mirror of
https://github.com/X11Libre/xserver.git
synced 2026-10-15 00:13:28 +00:00
d23c46dd3e
permissions when no access to HW registers is required. For API changes
which mostly involve the modifications to make the RRFunc (introduced
with 6.8) more flexible please check Bugzilla #2407. NOTE: This patch
applies changes to OS specific files for other OSes which I cannot
test.
365 lines
9.4 KiB
C
365 lines
9.4 KiB
C
/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/sysv/sysv_video.c,v 3.20tsi Exp $ */
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/*
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* Copyright 1990,91 by Thomas Roell, Dinkelscherben, Germany
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* Copyright 1993 by David Wexelblat <dwex@goblin.org>
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*
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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 names of Thomas Roell and David Wexelblat
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* not be used in advertising or publicity pertaining to distribution of
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* the software without specific, written prior permission. Thomas Roell and
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* David Wexelblat makes no representations about the suitability of this
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* software for any purpose. It is provided "as is" without express or
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* implied warranty.
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*
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* THOMAS ROELL AND DAVID WEXELBLAT DISCLAIMS ALL WARRANTIES WITH REGARD TO
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* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL THOMAS ROELL OR DAVID WEXELBLAT BE LIABLE FOR
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* ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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/* $XConsortium: sysv_video.c /main/8 1996/10/25 11:38:09 kaleb $ */
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#include "X.h"
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#define _NEED_SYSI86
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#include "xf86.h"
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#include "xf86Priv.h"
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#include "xf86_OSlib.h"
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#include "xf86OSpriv.h"
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#ifndef MAP_FAILED
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#define MAP_FAILED ((void *)-1)
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#endif
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#ifndef SI86IOPL
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#define SET_IOPL() sysi86(SI86V86,V86SC_IOPL,PS_IOPL)
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#define RESET_IOPL() sysi86(SI86V86,V86SC_IOPL,0)
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#else
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#define SET_IOPL() sysi86(SI86IOPL,3)
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#define RESET_IOPL() sysi86(SI86IOPL,0)
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#endif
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/***************************************************************************/
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/* Video Memory Mapping section */
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/***************************************************************************/
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/*
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* XXX Support for SVR3 will need to be reworked if needed. In particular
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* the Region parameter is no longer passed, and will need to be dealt
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* with internally if required.
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* OK, i'll rework that thing ... (clean it up a lot)
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* SVR3 Support only with SVR3_MMAPDRV (mr)
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*
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*/
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#ifdef HAS_SVR3_MMAPDRV
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#ifndef MMAP_DEBUG
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#define MMAP_DEBUG 3
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#endif
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struct kd_memloc MapDSC;
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int mmapFd = -2;
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static int
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mmapStat(pointer Base, unsigned long Size) {
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int nmmreg,i=0,region=-1;
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mmapinfo_t *ibuf;
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nmmreg = ioctl(mmapFd, GETNMMREG);
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if(nmmreg <= 0)
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"\nNo physical memory mapped currently.\n\n");
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else {
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if((ibuf = (mmapinfo_t *)malloc(nmmreg*sizeof(mmapinfo_t))) == NULL)
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xf86Msg(X_WARNING,
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"Couldn't allocate memory 4 mmapinfo_t\n");
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else {
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if(ioctl(mmapFd, GETMMREG, ibuf) != -1)
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{
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"# mmapStat: [Size=%x,Base=%x]\n", Size, Base);
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"# Physical Address Size Reference Count\n");
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for(i = 0; i < nmmreg; i++) {
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"%-4d 0x%08X %5dk %5d ",
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i, ibuf[i].physaddr, ibuf[i].length/1024, ibuf[i].refcnt);
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if (ibuf[i].physaddr == Base || ibuf[i].length == Size ) {
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xf86MsgVerb(X_INFO, MMAP_DEBUG,"MATCH !!!");
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if (region==-1) region=i;
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}
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xf86ErrorFVerb(MMAP_DEBUG, "\n");
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}
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xf86ErrorFVerb(MMAP_DEBUG, "\n");
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}
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free(ibuf);
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}
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}
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if (region == -1 && nmmreg > 0) region=region * i;
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return(region);
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}
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#endif
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static Bool
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linearVidMem()
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{
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#ifdef SVR4
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return TRUE;
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#elif defined(HAS_SVR3_MMAPDRV)
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"# xf86LinearVidMem: MMAP 2.2.2 called\n");
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if(mmapFd >= 0) return TRUE;
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if ((mmapFd = open("/dev/mmap", O_RDWR)) != -1)
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{
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if(ioctl(mmapFd, GETVERSION) < 0x0222) {
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xf86Msg(X_WARNING,
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"xf86LinearVidMem: MMAP 2.2.2 or above required\n");
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xf86ErrorF("\tlinear memory access disabled\n");
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return FALSE;
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}
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return TRUE;
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}
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xf86Msg(X_WARNING, "xf86LinearVidMem: failed to open /dev/mmap (%s)\n",
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strerror(errno));
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xf86ErrorF("\tlinear memory access disabled\n");
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return FALSE;
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#endif
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}
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static pointer
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mapVidMem(int ScreenNum, unsigned long Base, unsigned long Size, int flags)
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{
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pointer base;
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int fd;
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#if defined(SVR4)
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fd = open(DEV_MEM, (flags & VIDMEM_READONLY) ? O_RDONLY : O_RDWR);
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if (fd < 0)
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{
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FatalError("xf86MapVidMem: failed to open %s (%s)\n",
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DEV_MEM, strerror(errno));
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}
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base = mmap((caddr_t)0, Size,
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(flags & VIDMEM_READONLY) ?
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PROT_READ : (PROT_READ | PROT_WRITE),
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MAP_SHARED, fd, (off_t)Base);
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close(fd);
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if (base == MAP_FAILED)
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{
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FatalError("%s: Could not mmap framebuffer [s=%x,a=%x] (%s)\n",
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"xf86MapVidMem", Size, Base, strerror(errno));
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}
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#else /* SVR4 */
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#ifdef HAS_SVR3_MMAPDRV
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xf86MsgVerb(X_INFO, MMAP_DEBUG, "# xf86MapVidMem: MMAP 2.2.2 called\n");
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"MMAP_VERSION: 0x%x\n",ioctl(mmapFd, GETVERSION));
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if (ioctl(mmapFd, GETVERSION) == -1)
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{
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xf86LinearVidMem();
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}
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"MMAP_VERSION: 0x%x\n",ioctl(mmapFd, GETVERSION));
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"xf86MapVidMem: Screen: %d\n", ScreenNum);
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mmapStat(Base,Size);
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/* To force the MMAP driver to provide the address */
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base = (pointer)0;
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"xf86MapVidMem: [s=%x,a=%x]\n", Size, Base);
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MapDSC.vaddr = (char *)base;
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MapDSC.physaddr = (char *)Base;
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MapDSC.length = Size;
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MapDSC.ioflg = 1;
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if(mmapFd >= 0)
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{
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if((base = (pointer)ioctl(mmapFd, MAP, &MapDSC)) == (pointer)-1)
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{
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FatalError("%s: Could not mmap framebuffer [s=%x,a=%x] (%s)\n",
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"xf86MapVidMem", Size, Base, strerror(errno));
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/* NOTREACHED */
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}
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/* Next time we want the same address! */
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MapDSC.vaddr = (char *)base;
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}
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"MapDSC.vaddr : 0x%x\n", MapDSC.vaddr);
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"MapDSC.physaddr: 0x%x\n", MapDSC.physaddr);
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"MapDSC.length : %d\n", MapDSC.length);
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mmapStat(Base,Size);
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"xf86MapVidMem: [s=%x,a=%x,b=%x]\n", Size, Base, base);
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"xf86MapVidMem: SUCCEED Mapping FrameBuffer \n");
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#endif /* HAS_SVR3_MMAPDRV */
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#endif /* SVR4 */
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return(base);
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}
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/* ARGSUSED */
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static void
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unmapVidMem(int ScreenNum, pointer Base, unsigned long Size)
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{
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#if defined (SVR4)
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munmap(Base, Size);
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#else /* SVR4 */
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#ifdef HAS_SVR3_MMAPDRV
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"# xf86UnMapVidMem: UNMapping FrameBuffer\n");
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mmapStat(Base,Size);
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ioctl(mmapFd, UNMAPRM , Base);
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mmapStat(Base,Size);
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xf86MsgVerb(X_INFO, MMAP_DEBUG,
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"# xf86UnMapVidMem: Screen: %d [v=%x]\n", ScreenNum, Base);
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#endif /* HAS_SVR3_MMAPDRV */
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#endif /* SVR4 */
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return;
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}
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#if defined(SVR4) && defined(i386) && !defined(sun)
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/*
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* For some SVR4 versions, a 32-bit read is done for the first location
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* in each page when the page is first mapped. If this is done while
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* memory access is enabled for regions that have read side-effects,
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* this can cause unexpected results, including lockups on some hardware.
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* This function is called to make sure each page is mapped while it is
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* safe to do so.
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*/
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/*
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* XXX Should get this the correct way (see os/xalloc.c), but since this is
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* for one platform I'll be lazy.
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*/
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#define X_PAGE_SIZE 4096
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static void
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readSideEffects(int ScreenNum, pointer Base, unsigned long Size)
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{
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unsigned long base, end, addr;
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CARD32 val;
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base = (unsigned long)Base;
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end = base + Size;
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for (addr = base; addr < end; addr += X_PAGE_SIZE)
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val = *(volatile CARD32 *)addr;
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}
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#endif
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void
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xf86OSInitVidMem(VidMemInfoPtr pVidMem)
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{
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pVidMem->linearSupported = linearVidMem();
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pVidMem->mapMem = mapVidMem;
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pVidMem->unmapMem = unmapVidMem;
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#if defined(SVR4) && defined(i386) && !defined(sun)
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pVidMem->readSideEffects = readSideEffects;
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#endif
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pVidMem->initialised = TRUE;
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}
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/***************************************************************************/
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/* I/O Permissions section */
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/***************************************************************************/
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static Bool ExtendedEnabled = FALSE;
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static Bool InitDone = FALSE;
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Bool
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xf86EnableIO()
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{
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int i;
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if (ExtendedEnabled)
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return TRUE;
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if (SET_IOPL() < 0)
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{
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xf86Msg(X_WARNING,
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"xf86EnableIO: Failed to set IOPL for extended I/O\n");
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return FALSE;
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}
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ExtendedEnabled = TRUE;
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return TRUE;
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}
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void
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xf86DisableIO()
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{
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if (!ExtendedEnabled)
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return;
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RESET_IOPL();
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ExtendedEnabled = FALSE;
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return;
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}
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/***************************************************************************/
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/* Interrupt Handling section */
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/***************************************************************************/
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Bool
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xf86DisableInterrupts()
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{
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if (!ExtendedEnabled)
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{
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if (SET_IOPL() < 0)
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{
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return(FALSE);
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}
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}
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#ifdef __GNUC__
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__asm__ __volatile__("cli");
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#else
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asm("cli");
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#endif /* __GNUC__ */
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if (!ExtendedEnabled)
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{
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RESET_IOPL();
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}
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return(TRUE);
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}
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void
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xf86EnableInterrupts()
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{
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if (!ExtendedEnabled)
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{
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if (SET_IOPL() < 0)
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{
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return;
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}
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}
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#ifdef __GNUC__
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__asm__ __volatile__("sti");
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#else
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asm("sti");
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#endif /* __GNUC__ */
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if (!ExtendedEnabled)
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{
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RESET_IOPL();
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}
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return;
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}
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