diff options
Diffstat (limited to 'lib/libc/x86/sys/pkru.c')
| -rw-r--r-- | lib/libc/x86/sys/pkru.c | 138 |
1 files changed, 0 insertions, 138 deletions
diff --git a/lib/libc/x86/sys/pkru.c b/lib/libc/x86/sys/pkru.c deleted file mode 100644 index 28ce93389fd0..000000000000 --- a/lib/libc/x86/sys/pkru.c +++ /dev/null @@ -1,138 +0,0 @@ -/*- - * Copyright (c) 2019 The FreeBSD Foundation - * All rights reserved. - * - * Portions of this software were developed by Konstantin Belousov - * under sponsorship from the FreeBSD Foundation. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include <sys/param.h> -#include <machine/cpufunc.h> -#include <machine/specialreg.h> -#include <machine/sysarch.h> -#include <x86/ifunc.h> -#include <errno.h> -#include <string.h> - -#define MAX_PKRU_IDX 0xf -#ifdef __i386__ -#define X86_SET_PKRU I386_SET_PKRU -#define X86_CLEAR_PKRU I386_CLEAR_PKRU -#else -#define X86_SET_PKRU AMD64_SET_PKRU -#define X86_CLEAR_PKRU AMD64_CLEAR_PKRU -#endif - -static int -x86_pkru_get_perm_unsup(u_int keyidx, int *access, int *modify) -{ - - errno = EOPNOTSUPP; - return (-1); -} - -static int -x86_pkru_get_perm_hw(u_int keyidx, int *access, int *modify) -{ - uint32_t pkru; - - if (keyidx > MAX_PKRU_IDX) { - errno = EINVAL; - return (-1); - } - keyidx *= 2; - pkru = rdpkru(); - *access = (pkru & (1 << keyidx)) == 0; - *modify = (pkru & (2 << keyidx)) == 0; - return (0); -} - -DEFINE_UIFUNC(, int, x86_pkru_get_perm, (u_int, int *, int *)) -{ - - return ((cpu_stdext_feature2 & CPUID_STDEXT2_OSPKE) == 0 ? - x86_pkru_get_perm_unsup : x86_pkru_get_perm_hw); -} - -static int -x86_pkru_set_perm_unsup(u_int keyidx, int access, int modify) -{ - - errno = EOPNOTSUPP; - return (-1); -} - -static int -x86_pkru_set_perm_hw(u_int keyidx, int access, int modify) -{ - uint32_t pkru; - - if (keyidx > MAX_PKRU_IDX) { - errno = EINVAL; - return (-1); - } - keyidx *= 2; - pkru = rdpkru(); - pkru &= ~(3 << keyidx); - if (!access) - pkru |= 1 << keyidx; - if (!modify) - pkru |= 2 << keyidx; - wrpkru(pkru); - return (0); -} - -DEFINE_UIFUNC(, int, x86_pkru_set_perm, (u_int, int, int)) -{ - - return ((cpu_stdext_feature2 & CPUID_STDEXT2_OSPKE) == 0 ? - x86_pkru_set_perm_unsup : x86_pkru_set_perm_hw); -} - -int -x86_pkru_protect_range(void *addr, unsigned long len, u_int keyidx, int flags) -{ - struct amd64_set_pkru a64pkru; - - memset(&a64pkru, 0, sizeof(a64pkru)); - a64pkru.addr = addr; - a64pkru.len = len; - a64pkru.keyidx = keyidx; - a64pkru.flags = flags; - return (sysarch(X86_SET_PKRU, &a64pkru)); -} - -int -x86_pkru_unprotect_range(void *addr, unsigned long len) -{ - struct amd64_set_pkru a64pkru; - - memset(&a64pkru, 0, sizeof(a64pkru)); - a64pkru.addr = addr; - a64pkru.len = len; - return (sysarch(X86_CLEAR_PKRU, &a64pkru)); -} |