Add claim support in plictool
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JOURNAL.md
31
JOURNAL.md
@ -4311,3 +4311,34 @@ helpful.
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For that I need to first switch to the 8250/16550 driver. Let's try switch to
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the ttyS0 without enabling flow control yet. We probably need to change the
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stage1 and stage2 scripts to follow the proper console device.
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It works, but very slowly:
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[ 0.000000] Kernel command line: root=/dev/ram0 loglevel=7 rw earlycon=sbi console=ttyS0,115200n8 debug2 ...
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...
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[ 42.069358] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
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[ 42.473860] of_serial 40001000.serial: error -ENXIO: IRQ index 0 not found
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[ 42.559263] printk: legacy console [ttyS0] disabled
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[ 42.614225] 40001000.serial: ttyS0 at MMIO 0x40001000 (irq = 0, base_baud = 3125000) is a 16550
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[ 42.645519] printk: legacy console [ttyS0] enabled
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[ 42.645519] printk: legacy console [ttyS0] enabled
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[ 42.656865] printk: legacy bootconsole [sbi0] disabled
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[ 42.656865] printk: legacy bootconsole [sbi0] disabled
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[ 42.896358] 40003000.serial: ttyS1 at MMIO 0x40003000 (irq = 1, base_baud = 3125000) is a 16550
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[ 42.999450] SuperH (H)SCI(F) driver initialized
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...
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~ # stty -a
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speed 115200 baud;stty: standard input
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line = 0;
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intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
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eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
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werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
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-parenb -parodd -cmspar cs8 hupcl -cstopb cread clocal -crtscts
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-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff
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-iuclc -ixany -imaxbel -iutf8
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opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
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isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt
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echoctl echoke -flusho -extproc
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Let's add the ability to claim a context in the plictool, as I suspect the claim
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may be broken.
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@ -8,9 +8,10 @@
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* v0.0.1 (2024-09-03): Initial version.
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* v0.0.2 (2024-09-04): Print contexts in another line and masked information.
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* v0.0.3 (2024-09-04): Make output format more clear and add manual.
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* v0.0.4 (2024-09-30): Implement support for claiming an interrupt.
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*/
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#define VERSION "v0.0.3"
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#define VERSION "v0.0.4"
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#include <stdio.h>
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#include <stdlib.h>
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@ -21,10 +22,12 @@
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#include <sys/mman.h>
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#include <errno.h>
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enum op { DUMP, CLAIM } operation = DUMP;
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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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long claim_ctx = 0;
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static void
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usage(void)
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@ -34,7 +37,7 @@ usage(void)
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" plictool - dump PLIC information\n"
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"\n"
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"SYNOPSIS\n"
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" plictool [-a addr] [-s nsources] [-c ncontexts]\n"
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" plictool [-a addr] [-s nsources] [-c ncontexts] [-C ctx]\n"
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"\n"
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"DESCRIPTION\n"
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" Dumps information about the RISC-V PLIC interrupt controller.\n"
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@ -49,6 +52,8 @@ usage(void)
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" -c ncontexts Limit the number of contexts to print.\n"
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" The default is 15872.\n"
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"\n"
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" -C ctx Claim the interrupt on the given context.\n"
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"\n"
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"OUTPUT FORMAT\n"
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" Information is printed for each source that has some bit set\n"
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" in the pending or priority registers, or it has some context\n"
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@ -75,7 +80,31 @@ usage(void)
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exit(1);
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}
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void dump_sources(void *base)
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static uint32_t
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read_reg(void *base, size_t offset)
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{
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volatile uint32_t *p = base + offset;
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return *p;
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}
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static void
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write_reg(void *base, size_t offset, uint32_t value)
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{
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volatile uint32_t *p = base + offset;
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*p = value;
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}
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static void
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claim_interrupt(void *base, long ctx)
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{
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size_t offset = 0x200004L + ctx * 0x1000;
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uint32_t value = read_reg(base, offset);
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printf("ctx=%ld claim=%u\n", ctx, value);
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write_reg(base, offset, value);
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}
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static void
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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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@ -133,7 +162,7 @@ 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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while ((opt = getopt(argc, argv, "a:hs:c: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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@ -144,6 +173,10 @@ int main(int argc, char *argv[])
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case 'c':
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ncontexts = atol(optarg);
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break;
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case 'C':
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operation = CLAIM;
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claim_ctx = 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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@ -177,7 +210,10 @@ int main(int argc, char *argv[])
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exit(1);
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}
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dump_sources(map_base);
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if (operation == CLAIM)
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claim_interrupt(map_base, claim_ctx);
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else if (operation == DUMP)
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dump_sources(map_base);
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munmap(map_base, map_size);
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