kernel: Rename set/clear_ac to arch_cpu_enable/disable_user_access.

These are architecture-specific routines, so they deserve proper
architecture-specific naming. The user memory access routines are
already under arch_cpu (arch_cpu_user_memcpy, etc.), and the methods
usually change a CPU flag, so it makes sense to put these there too.

RISC-V had get_ac but nothing else defined or used it, so it's removed.

No functional change intended.

Change-Id: Id4715214e32f73d4a93bc7ba8249411a0878d174
Reviewed-on: https://review.haiku-os.org/c/haiku/+/8106
Reviewed-by: waddlesplash <[email protected]>
Reviewed-by: X512 X512 <[email protected]>
Reviewed-by: Jérôme Duval <[email protected]>
Tested-by: Commit checker robot <[email protected]>

headers/private/kernel/arch/arm/arch_cpu.h

@@ -16,8 +16,8 @@
 #define dmb() __asm__ __volatile__("dmb" : : : "memory")
 #define wfi() __asm__ __volatile__("wfi" : : : "memory")
 
-#define set_ac()
-#define clear_ac()
+#define arch_cpu_enable_user_access()
+#define arch_cpu_disable_user_access()
 
 
 #ifndef _ASSEMBLER

headers/private/kernel/arch/arm64/arch_cpu.h

@@ -10,8 +10,8 @@
 #define CACHE_LINE_SIZE 		64
 
 // TODO: These will require a real implementation when PAN is enabled
-#define set_ac()
-#define clear_ac()
+#define arch_cpu_enable_user_access()
+#define arch_cpu_disable_user_access()
 
 #include <kernel/arch/arm64/arm_registers.h>
 

headers/private/kernel/arch/generic/user_memory.h

@@ -65,12 +65,12 @@ bool user_access(Function function)
 	// destructor.
 	auto fail = setjmp(thread_get_current_thread()->fault_handler_state);
 	if (fail == 0) {
-		set_ac();
+		arch_cpu_enable_user_access();
 		function();
-		clear_ac();
+		arch_cpu_disable_user_access();
 		return true;
 	}
-	clear_ac();
+	arch_cpu_disable_user_access();
 	return false;
 }
 

headers/private/kernel/arch/m68k/arch_cpu.h

@@ -18,8 +18,8 @@
 #define CACHE_LINE_SIZE		16
 
 
-#define set_ac()
-#define clear_ac()
+#define arch_cpu_enable_user_access()
+#define arch_cpu_disable_user_access()
 
 
 #define SR_IP_MASK 0x0700

headers/private/kernel/arch/ppc/arch_cpu.h

@@ -15,8 +15,8 @@
 	// 128 Byte lines on PPC970
 
 
-#define set_ac()
-#define clear_ac()
+#define arch_cpu_enable_user_access()
+#define arch_cpu_disable_user_access()
 
 
 struct iframe {

headers/private/kernel/arch/riscv64/arch_cpu.h

@@ -16,22 +16,15 @@
 #define CACHE_LINE_SIZE		64
 
 
-static inline bool
-get_ac()
-{
-	return SstatusReg{.val = Sstatus()}.sum;
-}
-
-
 static inline void
-set_ac()
+arch_cpu_enable_user_access()
 {
 	SetBitsSstatus(SstatusReg{.sum = 1}.val);
 }
 
 
 static inline void
-clear_ac()
+arch_cpu_disable_user_access()
 {
 	ClearBitsSstatus(SstatusReg{.sum = 1}.val);
 }

headers/private/kernel/arch/sparc/arch_cpu.h

@@ -16,8 +16,8 @@
 	// 128 Byte lines on PPC970
 
 
-#define set_ac()
-#define clear_ac()
+#define arch_cpu_enable_user_access()
+#define arch_cpu_disable_user_access()
 
 
 typedef struct arch_cpu_info {

headers/private/kernel/arch/x86/arch_cpuasm.h

@@ -64,10 +64,10 @@ x86_write_cr3(size_t value)
 #define wbinvd() \
 	__asm__ volatile ("wbinvd" : : : "memory")
 
-#define set_ac() \
+#define arch_cpu_enable_user_access() \
 	__asm__ volatile (ASM_STAC : : : "memory")
 
-#define clear_ac() \
+#define arch_cpu_disable_user_access() \
 	__asm__ volatile (ASM_CLAC : : : "memory")
 
 #define xgetbv(reg) ({ \