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arm64: Fixes to the page fault handler.

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* Improve atomicity of PTE updates.
* Centralize a few constants.

Change-Id: Iaeeb82e9dc7f7ca97d13ba816fb72c6475754310
Reviewed-on: https://review.haiku-os.org/c/haiku/+/8171
Reviewed-by: waddlesplash <[email protected]>
Reviewed-by: Fredrik Holmqvist <[email protected]>
Tested-by: Commit checker robot <[email protected]>
This commit is contained in:
Owen Anderson
2024-09-03 21:33:08 +00:00
committed by waddlesplash
parent a64e78a34e
commit 50bb52021c
5 changed files with 47 additions and 46 deletions
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headers/private/kernel/arch/arm64/arch_vm_translation_map.h
+4
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@@ -5,6 +5,10 @@
#ifndef _KERNEL_ARCH_ARM64_ARCH_VM_TRANSLATION_MAP_H_
#define _KERNEL_ARCH_ARM64_ARCH_VM_TRANSLATION_MAP_H_
// The base address of TTBR*_EL1 is in bits [47:1] of the register, and the
// low bit is implicitly zero.
static constexpr uint64_t kTtbrBasePhysAddrMask = (((1UL << 47) - 1) << 1);
void arch_vm_install_empty_table_ttbr0(void);
#endif /* _KERNEL_ARCH_ARM64_ARCH_VM_TRANSLATION_MAP_H_ */
src/system/kernel/arch/arm64/VMSAv8TranslationMap.cpp
-23
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@@ -10,29 +10,6 @@
#include <vm/vm_page.h>
#include <vm/vm_priv.h>
static constexpr uint64_t kPteAddrMask = (((1UL << 36) - 1) << 12);
static constexpr uint64_t kPteAttrMask = ~(kPteAddrMask | 0x3);
static constexpr uint64_t kPteTLBCompatMask = (kPteAddrMask | (0x3 << 2) | (0x3 << 8));
static constexpr uint64_t kPteValidMask = 0x1;
static constexpr uint64_t kPteTypeMask = 0x3;
static constexpr uint64_t kPteTypeL012Table = 0x3;
static constexpr uint64_t kPteTypeL12Block = 0x1;
static constexpr uint64_t kPteTypeL3Page = 0x3;
static constexpr uint64_t kAttrSWDBM = (1UL << 55);
static constexpr uint64_t kAttrUXN = (1UL << 54);
static constexpr uint64_t kAttrPXN = (1UL << 53);
static constexpr uint64_t kAttrDBM = (1UL << 51);
static constexpr uint64_t kAttrNG = (1UL << 11);
static constexpr uint64_t kAttrAF = (1UL << 10);
static constexpr uint64_t kAttrSHInnerShareable = (3UL << 8);
static constexpr uint64_t kAttrAPReadOnly = (1UL << 7);
static constexpr uint64_t kAttrAPUserAccess = (1UL << 6);
static constexpr uint64_t kTLBIMask = ((1UL << 44) - 1);
uint32_t VMSAv8TranslationMap::fHwFeature;
uint64_t VMSAv8TranslationMap::fMair;
src/system/kernel/arch/arm64/VMSAv8TranslationMap.h
+23
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@@ -10,6 +10,29 @@
#include <vm/VMTranslationMap.h>
static constexpr uint64_t kPteAddrMask = (((1UL << 36) - 1) << 12);
static constexpr uint64_t kPteAttrMask = ~(kPteAddrMask | 0x3);
static constexpr uint64_t kPteTLBCompatMask = (kPteAddrMask | (0x3 << 2) | (0x3 << 8));
static constexpr uint64_t kPteValidMask = 0x1;
static constexpr uint64_t kPteTypeMask = 0x3;
static constexpr uint64_t kPteTypeL012Table = 0x3;
static constexpr uint64_t kPteTypeL12Block = 0x1;
static constexpr uint64_t kPteTypeL3Page = 0x3;
static constexpr uint64_t kAttrSWDBM = (1UL << 55);
static constexpr uint64_t kAttrUXN = (1UL << 54);
static constexpr uint64_t kAttrPXN = (1UL << 53);
static constexpr uint64_t kAttrDBM = (1UL << 51);
static constexpr uint64_t kAttrNG = (1UL << 11);
static constexpr uint64_t kAttrAF = (1UL << 10);
static constexpr uint64_t kAttrSHInnerShareable = (3UL << 8);
static constexpr uint64_t kAttrAPReadOnly = (1UL << 7);
static constexpr uint64_t kAttrAPUserAccess = (1UL << 6);
static constexpr uint64_t kTLBIMask = ((1UL << 44) - 1);
struct VMSAv8TranslationMap : public VMTranslationMap {
public:
VMSAv8TranslationMap(
src/system/kernel/arch/arm64/arch_int.cpp
+20 -16
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@@ -127,13 +127,6 @@ arch_int_init_post_device_manager(struct kernel_args *args)
static int page_bits = 12;
static constexpr uint64_t kPteAddrMask = (((1UL << 36) - 1) << 12);
static constexpr uint64_t kPteAttrMask = ~(kPteAddrMask | 0x3);
static constexpr uint64_t kAttrSWDBM = (1UL << 55);
static constexpr uint64_t kAttrAF = (1UL << 10);
static constexpr uint64_t kAttrAP2 = (1UL << 7);
static uint64_t*
TableFromPa(phys_addr_t pa)
{
@@ -154,21 +147,31 @@ fixup_entry(phys_addr_t ptPa, int level, addr_t va, bool wr)
int index = (va >> shift) & tableMask;
uint64_t *pte = &TableFromPa(ptPa)[index];
uint64_t oldPte = atomic_get64((int64*)pte);
int type = *pte & 0x3;
uint64_t addr = *pte & kPteAddrMask;
int type = oldPte & kPteTypeMask;
uint64_t addr = oldPte & kPteAddrMask;
if ((level == 3 && type == 0x3) || (level < 3 && type == 0x1)) {
if (!wr && (*pte & kAttrAF) == 0) {
atomic_or64((int64*)pte, kAttrAF);
if ((level == 3 && type == kPteTypeL3Page) || (level < 3 && type == kPteTypeL12Block)) {
if (!wr && (oldPte & kAttrAF) == 0) {
uint64_t newPte = oldPte | kAttrAF;
if ((uint64_t)atomic_test_and_set64((int64*)pte, newPte, oldPte) != oldPte)
return true; // If something changed, handle it by taking another fault
asm("dsb ishst");
asm("isb");
return true;
}
if (wr && (*pte & kAttrSWDBM) != 0 && (*pte & kAttrAP2) != 0) {
atomic_and64((int64*)pte, ~kAttrAP2);
asm("tlbi vaae1is, %0 \n dsb ish"::"r"(va >> page_bits));
if (wr && (oldPte & kAttrSWDBM) != 0 && (oldPte & kAttrAPReadOnly) != 0) {
uint64_t newPte = oldPte & ~kAttrAPReadOnly;
if ((uint64_t)atomic_test_and_set64((int64*)pte, newPte, oldPte) != oldPte)
return true;
asm("dsb ishst");
asm("tlbi vaae1is, %0" :: "r" ((va >> 12) & kTLBIMask));
asm("dsb ish");
asm("isb");
return true;
}
} else if (level < 3 && type == 0x3) {
} else if (level < 3 && type == kPteTypeL012Table) {
return fixup_entry(addr, level + 1, va, wr);
}
@@ -251,6 +254,7 @@ do_sync_handler(iframe * frame)
ptPa = READ_SPECIALREG(TTBR1_EL1);
else
ptPa = READ_SPECIALREG(TTBR0_EL1);
ptPa &= kTtbrBasePhysAddrMask;
switch (frame->esr & ISS_DATA_DFSC_MASK) {
case ISS_DATA_DFSC_TF_L0:
src/system/kernel/arch/arm64/arch_vm_translation_map.cpp
-7
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@@ -15,10 +15,6 @@
static char sPhysicalPageMapperData[sizeof(PMAPPhysicalPageMapper)];
// The base address of TTBR*_EL1 is in bits [47:1] of the register, and the
// low bit is implicitly zero.
static constexpr uint64_t kTtbrBasePhysAddrMask = (((1UL << 47) - 1) << 1);
// Physical pointer to an empty page table, which is used for break-before-make
// when updating TTBR0_EL1.
static phys_addr_t sEmptyTable;
@@ -145,9 +141,6 @@ arch_vm_translation_map_init_post_area(kernel_args* args)
// TODO: reuse some bits from VMSAv8TranslationMap
static constexpr uint64_t kPteAddrMask = (((1UL << 36) - 1) << 12);
static constexpr uint64_t kPteAttrMask = ~(kPteAddrMask | 0x3);
static uint64_t page_bits = 12;
static uint64_t tsz = 16;