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    Subject[PATCH v12 17/37] x86/fred: Add a new header file for FRED definitions
    Date
    From: "H. Peter Anvin (Intel)" <hpa@zytor.com>

    Add a header file for FRED prototypes and definitions.

    Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
    Tested-by: Shan Kang <shan.kang@intel.com>
    Signed-off-by: Xin Li <xin3.li@intel.com>
    ---

    Changes since v6:
    * Replace pt_regs csx flags prefix FRED_CSL_ with FRED_CSX_.
    ---
    arch/x86/include/asm/fred.h | 68 +++++++++++++++++++++++++++++++++++++
    1 file changed, 68 insertions(+)
    create mode 100644 arch/x86/include/asm/fred.h

    diff --git a/arch/x86/include/asm/fred.h b/arch/x86/include/asm/fred.h
    new file mode 100644
    index 000000000000..f514fdb5a39f
    --- /dev/null
    +++ b/arch/x86/include/asm/fred.h
    @@ -0,0 +1,68 @@
    +/* 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 */
    --
    2.34.1
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