89 lines
3.5 KiB
ArmAsm
89 lines
3.5 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
|
│vi: set et ft=asm ts=8 sw=8 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/macros.h"
|
|
#include "libc/nexgen32e/kcpuids.h"
|
|
#include "libc/nexgen32e/x86feature.h"
|
|
|
|
/ Globally precomputed CPUID.
|
|
/
|
|
/ This module lets us check CPUID in 0.06ns rather than 51.00ns.
|
|
/ If every piece of native software linked this module, then the
|
|
/ world would be a much better place; since all the alternatives
|
|
/ are quite toilsome.
|
|
/
|
|
/ @see www.felixcloutier.com/x86/cpuid
|
|
.initbss 201,_init_kCpuids
|
|
kCpuids:.long 0,0,0,0 # EAX=0 (Basic Processor Info)
|
|
.long 0,0,0,0 # EAX=1 (Processor Info)
|
|
.long 0,0,0,0 # EAX=2
|
|
.long 0,0,0,0 # EAX=7 (Extended Features)
|
|
.long 0,0,0,0 # EAX=0x80000001 (NexGen32e)
|
|
.long 0,0,0,0 # EAX=0x80000007 (APM)
|
|
.long 0,0,0,0 # EAX=16h (CPU Frequency)
|
|
.endobj kCpuids,globl
|
|
.previous
|
|
|
|
.init.start 201,_init_kCpuids
|
|
push %rbx
|
|
push $0
|
|
push $0x16
|
|
push $0xffffffff80000007
|
|
push $0xffffffff80000001
|
|
push $7
|
|
push $2
|
|
push $1
|
|
mov %rdi,%r8
|
|
xor %eax,%eax
|
|
1: xor %ecx,%ecx
|
|
cpuid
|
|
stosl
|
|
xchg %eax,%ebx
|
|
stosl
|
|
xchg %eax,%ecx
|
|
stosl
|
|
xchg %eax,%edx
|
|
stosl
|
|
2: pop %rax
|
|
test %eax,%eax # EAX = stacklist->pop()
|
|
jz 3f # EAX ≠ 0 (EOL sentinel)
|
|
cmp KCPUIDS(0H,EAX)(%r8),%al # EAX ≤ CPUID.0 max leaf
|
|
jbe 1b # CPUID too new to probe
|
|
add $4*4,%rdi
|
|
jmp 2b
|
|
3: nop
|
|
#if !X86_NEED(AVX2)
|
|
testb X86_HAVE(AVX)(%r8)
|
|
jz 5f
|
|
testb X86_HAVE(OSXSAVE)(%r8)
|
|
jz 4f
|
|
xor %ecx,%ecx
|
|
xgetbv
|
|
and $XCR0_SSE|XCR0_AVX,%eax
|
|
cmp $XCR0_SSE|XCR0_AVX,%eax
|
|
je 5f
|
|
4: btr $X86_BIT(AVX),X86_WORD(AVX)(%r8)
|
|
btr $X86_BIT(AVX2),X86_WORD(AVX2)(%r8)
|
|
#endif
|
|
5: pop %rbx
|
|
.init.end 201,_init_kCpuids
|
|
.source __FILE__
|