kern: src/mem.c annotate

kern

forgot to add a shitload of files

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 26 Mar 2011 21:39:14 +0200
parents
children	8be069e6bb05

rev	line source
nuclear@17	1 #include <stdio.h>
nuclear@17	2 #include "mem.h"
nuclear@17	3 #include "panic.h"
nuclear@17	4 #include "vm.h"
nuclear@17	5
nuclear@17	6 /* end of kernel image */
nuclear@17	7 extern int _end;
nuclear@17	8
nuclear@17	9 static uint32_t brk;
nuclear@17	10
nuclear@17	11 void init_mem(struct mboot_info *mb)
nuclear@17	12 {
nuclear@17	13 /* start the physical allocated break at the end of
nuclear@17	14 * the kernel image
nuclear@17	15 */
nuclear@17	16 brk = (uint32_t)&_end;
nuclear@17	17 }
nuclear@17	18
nuclear@17	19 uint32_t alloc_phys_page(void)
nuclear@17	20 {
nuclear@17	21 uint32_t addr, dbg_prev_brk;
nuclear@17	22
nuclear@17	23 if(ADDR_TO_PGOFFS(brk)) {
nuclear@17	24 /* brk is not aligned, find the next page-aligned address */
nuclear@17	25 addr = (brk + PGSIZE) & ~PGOFFS_MASK;
nuclear@17	26 } else {
nuclear@17	27 /* brk is aligned, so we can use that address directly */
nuclear@17	28 addr = brk;
nuclear@17	29 }
nuclear@17	30
nuclear@17	31 if(addr >= MAX_BRK) {
nuclear@17	32 panic("alloc_phys_page() out of early alloc space");
nuclear@17	33 }
nuclear@17	34
nuclear@17	35 dbg_prev_brk = brk;
nuclear@17	36 brk = addr + PGSIZE; /* move the break to the end of the page */
nuclear@17	37
nuclear@17	38 printf("DBG: alloc_phys_page(): %x (brk %x -> %x)\n", addr, dbg_prev_brk, brk);
nuclear@17	39 return addr;
nuclear@17	40 }