec, *RangePtr;
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freeRangeList(RangePtr range)
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dupRangeList(RangePtr list)
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RangePtr new = NULL, rp, p;
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p = xnfalloc(sizeof(RangeRec));
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sortRangeList(RangePtr list)
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RangePtr rp1, rp2, copy, sorted = NULL, minp, prev, minprev;
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unsigned long minBase;
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/* Sort by base address */
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rp1 = copy = dupRangeList(list);
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minBase = rp1->mrd.mr_base;
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if (rp2->mrd.mr_base < minBase) {
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minBase = rp2->mrd.mr_base;
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minprev->next = minp->next;
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* findRanges returns a list of ranges that overlap the specified range.
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findRanges(unsigned long base, unsigned long size, RangePtr *ucp, RangePtr *wcp)
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struct mem_range_desc *mrd;
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if (!(mrd = getAllRanges(&nmr)))
520
for (i = 0; i < nmr; i++) {
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if ((mrd[i].mr_flags & MDF_ACTIVE) &&
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mrd[i].mr_base < base + size &&
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mrd[i].mr_base + mrd[i].mr_len > base) {
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if (mrd[i].mr_flags & MDF_WRITECOMBINE)
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else if (mrd[i].mr_flags & MDF_UNCACHEABLE)
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rp = xnfalloc(sizeof(RangeRec));
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* This checks if the existing overlapping ranges fully cover the requested
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* range. Is this overkill?
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fullCoverage(unsigned long base, unsigned long size, RangePtr overlap)
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RangePtr rp1, sorted = NULL;
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sorted = sortRangeList(overlap);
555
if (rp1->mrd.mr_base > base) {
556
freeRangeList(sorted);
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base = rp1->mrd.mr_base + rp1->mrd.mr_len;
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freeRangeList(sorted);
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freeRangeList(sorted);
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addWC(int screenNum, unsigned long base, unsigned long size, MessageType from)
574
RangePtr uc = NULL, wc = NULL, retlist = NULL;
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struct mem_range_desc mrd;
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struct mem_range_op mro;
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findRanges(base, size, &uc, &wc);
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/* See of the full range is already WC */
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if (!uc && fullCoverage(base, size, wc)) {
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xf86DrvMsg(screenNum, from,
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"Write-combining range (0x%lx,0x%lx) was already set\n",
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/* Otherwise, try to add the new range */
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strcpy(mrd.mr_owner, X_MTRR_ID);
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mrd.mr_flags = MDF_WRITECOMBINE;
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mro.mo_arg[0] = MEMRANGE_SET_UPDATE;
595
if (ioctl(devMemFd, MEMRANGE_SET, &mro)) {
596
xf86DrvMsg(screenNum, X_WARNING,
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"Failed to set write-combining range "
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"(0x%lx,0x%lx)\n", base, size);
601
xf86DrvMsg(screenNum, from,
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"Write-combining range (0x%lx,0x%lx)\n", base, size);
603
retlist = xnfalloc(sizeof(RangeRec));
605
retlist->wasWC = FALSE;
606
retlist->next = NULL;
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delWC(int screenNum, unsigned long base, unsigned long size, MessageType from)
614
RangePtr uc = NULL, wc = NULL, retlist = NULL;
615
struct mem_range_desc mrd;
616
struct mem_range_op mro;
618
findRanges(base, size, &uc, &wc);
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* See of the full range is already not WC, or if there is full
622
* coverage from UC ranges.
624
if (!wc || fullCoverage(base, size, uc)) {
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xf86DrvMsg(screenNum, from,
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"Write-combining range (0x%lx,0x%lx) was already clear\n",
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/* Otherwise, try to add the new range */
634
strcpy(mrd.mr_owner, X_MTRR_ID);
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mrd.mr_flags = MDF_UNCACHEABLE;
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mro.mo_arg[0] = MEMRANGE_SET_UPDATE;
638
if (ioctl(devMemFd, MEMRANGE_SET, &mro)) {
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xf86DrvMsg(screenNum, X_WARNING,
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"Failed to remove write-combining range "
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"(0x%lx,0x%lx)\n", base, size);
642
/* XXX Should then remove all of the overlapping WC ranges */
645
xf86DrvMsg(screenNum, from,
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"Removed Write-combining range (0x%lx,0x%lx)\n",
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retlist = xnfalloc(sizeof(RangeRec));
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retlist->wasWC = TRUE;
651
retlist->next = NULL;
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setWC(int screenNum, unsigned long base, unsigned long size, Bool enable,
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return addWC(screenNum, base, size, from);
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return delWC(screenNum, base, size, from);
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undoWC(int screenNum, pointer list)
670
struct mem_range_op mro;
676
ErrorF("Undo for (0x%lx,0x%lx), %d\n",
677
(unsigned long)rp->mrd.mr_base,
678
(unsigned long)rp->mrd.mr_len, rp->wasWC);
682
mro.mo_arg[0] = MEMRANGE_SET_UPDATE;
683
rp->mrd.mr_flags = MDF_WRITECOMBINE;
684
strcpy(rp->mrd.mr_owner, "unknown");
686
mro.mo_arg[0] = MEMRANGE_SET_REMOVE;
688
mro.mo_desc = &rp->mrd;
690
if (ioctl(devMemFd, MEMRANGE_SET, &mro)) {
692
mro.mo_arg[0] = MEMRANGE_SET_UPDATE;
693
rp->mrd.mr_flags = MDF_UNCACHEABLE;
694
strcpy(rp->mrd.mr_owner, "unknown");
695
if (ioctl(devMemFd, MEMRANGE_SET, &mro))
701
xf86DrvMsg(screenNum, X_WARNING,
702
"Failed to restore MTRR range (0x%lx,0x%lx)\n",
703
(unsigned long)rp->mrd.mr_base,
704
(unsigned long)rp->mrd.mr_len);
710
#endif /* HAS_MTRR_SUPPORT */