mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-23 10:15:57 +01:00
56738a1c70
Unsquashed version at v2-rc-unsquashed, but that cannot be merged as it breaks bisects at several points. All bugs will not bisect to this humongous change. It all started with a conversion of the Bash scripts to Python, mainly because I couldn't stand not being able to properly use --options for run which has a million options. Then since that required a full testing, I decided to do all the refactorings that I had in mind at once, and so I did and it became v2-rc. This is the largest patch I have ever done! OMG a few weeks of extra time. I'm never writing a Bash script for anything that starts getting big again. Some of the features are: * separate build-qemu and build-gem5 commands * common: convert scripts to python. Add --option for everything * rename build to build-buildroot now that we are splitting all the build commands, Linux kernel to follow * move all git submodules to submodules/ and all buildroot packages to packages/ * refactor the out/ structure. Keep projects on toplevel, because guest projects separate archs and host ones don't, making a toplevel arch wrong * do-release: rename to just release https://stackoverflow.com/questions/16174992/cant-get-argparse-to-read-quoted-string-with-dashes-in-it * run: add --terminal and explain gem5 pdb * just track the lvimrc * store CLI kernel config fragment inside buildlroot to avoid conflicts * gem5: document m5 initparam * readme: make a bunch of things awesomer * readme: fix broken refs * parsec-benchmark: update to 75d55ac446a43c47efb1044844a108c6c330184c Could not fetch otherwise. * gem5: M5_OVERRIDE_PY_SOURCE
112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
/* https://github.com/cirosantilli/linux-kernel-module-cheat#uio */
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#if 1
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/* Adapted from: https://yurovsky.github.io/2014/10/10/linux-uio-gpio-interrupt */
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#define _XOPEN_SOURCE 700
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#include <fcntl.h> /* open */
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h> /* write */
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#include <assert.h>
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#include <sys/mman.h>
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int main(int argc, char **argv)
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{
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char *dev = "/dev/uio0";
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if (argc > 1) {
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dev = argv[1];
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exit(EXIT_FAILURE);
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}
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int fd = open(dev, O_RDWR);
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if (fd < 0) {
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perror("open");
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exit(EXIT_FAILURE);
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}
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/* TODO not supported by this kernel module? */
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/*int *addr = mmap(NULL, sysconf(_SC_PAGE_SIZE), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);*/
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/*if (addr == MAP_FAILED) {*/
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/*perror("mmap");*/
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/*assert(0);*/
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/*}*/
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/**addr = 0x12345678;*/
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while (1) {
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uint32_t info = 1;
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size_t nb = write(fd, &info, sizeof(info));
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if (nb < sizeof(info)) {
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perror("write");
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close(fd);
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exit(EXIT_FAILURE);
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}
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nb = read(fd, &info, sizeof(info));
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if (nb == sizeof(info)) {
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printf(__FILE__ " read = %u\n", info);
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}
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}
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}
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#else
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/* Ripped from the kernel docs. */
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#define _XOPEN_SOURCE 700
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <unistd.h>
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int main()
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{
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int uiofd;
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int configfd;
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int err;
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int i;
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unsigned icount;
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unsigned char command_high;
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uiofd = open("/dev/uio0", O_RDONLY);
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if (uiofd < 0) {
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perror("uio open:");
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return errno;
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}
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configfd = open("/sys/class/uio/uio0/device/config", O_RDWR);
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if (configfd < 0) {
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perror("config open:");
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return errno;
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}
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err = pread(configfd, &command_high, 1, 5);
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if (err != 1) {
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perror("command config read:");
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return errno;
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}
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command_high &= ~0x4;
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for(i = 0;; ++i) {
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fprintf(stderr, "Interrupts: %d\n", icount);
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err = pwrite(configfd, &command_high, 1, 5);
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if (err != 1) {
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perror("config write:");
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break;
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}
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err = read(uiofd, &icount, 4);
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if (err != 4) {
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perror("uio read:");
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break;
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}
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}
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return errno;
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}
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#endif
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