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memory.c
144 lines (130 loc) · 2.94 KB
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memory.c
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#include "bootpack.h"
unsigned int memtest(unsigned int start, unsigned int end)
{
char flg486 = 0;
unsigned int eflg, cr0, i;
eflg = io_load_eflags();
eflg |= EFLAGS_AC_BIT; /* AC-bit = 1 */
io_store_eflags(eflg);
eflg = io_load_eflags();
if ((eflg & EFLAGS_AC_BIT) != 0) {
flg486 = 1;
}
eflg &= ~EFLAGS_AC_BIT; /* AC-bit = 0 */
io_store_eflags(eflg);
if (flg486 != 0) {
cr0 = load_cr0();
cr0 |= CR0_CACHE_DISABLE;
store_cr0(cr0);
}
i = memtest_sub(start, end);
if (flg486 != 0) {
cr0 = load_cr0();
cr0 &= ~CR0_CACHE_DISABLE;
store_cr0(cr0);
}
return i;
}
void memman_init(struct MEMMAN *memman)
{
memman->frees = 0;
memman->maxfrees = 0;
memman->lostsize = 0;
memman->losts = 0;
return;
}
unsigned int memman_total(struct MEMMAN *memman)
{
int total, i;
total = 0;
for (i = 0; i < memman->frees; i++)
{
total += memman->free[i].size;
}
return total;
}
unsigned int memman_alloc(struct MEMMAN *memman, unsigned int size)
{
int addr, i;
for (i = 0; i < memman->frees; i++)
{
if (memman->free[i].size >= size)
{
addr = memman->free[i].addr;
memman->free[i].addr += size;
memman->free[i].size -= size;
if (memman->free[i].size == 0)
{
memman->frees--;
for (;i < memman->frees; i++)
{
memman->free[i] = memman->free[i+1];
}
}
return addr;
}
}
return 0;
}
unsigned int memman_alloc_4k(struct MEMMAN *memman, unsigned int size)
{
int a;
size = (size + 0xfff) & 0xfffff000;
a = memman_alloc(memman, size);
return a;
}
int memman_free_4k(struct MEMMAN *memman, unsigned int addr, unsigned int size)
{
int i;
size = (size + 0xfff) && 0xfffff000;
i = memman_free(memman, addr, size);
return i;
}
int memman_free(struct MEMMAN *man, unsigned int addr, unsigned int size)
{
int i, j;
for (i = 0; i < man->frees; i++) {
if (man->free[i].addr > addr) {
break;
}
}
/* free[i - 1].addr < addr < free[i].addr */
if (i > 0) {
if (man->free[i - 1].addr + man->free[i - 1].size == addr) {
man->free[i - 1].size += size;
if (i < man->frees) {
if (addr + size == man->free[i].addr) {
man->free[i - 1].size += man->free[i].size;
man->frees--;
for (; i < man->frees; i++) {
man->free[i] = man->free[i + 1];
}
}
}
return 0;
}
}
if (i < man->frees) {
if (addr + size == man->free[i].addr) {
man->free[i].addr = addr;
man->free[i].size += size;
return 0;
}
}
if (man->frees < MEMMAN_FREES) {
for (j = man->frees; j > i; j--) {
man->free[j] = man->free[j - 1];
}
man->frees++;
if (man->maxfrees < man->frees) {
man->maxfrees = man->frees;
}
man->free[i].addr = addr;
man->free[i].size = size;
return 0;
}
man->losts++;
man->lostsize += size;
return -1;
}
// vim:ts=4 shiftwidth=4