/*
* Copyright (c) 2006 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup ia64mm
* @{
*/
/** @file
*/
/*
* TLB management.
*/
#include <mm/tlb.h>
#include <mm/asid.h>
#include <mm/page.h>
#include <mm/as.h>
#include <arch/mm/tlb.h>
#include <arch/mm/page.h>
#include <arch/mm/vhpt.h>
#include <arch/barrier.h>
#include <arch/interrupt.h>
#include <arch/pal/pal.h>
#include <arch/asm.h>
#include <panic.h>
#include <print.h>
#include <arch.h>
#include <interrupt.h>
/** Invalidate all TLB entries. */
void tlb_invalidate_all(void)
{
ipl_t ipl;
uintptr_t adr;
uint32_t count1, count2, stride1, stride2;
unsigned int i, j;
adr = PAL_PTCE_INFO_BASE();
count1 = PAL_PTCE_INFO_COUNT1();
count2 = PAL_PTCE_INFO_COUNT2();
stride1 = PAL_PTCE_INFO_STRIDE1();
stride2 = PAL_PTCE_INFO_STRIDE2();
ipl = interrupts_disable();
for (i = 0; i < count1; i++) {
for (j = 0; j < count2; j++) {
asm volatile (
"ptc.e %0 ;;"
:
: "r" (adr)
);
adr += stride2;
}
adr += stride1;
}
interrupts_restore(ipl);
srlz_d();
srlz_i();
#ifdef CONFIG_VHPT
vhpt_invalidate_all();
#endif
}
/** Invalidate entries belonging to an address space.
*
* @param asid Address space identifier.
*/
void tlb_invalidate_asid(asid_t asid)
{
tlb_invalidate_all();
}
void tlb_invalidate_pages(asid_t asid, uintptr_t page, count_t cnt)
{
region_register rr;
bool restore_rr = false;
int b = 0;
int c = cnt;
uintptr_t va;
va = page;
rr.word = rr_read(VA2VRN(va));
if ((restore_rr = (rr.map.rid != ASID2RID(asid, VA2VRN(va))))) {
/*
* The selected region register does not contain required RID.
* Save the old content of the register and replace the RID.
*/
region_register rr0;
rr0 = rr;
rr0.map.rid = ASID2RID(asid, VA2VRN(va));
rr_write(VA2VRN(va), rr0.word);
srlz_d();
srlz_i();
}
while(c >>= 1)
b++;
b >>= 1;
uint64_t ps;
switch (b) {
case 0: /* cnt 1 - 3 */
ps = PAGE_WIDTH;
break;
case 1: /* cnt 4 - 15 */
ps = PAGE_WIDTH + 2;
va &= ~((1 << ps) - 1);
break;
case 2: /* cnt 16 - 63 */
ps = PAGE_WIDTH + 4;
va &= ~((1 << ps) - 1);
break;
case 3: /* cnt 64 - 255 */
ps = PAGE_WIDTH + 6;
va &= ~((1 << ps) - 1);
break;
case 4: /* cnt 256 - 1023 */
ps = PAGE_WIDTH + 8;
va &= ~((1 << ps) - 1);
break;
case 5: /* cnt 1024 - 4095 */
ps = PAGE_WIDTH + 10;
va &= ~((1 << ps) - 1);
break;
case 6: /* cnt 4096 - 16383 */
ps = PAGE_WIDTH + 12;
va &= ~((1 << ps) - 1);
break;
case 7: /* cnt 16384 - 65535 */
case 8: /* cnt 65536 - (256K - 1) */
ps = PAGE_WIDTH + 14;
va &= ~((1 << ps) - 1);
break;
default:
ps = PAGE_WIDTH + 18;
va &= ~((1 << ps) - 1);
break;
}
for(; va < (page + cnt * PAGE_SIZE); va += (1 << ps))
asm volatile ("ptc.l %0, %1;;" :: "r" (va), "r" (ps << 2));
srlz_d();
srlz_i();
if (restore_rr) {
rr_write(VA2VRN(va), rr.word);
srlz_d();
srlz_i();
}
}
/** Insert data into data translation cache.
*
* @param va Virtual page address.
* @param asid Address space identifier.
* @param entry The rest of TLB entry as required by TLB insertion
* format.
*/
void dtc_mapping_insert(uintptr_t va, asid_t asid, tlb_entry_t entry)
{
tc_mapping_insert(va, asid, entry, true);
}
/** Insert data into instruction translation cache.
*
* @param va Virtual page address.
* @param asid Address space identifier.
* @param entry The rest of TLB entry as required by TLB insertion
* format.
*/
void itc_mapping_insert(uintptr_t va, asid_t asid, tlb_entry_t entry)
{
tc_mapping_insert(va, asid, entry, false);
}
/** Insert data into instruction or data translation cache.
*
* @param va Virtual page address.
* @param asid Address space identifier.
* @param entry The rest of TLB entry as required by TLB insertion
* format.
* @param dtc If true, insert into data translation cache, use
* instruction translation cache otherwise.
*/
void tc_mapping_insert(uintptr_t va, asid_t asid, tlb_entry_t entry, bool dtc)
{
region_register rr;
bool restore_rr = false;
rr.word = rr_read(VA2VRN(va));
if ((restore_rr = (rr.map.rid != ASID2RID(asid, VA2VRN(va))))) {
/*
* The selected region register does not contain required RID.
* Save the old content of the register and replace the RID.
*/
region_register rr0;
rr0 = rr;
rr0.map.rid = ASID2RID(asid, VA2VRN(va));
rr_write(VA2VRN(va), rr0.word);
srlz_d();
srlz_i();
}
asm volatile (
"mov r8 = psr;;\n"
"rsm %0;;\n" /* PSR_IC_MASK */
"srlz.d;;\n"
"srlz.i;;\n"
"mov cr.ifa = %1\n" /* va */
"mov cr.itir = %2;;\n" /* entry.word[1] */
"cmp.eq p6,p7 = %4,r0;;\n" /* decide between itc and dtc */
"(p6) itc.i %3;;\n"
"(p7) itc.d %3;;\n"
"mov psr.l = r8;;\n"
"srlz.d;;\n"
:
: "i" (PSR_IC_MASK), "r" (va), "r" (entry.word[1]),
"r" (entry.word[0]), "r" (dtc)
: "p6", "p7", "r8"
);
if (restore_rr) {
rr_write(VA2VRN(va), rr.word);
srlz_d();
srlz_i();
}
}
/** Insert data into instruction translation register.
*
* @param va Virtual page address.
* @param asid Address space identifier.
* @param entry The rest of TLB entry as required by TLB insertion
* format.
* @param tr Translation register.
*/
void
itr_mapping_insert(uintptr_t va, asid_t asid, tlb_entry_t entry, index_t tr)
{
tr_mapping_insert(va, asid, entry, false, tr);
}
/** Insert data into data translation register.
*
* @param va Virtual page address.
* @param asid Address space identifier.
* @param entry The rest of TLB entry as required by TLB insertion
* format.
* @param tr Translation register.
*/
void
dtr_mapping_insert(uintptr_t va, asid_t asid, tlb_entry_t entry, index_t tr)
{
tr_mapping_insert(va, asid, entry, true, tr);
}
/** Insert data into instruction or data translation register.
*
* @param va Virtual page address.
* @param asid Address space identifier.
* @param entry The rest of TLB entry as required by TLB insertion
* format.
* @param dtr If true, insert into data translation register, use
* instruction translation register otherwise.
* @param tr Translation register.
*/
void
tr_mapping_insert(uintptr_t va, asid_t asid, tlb_entry_t entry, bool dtr,
index_t tr)
{
region_register rr;
bool restore_rr = false;
rr.word = rr_read(VA2VRN(va));
if ((restore_rr = (rr.map.rid != ASID2RID(asid, VA2VRN(va))))) {
/*
* The selected region register does not contain required RID.
* Save the old content of the register and replace the RID.
*/
region_register rr0;
rr0 = rr;
rr0.map.rid = ASID2RID(asid, VA2VRN(va));
rr_write(VA2VRN(va), rr0.word);
srlz_d();
srlz_i();
}
asm volatile (
"mov r8 = psr;;\n"
"rsm %0;;\n" /* PSR_IC_MASK */
"srlz.d;;\n"
"srlz.i;;\n"
"mov cr.ifa = %1\n" /* va */
"mov cr.itir = %2;;\n" /* entry.word[1] */
"cmp.eq p6,p7 = %5,r0;;\n" /* decide between itr and dtr */
"(p6) itr.i itr[%4] = %3;;\n"
"(p7) itr.d dtr[%4] = %3;;\n"
"mov psr.l = r8;;\n"
"srlz.d;;\n"
:
: "i" (PSR_IC_MASK), "r" (va), "r" (entry.word[1]),
"r" (entry.word[0]), "r" (tr), "r" (dtr)
: "p6", "p7", "r8"
);
if (restore_rr) {
rr_write(VA2VRN(va), rr.word);
srlz_d();
srlz_i();
}
}
/** Insert data into DTLB.
*
* @param page Virtual page address including VRN bits.
* @param frame Physical frame address.
* @param dtr If true, insert into data translation register, use data
* translation cache otherwise.
* @param tr Translation register if dtr is true, ignored otherwise.
*/
void
dtlb_kernel_mapping_insert(uintptr_t page, uintptr_t frame, bool dtr,
index_t tr)
{
tlb_entry_t entry;
entry.word[0] = 0;
entry.word[1] = 0;
entry.p = true; /* present */
entry.ma = MA_WRITEBACK;
entry.a = true; /* already accessed */
entry.d = true; /* already dirty */
entry.pl = PL_KERNEL;
entry.ar = AR_READ | AR_WRITE;
entry.ppn = frame >> PPN_SHIFT;
entry.ps = PAGE_WIDTH;
if (dtr)
dtr_mapping_insert(page, ASID_KERNEL, entry, tr);
else
dtc_mapping_insert(page, ASID_KERNEL, entry);
}
/** Purge kernel entries from DTR.
*
* Purge DTR entries used by the kernel.
*
* @param page Virtual page address including VRN bits.
* @param width Width of the purge in bits.
*/
void dtr_purge(uintptr_t page, count_t width)
{
asm volatile ("ptr.d %0, %1\n" : : "r" (page), "r" (width << 2));
}
/** Copy content of PTE into data translation cache.
*
* @param t PTE.
*/
void dtc_pte_copy(pte_t *t)
{
tlb_entry_t entry;
entry.word[0] = 0;
entry.word[1] = 0;
entry.p = t->p;
entry.ma = t->c ? MA_WRITEBACK : MA_UNCACHEABLE;
entry.a = t->a;
entry.d = t->d;
entry.pl = t->k ? PL_KERNEL : PL_USER;
entry.ar = t->w ? AR_WRITE : AR_READ;
entry.ppn = t->frame >> PPN_SHIFT;
entry.ps = PAGE_WIDTH;
dtc_mapping_insert(t->page, t->as->asid, entry);
#ifdef CONFIG_VHPT
vhpt_mapping_insert(t->page, t->as->asid, entry);
#endif
}
/** Copy content of PTE into instruction translation cache.
*
* @param t PTE.
*/
void itc_pte_copy(pte_t *t)
{
tlb_entry_t entry;
entry.word[0] = 0;
entry.word[1] = 0;
ASSERT(t->x);
entry.p = t->p;
entry.ma = t->c ? MA_WRITEBACK : MA_UNCACHEABLE;
entry.a = t->a;
entry.pl = t->k ? PL_KERNEL : PL_USER;
entry.ar = t->x ? (AR_EXECUTE | AR_READ) : AR_READ;
entry.ppn = t->frame >> PPN_SHIFT;
entry.ps = PAGE_WIDTH;
itc_mapping_insert(t->page, t->as->asid, entry);
#ifdef CONFIG_VHPT
vhpt_mapping_insert(t->page, t->as->asid, entry);
#endif
}
/** Instruction TLB fault handler for faults with VHPT turned off.
*
* @param vector Interruption vector.
* @param istate Structure with saved interruption state.
*/
void alternate_instruction_tlb_fault(uint64_t vector, istate_t *istate)
{
region_register rr;
rid_t rid;
uintptr_t va;
pte_t *t;
va = istate->cr_ifa; /* faulting address */
rr.word = rr_read(VA2VRN(va));
rid = rr.map.rid;
page_table_lock(AS, true);
t = page_mapping_find(AS, va);
if (t) {
/*
* The mapping was found in software page hash table.
* Insert it into data translation cache.
*/
itc_pte_copy(t);
page_table_unlock(AS, true);
} else {
/*
* Forward the page fault to address space page fault handler.
*/
page_table_unlock(AS, true);
if (as_page_fault(va, PF_ACCESS_EXEC, istate) == AS_PF_FAULT) {
fault_if_from_uspace(istate,"Page fault at %p",va);
panic("%s: va=%p, rid=%d, iip=%p\n", __func__, va, rid,
istate->cr_iip);
}
}
}
static int is_io_page_accessible(int page)
{
if (TASK->arch.iomap)
return bitmap_get(TASK->arch.iomap, page);
else
return 0;
}
#define IO_FRAME_BASE 0xFFFFC000000
/**
* There is special handling of memory mapped legacy io, because of 4KB sized
* access for userspace.
*
* @param va Virtual address of page fault.
* @param istate Structure with saved interruption state.
*
* @return One on success, zero on failure.
*/
static int try_memmap_io_insertion(uintptr_t va, istate_t *istate)
{
if ((va >= IO_OFFSET ) && (va < IO_OFFSET + (1 << IO_PAGE_WIDTH))) {
if (TASK) {
uint64_t io_page = (va & ((1 << IO_PAGE_WIDTH) - 1)) >>
USPACE_IO_PAGE_WIDTH;
if (is_io_page_accessible(io_page)) {
uint64_t page, frame;
page = IO_OFFSET +
(1 << USPACE_IO_PAGE_WIDTH) * io_page;
frame = IO_FRAME_BASE +
(1 << USPACE_IO_PAGE_WIDTH) * io_page;
tlb_entry_t entry;
entry.word[0] = 0;
entry.word[1] = 0;
entry.p = true; /* present */
entry.ma = MA_UNCACHEABLE;
entry.a = true; /* already accessed */
entry.d = true; /* already dirty */
entry.pl = PL_USER;
entry.ar = AR_READ | AR_WRITE;
entry.ppn = frame >> PPN_SHIFT;
entry.ps = USPACE_IO_PAGE_WIDTH;
dtc_mapping_insert(page, TASK->as->asid, entry);
return 1;
} else {
fault_if_from_uspace(istate,
"IO access fault at %p", va);
}
}
}
return 0;
}
/** Data TLB fault handler for faults with VHPT turned off.
*
* @param vector Interruption vector.
* @param istate Structure with saved interruption state.
*/
void alternate_data_tlb_fault(uint64_t vector, istate_t *istate)
{
region_register rr;
rid_t rid;
uintptr_t va;
pte_t *t;
va = istate->cr_ifa; /* faulting address */
rr.word = rr_read(VA2VRN(va));
rid = rr.map.rid;
if (RID2ASID(rid) == ASID_KERNEL) {
if (VA2VRN(va) == VRN_KERNEL) {
/*
* Provide KA2PA(identity) mapping for faulting piece of
* kernel address space.
*/
dtlb_kernel_mapping_insert(va, KA2PA(va), false, 0);
return;
}
}
page_table_lock(AS, true);
t = page_mapping_find(AS, va);
if (t) {
/*
* The mapping was found in the software page hash table.
* Insert it into data translation cache.
*/
dtc_pte_copy(t);
page_table_unlock(AS, true);
} else {
page_table_unlock(AS, true);
if (try_memmap_io_insertion(va, istate))
return;
/*
* Forward the page fault to the address space page fault
* handler.
*/
if (as_page_fault(va, PF_ACCESS_READ, istate) == AS_PF_FAULT) {
fault_if_from_uspace(istate,"Page fault at %p",va);
panic("%s: va=%p, rid=%d, iip=%p\n", __func__, va, rid,
istate->cr_iip);
}
}
}
/** Data nested TLB fault handler.
*
* This fault should not occur.
*
* @param vector Interruption vector.
* @param istate Structure with saved interruption state.
*/
void data_nested_tlb_fault(uint64_t vector, istate_t *istate)
{
panic("%s\n", __func__);
}
/** Data Dirty bit fault handler.
*
* @param vector Interruption vector.
* @param istate Structure with saved interruption state.
*/
void data_dirty_bit_fault(uint64_t vector, istate_t *istate)
{
region_register rr;
rid_t rid;
uintptr_t va;
pte_t *t;
va = istate->cr_ifa; /* faulting address */
rr.word = rr_read(VA2VRN(va));
rid = rr.map.rid;
page_table_lock(AS, true);
t = page_mapping_find(AS, va);
ASSERT(t && t->p);
if (t && t->p && t->w) {
/*
* Update the Dirty bit in page tables and reinsert
* the mapping into DTC.
*/
t->d = true;
dtc_pte_copy(t);
} else {
if (as_page_fault(va, PF_ACCESS_WRITE, istate) == AS_PF_FAULT) {
fault_if_from_uspace(istate,"Page fault at %p",va);
panic("%s: va=%p, rid=%d, iip=%p\n", __func__, va, rid,
istate->cr_iip);
}
}
page_table_unlock(AS, true);
}
/** Instruction access bit fault handler.
*
* @param vector Interruption vector.
* @param istate Structure with saved interruption state.
*/
void instruction_access_bit_fault(uint64_t vector, istate_t *istate)
{
region_register rr;
rid_t rid;
uintptr_t va;
pte_t *t;
va = istate->cr_ifa; /* faulting address */
rr.word = rr_read(VA2VRN(va));
rid = rr.map.rid;
page_table_lock(AS, true);
t = page_mapping_find(AS, va);
ASSERT(t && t->p);
if (t && t->p && t->x) {
/*
* Update the Accessed bit in page tables and reinsert
* the mapping into ITC.
*/
t->a = true;
itc_pte_copy(t);
} else {
if (as_page_fault(va, PF_ACCESS_EXEC, istate) == AS_PF_FAULT) {
fault_if_from_uspace(istate, "Page fault at %p", va);
panic("%s: va=%p, rid=%d, iip=%p\n", __func__, va, rid,
istate->cr_iip);
}
}
page_table_unlock(AS, true);
}
/** Data access bit fault handler.
*
* @param vector Interruption vector.
* @param istate Structure with saved interruption state.
*/
void data_access_bit_fault(uint64_t vector, istate_t *istate)
{
region_register rr;
rid_t rid;
uintptr_t va;
pte_t *t;
va = istate->cr_ifa; /* faulting address */
rr.word = rr_read(VA2VRN(va));
rid = rr.map.rid;
page_table_lock(AS, true);
t = page_mapping_find(AS, va);
ASSERT(t && t->p);
if (t && t->p) {
/*
* Update the Accessed bit in page tables and reinsert
* the mapping into DTC.
*/
t->a = true;
dtc_pte_copy(t);
} else {
if (as_page_fault(va, PF_ACCESS_READ, istate) == AS_PF_FAULT) {
fault_if_from_uspace(istate, "Page fault at %p", va);
panic("%s: va=%p, rid=%d, iip=%p\n", __func__, va, rid,
istate->cr_iip);
}
}
page_table_unlock(AS, true);
}
/** Page not present fault handler.
*
* @param vector Interruption vector.
* @param istate Structure with saved interruption state.
*/
void page_not_present(uint64_t vector, istate_t *istate)
{
region_register rr;
rid_t rid;
uintptr_t va;
pte_t *t;
va = istate->cr_ifa; /* faulting address */
rr.word = rr_read(VA2VRN(va));
rid = rr.map.rid;
page_table_lock(AS, true);
t = page_mapping_find(AS, va);
ASSERT(t);
if (t->p) {
/*
* If the Present bit is set in page hash table, just copy it
* and update ITC/DTC.
*/
if (t->x)
itc_pte_copy(t);
else
dtc_pte_copy(t);
page_table_unlock(AS, true);
} else {
page_table_unlock(AS, true);
if (as_page_fault(va, PF_ACCESS_READ, istate) == AS_PF_FAULT) {
fault_if_from_uspace(istate, "Page fault at %p", va);
panic("%s: va=%p, rid=%d\n", __func__, va, rid);
}
}
}
/** @}
*/