First commit

1 files changed, 42 insertions, 0 deletions

diff --git a/src/stem/paging.h b/src/stem/paging.h
new file mode 100644
index 0000000..87ba183
--- /dev/null
+++ b/src/stem/paging.h
@@ -0,0 +1,42 @@
+#ifndef DEF_PAGING_H
+#define DEF_PAGING_H
+
+#include "types.h"
+#include "idt.h"
+
+struct page {
+	uint32_t present	: 1;	//Page mapped to a frame ?
+	uint32_t rw			: 1;	//Page read/write ?
+	uint32_t user		: 1;	//Page user readable ?
+	uint32_t accessed	: 1;	//Was page accessed ?
+	uint32_t dirty		: 1;	//Was page modified ?
+	uint32_t unused		: 7;
+	uint32_t frame		: 20;	//Frame address (physical address)
+};
+
+struct page_table {
+	struct page pages[1024];
+};
+
+struct page_directory {
+	struct page_table *tables[1024];	//Virtual addresses of page tables
+	uint32_t *tablesPhysical;			//Pointer to the virtual address of the page directory (contain phys addr of pt)
+	uint32_t physicalAddr;				//Physical address of info above
+};
+
+extern struct page_directory *kernel_pagedir;
+
+uint32_t frame_alloc();
+void frame_free(uint32_t id);
+
+void paging_init(size_t totalRam);
+void paging_cleanup();
+void pagedir_switch(struct page_directory *pd);
+struct page *pagedir_getPage(struct page_directory *pd, uint32_t address, int make);
+void page_map(struct page *page, uint32_t frame, uint32_t user, uint32_t rw);
+void page_unmap(struct page *page);
+void page_unmapFree(struct page *page);
+
+uint32_t paging_fault(struct registers *regs);	//returns a boolean
+
+#endif