152 lines
3.6 KiB
C
152 lines
3.6 KiB
C
/*
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*
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* Copyright © 1999 Keith Packard
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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 name of Keith Packard 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. Keith Packard makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* KEITH PACKARD 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 KEITH PACKARD 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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*/
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#include <kdrive-config.h>
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#include "kdrive.h"
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#include <errno.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#ifdef HAVE_ASM_MTRR_H
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#include <asm/mtrr.h>
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#endif
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#include <sys/ioctl.h>
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void *KdMapDevice(CARD32 addr, CARD32 size)
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{
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#ifdef linux
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void *a;
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int fd;
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#ifdef __arm__
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fd = open("/dev/mem", O_RDWR | O_SYNC);
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#else
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fd = open("/dev/mem", O_RDWR);
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#endif
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if (fd < 0)
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FatalError("KdMapDevice: failed to open /dev/mem (%s)\n",
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strerror(errno));
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a = mmap((caddr_t) 0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
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addr);
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close(fd);
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if ((long)a == -1)
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FatalError("KdMapDevice: failed to map frame buffer (%s)\n",
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strerror(errno));
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return a;
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#endif
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}
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void KdUnmapDevice(void *addr, CARD32 size)
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{
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#ifdef linux
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munmap(addr, size);
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#endif
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}
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#ifdef HAVE_ASM_MTRR_H
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static int mtrr;
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#endif
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void KdSetMappedMode(CARD32 addr, CARD32 size, int mode)
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{
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#ifdef HAVE_ASM_MTRR_H
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struct mtrr_sentry sentry;
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unsigned long base, bound;
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unsigned int type = MTRR_TYPE_WRBACK;
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if (addr < 0x100000)
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return;
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if (!mtrr)
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mtrr = open("/proc/mtrr", 2);
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if (mtrr > 0) {
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unsigned long nsize;
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base = addr & ~((1 << 22) - 1);
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bound = ((addr + size) + ((1 << 22) - 1)) & ~((1 << 22) - 1);
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nsize = 1;
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while (nsize < (bound - base))
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nsize <<= 1;
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switch (mode) {
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case KD_MAPPED_MODE_REGISTERS:
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type = MTRR_TYPE_UNCACHABLE;
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break;
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case KD_MAPPED_MODE_FRAMEBUFFER:
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type = MTRR_TYPE_WRCOMB;
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break;
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}
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sentry.base = base;
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sentry.size = nsize;
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sentry.type = type;
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if (ioctl(mtrr, MTRRIOC_ADD_ENTRY, &sentry) < 0)
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ErrorF("MTRRIOC_ADD_ENTRY failed 0x%lx 0x%lx %d (errno %d)\n",
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base, bound - base, type, errno);
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}
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#endif
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}
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void KdResetMappedMode(CARD32 addr, CARD32 size, int mode)
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{
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#ifdef HAVE_ASM_MTRR_H
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struct mtrr_sentry sentry;
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unsigned long base, bound;
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unsigned int type = MTRR_TYPE_WRBACK;
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if (addr < 0x100000)
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return;
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if (!mtrr)
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mtrr = open("/proc/mtrr", 2);
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if (mtrr > 0) {
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unsigned long nsize;
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base = addr & ~((1 << 22) - 1);
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bound = ((addr + size) + ((1 << 22) - 1)) & ~((1 << 22) - 1);
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nsize = 1;
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while (nsize < (bound - base))
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nsize <<= 1;
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switch (mode) {
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case KD_MAPPED_MODE_REGISTERS:
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type = MTRR_TYPE_UNCACHABLE;
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break;
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case KD_MAPPED_MODE_FRAMEBUFFER:
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type = MTRR_TYPE_WRCOMB;
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break;
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}
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sentry.base = base;
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sentry.size = nsize;
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sentry.type = type;
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if (ioctl(mtrr, MTRRIOC_DEL_ENTRY, &sentry) < 0)
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ErrorF("MTRRIOC_DEL_ENTRY failed 0x%lx 0x%lx %d (errno %d)\n",
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base, bound - base, type, errno);
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}
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#endif
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}
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