x86/fred: Add FRED initialization functions

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Add cpu_init_fred_exceptions() to:
  - Set FRED entrypoints for events happening in ring 0 and 3.
  - Specify the stack level for IRQs occurred ring 0.
  - Specify dedicated event stacks for #DB/NMI/#MCE/#DF.
  - Enable FRED and invalidtes IDT.
  - Force 32-bit system calls to use "int $0x80" only.

Add fred_complete_exception_setup() to:
  - Initialize system_vectors as done for IDT systems.
  - Set unused sysvec_table entries to fred_handle_spurious_interrupt().

Co-developed-by: Xin Li <xin3.li@intel.com>
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Shan Kang <shan.kang@intel.com>
Link: https://lore.kernel.org/r/20231205105030.8698-35-xin3.li@intel.com

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H. Peter Anvin (Intel) 2023-12-05 02:50:23 -08:00 • committed by Borislav Petkov (AMD)

parent 530dce278a

commit cdd99dd873

4 changed files with 86 additions and 0 deletions

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21

arch/x86/entry/entry_fred.c

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5

arch/x86/include/asm/fred.h

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1

arch/x86/kernel/Makefile

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59

arch/x86/kernel/fred.c

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