// could consider having an API to allow these to dynamically change
// MTRRs are for physical, static ranges. PAT are linear, more granular, and
// more dynamic
void setup_default_mtrrs(barrier_t* smp_barrier)
{
// disable interrupts
int8_t state = 0;
disable_irqsave(&state);
// barrier - if we're meant to do this for all cores, we'll be
// passed a pointer to an initialized barrier
if (smp_barrier)
waiton_barrier(smp_barrier);
// disable caching cr0: set CD and clear NW
lcr0((rcr0() | CR0_CD) & ~CR0_NW);
// flush caches
cache_flush();
// flush tlb
tlb_flush_global();
// disable MTRRs, and sets default type to WB (06)
#ifndef CONFIG_NOMTRRS
write_msr(IA32_MTRR_DEF_TYPE, 0x00000006);
// Now we can actually safely adjust the MTRRs
// MTRR for IO Holes (note these are 64 bit values we are writing)
// 0x000a0000 - 0x000c0000 : VGA - WC 0x01
write_msr(IA32_MTRR_PHYSBASE0, PTE_ADDR(VGAPHYSMEM) | 0x01);
// if we need to have a full 64bit val, use the UINT64 macro
write_msr(IA32_MTRR_PHYSMASK0, 0x0000000ffffe0800);
// 0x000c0000 - 0x00100000 : IO devices (and ROM BIOS) - UC 0x00
write_msr(IA32_MTRR_PHYSBASE1, PTE_ADDR(DEVPHYSMEM) | 0x00);
write_msr(IA32_MTRR_PHYSMASK1, 0x0000000ffffc0800);
// APIC/IOAPIC holes
/* Going to skip them, since we set their mode using PAT when we
* map them in
*/
// make sure all other MTRR ranges are disabled (should be unnecessary)
write_msr(IA32_MTRR_PHYSMASK2, 0);
write_msr(IA32_MTRR_PHYSMASK3, 0);
write_msr(IA32_MTRR_PHYSMASK4, 0);
write_msr(IA32_MTRR_PHYSMASK5, 0);
write_msr(IA32_MTRR_PHYSMASK6, 0);
write_msr(IA32_MTRR_PHYSMASK7, 0);
// keeps default type to WB (06), turns MTRRs on, and turns off fixed ranges
write_msr(IA32_MTRR_DEF_TYPE, 0x00000806);
#endif
// reflush caches and TLB
cache_flush();
tlb_flush_global();
// turn on caching
lcr0(rcr0() & ~(CR0_CD | CR0_NW));
// barrier
if (smp_barrier)
waiton_barrier(smp_barrier);
// enable interrupts
enable_irqsave(&state);
}
void pmap_pcid_configure(void) {
int ccpu = cpu_number();
uintptr_t cr4 = get_cr4();
boolean_t pcid_present = FALSE;
pmap_pcid_log("PCID configure invoked on CPU %d\n", ccpu);
pmap_assert(ml_get_interrupts_enabled() == FALSE || get_preemption_level() !=0);
pmap_assert(cpu_mode_is64bit());
if (PE_parse_boot_argn("-pmap_pcid_disable", &pmap_pcid_disabled, sizeof (pmap_pcid_disabled))) {
pmap_pcid_log("PMAP: PCID feature disabled\n");
printf("PMAP: PCID feature disabled, %u\n", pmap_pcid_disabled);
kprintf("PMAP: PCID feature disabled %u\n", pmap_pcid_disabled);
}
/* no_shared_cr3+PCID is currently unsupported */
#if DEBUG
if (pmap_pcid_disabled == FALSE)
no_shared_cr3 = FALSE;
else
no_shared_cr3 = TRUE;
#else
if (no_shared_cr3)
pmap_pcid_disabled = TRUE;
#endif
if (pmap_pcid_disabled || no_shared_cr3) {
unsigned i;
/* Reset PCID status, as we may have picked up
* strays if discovered prior to platform
* expert initialization.
*/
for (i = 0; i < real_ncpus; i++) {
if (cpu_datap(i)) {
cpu_datap(i)->cpu_pmap_pcid_enabled = FALSE;
}
pmap_pcid_ncpus = 0;
}
cpu_datap(ccpu)->cpu_pmap_pcid_enabled = FALSE;
return;
}
/* DRKTODO: assert if features haven't been discovered yet. Redundant
* invocation of cpu_mode_init and descendants masks this for now.
*/
if ((cpuid_features() & CPUID_FEATURE_PCID))
pcid_present = TRUE;
else {
cpu_datap(ccpu)->cpu_pmap_pcid_enabled = FALSE;
pmap_pcid_log("PMAP: PCID not detected CPU %d\n", ccpu);
return;
}
if ((cr4 & (CR4_PCIDE | CR4_PGE)) == (CR4_PCIDE|CR4_PGE)) {
cpu_datap(ccpu)->cpu_pmap_pcid_enabled = TRUE;
pmap_pcid_log("PMAP: PCID already enabled %d\n", ccpu);
return;
}
if (pcid_present == TRUE) {
pmap_pcid_log("Pre-PCID:CR0: 0x%lx, CR3: 0x%lx, CR4(CPU %d): 0x%lx\n", get_cr0(), get_cr3_raw(), ccpu, cr4);
if (cpu_number() >= PMAP_PCID_MAX_CPUS) {
panic("PMAP_PCID_MAX_CPUS %d\n", cpu_number());
}
if ((get_cr4() & CR4_PGE) == 0) {
set_cr4(get_cr4() | CR4_PGE);
pmap_pcid_log("Toggled PGE ON (CPU: %d\n", ccpu);
}
set_cr4(get_cr4() | CR4_PCIDE);
pmap_pcid_log("Post PCID: CR0: 0x%lx, CR3: 0x%lx, CR4(CPU %d): 0x%lx\n", get_cr0(), get_cr3_raw(), ccpu, get_cr4());
tlb_flush_global();
cpu_datap(ccpu)->cpu_pmap_pcid_enabled = TRUE;
if (OSIncrementAtomic(&pmap_pcid_ncpus) == machine_info.max_cpus) {
pmap_pcid_log("All PCIDs enabled: real_ncpus: %d, pmap_pcid_ncpus: %d\n", real_ncpus, pmap_pcid_ncpus);
}
cpu_datap(ccpu)->cpu_pmap_pcid_coherentp =
cpu_datap(ccpu)->cpu_pmap_pcid_coherentp_kernel =
&(kernel_pmap->pmap_pcid_coherency_vector[ccpu]);
cpu_datap(ccpu)->cpu_pcid_refcounts[0] = 1;
}
}