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Add claim support in plictool

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This commit is contained in:
Rodrigo Arias
2024-09-30 11:55:57 +02:00
parent cae948e923
commit 44a6ef47b8
2 changed files with 72 additions and 5 deletions
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46
tools/plictool.c
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@@ -8,9 +8,10 @@
* v0.0.1 (2024-09-03): Initial version.
* v0.0.2 (2024-09-04): Print contexts in another line and masked information.
* v0.0.3 (2024-09-04): Make output format more clear and add manual.
* v0.0.4 (2024-09-30): Implement support for claiming an interrupt.
*/
#define VERSION "v0.0.3"
#define VERSION "v0.0.4"
#include <stdio.h>
#include <stdlib.h>
@@ -21,10 +22,12 @@
#include <sys/mman.h>
#include <errno.h>
enum op { DUMP, CLAIM } operation = DUMP;
const char *plic_address_str = "0x40800000";
long ncontexts = 15872L;
long maxsources = 1024L;
long nsources = 1024L;
long claim_ctx = 0;
static void
usage(void)
@@ -34,7 +37,7 @@ usage(void)
" plictool - dump PLIC information\n"
"\n"
"SYNOPSIS\n"
" plictool [-a addr] [-s nsources] [-c ncontexts]\n"
" plictool [-a addr] [-s nsources] [-c ncontexts] [-C ctx]\n"
"\n"
"DESCRIPTION\n"
" Dumps information about the RISC-V PLIC interrupt controller.\n"
@@ -49,6 +52,8 @@ usage(void)
" -c ncontexts Limit the number of contexts to print.\n"
" The default is 15872.\n"
"\n"
" -C ctx Claim the interrupt on the given context.\n"
"\n"
"OUTPUT FORMAT\n"
" Information is printed for each source that has some bit set\n"
" in the pending or priority registers, or it has some context\n"
@@ -75,7 +80,31 @@ usage(void)
exit(1);
}
void dump_sources(void *base)
static uint32_t
read_reg(void *base, size_t offset)
{
volatile uint32_t *p = base + offset;
return *p;
}
static void
write_reg(void *base, size_t offset, uint32_t value)
{
volatile uint32_t *p = base + offset;
*p = value;
}
static void
claim_interrupt(void *base, long ctx)
{
size_t offset = 0x200004L + ctx * 0x1000;
uint32_t value = read_reg(base, offset);
printf("ctx=%ld claim=%u\n", ctx, value);
write_reg(base, offset, value);
}
static void
dump_sources(void *base)
{
for (long s = 0; s < nsources; s++) {
int printed_source = 0;
@@ -133,7 +162,7 @@ int main(int argc, char *argv[])
{
int opt;
while ((opt = getopt(argc, argv, "a:hs:c:")) != -1) {
while ((opt = getopt(argc, argv, "a:hs:c:C:")) != -1) {
switch (opt) {
case 'a':
plic_address_str = optarg;
@@ -144,6 +173,10 @@ int main(int argc, char *argv[])
case 'c':
ncontexts = atol(optarg);
break;
case 'C':
operation = CLAIM;
claim_ctx = atol(optarg);
break;
case 'h':
default: /* '?' */
usage();
@@ -177,7 +210,10 @@ int main(int argc, char *argv[])
exit(1);
}
dump_sources(map_base);
if (operation == CLAIM)
claim_interrupt(map_base, claim_ctx);
else if (operation == DUMP)
dump_sources(map_base);
munmap(map_base, map_size);