(VERY BROKEN) Enable paging

[nameless-os.git] / kernel / kernel.c

diff --git a/kernel/kernel.c b/kernel/kernel.c
index 4c6efd8692da90d7ab15cf782846b3194e9483f7..b274340cd2605ca7a905579cf06f0b32adbf8d99 100644 (file)
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -3,21 +3,48 @@
 #include <irq/idt.h>
 #include <irq/i8259a.h>
 #include <stdint.h>
+#include <mm/paging.h>
 
 extern void double_fault(struct abort_frame *frame);
 extern void keyb_handler(struct interrupt_frame *frame);
-struct idt_descriptor idt[256] __attribute__((aligned(0x10)));
-struct idtr idtr __attribute__((aligned(0x10)));
+extern void pf_handler(struct fault_frame *frame);
+static struct idt_descriptor idt[256] __attribute__((aligned(0x10)));
+static struct idtr idtr __attribute__((aligned(0x10)));
+
+static struct page_directory_entry page_dir[1024] __attribute__((aligned(0x1000)));
+static struct page_table_entry page_table[1024] __attribute__((aligned(0x1000)));
 
 void kmain(void)
 {
        screen_clear();
        kprint("Welcome to Nameless OS!\nRunning revision: ", 0);
        kprint(GIT_COMMIT, 0);
-       kprint("\n", 0);
+       kprint("\nEnabling paging...\n", 0);
+       for (int i=0xb8; i < 0xc0; i++) {
+               page_table[i].p = 1;
+               page_table[i].rw = 0;
+               page_table[i].us = 0;
+               page_table[i].page_frame_addr = i;
+       }
+       for (int i=0x100; i < 0x102; i++) {
+               page_table[i].p = 1;
+               page_table[i].rw = 0;
+               page_table[i].us = 0;
+               page_table[i].page_frame_addr = i;
+       }
+       for (int i=0x102; i < 0x110; i++) {
+               page_table[i].p = 1;
+               page_table[i].rw = 1;
+               page_table[i].us = 0;
+               page_table[i].page_frame_addr = i;
+       }
+       page_dir[0].p = 1;
+       page_dir[0].page_table_addr = (int) &page_table >> 12;
+       enable_paging(page_dir);
        kprint("Preparing IDT...\n", 0);
-       idt_set_descriptor(idt, 0x8, 0x8, (uint32_t) double_fault, IDT_TRAP_GATE, 0x0);
-       idt_set_descriptor(idt, 0x21, 0x8, (uint32_t) keyb_handler, IDT_INTERRUPT_GATE, 0x0);
+       idt_set_descriptor(idt, 8, 0x8, (uint32_t) double_fault, IDT_INTERRUPT_GATE, 0x0);
+       idt_set_descriptor(idt, 14, 0x8, (uint32_t) pf_handler, IDT_INTERRUPT_GATE, 0x0);
+       idt_set_descriptor(idt, 33, 0x8, (uint32_t) keyb_handler, IDT_INTERRUPT_GATE, 0x0);
        kprint("IDT prepared, loading...\n", 0);
        populate_idtr(&idtr, idt);
        load_idt(idtr);
@@ -27,5 +54,12 @@ void kmain(void)
        pic_unmask(1);
        asm volatile ("sti");
        kprint("All done\n", 0);
+       struct idtr curr_idtr;
+       asm ("sidt %0": "=m" (curr_idtr));
+       kprintw(curr_idtr.limit);
+       kprintd(curr_idtr.base);
+       //kprint("Gonna force a double fault\n", 0);
+       //int test = 1/0;
+       //int test2 = *(int *) (0xa0000000);
        while(1);
 }