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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_PKRU_H
#define _ASM_X86_PKRU_H

#include <asm/cpufeature.h>

#define PKRU_AD_BIT 0x1u
#define PKRU_WD_BIT 0x2u
#define PKRU_BITS_PER_PKEY 2

#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
extern u32 init_pkru_value;
#define pkru_get_init_value()    READ_ONCE(init_pkru_value)
#else
#define init_pkru_value    0
#define pkru_get_init_value()    0
#endif

static inline bool __pkru_allows_read(u32 pkru, u16 pkey)
{
    int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
    return !(pkru & (PKRU_AD_BIT << pkru_pkey_bits));
}

static inline bool __pkru_allows_write(u32 pkru, u16 pkey)
{
    int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
    /*
     * Access-disable disables writes too so we need to check
     * both bits here.
     */
    return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits));
}

static inline u32 read_pkru(void)
{
    if (cpu_feature_enabled(X86_FEATURE_OSPKE))
        return rdpkru();
    return 0;
}

static inline void write_pkru(u32 pkru)
{
    if (!cpu_feature_enabled(X86_FEATURE_OSPKE))
        return;
    /*
     * WRPKRU is relatively expensive compared to RDPKRU.
     * Avoid WRPKRU when it would not change the value.
     */
    if (pkru != rdpkru())
        wrpkru(pkru);
}

static inline void pkru_write_default(void)
{
    if (!cpu_feature_enabled(X86_FEATURE_OSPKE))
        return;

    wrpkru(pkru_get_init_value());
}

#endif

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