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/* Needed so the AMD K8 runs correctly. */
#include <console/console.h>
#include <mem.h>
#include <cpu/p6/msr.h>
#include <cpu/k8/mtrr.h>
#include <device/device.h>
void k8_cpufixup(struct mem_range *mem)
{
unsigned long mmio_basek, tomk;
unsigned long i;
msr_t msr;
/* Except for the PCI MMIO hold just before 4GB there are no
* significant holes in the address space, so just account
* for those two and move on.
*/
mmio_basek = tomk = 0;
for(i = 0; mem[i].sizek; i++) {
unsigned long topk;
topk = mem[i].basek + mem[i].sizek;
if (tomk < topk) {
tomk = topk;
}
if ((topk < 4*1024*1024) && (mmio_basek < topk)) {
mmio_basek = topk;
}
}
if (mmio_basek > tomk) {
mmio_basek = tomk;
}
/* Setup TOP_MEM */
msr.hi = mmio_basek >> 22;
msr.lo = mmio_basek << 10;
wrmsr(TOP_MEM, msr);
/* Setup TOP_MEM2 */
msr.hi = tomk >> 22;
msr.lo = tomk << 12;
wrmsr(TOP_MEM2, msr);
/* zero the IORR's before we enable to prevent
* undefined side effects.
*/
msr.lo = msr.hi = 0;
for(i = IORR_FIRST; i <= IORR_LAST; i++) {
wrmsr(i, msr);
}
msr = rdmsr(SYSCFG);
msr.lo |= SYSCFG_MSR_MtrrVarDramEn | SYSCFG_MSR_TOM2En;
wrmsr(SYSCFG, msr);
}
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