Rearrange memory bootstrapping code.

Move EFI-related code and initial memory manager bootstrap code
to memory_bootstrap.cpp, move memory page structs to their own
memory_page.h/cpp files.

src/kernel/memory_pages.cpp

@@ -0,0 +1,74 @@
+#include "console.h"
+#include "memory_pages.h"
+
+page_block *
+page_block::list_consolidate()
+{
+	page_block *cur = this;
+	page_block *freed_head = nullptr, **freed = &freed_head;
+
+	while (cur) {
+		page_block *next = cur->next;
+
+		if (next && cur->flags == next->flags &&
+			cur->end() == next->physical_address)
+		{
+			cur->count += next->count;
+			cur->next = next->next;
+
+			next->next = 0;
+			*freed = next;
+			freed = &next->next;
+			continue;
+		}
+
+		cur = next;
+	}
+
+	return freed_head;
+}
+
+void
+page_block::list_dump(const char *name)
+{
+	console *cons = console::get();
+	cons->puts("Block list");
+	if (name) {
+		cons->puts(" ");
+		cons->puts(name);
+	}
+	cons->puts(":\n");
+
+	int count = 0;
+	for (page_block *cur = this; cur; cur = cur->next) {
+		cons->puts("  ");
+		cons->put_hex(cur->physical_address);
+		cons->puts(" ");
+		cons->put_hex((uint32_t)cur->flags);
+		if (cur->virtual_address) {
+			cons->puts(" ");
+			cons->put_hex(cur->virtual_address);
+		}
+		cons->puts(" [");
+		cons->put_dec(cur->count);
+		cons->puts("]\n");
+
+		count += 1;
+	}
+
+	cons->puts("  Total: ");
+	cons->put_dec(count);
+	cons->puts("\n");
+}
+
+void
+page_table_indices::dump()
+{
+	console *cons = console::get();
+	cons->puts("{");
+	for (int i = 0; i < 4; ++i) {
+		if (i) cons->puts(", ");
+		cons->put_dec(index[i]);
+	}
+	cons->puts("}");
+}