diff options
| author | H. Peter Anvin (Intel) <hpa@zytor.com> | 2023-12-09 13:42:14 -0800 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-01-31 22:02:31 +0100 |
| commit | 14619d912b658ecd9573fb88400d3830a29cadcb (patch) | |
| tree | 8de248a587245122eba294060ec9ec98c98b0d2e /arch/x86/include/asm/fred.h | |
| parent | ffa4901f0e004e1a0a4e18a2452a1fcc27277cc0 (diff) | |
| download | lwn-14619d912b658ecd9573fb88400d3830a29cadcb.tar.gz lwn-14619d912b658ecd9573fb88400d3830a29cadcb.zip | |
x86/fred: FRED entry/exit and dispatch code
The code to actually handle kernel and event entry/exit using
FRED. It is split up into two files thus:
- entry_64_fred.S contains the actual entrypoints and exit code, and
saves and restores registers.
- entry_fred.c contains the two-level event dispatch code for FRED.
The first-level dispatch is on the event type, and the second-level
is on the event vector.
[ bp: Fold in an allmodconfig clang build fix:
https://lore.kernel.org/r/20240129064521.5168-1-xin3.li@intel.com
and a CONFIG_IA32_EMULATION=n build fix:
https://lore.kernel.org/r/20240127093728.1323-3-xin3.li@intel.com]
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Originally-by: Megha Dey <megha.dey@intel.com>
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/20231209214214.2932-1-xin3.li@intel.com
Diffstat (limited to 'arch/x86/include/asm/fred.h')
| -rw-r--r-- | arch/x86/include/asm/fred.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/include/asm/fred.h b/arch/x86/include/asm/fred.h index f514fdb5a39f..16a64ffecbf8 100644 --- a/arch/x86/include/asm/fred.h +++ b/arch/x86/include/asm/fred.h @@ -60,6 +60,12 @@ static __always_inline unsigned long fred_event_data(struct pt_regs *regs) return fred_info(regs)->edata; } +void asm_fred_entrypoint_user(void); +void asm_fred_entrypoint_kernel(void); + +__visible void fred_entry_from_user(struct pt_regs *regs); +__visible void fred_entry_from_kernel(struct pt_regs *regs); + #else /* CONFIG_X86_FRED */ static __always_inline unsigned long fred_event_data(struct pt_regs *regs) { return 0; } #endif /* CONFIG_X86_FRED */ |