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#include <console/console.h>
#include <device/device.h>
#include <cpu/x86/mtrr.h>
#include <cpu/amd/mtrr.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/msr.h>
static unsigned long resk(uint64_t value)
{
unsigned long resultk;
if (value < (1ULL << 42)) {
resultk = value >> 10;
}
else {
resultk = 0xffffffff;
}
return resultk;
}
static unsigned fixed_mtrr_index(unsigned long addrk)
{
unsigned index;
index = (addrk - 0) >> 6;
if (index >= 8) {
index = ((addrk - 8*64) >> 4) + 8;
}
if (index >= 24) {
index = ((addrk - (8*64 + 16*16)) >> 2) + 24;
}
if (index > NUM_FIXED_RANGES) {
index = NUM_FIXED_RANGES;
}
return index;
}
static unsigned int mtrr_msr[] = {
MTRRfix64K_00000_MSR, MTRRfix16K_80000_MSR, MTRRfix16K_A0000_MSR,
MTRRfix4K_C0000_MSR, MTRRfix4K_C8000_MSR, MTRRfix4K_D0000_MSR, MTRRfix4K_D8000_MSR,
MTRRfix4K_E0000_MSR, MTRRfix4K_E8000_MSR, MTRRfix4K_F0000_MSR, MTRRfix4K_F8000_MSR,
};
static void set_fixed_mtrrs(unsigned int first, unsigned int last, unsigned char type)
{
unsigned int i;
unsigned int fixed_msr = NUM_FIXED_RANGES >> 3;
msr_t msr;
msr.lo = msr.hi = 0; /* Shut up gcc */
for (i = first; i < last; i++) {
/* When I switch to a new msr read it in */
if (fixed_msr != i >> 3) {
/* But first write out the old msr */
if (fixed_msr < (NUM_FIXED_RANGES >> 3)) {
disable_cache();
wrmsr(mtrr_msr[fixed_msr], msr);
enable_cache();
}
fixed_msr = i>>3;
msr = rdmsr(mtrr_msr[fixed_msr]);
}
if ((i & 7) < 4) {
msr.lo &= ~(0xff << ((i&3)*8));
msr.lo |= type << ((i&3)*8);
} else {
msr.hi &= ~(0xff << ((i&3)*8));
msr.hi |= type << ((i&3)*8);
}
}
/* Write out the final msr */
if (fixed_msr < (NUM_FIXED_RANGES >> 3)) {
disable_cache();
wrmsr(mtrr_msr[fixed_msr], msr);
enable_cache();
}
}
struct mem_state {
unsigned long mmio_basek, tomk;
};
static void set_fixed_mtrr_resource(void *gp, struct device *dev, struct resource *res)
{
struct mem_state *state = gp;
unsigned long topk;
unsigned int start_mtrr;
unsigned int last_mtrr;
topk = resk(res->base + res->size);
if (state->tomk < topk) {
state->tomk = topk;
}
if ((topk < 4*1024*1024) && (state->mmio_basek < topk)) {
state->mmio_basek = topk;
}
start_mtrr = fixed_mtrr_index(resk(res->base));
last_mtrr = fixed_mtrr_index(resk((res->base + res->size)));
if (start_mtrr >= NUM_FIXED_RANGES) {
return;
}
printk(BIOS_DEBUG, "Setting fixed MTRRs(%d-%d) Type: WB, RdMEM, WrMEM\n",
start_mtrr, last_mtrr);
set_fixed_mtrrs(start_mtrr, last_mtrr, MTRR_TYPE_WRBACK | MTRR_READ_MEM | MTRR_WRITE_MEM);
}
void amd_setup_mtrrs(void)
{
unsigned long address_bits;
struct mem_state state;
unsigned long i;
msr_t msr;
/* Enable the access to AMD RdDram and WrDram extension bits */
disable_cache();
msr = rdmsr(SYSCFG_MSR);
msr.lo |= SYSCFG_MSR_MtrrFixDramModEn;
wrmsr(SYSCFG_MSR, msr);
enable_cache();
printk(BIOS_DEBUG, "\n");
/* Initialized the fixed_mtrrs to uncached */
printk(BIOS_DEBUG, "Setting fixed MTRRs(%d-%d) type: UC\n",
0, NUM_FIXED_RANGES);
set_fixed_mtrrs(0, NUM_FIXED_RANGES, MTRR_TYPE_UNCACHEABLE);
/* Except for the PCI MMIO hole just before 4GB there are no
* significant holes in the address space, so just account
* for those two and move on.
*/
state.mmio_basek = state.tomk = 0;
search_global_resources(
IORESOURCE_MEM | IORESOURCE_CACHEABLE, IORESOURCE_MEM | IORESOURCE_CACHEABLE,
set_fixed_mtrr_resource, &state);
printk(BIOS_DEBUG, "DONE fixed MTRRs\n");
if (state.mmio_basek > state.tomk) {
state.mmio_basek = state.tomk;
}
/* Round state.mmio_basek down to the nearst size that will fit in TOP_MEM */
state.mmio_basek = state.mmio_basek & ~TOP_MEM_MASK_KB;
/* Round state.tomk up to the next greater size that will fit in TOP_MEM */
state.tomk = (state.tomk + TOP_MEM_MASK_KB) & ~TOP_MEM_MASK_KB;
disable_cache();
/* Setup TOP_MEM */
msr.hi = state.mmio_basek >> 22;
msr.lo = state.mmio_basek << 10;
wrmsr(TOP_MEM, msr);
if(state.tomk > (4*1024*1024)) {
/* Setup TOP_MEM2 */
msr.hi = state.tomk >> 22;
msr.lo = state.tomk << 10;
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);
}
/* Enable Variable Mtrrs
* Enable the RdMem and WrMem bits in the fixed mtrrs.
* Disable access to the RdMem and WrMem in the fixed mtrr.
*/
msr = rdmsr(SYSCFG_MSR);
msr.lo |= SYSCFG_MSR_MtrrVarDramEn | SYSCFG_MSR_MtrrFixDramEn | SYSCFG_MSR_TOM2En;
msr.lo &= ~SYSCFG_MSR_MtrrFixDramModEn;
wrmsr(SYSCFG_MSR, msr);
enable_fixed_mtrr();
enable_cache();
/* FIXME we should probably query the cpu for this
* but so far this is all any recent AMD cpu has supported.
*/
address_bits = CONFIG_CPU_ADDR_BITS; //K8 could be 40, and GH could be 48
/* Now that I have mapped what is memory and what is not
* Setup the mtrrs so we can cache the memory.
*/
x86_setup_var_mtrrs(address_bits);
}
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