Commit 24261de4 authored by Liu Jingqi's avatar Liu Jingqi Committed by Eduardo Habkost
Browse files

x86/cpu: Enable MOVDIRI cpu feature 

MOVDIRI moves doubleword or quadword from register to memory through
direct store which is implemented by using write combining (WC) for
writing data directly into memory without caching the data.

The bit definition:
CPUID.(EAX=7,ECX=0):ECX[bit 27] MOVDIRI

The release document ref below link:
https://software.intel.com/sites/default/files/managed/c5/15/\


architecture-instruction-set-extensions-programming-reference.pdf

Cc: Xu Tao <tao3.xu@intel.com>
Signed-off-by: default avatarLiu Jingqi <jingqi.liu@intel.com>
Message-Id: <1541488407-17045-2-git-send-email-jingqi.liu@intel.com>
Signed-off-by: default avatarEduardo Habkost <ehabkost@redhat.com>
parent 32a1a94d

target/i386/cpu.c

+1 −1
Original line number Diff line number Diff line
@@ -1023,7 +1023,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = { 
            "avx512bitalg", NULL, "avx512-vpopcntdq", NULL,

            "la57", NULL, NULL, NULL,

            NULL, NULL, "rdpid", NULL,

            NULL, "cldemote", NULL, NULL,

            NULL, "cldemote", NULL, "movdiri",

            NULL, NULL, NULL, NULL,

        },

        .cpuid = {

target/i386/cpu.h

+1 −0
Original line number Diff line number Diff line
@@ -687,6 +687,7 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS]; 
#define CPUID_7_0_ECX_LA57     (1U << 16)

#define CPUID_7_0_ECX_RDPID    (1U << 22)

#define CPUID_7_0_ECX_CLDEMOTE (1U << 25)  /* CLDEMOTE Instruction */

#define CPUID_7_0_ECX_MOVDIRI  (1U << 27)  /* MOVDIRI Instruction */



#define CPUID_7_0_EDX_AVX512_4VNNIW (1U << 2) /* AVX512 Neural Network Instructions */

#define CPUID_7_0_EDX_AVX512_4FMAPS (1U << 3) /* AVX512 Multiply Accumulation Single Precision */