create a separate library for kernel code that should run in PL0 mode

1 files changed, 19 insertions, 5 deletions

diff --git a/memory.h b/memory.h
index 1472a8b..2211c9d 100644
--- a/memory.h
+++ b/memory.h
@@ -1,6 +1,10 @@
 #ifndef MEMORY_H
 #define MEMORY_H
 
+#include "paging.h"
+
+#define SECTION_SIZE (((uint32_t) 1) << 20)
+
 #define INTERRUPT_VECTOR_TABLE_START ((uint32_t) 0x0)
 
 #define STACK_START ((uint32_t) 0x4000)
@@ -20,11 +24,21 @@ extern char __start;
 #define TRANSLATION_TABLE_END				\
   (TRANSLATION_TABLE_BASE + (uint32_t) (4096 * 4))
 
-#define PRIVILEGED_MEMORY_END TRANSLATION_TABLE_END
+#define LIBKERNEL_SECTION_START					\
+  (((TRANSLATION_TABLE_END - (uint32_t) 1) & ~((uint32_t) 0xfffff))	\
+   + SECTION_SIZE)
+
+#define LIBKERNEL_SECTION_END			\
+  (LIBKERNEL_SECTION_START + SECTION_SIZE)
 
-#define UNPRIVILEGED_MEMORY_START					\
-  (((PRIVILEGED_MEMORY_END - (uint32_t) 1) & ~((uint32_t) 0xfffff))	\
-   + (uint32_t) 0x100000)
+// section for libkernel is flat-mapped
+#define LIBKERNEL_SECTION_NUMBER (LIBKERNEL_SECTION_START >> 20)
+
+#define PRIVILEGED_MEMORY_END LIBKERNEL_SECTION_END
+
+#define UNPRIVILEGED_MEMORY_START PRIVILEGED_MEMORY_END
+#define UNPRIVILEGED_MEMORY_END			\
+  (UNPRIVILEGED_MEMORY_START + SECTION_SIZE)
 
 #define PL0_SECTION_NUMBER     ((uint32_t) 0b101010101010)
 #define PL0_SECTION_NUMBER_STR "0b101010101010"
@@ -32,4 +46,4 @@ extern char __start;
 #define VIRTUAL_PL0_MEMORY_START (PL0_SECTION_NUMBER << 20)
 
 #endif // MEMORY_H
- 
+