x86-64.net

Intel Atom and E-cores

Airmont

Intel Airmont (2015) supports x86-64-v2.

x86-64 level
x86-64-v2
Vendor
Intel
First products
2015
Products
Atom x5 and x7 (Cherry Trail); Celeron and Pentium N3000/J3000 (Braswell)
Segments
desktopmobileembedded
GCC target
-march=silvermont
Optimization
Optimizing code for Silvermont to Goldmont Plus

GCC has no separate -march for Airmont: its table of processor models selects -march=silvermont for it. Intel's product pages list AES-NI for every Airmont part cited here, which -march=silvermont, and so this entry, leaves out.

Product lines

The product lines built on Airmont, with the market segment the vendor sells each in and the sockets or soldered (BGA) packages its processors come in. Each socket links to the vendor page that states it.
Product lineSegmentSocketSource
Atom x5 and x7 Z8000 (Cherry Trail)mobileBGA1380, BGA592intel.com
Pentium and Celeron N3000 (Braswell)mobileBGA1170intel.com
Pentium and Celeron J3000 (Braswell)desktopBGA1170intel.com
Atom x5-E8000 (Braswell)embeddedBGA1170intel.com

Why not x86-64-v3?

Airmont lacks AVX, AVX2, BMI1, BMI2, F16C, FMA, LZCNT and XSAVE, all of which x86-64-v3 requires.

Feature checklist

Features required by each x86-64 level and whether Airmont has them. OSFXSR and OSXSAVE are set by the operating system; the table checks the hardware features they depend on.
FeatureAirmontEnumerated byLinux flag
x86-64-v1
CMOVYesCPUID.01H:EDX[15]cmov
CX8YesCPUID.01H:EDX[8]cx8
FPUYesCPUID.01H:EDX[0]fpu
FXSRYesCPUID.01H:EDX[24]fxsr
MMXYesCPUID.01H:EDX[23]mmx
OSFXSR via FXSRYesCPUID.01H:EDX[24]fxsr
SCEYesCPUID.80000001H:EDX[11]syscall
SSEYesCPUID.01H:EDX[25]sse
SSE2YesCPUID.01H:EDX[26]sse2
x86-64-v2
CMPXCHG16BYesCPUID.01H:ECX[13]cx16
LAHF-SAHFYesCPUID.80000001H:ECX[0]lahf_lm
POPCNTYesCPUID.01H:ECX[23]popcnt
SSE3YesCPUID.01H:ECX[0]pni
SSE4.1YesCPUID.01H:ECX[19]sse4_1
SSE4.2YesCPUID.01H:ECX[20]sse4_2
SSSE3YesCPUID.01H:ECX[9]ssse3
x86-64-v3
AVXNoCPUID.01H:ECX[28]avx
AVX2NoCPUID.(EAX=07H,ECX=0):EBX[5]avx2
BMI1NoCPUID.(EAX=07H,ECX=0):EBX[3]bmi1
BMI2NoCPUID.(EAX=07H,ECX=0):EBX[8]bmi2
F16CNoCPUID.01H:ECX[29]f16c
FMANoCPUID.01H:ECX[12]fma
LZCNTNoCPUID.80000001H:ECX[5]abm
MOVBEYesCPUID.01H:ECX[22]movbe
OSXSAVE via XSAVENoCPUID.01H:ECX[26]xsave
x86-64-v4
AVX512FNoCPUID.(EAX=07H,ECX=0):EBX[16]avx512f
AVX512BWNoCPUID.(EAX=07H,ECX=0):EBX[30]avx512bw
AVX512CDNoCPUID.(EAX=07H,ECX=0):EBX[28]avx512cd
AVX512DQNoCPUID.(EAX=07H,ECX=0):EBX[17]avx512dq
AVX512VLNoCPUID.(EAX=07H,ECX=0):EBX[31]avx512vl

Other extensions

Notable extensions outside the x86-64 levels. Vendors sometimes disable these on individual models. Linked names lead to the extension's instructions.

Known vulnerabilities

The CVEs that the sources of the vulnerability list name as affecting Airmont, in all of its models or in some of them.

  • CVE-2019-11091 Microarchitectural Data Sampling: Microarchitectural Data Sampling Uncacheable Memory Some models
  • CVE-2018-12130 Microarchitectural Data Sampling: Microarchitectural Fill Buffer Data Sampling Some models
  • CVE-2018-12127 Microarchitectural Data Sampling: Microarchitectural Load Port Data Sampling Some models
  • CVE-2018-12126 Microarchitectural Data Sampling: Microarchitectural Store Buffer Data Sampling
  • CVE-2017-5754 Meltdown: Rogue Data Cache Load
  • CVE-2017-5753 Spectre variant 1: Bounds Check Bypass
  • CVE-2017-5715 Spectre variant 2: Branch Target Injection

Sources

  1. GCC -march=silvermont (processor alias table)
  2. GCC gcc/common/config/i386/cpuinfo.h: Airmont (models 4CH, 5AH and 75H) selects -march=silvermont
  3. Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 4, 335592-093, Table 2-1: Model 06_4CH: Atom x7-Z8000 and x5-Z8000 series, Airmont microarchitecture.
  4. Intel ARK: Products formerly Cherry Trail: Launch dates; the earliest is Q1'15 (Atom x5-Z8500).
  5. Linux 7.3 arch/x86/include/asm/intel-family.h: INTEL_ATOM_AIRMONT (Cherry Trail, Braswell)
  6. Intel ARK: Intel Atom x5-Z8350 Processor: Intel AES New Instructions: Yes.
  7. Intel ARK: Intel Atom x7-Z8750 Processor: Intel AES New Instructions: Yes.
  8. Intel ARK: Intel Atom x5-E8000 Processor: Intel AES New Instructions: Yes.
  9. Intel ARK: Intel Celeron Processor N3050: Intel AES New Instructions: Yes.
  10. Intel ARK: Intel Celeron Processor J3160: Intel AES New Instructions: Yes.