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https://www.kernel.org/doc/html/latest/arm/vfp/release-notes.html
This is the first release of the Linux Kernel VFP support code. It provides support for the exceptions bounced from VFP hardware found on ARM926EJ-S. This release has been validated against the SoftFloat-2b library by John R. Hauser using the TestFloat-2a test suite. Details of this library and test suite can be found at:
https://www.kernel.org/doc/html/latest/arm/kernel_mode_neon.html
VFP and support code¶ Earlier versions of VFP (prior to version 3) rely on software support for things like IEEE-754 compliant underflow handling etc. When the VFP unit needs such software assistance, it signals the kernel by raising an undefined instruction exception.
https://www.kernel.org/doc/html/latest/arm/index.html
The Linux Kernel 5.5.0 The Linux kernel user’s and administrator’s guide; Kernel Build System; The Linux kernel firmware guide ... Release notes for Linux Kernel VFP support code; ARM64 Architecture; IA-64 Architecture; m68k Architecture; MIPS-specific Documentation; Linux on the Nios II architecture;
https://stackoverflow.com/questions/21946881/any-disadvantages-to-enabling-vfp-in-the-linux-kernel
The kernel disables VFP/Neon for a task and when an instruction executes, it traps to an undefined instructions, the Neon/VFP is noted, enabled and code resumes as per normal. When it is flagged as active, then state is stored. The only disadvantage is slightly larger page-locked kernel code. – artless noise Feb 24 '14 at 21:35
https://www.kernel.org/doc/html/v5.4-preprc-cpu/arm/index.html
The Linux Kernel master-eb094f0 The Linux kernel user’s and administrator’s guide; Kernel Build System; The Linux kernel firmware guide ... Release notes for Linux Kernel VFP support code; ARM64 Architecture; IA-64 Architecture; m68k Architecture; MIPS-specific Documentation; Linux on …
https://www.kernel.org/doc/html/latest/arm/marvel.html
ARM Marvell SoCs¶. This document lists all the ARM Marvell SoCs that are currently supported in mainline by the Linux kernel. As the Marvell families of SoCs are large and complex, it is hard to understand where the support for a particular SoC is available in the Linux kernel.
http://lkml.iu.edu/hypermail/linux/kernel/1101.1/02782.html
> When the VFP support code tests the state of the VFP hardware during boot, > it sets the VFP handler to point at vfp_testing_entry, bypassing the normal > VFP handling code, and executes a VFP instruction. > > If this VFP instruction faults (eg, because there is no VFP hardware > present or we're not permitted to use it), it could end up resuming
https://unix.stackexchange.com/questions/184874/how-do-determine-whether-linux-board-is-using-hardware-fpu-or-not
VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 4 If VFP isn't fully supported, the kernel will instead log. VFP support v0.3: not present or. VFP support v0.3: no double precision support As to whether your Python interpreter is capable of using this, it appears to depend mainly on the architecture of your ARM Linux ...
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