mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 04:50:57 +07:00
b428b51ed9
Fix commit 5f4c6bc1f3: it spits out warnings
about missing syscall prototype (it is in <unistd.h>) and it does not
recognize that two uses of _syscallX are to be resolved against kernel
headers in the source tree, not against _syscallX; they in fact do not
compile and would not work anyway.
If _syscallX macros will be removed from the kernel tree altogether, the
only reasonable solution for that piece of code is switching to open-coded
inline assembly (it's remapping the whole executable from memory, except
the page containing this code).
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
37 lines
829 B
C
37 lines
829 B
C
#include <errno.h>
|
|
#include <linux/unistd.h>
|
|
|
|
#include <sys/syscall.h>
|
|
#include <unistd.h>
|
|
|
|
#include "sysdep/tls.h"
|
|
#include "user_util.h"
|
|
|
|
/* Checks whether host supports TLS, and sets *tls_min according to the value
|
|
* valid on the host.
|
|
* i386 host have it == 6; x86_64 host have it == 12, for i386 emulation. */
|
|
void check_host_supports_tls(int *supports_tls, int *tls_min) {
|
|
/* Values for x86 and x86_64.*/
|
|
int val[] = {GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64};
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(val); i++) {
|
|
user_desc_t info;
|
|
info.entry_number = val[i];
|
|
|
|
if (syscall(__NR_get_thread_area, &info) == 0) {
|
|
*tls_min = val[i];
|
|
*supports_tls = 1;
|
|
return;
|
|
} else {
|
|
if (errno == EINVAL)
|
|
continue;
|
|
else if (errno == ENOSYS)
|
|
*supports_tls = 0;
|
|
return;
|
|
}
|
|
}
|
|
|
|
*supports_tls = 0;
|
|
}
|