[main] Fix multiboot in some instances. Enabling paging can squash the multiboot header, so we want to back it up to somewhere safe.

core/array.h

@@ -0,0 +1,28 @@
+#ifndef ARRAY_H
+#define ARRAY_H
+#include <system.h>
+
+typedef void * type_t;
+typedef signed char (*lessthan_predicate_t)(type_t, type_t);
+typedef struct {
+	type_t *array;
+	uint32_t size;
+	uint32_t max_size;
+	lessthan_predicate_t less_than;
+} ordered_array_t;
+
+signed char standard_lessthan_predicate(type_t a, type_t b);
+
+ordered_array_t create_ordered_array(uint32_t max_size, lessthanpredicate_t less_than);
+ordered_array_t place_ordered_array(void *addr, uint32_t max_size, lessthan_predicate_t less_than);
+
+void destroy_ordered_array(ordered_array_t *array);
+
+void insert_ordered_array(type_t item, ordered_array_t *array);
+
+type_t loopup_ordered_array(uint32_t i, ordered_array_t *array);
+
+void remove_ordered_array(uint32_t i, ordered_array_t *array);
+
+
+#endif

core/mem.c

@@ -5,6 +5,17 @@
 
 #include <system.h>
 
+typedef struct {
+	uint32_t magic;
+	char     is_hole;
+	uint32_t size;
+} header_t;
+
+typedef struct {
+	uint32_t magic;
+	header_t * header;
+} footer_t;
+
 extern uintptr_t end;
 uintptr_t placement_pointer = &end;
 

core/vga.c

@@ -145,5 +145,6 @@ resettextcolor() {
  */
 void init_video() {
 	textmemptr = (unsigned short *)0xB8000;
-	cls();
+	csr_y = 10;
+	move_csr();
 }

main.c

@@ -97,48 +97,21 @@ outportb(
 	__asm__ __volatile__ ("outb %1, %0" : : "dN" (_port), "a" (_data));
 }
 
-/*
- * 99 Bottles of Beer on the -Wall
- * Sample kernel mode program.
- */
-void beer() {
-	int i = 99;
-	while (i > 0) {
-		if (i == 1) {
-			puts ("One bottle of beer on the wall, one bottle of beer. Take one down, pass it around, ");
-		} else {
-			kprintf("%d bottles of beer on the wall, %d bottles of beer...\n", i, i);
-		}
-		i--;
-		if (i == 1) {
-			puts("One bottle of beer on the wall.\n");
-		} else {
-			kprintf("%d bottles of beer on the wall.\n", i);
-		}
-		timer_wait(3);
-	}
-	puts("No more bottles of beer on the wall.\n");
+struct multiboot *
+copy_multiboot(
+		struct multiboot *mboot_ptr
+		) {
+	struct multiboot *new_header = (struct multiboot *)kmalloc(sizeof(struct multiboot));
+	memcpy(new_header, mboot_ptr, sizeof(struct multiboot));
+	return new_header;
 }
 
-/*
- * kernel entry point
- */
-int
-main(struct multiboot *mboot_ptr) {
-	gdt_install();
-	idt_install();
-	isrs_install();
-	irq_install();
-	init_video();
-	paging_install(mboot_ptr->mem_upper + 1024);
-	timer_install();
-	keyboard_install();
-	/* Yes, yes, these are #define'd strings, consider this a nice test of kprintf */
-	settextcolor(12,0);
-	kprintf("[%s %s]\n", KERNEL_UNAME, KERNEL_VERSION_STRING);
-	settextcolor(1,0);
-	/* Multiboot Debug */
-	kprintf("Received the following MULTIBOOT data:\n");
+void
+dump_multiboot(
+		struct multiboot *mboot_ptr
+		) {
+	resettextcolor();
+	kprintf("MULTIBOOT header at 0x%x:\n", (uintptr_t)mboot_ptr);
 	settextcolor(7,0);
 	kprintf("Flags : 0x%x ",  mboot_ptr->flags);
 	kprintf("Mem Lo: 0x%x ",  mboot_ptr->mem_lower);
@@ -165,40 +138,33 @@ main(struct multiboot *mboot_ptr) {
 	kprintf("VBE of: 0x%x ",  mboot_ptr->vbe_interface_off);
 	kprintf("VBE le: 0x%x\n", mboot_ptr->vbe_interface_len);
 	resettextcolor();
-	kprintf("(End multiboot raw data)\n");
 	kprintf("Started with: %s\n", (char *)mboot_ptr->cmdline);
 	kprintf("Booted from: %s\n", (char *)mboot_ptr->boot_loader_name);
-	
 	kprintf("%dkB lower memory\n", mboot_ptr->mem_lower);
 	kprintf("%dkB higher memory ", mboot_ptr->mem_upper);
 	int mem_mb = mboot_ptr->mem_upper / 1024;
 	kprintf("(%dMB)\n", mem_mb);
-	
-
-	settextcolor(7,0);
-	kprintf("Testing colors...\n");
-	resettextcolor();
-	int i;
-	for (i = 0; i < 16; ++i) {
-		settextcolor(i,i);
-		putch(' ');
 }
-	putch('\n');
+
+/*
+ * kernel entry point
+ */
+int
+main(struct multiboot *mboot_ptr) {
+	mboot_ptr = copy_multiboot(mboot_ptr);
+	gdt_install();
+	idt_install();
+	isrs_install();
+	irq_install();
+	init_video();
+	settextcolor(12,0);
+	kprintf("[%s %s]\n", KERNEL_UNAME, KERNEL_VERSION_STRING);
+	paging_install(mboot_ptr->mem_upper);
+	dump_multiboot(mboot_ptr);
+	timer_install();
+	keyboard_install();
+	/* Yes, yes, these are #define'd strings, consider this a nice test of kprintf */
 	resettextcolor();
 
-	settextcolor(9,0);
-	kprintf(" = Roadmap = \n");
-	kprintf("- Paging\n");
-	kprintf("- Heap\n");
-	kprintf("- VFS\n");
-	kprintf("- Initial ramdisk\n");
-	kprintf("- Task switching\n");
-	kprintf("- User mode execution\n");
-	kprintf("- EXT2\n");
-	resettextcolor();
-
-	kprintf("Kernel is finished booting. Press `q` to produce a page fault.\n");
-
-	//for (;;);
 	return 0;
 }