mirror of
https://github.com/gnif/LookingGlass.git
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139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/**
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* Looking Glass
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* Copyright © 2017-2021 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/syscall.h>
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#include <sys/mman.h>
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#include "kvmfr.h"
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int main(void)
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{
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int page_size = getpagesize();
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int fd = open("/dev/kvmfr0", O_RDWR);
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if (fd < 0)
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{
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perror("open");
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return -1;
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}
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unsigned long size = ioctl(fd, KVMFR_DMABUF_GETSIZE , 0);
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printf("Size: %lu MiB\n", size / 1024 / 1024);
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// mmaping 0-offset dmabuf with 0 offset
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struct kvmfr_dmabuf_create create =
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{
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.flags = KVMFR_DMABUF_FLAG_CLOEXEC,
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.offset = 0x0,
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.size = size,
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};
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int dmaFd = ioctl(fd, KVMFR_DMABUF_CREATE, &create);
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if (dmaFd < 0)
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{
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perror("ioctl");
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return -1;
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}
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void * mem = mmap(NULL, create.size, PROT_READ | PROT_WRITE, MAP_SHARED, dmaFd, 0);
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if (mem == MAP_FAILED)
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{
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perror("mmap on dmabuf with no offset");
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return -1;
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}
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memset(mem, 0xAA, create.size);
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strcpy(mem + page_size, "Hello, world!");
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munmap(mem, create.size);
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// mmaping 0-offset dmabuf with 1 page offset
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mem = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, dmaFd, page_size);
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if (mem == MAP_FAILED)
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{
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perror("mmap on dmabuf with offset");
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return -1;
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}
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printf("Read string: %s\n", (char *) mem);
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munmap(mem, page_size);
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close(dmaFd);
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// mmaping page-offset dmabuf with 0 offset
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create.offset = page_size;
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create.size = 2 * page_size;
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dmaFd = ioctl(fd, KVMFR_DMABUF_CREATE, &create);
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mem = mmap(NULL, create.size, PROT_READ | PROT_WRITE, MAP_SHARED, dmaFd, 0);
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if (mem == MAP_FAILED)
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{
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perror("mmap on offset dmabuf with no offset");
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return -1;
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}
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printf("Read string: %s\n", (char *) mem);
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munmap(mem, create.size);
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// mmaping page-offset dmabuf with 1 page offset
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char *bytes = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, dmaFd, page_size);
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if (bytes == MAP_FAILED)
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{
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perror("mmap on offset dmabuf with offset");
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return -1;
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}
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for (int i = 0; i < page_size; i++)
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if (bytes[i] != (char) 0xAA)
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printf("Index: %d: 0x%02x\n", i, (unsigned) bytes[i]);
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munmap(mem, page_size);
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close(dmaFd);
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// mmaping device with 0 offset
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mem = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, page_size);
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if (mem == MAP_FAILED)
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{
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perror("mmap on file with offset");
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return -1;
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}
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printf("Read string: %s\n", (char *) mem);
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munmap(mem, page_size);
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// mmaping device with 0 offset
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uint32_t *data = mmap(NULL, create.size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if (data == MAP_FAILED)
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{
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perror("mmap on file with no offset");
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return -1;
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}
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for (size_t i = 0; i < create.size / sizeof(uint32_t); i++)
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{
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if (data[i] != 0xAAAAAAAA)
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printf("Index %lu: 0x%08" PRIx32 "\n", i, data[i]);
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}
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munmap(data, create.size);
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close(fd);
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return 0;
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}
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