struct tte *
tsb_tte_lookup(pmap_t pm, vm_offset_t va)
{
struct tte *bucket;
struct tte *tp;
u_long sz;
u_int i;
if (pm == kernel_pmap) {
PMAP_STATS_INC(tsb_nlookup_k);
tp = tsb_kvtotte(va);
if (tte_match(tp, va))
return (tp);
} else {
PMAP_LOCK_ASSERT(pm, MA_OWNED);
PMAP_STATS_INC(tsb_nlookup_u);
for (sz = TS_MIN; sz <= TS_MAX; sz++) {
bucket = tsb_vtobucket(pm, sz, va);
for (i = 0; i < TSB_BUCKET_SIZE; i++) {
tp = &bucket[i];
if (tte_match(tp, va))
return (tp);
}
}
}
return (NULL);
}
/*
* Create an environment for the EFI runtime code call. The most
* important part is creating the required 1:1 physical->virtual
* mappings for the runtime segments. To do that, we manually create
* page table which unmap userspace but gives correct kernel mapping.
* The 1:1 mappings for runtime segments usually occupy low 4G of the
* physical address map.
*
* The 1:1 mappings were chosen over the SetVirtualAddressMap() EFI RT
* service, because there are some BIOSes which fail to correctly
* relocate itself on the call, requiring both 1:1 and virtual
* mapping. As result, we must provide 1:1 mapping anyway, so no
* reason to bother with the virtual map, and no need to add a
* complexity into loader.
*
* The fpu_kern_enter() call allows firmware to use FPU, as mandated
* by the specification. In particular, CR0.TS bit is cleared. Also
* it enters critical section, giving us neccessary protection against
* context switch.
*
* There is no need to disable interrupts around the change of %cr3,
* the kernel mappings are correct, while we only grabbed the
* userspace portion of VA. Interrupts handlers must not access
* userspace. Having interrupts enabled fixes the issue with
* firmware/SMM long operation, which would negatively affect IPIs,
* esp. TLB shootdown requests.
*/
int
efi_arch_enter(void)
{
pmap_t curpmap;
curpmap = PCPU_GET(curpmap);
PMAP_LOCK_ASSERT(curpmap, MA_OWNED);
/*
* IPI TLB shootdown handler invltlb_pcid_handler() reloads
* %cr3 from the curpmap->pm_cr3, which would disable runtime
* segments mappings. Block the handler's action by setting
* curpmap to impossible value. See also comment in
* pmap.c:pmap_activate_sw().
*/
if (pmap_pcid_enabled && !invpcid_works)
PCPU_SET(curpmap, NULL);
load_cr3(VM_PAGE_TO_PHYS(efi_pml4_page) | (pmap_pcid_enabled ?
curpmap->pm_pcids[PCPU_GET(cpuid)].pm_pcid : 0));
/*
* If PCID is enabled, the clear CR3_PCID_SAVE bit in the loaded %cr3
* causes TLB invalidation.
*/
if (!pmap_pcid_enabled)
invltlb();
return (0);
}
struct tte *
tsb_tte_enter(pmap_t pm, vm_page_t m, vm_offset_t va, u_long sz, u_long data)
{
struct tte *bucket;
struct tte *rtp;
struct tte *tp;
vm_offset_t ova;
int b0;
int i;
if (DCACHE_COLOR(VM_PAGE_TO_PHYS(m)) != DCACHE_COLOR(va)) {
CTR5(KTR_SPARE2,
"tsb_tte_enter: off colour va=%#lx pa=%#lx o=%p ot=%d pi=%#lx",
va, VM_PAGE_TO_PHYS(m), m->object,
m->object ? m->object->type : -1,
m->pindex);
if (pm == kernel_pmap)
PMAP_STATS_INC(tsb_nenter_k_oc);
else
PMAP_STATS_INC(tsb_nenter_u_oc);
}
rw_assert(&tte_list_global_lock, RA_WLOCKED);
PMAP_LOCK_ASSERT(pm, MA_OWNED);
if (pm == kernel_pmap) {
PMAP_STATS_INC(tsb_nenter_k);
tp = tsb_kvtotte(va);
KASSERT((tp->tte_data & TD_V) == 0,
("tsb_tte_enter: replacing valid kernel mapping"));
goto enter;
}
PMAP_STATS_INC(tsb_nenter_u);
bucket = tsb_vtobucket(pm, sz, va);
tp = NULL;
rtp = NULL;
b0 = rd(tick) & (TSB_BUCKET_SIZE - 1);
i = b0;
do {
if ((bucket[i].tte_data & TD_V) == 0) {
tp = &bucket[i];
break;
}
if (tp == NULL) {
if ((bucket[i].tte_data & TD_REF) == 0)
tp = &bucket[i];
else if (rtp == NULL)
rtp = &bucket[i];
}
} while ((i = (i + 1) & (TSB_BUCKET_SIZE - 1)) != b0);
if (tp == NULL)
tp = rtp;
if ((tp->tte_data & TD_V) != 0) {
PMAP_STATS_INC(tsb_nrepl);
ova = TTE_GET_VA(tp);
pmap_remove_tte(pm, NULL, tp, ova);
tlb_page_demap(pm, ova);
}
enter:
if ((m->flags & PG_FICTITIOUS) == 0) {
data |= TD_CP;
if ((m->oflags & VPO_UNMANAGED) == 0) {
pm->pm_stats.resident_count++;
data |= TD_PV;
}
if (pmap_cache_enter(m, va) != 0)
data |= TD_CV;
TAILQ_INSERT_TAIL(&m->md.tte_list, tp, tte_link);
} else
data |= TD_FAKE | TD_E;
tp->tte_vpn = TV_VPN(va, sz);
tp->tte_data = data;
return (tp);
}
