Feat: lab 3 w/o adv 2

kernel/include/utils.h

@@ -45,8 +45,16 @@ void exit(int);
 
 #define W_SYSREG(reg, val) \
   asm volatile( \
-    "msr " #reg ", %[a]" \
+    "mov x0, %[a]" ENDL \
+    "msr " #reg ", x0" ENDL \
     :: [a] "r" (val) \
+    : "x0" \
+  )
+
+#define W_SYSREG_IMM(reg, val) \
+  asm volatile( \
+    "msr " #reg ", %[a]" \
+    :: [a] "i" (val) \
   )
 
 #define R_REG(ret, reg) \
@@ -54,3 +62,17 @@ void exit(int);
     "mov %[a], " #reg \
     : [a] "=r" (ret) \
   )
+
+#define W_REG(reg, val) \
+  asm volatile( \
+    "mov " #reg ", %[a]" \
+    :: [a] "r" (val) \
+  )
+
+#define MMIO_W_HELPER(name, reg, mask, offset) \
+  static inline void name(uint64_t state) \
+  { *reg = (*reg & ~((mask) << (offset))) | ((state & (mask)) << (offset)); }
+
+#define MMIO_R_HELPER(name, reg, mask, offset) \
+  static inline uint64_t name(void) \
+  { return (*reg >> (offset)) & (mask); }