Added some paging functionality

2 files changed, 28 insertions, 0 deletions

diff --git a/src/kernel/paging/paging.c b/src/kernel/paging/paging.c
new file mode 100644
index 0000000..164372e
--- /dev/null
+++ b/src/kernel/paging/paging.c
@@ -0,0 +1,22 @@
+#include <stdint.h>
+
+uint64_t page_dir_ptr_tab[4] __attribute__((aligned(0x20)));
+uint64_t page_dir[512] __attribute__((aligned(0x1000)));
+uint64_t page_tab[512] __attribute__((aligned(0x1000)));
+
+void enable_paging() {
+    page_dir_ptr_tab[0] = (uint64_t) &page_dir | 1;
+    page_dir[0] = (uint64_t) &page_tab | 3;
+
+    unsigned int i, address = 0;
+    for (i = 0; i < 512; i++) {
+        page_tab[i] = address | 3;
+        address = address + 0x1000;
+    }
+
+    asm volatile ("cli");
+    asm volatile ("movl %cr4, %eax; bts $5, %eax; movl %eax, %cr4"); // CRASH
+    asm volatile ("movl %%eax, %%cr3"::"a" (&page_dir_ptr_tab));
+    asm volatile ("movl %cr0, %eax; orl $0x80000000, %eax; movl %eax, %cr0;");
+    asm volatile ("sti");
+}
\ No newline at end of file
diff --git a/src/kernel/paging/paging.h b/src/kernel/paging/paging.h
new file mode 100644
index 0000000..e8c3bf4
--- /dev/null
+++ b/src/kernel/paging/paging.h
@@ -0,0 +1,6 @@
+#ifndef MELVIX_PAGING_H
+#define MELVIX_PAGING_H
+
+void enable_paging();
+
+#endif