#include "mem.h"
#include "vga.h"

struct mem_desc *page_desc = (struct mem_desc *)&__ld_kernel_end;

int memInit(unsigned long upper_mem)
{
	printString("Free Mem going from ");
	printInt((unsigned long)&__ld_kernel_end);
	printString(" to ");
	printInt(upper_mem * 1024);
	printString("\n");
	unsigned long memdesc_end =
	    (unsigned long)page_desc +
	    ((upper_mem) / (PAGE_SIZE / 1024)) * sizeof(struct mem_desc);
	uint lastUsed = (memdesc_end >> PAGE_SHIFT) + 1;
	for (uint i = 0; i < (upper_mem / (PAGE_SIZE / 1024)); i++) {
		struct mem_desc *mem = &page_desc[i];
		if (i < lastUsed)
			mem->ref = 1;
		else
			mem->ref = 0;
		mem->phy_addr = i * PAGE_SIZE;
	}
	return 0;
}