x86/fred: Fix INT80 emulation for FRED

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Add a FRED-specific INT80 handler and document why it differs from the
current one. Eventually, the common bits will be unified once FRED hw is
available and it turns out that no further changes are needed but for
now, keep the handlers separate for everyone's sanity's sake.

  [ bp: Zap duplicated commit message, massage. ]

Fixes: 55617fb991 ("x86/entry: Do not allow external 0x80 interrupts")
Suggested-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li (Intel) <xin@zytor.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240417174731.4189592-1-xin@zytor.com

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Xin Li (Intel) 2024-04-17 10:47:31 -07:00 • committed by Borislav Petkov (AMD)

parent 6376306add

commit 32f5f73b79

2 changed files with 66 additions and 1 deletions

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65

arch/x86/entry/common.c

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2

arch/x86/entry/entry_fred.c

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