1 files changed, 72 insertions, 0 deletions
diff --git a/src/memory/memory.h b/src/memory/memory.h
new file mode 100644
index 0000000..bdeba52
--- /dev/null
+++ b/src/memory/memory.h
@@ -0,0 +1,72 @@
+#ifndef MEMORY_H
+#define MEMORY_H
+
+#include <stddef.h>
+
+// These macros were heavily used b4 I moved all the address
+// computation to the linker script. Now I'm just keeping them
+// in case they're needed for something else :)
+#define POWER_OF_2(EXP) (((size_t) 1) << EXP)
+
+#define ALIGN_POWER_OF_2(ADDR, EXP)				\
+  (((ADDR - 1) & ~(POWER_OF_2(EXP) - 1)) + POWER_OF_2(EXP))
+
+#define SECTION_SIZE POWER_OF_2(20)
+
+#define ALIGN_SECTION(ADDR) ALIGN_POWER_OF_2(ADDR, 20)
+
+
+// memory layout
+
+#define INTERRUPT_VECTOR_TABLE_START ((uint32_t) 0x0)
+
+// all those symbols are defined in the linker script
+extern char __end;
+extern char __start;
+extern char _translation_table_start;
+extern char _translation_table_end;
+extern char _sections_list_start;
+extern char _sections_list_end;
+extern char _stack_start;
+extern char _fiq_stack_start;
+extern char _fiq_stack_top;
+extern char _irq_stack_start;
+extern char _irq_stack_top;
+extern char _supervisor_stack_start;
+extern char _supervisor_stack_top;
+extern char _stack_end;
+
+#define KERNEL_START ((size_t) &__start) // this is 0x0
+#define KERNEL_END   ((size_t) &__end)
+
+// first 2^14 aligned address after the kernel
+#define TRANSLATION_TABLE_BASE ((size_t) &_translation_table_start)
+#define TRANSLATION_TABLE_END  ((size_t) &_translation_table_end)
+
+// another 32KB after the translation table are used for sections list
+#define SECTIONS_LIST_START ((size_t) &_sections_list_start)
+#define SECTIONS_LIST_END  ((size_t) &_sections_list_end)
+
+// first section after the translation table is left unused;
+// the next section is used as the stack
+#define STACK_START            ((size_t) &_stack_start)
+#define FIQ_STACK_START        ((size_t) &_fiq_stack_start)
+#define FIQ_STACK_END          ((size_t) &_fiq_stack_top)
+#define IRQ_STACK_START        ((size_t) &_irq_stack_start)
+#define IRQ_STACK_END          ((size_t) &_irq_stack_top)
+#define SUPERVISOR_STACK_START ((size_t) &_supervisor_stack_start)
+#define SUPERVISOR_STACK_END   ((size_t) &_supervisor_stack_top)
+#define STACK_END              ((size_t) &_stack_end)
+
+#define PRIVILEGED_MEMORY_END STACK_END
+
+
+// the following describes the virtual section for our PL0 programs
+#define PL0_SECTION_NUMBER ((size_t) 0xaaa)
+
+#define VIRTUAL_PL0_MEMORY_START (PL0_SECTION_NUMBER << 20)
+#define VIRTUAL_PL0_MEMORY_END			\
+  (VIRTUAL_PL0_MEMORY_START + SECTION_SIZE)
+
+#endif // MEMORY_H
+