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x86/fred: Add a new header file for FRED definitions

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Add a header file for FRED prototypes and definitions.

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/20231205105030.8698-16-xin3.li@intel.com
This commit is contained in:
H. Peter Anvin (Intel) 2023-12-05 02:50:04 -08:00 committed by Borislav Petkov (AMD)
parent 3c77bf02d0
commit 32b09c2303
1 changed files with 68 additions and 0 deletions
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68
arch/x86/include/asm/fred.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Macros for Flexible Return and Event Delivery (FRED)
*/
#ifndef ASM_X86_FRED_H
#define ASM_X86_FRED_H
#include <linux/const.h>
#include <asm/asm.h>
/*
* FRED event return instruction opcodes for ERET{S,U}; supported in
* binutils >= 2.41.
*/
#define ERETS _ASM_BYTES(0xf2,0x0f,0x01,0xca)
#define ERETU _ASM_BYTES(0xf3,0x0f,0x01,0xca)
/*
* RSP is aligned to a 64-byte boundary before used to push a new stack frame
*/
#define FRED_STACK_FRAME_RSP_MASK _AT(unsigned long, (~0x3f))
/*
* Used for the return address for call emulation during code patching,
* and measured in 64-byte cache lines.
*/
#define FRED_CONFIG_REDZONE_AMOUNT 1
#define FRED_CONFIG_REDZONE (_AT(unsigned long, FRED_CONFIG_REDZONE_AMOUNT) << 6)
#define FRED_CONFIG_INT_STKLVL(l) (_AT(unsigned long, l) << 9)
#define FRED_CONFIG_ENTRYPOINT(p) _AT(unsigned long, (p))
#ifndef __ASSEMBLY__
#ifdef CONFIG_X86_FRED
#include <linux/kernel.h>
#include <asm/ptrace.h>
struct fred_info {
/* Event data: CR2, DR6, ... */
unsigned long edata;
unsigned long resv;
};
/* Full format of the FRED stack frame */
struct fred_frame {
struct pt_regs regs;
struct fred_info info;
};
static __always_inline struct fred_info *fred_info(struct pt_regs *regs)
{
return &container_of(regs, struct fred_frame, regs)->info;
}
static __always_inline unsigned long fred_event_data(struct pt_regs *regs)
{
return fred_info(regs)->edata;
}
#else /* CONFIG_X86_FRED */
static __always_inline unsigned long fred_event_data(struct pt_regs *regs) { return 0; }
#endif /* CONFIG_X86_FRED */
#endif /* !__ASSEMBLY__ */
#endif /* ASM_X86_FRED_H */