matos/core/mem.c

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2018-08-06 18:41:45 +02:00
#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;
}