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//
// cpuctl.c
// system_cmds
//
// Copyright (c) 2019 Apple Inc. All rights reserved.
//
#include <err.h>
#include <getopt.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
typedef char *kobject_description_t[512];
#include <mach/mach.h>
static void usage()
{
printf("usage: cpuctl [ list ]\n");
printf(" cpuctl { offline | online } <cpu> [ <cpu>... ]\n");
exit(EX_USAGE);
}
static void fetch_cpu_info(host_t *priv_port,
processor_port_array_t proc_ports,
mach_msg_type_number_t proc_count,
processor_basic_info_data_t *cpus)
{
for (int i = 0; i < proc_count; i++) {
mach_msg_type_number_t info_count = PROCESSOR_BASIC_INFO_COUNT;
if (processor_info(proc_ports[i], PROCESSOR_BASIC_INFO, priv_port,
(processor_info_t)&cpus[i], &info_count) != KERN_SUCCESS) {
errx(EX_OSERR, "processor_info(%d) failed", i);
}
}
}
static int do_cmd_list(mach_msg_type_number_t proc_count, processor_basic_info_data_t *cpus)
{
int prev_lowest = -1;
for (int i = 0; i < proc_count; i++) {
int lowest_slot = INT_MAX;
int lowest_idx = -1;
for (int j = 0; j < proc_count; j++) {
int slot = cpus[j].slot_num;
if (slot > prev_lowest && slot < lowest_slot) {
lowest_slot = slot;
lowest_idx = j;
}
}
if (lowest_idx == -1)
errx(EX_OSERR, "slot numbers are out of range");
processor_basic_info_data_t *cpu = &cpus[lowest_idx];
printf("CPU%d: %-7s type=%x,%x master=%d\n",
cpu->slot_num,
cpu->running ? "online" : "offline",
cpu->cpu_type,
cpu->cpu_subtype,
cpu->is_master);
prev_lowest = lowest_slot;
}
return 0;
}
static int find_cpu_by_slot(mach_msg_type_number_t proc_count,
processor_basic_info_data_t *cpus,
int slot)
{
for (int i = 0; i < proc_count; i++) {
if (cpus[i].slot_num == slot)
return i;
}
return -1;
}
int main(int argc, char **argv)
{
int opt;
while ((opt = getopt(argc, argv, "h")) != -1) {
switch (opt) {
case 'h':
usage();
}
}
host_t priv_port;
if (host_get_host_priv_port(mach_host_self(), &priv_port) != KERN_SUCCESS)
errx(EX_OSERR, "host_get_host_priv_port() failed");
processor_port_array_t proc_ports;
mach_msg_type_number_t proc_count;
if (host_processors(priv_port, &proc_ports, &proc_count) != KERN_SUCCESS)
errx(EX_OSERR, "host_processors() failed");
processor_basic_info_data_t *cpus = calloc(proc_count, sizeof(*cpus));
if (!cpus)
errx(EX_OSERR, "calloc() failed");
fetch_cpu_info(&priv_port, proc_ports, proc_count, cpus);
if (optind == argc)
return do_cmd_list(proc_count, cpus);
const char *cmd = argv[optind];
optind++;
if (!strcmp(cmd, "list"))
return do_cmd_list(proc_count, cpus);
bool up = true;
if (!strncmp(cmd, "off", 3))
up = false;
else if (strncmp(cmd, "on", 2))
usage();
if (optind == argc)
usage();
int ret = 0;
for (; optind < argc; optind++) {
char *endp = NULL;
int slot = (int)strtoul(argv[optind], &endp, 0);
if (*endp != 0)
usage();
int cpu = find_cpu_by_slot(proc_count, cpus, slot);
if (cpu == -1)
errx(EX_USAGE, "Invalid CPU ID %d", slot);
if (up) {
if (processor_start(proc_ports[cpu]) != KERN_SUCCESS)
errx(EX_OSERR, "processor_start(%u) failed", cpu);
} else {
if (processor_exit(proc_ports[cpu]) != KERN_SUCCESS)
errx(EX_OSERR, "processor_exit(%u) failed", cpu);
}
}
return ret;
}
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