132 lines
2.7 KiB
C
132 lines
2.7 KiB
C
/* Copyright (c) 2024 Barcelona Supercomputing Center (BSC)
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* SPDX-License-Identifier: MIT
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* Author: Rodrigo Arias Mallo <rodrigo.arias@bsc.es> */
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/* Small utility to dump the state of the PLIC. */
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/* Changelog:
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* v0.0.1 (2024-09-03): Initial version.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <errno.h>
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const char *plic_address_str = "0x40800000";
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long ncontexts = 15872L;
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long maxsources = 1024L;
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long nsources = 1024L;
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static void
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usage(void)
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{
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printf("plictool v0.0.1 - Rodrigo Arias Mallo <rodrigo.arias@bsc.es>\n");
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printf(
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"Usage: plictool [-a addr] [-s nsources] [-c ncontexts]\n");
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exit(1);
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}
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void dump_sources(void *base)
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{
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for (long s = 0; s < nsources; s++) {
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int printed_source = 0;
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uint32_t *pending_reg = base + 0x1000L + (s / 32L) * 4L;
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long shift = s % 32L;
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uint32_t pending = ((*pending_reg) >> shift) & 1;
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uint32_t *priority_reg = base + 0x0000L + (s * 4L);
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uint32_t priority = *priority_reg;
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const char *fmt =
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"src=%ld pend=%u prio=%u";
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if (pending || priority) {
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printf(fmt, s, pending, priority);
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printed_source = 1;
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}
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int first_context = 1;
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for (long c = 0; c < ncontexts; c++) {
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uint32_t *enable_reg = base + 0x2000L + 0x80L * c + (s / 32L) * 4L;
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uint32_t enabled = ((*enable_reg) >> shift) & 1;
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uint32_t *threshold_reg = base + 0x200000L + (c * 0x1000L);
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uint32_t threshold = *threshold_reg;
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if (!enabled)
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continue;
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if (!printed_source) {
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printf(fmt, s, pending, priority);
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printed_source = 1;
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}
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printf(" ctx=%ld thre=%u", c, threshold);
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}
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if (printed_source)
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printf("\n");
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}
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}
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int main(int argc, char *argv[])
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{
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int opt;
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while ((opt = getopt(argc, argv, "a:hs:c:")) != -1) {
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switch (opt) {
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case 'a':
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plic_address_str = optarg;
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break;
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case 's':
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nsources = atol(optarg);
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break;
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case 'c':
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ncontexts = atol(optarg);
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break;
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case 'h':
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default: /* '?' */
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usage();
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}
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}
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off_t plic_address = (off_t) strtoll(plic_address_str, NULL, 16);
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printf("plic=0x%08x nsources=%ld ncontexts=%ld\n",
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plic_address, nsources, ncontexts);
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int fd = open("/dev/mem", O_RDWR | O_SYNC);
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if (fd == -1) {
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perror("cannot open /dev/mem");
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exit(1);
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}
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size_t map_size = 0x4000000UL;
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void *map_base = mmap(0, map_size, PROT_READ | PROT_WRITE, MAP_SHARED,
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fd, plic_address);
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if (map_base == MAP_FAILED) {
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perror("mmap failed");
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if (errno == EPERM) {
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fprintf(stderr, "Have you disabled 'CONFIG_STRICT_DEVMEM' and "
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"'CONFIG_IO_STRICT_DEVMEM' in the kernel config?\n"
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"Hint: zgrep STRICT_DEVMEM /proc/config.gz\n");
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}
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exit(1);
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}
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dump_sources(map_base);
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munmap(map_base, map_size);
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close(fd);
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return 0;
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}
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