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Introduce getcpu() system call from glibc

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Justine Tunney 2024-02-21 18:13:30 -08:00
parent 3eb405e0e2
commit 77a92f517b
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7 changed files with 111 additions and 4 deletions
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libc/calls/getcpu.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2024 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/struct/cpuset.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/nexgen32e/rdtscp.h"
#include "libc/nexgen32e/x86feature.h"
#include "libc/nt/struct/processornumber.h"
#include "libc/nt/synchronization.h"
#include "libc/runtime/syslib.internal.h"
#include "libc/sysv/errfuns.h"
int sys_getcpu(unsigned *opt_cpu, unsigned *opt_node, void *tcache);
int getcpu(unsigned *out_opt_cpu, unsigned *out_opt_node) {
unsigned cpu;
unsigned node;
if (X86_HAVE(RDTSCP)) {
unsigned tsc_aux;
rdtscp(&tsc_aux);
cpu = TSC_AUX_CORE(tsc_aux);
node = TSC_AUX_NODE(tsc_aux);
} else if (IsWindows()) {
struct NtProcessorNumber pn;
GetCurrentProcessorNumberEx(&pn);
cpu = 64 * pn.Group + pn.Number;
unsigned short node16;
if (GetNumaProcessorNodeEx(&pn, &node16)) {
node = node16;
} else {
return __winerr();
}
} else if (IsXnuSilicon()) {
if (__syslib->__version >= 9) {
size_t cpu64;
errno_t err = __syslib->__pthread_cpu_number_np(&cpu64);
if (!err) {
cpu = cpu64;
node = 0;
} else {
errno = err;
return -1;
}
} else {
return enosys();
}
} else {
int rc = sys_getcpu(&cpu, &node, 0);
if (rc == -1) return -1;
}
if (out_opt_cpu) {
*out_opt_cpu = cpu;
}
if (out_opt_node) {
*out_opt_node = node;
}
return 0;
}