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powerpc/8xx: Create C version of kuap save/restore/check helpers 

In preparation of porting PPC32 to C syscall entry/exit,
create C version of kuap_save_and_lock() and kuap_user_restore() and
kuap_kernel_restore() and kuap_assert_locked() and
kuap_get_and_assert_locked() on 8xx.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156a7c4b669d26785391422a5581a1d919544c9a.1615552867.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-03-12 12:50:50 +00:00 committed by Michael Ellerman
parent 21eb58ae4f
commit 0b45359aa2
1 changed files with 31 additions and 0 deletions
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31
arch/powerpc/include/asm/nohash/32/kup-8xx.h
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@ -34,6 +34,37 @@
#include <asm/reg.h>
static inline void kuap_save_and_lock(struct pt_regs *regs)
{
regs->kuap = mfspr(SPRN_MD_AP);
mtspr(SPRN_MD_AP, MD_APG_KUAP);
}
static inline void kuap_user_restore(struct pt_regs *regs)
{
}
static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap)
{
mtspr(SPRN_MD_AP, regs->kuap);
}
static inline unsigned long kuap_get_and_assert_locked(void)
{
unsigned long kuap = mfspr(SPRN_MD_AP);
if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
WARN_ON_ONCE(kuap >> 16 != MD_APG_KUAP >> 16);
return kuap;
}
static inline void kuap_assert_locked(void)
{
if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
kuap_get_and_assert_locked();
}
static inline void allow_user_access(void __user *to, const void __user *from,
unsigned long size, unsigned long dir)
{