add VIA PadLock emulation

[Torinde]

VIA PadLock instructions

• RNG
• AES
• SHA-1
• SHA-256
• SHA-512, SM2, XRNG2, ZXPAUSE
• Montgomery Multiplication
• SM3
• SM4

[Torinde]

@stlintel

relevant only for VIA CPU. If we want to add some VIA CPU model to Bochs (which one?) you may try to list all the gaps and we might build a plan how to close them. Not all the gaps have to be closed immediately, even for most recent Intel models there are blindspots which are not urgent or necessary.

There are some documentation sources in the link above.
CPUID info: here and here.

Model - I suggest the latest, for which there is info (CPUID dump from instlatx64): YongFeng (KH-40000). Gaps:

• PREFETCHWT1
• SMX - Safer Mode Extensions (LaGrande) (GETSEC instruction)
• PadLock
  • RNG
  • ACE
  • ACE2
  • PHE (SHA1/256)
  • PMM (MONTMUL)
  • GMI (SM3/4)
  • XSHA512
  • XSTORE(C1..C7)
  • XRNG2
  • SM2
  • RSA (XMODEXP / MONTMUL2)

Remaining VIA items (probably for the next CPU: ZX-F, KX-7000):

• ZXPAUSE
• SEM / SME ??
• STK ??

[Torinde]

PCBox emulates RNG and ACE.