mm: enable paging and add some test code

Enable paging in the CPU and add some testing code to check
virtual addresses are being redirected.

Signed-off-by: Carlos Maiolino <[email protected]>

1 files changed, 26 insertions, 9 deletions

diff --git a/src/kernel.c b/src/kernel.c
index 1605191..01de04f 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -6,6 +6,9 @@
 #include <toxic/idt.h>
 #include <toxic/io.h>
 #include <mm/kernel_heap.h>
+#include <mm/paging.h>
+
+static struct page_directory *kernel_directory;
 
 void start_kernel()
 {
@@ -16,19 +19,33 @@ void start_kernel()
 	kernel_heap_init();
 	interrupts_init();
 
+	kernel_directory = paging_new_directory(PAGING_IS_WRITABLE |
+					  PAGING_IS_PRESENT  |
+					  PAGING_USER_ACCESS);
+
+	paging_switch(kernel_directory);
+
+	char *ptr = kzalloc(4096);
+	char *ptr2;
+
+	paging_map_vaddr(kernel_directory, (void *)0x1000,
+		   ptr,
+		   (PAGING_USER_ACCESS |
+		   PAGING_IS_PRESENT | PAGING_IS_WRITABLE));
+
+	enable_paging();
 	enable_interrupts();
 
+	ptr2 = (char *) 0x1000;
+	ptr[0] = 'A';
+	vprintl(ptr);
+	vprintl(ptr2);
 
-	void *ptr = kmalloc(50);
-	void *ptr2 = kmalloc(5000);
-	void *ptr3 = kmalloc(5600);
+	ptr2[1] = 'B';
+	vprintl("new ptr\n");
+	vprintl(ptr);
+	vprintl(ptr2);
 
-	*((int *)ptr) = 11;
 	kfree(ptr);
-	void *ptr4 = kmalloc(50);
 
-	*((int *)ptr2) = 22;
-	*((int *)ptr3) = 33;
-	*((int *)ptr4) = 44;
-	if (ptr || ptr2 || ptr3 || ptr4) {}
 }