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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/runtime/enableavx.greg.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 net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "ape/lib/pc.h"
#include "libc/dce.h"
#include "libc/nexgen32e/nexgen32e.h"
#include "libc/nt/struct/context.h"
#include "libc/nt/thunk/msabi.h"
#define kNtContextXstate 0x00100040
#define kNtXstateAvx 2
#define kNtXstateMaskAvx (1ull << kNtXstateAvx)
static void EnableAvx(void) {
asm volatile("mov\t%%cr4,%%rax\n\t"
"or\t%0,%%rax\n\t"
"mov\t%%rax,%%cr4\n\t"
"xor\t%%ecx,%%ecx\n\t"
"xgetbv\n\t"
"or\t%1,%%eax\n\t"
"xsetbv"
: /* no outputs */
: "i"(CR4_OSXSAVE), "i"(XCR0_X87 | XCR0_SSE | XCR0_AVX)
: "rax", "rcx", "rdx", "memory", "cc");
}
static void EnableAvxOnWindows(void) {
/* typedef uint64_t (*getenabledxstatefeatures_f)(void) __msabi; */
/* typedef bool32 (*initializecontext_f)(void *buffer, uint32_t flags, */
/* struct NtContext **out_context, */
/* uint32_t *inout_buffersize) __msabi;
*/
/* typedef bool32 (*getxstatefeaturesmask_f)(struct NtContext * context, */
/* uint64_t * out_featuremask)
* __msabi; */
/* typedef bool32 (*setxstatefeaturesmask_f)(struct NtContext * context, */
/* uint64_t featuremask) __msabi; */
/* getenabledxstatefeatures_f GetEnabledXStateFeatures; */
/* initializecontext_f InitializeContext; */
/* getxstatefeaturesmask_f GetXStateFeaturesMask; */
/* setxstatefeaturesmask_f SetXStateFeaturesMask; */
}
/**
* Requests authorization from operating system to do 256-bit math.
* @assume avx cpuid check performed by caller
*/
int _init_enableavx(void) {
if (IsMetal()) {
EnableAvx();
} else if (IsWindows()) {
EnableAvxOnWindows();
}
return 0;
}