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    Subject[PATCH v4 06/23] powerpc/32s: Create C version of kuap_user/kernel_restore() and friends
    Date
    In preparation of porting PPC32 to C syscall entry/exit,
    create C version of kuap_user_restore() and kuap_kernel_restore()
    and kuap_check() and kuap_get_and_check() on book3s/32.

    Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
    ---
    arch/powerpc/include/asm/book3s/32/kup.h | 33 ++++++++++++++++++++++++
    1 file changed, 33 insertions(+)

    diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h
    index a0117a9d5b06..a3e72e1141c5 100644
    --- a/arch/powerpc/include/asm/book3s/32/kup.h
    +++ b/arch/powerpc/include/asm/book3s/32/kup.h
    @@ -103,6 +103,39 @@ static inline void kuap_update_sr(u32 sr, u32 addr, u32 end)
    isync(); /* Context sync required after mtsrin() */
    }

    +static inline void kuap_user_restore(struct pt_regs *regs)
    +{
    +}
    +
    +static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap)
    +{
    + u32 addr = kuap & 0xf0000000;
    + u32 end = kuap << 28;
    +
    + if (unlikely(!kuap))
    + return;
    +
    + current->thread.kuap = 0;
    + kuap_update_sr(mfsrin(addr) & ~SR_KS, addr, end); /* Clear Ks */
    +}
    +
    +static inline void kuap_check(void)
    +{
    + if (!IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
    + return;
    +
    + WARN_ON_ONCE(current->thread.kuap != 0);
    +}
    +
    +static inline unsigned long kuap_get_and_check(void)
    +{
    + unsigned long kuap = current->thread.kuap;
    +
    + WARN_ON_ONCE(IS_ENABLED(CONFIG_PPC_KUAP_DEBUG) && kuap != 0);
    +
    + return kuap;
    +}
    +
    static __always_inline void allow_user_access(void __user *to, const void __user *from,
    u32 size, unsigned long dir)
    {
    --
    2.25.0
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