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.le...@csgroup.eu>
---
arch/powerpc/include/asm/nohash/32/kup-8xx.h | 31 ++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/arch/powerpc/include/asm/nohash/32/kup-8xx.h
b/arch/powerpc/include/asm/nohash/32/kup-8xx.h
index 17a4a616436f..e6b5ebca47e5 100644
--- a/arch/powerpc/include/asm/nohash/32/kup-8xx.h
+++ b/arch/powerpc/include/asm/nohash/32/kup-8xx.h
@@ -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)
{
--
2.25.0
