funnyos/kern/kern_mem.c - diff

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version 1.1.1.1, 2007/10/16 09:41:04

version 1.5, 2007/10/16 13:47:39

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#include <sys/mem.h>

#include <libkern/printf.h>

#define KMEM_DEBUG

/* #define KMEM_DEBUG */

#ifdef KMEM_DEBUG

#define DPRINTF(x...) do { printf(x); } while (0)

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/* calculate pointer to this (last) page */

lastpageptr = (uint32_t *)((allocbase + (8 * nmbmbytes * KMEM_PAGESIZE)) + (KMEM_PAGESIZE * nmbmbits));

DPRINTF("lastpageptr=0x%x\n", lastpageptr);

/* rewind pointer to the first byte */

firstpageptr = lastpageptr - ((npages - 1));

DPRINTF("firstpageptr=0x%x\n", firstpageptr);

offbits = mask ? mask - 1 : mask; /* XXX */

offbits = nmbmbits;

/* fill this (npages pages) region with zeroes */

while(firstpageptr <= lastpageptr) {

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/* zerofy page */

for (i = 0; i < KMEM_PAGESIZE; i++) {

*(uint8_t *)firstpageptr = 0xaa;

*(uint8_t *)firstpageptr = KMEM_FILLBYTE;

((uint8_t *)firstpageptr)++;

}

/* TODO rework offbits calculation */

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firstpageptr = lastpageptr - ((npages - 1));

/* got it */

DPRINTF("allocated, addr=0x%x\n", firstpageptr);

DPRINTF("allocated, addr=0x%x len=0x%x [0x%x-0x%x]\n", firstpageptr, npages * KMEM_PAGESIZE, firstpageptr, lastpageptr);

/* decrement system free pages */

freepages -= npages;