arch: add SET_CR3 assembly macro

The macro preserves RAX register via stack, but does not clean the stack. Signed-off-by: Pawel Wieczorkiewicz <[email protected]>
KernelTestFramework · Jul 11, 2022 · 9cf5fe5 · 9cf5fe5
1 parent f53bfa1
commit 9cf5fe5
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/include/arch/x86/asm-macros.h b/include/arch/x86/asm-macros.h
@@ -152,6 +152,13 @@
 #endif
 .endm
 
+.macro SET_CR3 val
+    push %_ASM_AX
+    mov (\val), %_ASM_AX
+    mov %_ASM_AX, %cr3
+    pop %_ASM_AX
+.endm
+
 #define GLOBAL(name) \
     .global name;    \
 name: