paging

kernel/linker.ld

@@ -1,31 +1,40 @@
 ENTRY(start)
 
 SECTIONS {
-	. = 1M;
+
+	. = 0x00100000;
  
     kernel_start = .;
+
+    .multiboot.data : {
+            *(.multiboot.data)
+        }
+
+       .multiboot.text : {
+           *(.multiboot.text)
+       }
+
+	. += 0xC0000000;
 	
-    .boot BLOCK(4K) : ALIGN(4K)
+    .text ALIGN (4K) : AT (ADDR (.text) - 0xC0000000)
-	{
-		*(.multiboot)
-	}
- 
-	.text BLOCK(4K) : ALIGN(4K)
 	{
 		*(.text)
 	}
-	
+	.rodata ALIGN (4K) : AT (ADDR (.rodata) - 0xC0000000)
-    .rodata BLOCK(4K) : ALIGN(4K)
 	{
 		*(.rodata)
 	}
- 
+	.data ALIGN (4K) : AT (ADDR (.data) - 0xC0000000)
- 
-	.bss BLOCK(4K) : ALIGN(4K)
 	{
-		*(.bss)
+		*(.data)
 	}
-    
+	.bss ALIGN (4K) : AT (ADDR (.bss) - 0xC0000000)
+	{
+		*(COMMON)
+		*(.bss)
+		*(.bootstrap_stack)
+	}
+
     kernel_end = .;
 
 }

kernel/src/boot/tag.c

@@ -9,7 +9,6 @@
 static struct BootInfo info;
 
 static void read_cmdline(struct BootTag *tag, char *data, uint8_t len) {
-    debugk("Found cmdline");
     if (len >= CMDLINE_MAX) 
         panic("multiboot2 cmd line to long\nmax is %d but was provided %d\n",
               CMDLINE_MAX, len);
@@ -18,13 +17,11 @@ static void read_cmdline(struct BootTag *tag, char *data, uint8_t len) {
 }
 
 static void read_memorymap(struct BootTag *tag, uint32_t *data) {
-    debugk("Found memorymap");
     tag->data.memory_map = (struct MemoryMap *) data;
     info.tags[iD_MEMORYMAP] = *tag;
 }
 
 static void read_rsdp(struct BootTag *tag, char *data) {
-    debugk("Found RSDP");
     tag->data.rsdp = (struct RootSystemDescriptionPointer *) data;
     info.tags[ID_RSDP] = *tag;
 }
@@ -60,8 +57,6 @@ static uint32_t *read_tag(uint32_t *data) {
 
 void load_boot_info(void* boot_info) {
 
-    debugk("Reading multiboot info");
-
     memset(&info, 0, sizeof(boot_info));
 
     uint32_t* data = (uint32_t*) boot_info;
@@ -72,7 +67,6 @@ void load_boot_info(void* boot_info) {
         data = read_tag(data);
     }
 
-    succek("Loaded multiboot info");
 }
 
 bool get_boot_tag(enum BootTagID id, struct BootTag **tag) {

kernel/src/cpu/cpu.c

@@ -2,19 +2,17 @@
 
 #include "print.h"
 
-extern int sse_init (void);
+extern uint8_t sse_init (void);
-extern int fpu_init (void);
+extern uint8_t fpu_init (void);
 
-void init_registers (void) {
+uint8_t init_registers (uint8_t reg) {
-    if (!sse_init()) {
+    uint8_t res = 0;
-        debugk("Loaded SIMD");
-    } else {
-        errork("SIMD not supported");
-    }
 
-    if (!fpu_init()) {
+    if (reg & SSE_REG) 
-        debugk("Loaded FPU");
+        res |= ~sse_init() & SSE_REG;
-    } else {
+
-        errork("FPU not supported");
+    if (reg & FPU_REG)
-    }
+        res |= ~fpu_init() & FPU_REG;
+
+    return res;
 }

kernel/src/cpu/cpu.h

@@ -1,3 +1,8 @@
 #pragma once
 
-void init_registers (void);
+#include <stdint.h>
+
+#define SSE_REG     0x01
+#define FPU_REG     0x02
+
+uint8_t init_registers (uint8_t reg);

kernel/src/drivers/ps2ctrl.c

@@ -48,8 +48,6 @@ void ps2ctrl_set_port2(void) {
 
 void ps2ctrl_init(void) {
 
-    debugk("Loading PS/2 Controller");
-
     is_init = false;
 
     pic_mask(1); // keyboard
@@ -61,8 +59,7 @@ void ps2ctrl_init(void) {
 	ps2ctrl_out_cmd(0xAA);
 	uint8_t response = ps2ctrl_in();
 	if(response != 0x55) {
-		errork("PS/2 controller failed to initialize");
+		panic("PS/2 controller failed to initialize");
-        return;
 	}
 
 	// set config
@@ -80,8 +77,7 @@ void ps2ctrl_init(void) {
 	ps2ctrl_out_cmd(0xA9);
     response = ps2ctrl_in();
     if (response == 0x01) {
-        errork("PS/2 port 2 not supported");
+        panic("PS/2 port 2 not supported");
-        return;
     }
 
 	ps2ctrl_out_cmd(0xA8);
@@ -90,8 +86,6 @@ void ps2ctrl_init(void) {
 
     pic_unmask(1);
     pic_unmask(12);
-
-    succek("Loaded PS/2 Controller");
 }
 
 bool ps2ctrl_is_init(void) {

kernel/src/drivers/ps2kb.c

@@ -59,8 +59,6 @@ static bool state_ext = false;
 
 void ps2kb_init(void) {
 
-    debugk("Loading PS/2 Keyboard");
-
 	is_init = false;
 	pic_mask(1);
 
@@ -69,24 +67,22 @@ void ps2kb_init(void) {
 	ps2ctrl_out_data(0xFF);
 	result = ps2ctrl_in();
 	if(result != 0xFA) {
-		errork("Failed to reset PS/2 keyboard: expected 0xFA, got 0x%X\n", result);
+		panic("Failed to reset PS/2 keyboard: expected 0xFA, got 0x%X\n", result);
         return;
 	}
 	result = ps2ctrl_in();
 	if(result != 0xAA) {
-		errork("Failed to reset PS/2 keyboard: expected 0xAA, got 0x%X\n", result);
+		panic("Failed to reset PS/2 keyboard: expected 0xAA, got 0x%X\n", result);
         return;
 	}
 
 	ps2ctrl_out_data(0xF4);
 	result = ps2ctrl_in();
 	if(result != 0xFA) {
-	    errork("Failed to enable PS/2 keyboard: expected 0xFA, got 0x%X\n", result);
+	    panic("Failed to enable PS/2 keyboard: expected 0xFA, got 0x%X\n", result);
         return;
 	}
 
-    succek("PS/2 Keyboard has has been loaded");
-
 	pic_unmask(1);
 	is_init = true;
 }

kernel/src/drivers/ps2mouse.c

@@ -15,8 +15,6 @@ static uint8_t first_b, second_b, third_b;
 
 void ps2mouse_init(void) {
 
-    debugk("Loading PS/2 Mouse");
-
     is_init = false;
     pic_mask(12);
 
@@ -26,12 +24,12 @@ void ps2mouse_init(void) {
     ps2ctrl_out_data(0xFF); 
     result = ps2ctrl_in();
     if (result != 0xFA) {
-        errork("Failed to reset PS/2 mouse: expected 0xFA, got 0x%X", result);
+        panic("Failed to reset PS/2 mouse: expected 0xFA, got 0x%X", result);
         return;
     }
     result = ps2ctrl_in();
     if (result != 0xAA) {
-        errork("Failed to reset PS/2 mouse: expected 0xAA, got 0x%X", result);
+        panic("Failed to reset PS/2 mouse: expected 0xAA, got 0x%X", result);
         return;
     }
 
@@ -40,8 +38,6 @@ void ps2mouse_init(void) {
 
     pic_unmask(12);
     is_init = true;
-    
-    succek("PS/2 Mouse has has been loaded");
 }
 
 static uint8_t packet_num = 0;

kernel/src/main.c

@@ -12,12 +12,18 @@
 
 #include <print.h>
 #include <math.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <sys.h>
 
 static double x = 0, y = 0;
 
-void kernel_main(void* boot_info) {
+void kernel_boot(void *boot_info) {
+    (void)boot_info; 
+}
+
+
+void kernel_main(void) {
     
     term_init();
     cursor_enable();
@@ -28,16 +34,16 @@ void kernel_main(void* boot_info) {
     idt_init();
     pic_remap(PIC_REMAP_OFFSET);
 
-    load_boot_info(boot_info);
+    // load_boot_info(boot_info);
-    acpi_init();
+    // acpi_init();
 
-    memory_init();
+    // memory_init();
 
     ps2ctrl_init();
     ps2kb_init();
     ps2mouse_init();
 
-    init_registers();
+    init_registers(FPU_REG | SSE_REG);
 
     while(1) {
         int_wait();

kernel/src/print/panic.c

@@ -20,7 +20,7 @@ void _panic_impl(char* msg, int line, char* file, ...) {
 	vprintk(msg, args);
     if (!term_newline()) putchar('\n');
 	printk("\nin %s at line %d\n", file, line);
-
+    term_flush();
 	while(1) {
 		halt();
 	}

kernel/src/start.asm

@@ -1,6 +1,8 @@
 global start
-global heap_start
+extern kernel_boot
 extern kernel_main
+extern kernel_start
+extern kernel_end
 bits 32
 
 ; base, limit, access, flags
@@ -16,14 +18,18 @@ bits 32
 %endmacro
 
 MAGIC    equ  0xe85250d6
+FLAGS    equ  0
 LENGTH   equ  mb_end - mb_start
 CHECKSUM equ  -(MAGIC + LENGTH)
- 
+
-section .multiboot
+VGABUF   equ  0x000B8000
+KRNMAP   equ  0xC0000000
+
+section .multiboot.data
 align 8
 mb_start:
 dd MAGIC
-dd 0
+dd FLAGS
 dd LENGTH
 dd CHECKSUM
 dw 0
@@ -31,12 +37,6 @@ dw 0
 dd 8
 mb_end:
  
-section .bss
-align 16
-stack_end:
-resb 16384
-stack_top:
- 
 section .rodata
 align 16
 gdt_start:
@@ -48,16 +48,77 @@ gdt_descriptor:
 	dw gdt_end - gdt_start - 1
 	dd gdt_start
 
-section .text
+section .bootstrap_stack
+align 16
+stack_start:
+resb 16384 ; 16 KiB
+stack_end:
+
+section .bss
+align 4096
+page_directory:
+resb 4096
+page_table1:
+resb 4096
+
+section .multiboot.text
 align 8
 start:
+
+    ; push ebx
+    ; call kernel_boot
+    ; pop eax
+
+    mov edi, page_table1 - KRNMAP
+    mov esi, 0
+    mov ecx, 1023
+
+paging_cmp:
+    cmp esi, kernel_start
+    jl paging_add
+    cmp esi, kernel_end - KRNMAP
+    jge paging_map
+
+    mov edx, esi
+    or edx, 0x003
+    mov [edi], edx
+
+paging_add:
+    add esi, 4096
+    add edi, 4
+    loop paging_cmp
+
+paging_map:
+    mov dword [page_table1 - KRNMAP + 1023 * 4], VGABUF | 0x003
+    mov dword [page_directory - KRNMAP + 0], page_table1 - KRNMAP + 0x003
+    mov dword [page_directory - KRNMAP + 768 * 4], page_table1 - KRNMAP + 0x003 
+
+    mov ecx, page_directory - KRNMAP
+    mov cr3, ecx
+
+    mov ecx, cr0
+    or ecx, 0x80010000
+    mov cr0, ecx
+
+    lea ecx, load_gdt
+    jmp near ecx
+
+section .text
+align 8
+load_gdt:
 	cli
 	lgdt [gdt_descriptor]
     mov eax, cr0
     or al, 1
     mov cr0, eax
-	jmp 0x08:after_lgdt
+	jmp 0x08:load_kernel
-after_lgdt:
+
+load_kernel:
+
+    mov dword [page_directory], 0
+    mov ecx, cr3
+    mov cr3, ecx
+
 	mov ax, 0x10
 	mov ds, ax
 	mov ss, ax
@@ -67,7 +128,6 @@ after_lgdt:
 	mov esp, stack_end
 	mov ebp, stack_end
 	sti
-	push ebx
 	call kernel_main
 	cli
 halt:

kernel/src/tty/term.c

@@ -28,7 +28,7 @@ static void term_clear_line(int y) {
 void term_init (void) {
     x = 0;
     y = 0;
-    front = (uint16_t*) 0xb8000;
+    front = (uint16_t*) 0xC03FF000;
     term_setfg(VGA_WHITE);
     term_setbg(VGA_BLACK);
     term_clear();