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kernel/arm/paging: use simplified permission model

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Change-Id: Ie0ed357ee9ca5bee4c10c6cbf74eaba77acdd179
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6435
Reviewed-by: Fredrik Holmqvist <[email protected]>
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: David Karoly <[email protected]>
This commit is contained in:
David Karoly
2023-05-16 18:07:45 +00:00
parent c10c49daf7
commit 84745ade1b
3 changed files with 16 additions and 28 deletions
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headers/private/kernel/arch/arm/arm_mmu.h
+1 -1
View File
@@ -97,7 +97,7 @@
#define ARM_PTE_ADDRESS_MASK 0xfffff000 #define ARM_PTE_ADDRESS_MASK 0xfffff000
#define ARM_PTE_TYPE_MASK 0x00000003 #define ARM_PTE_TYPE_MASK 0x00000003
#define ARM_PTE_PROTECTION_MASK 0x00000231 // AP[2:0], XN #define ARM_PTE_PROTECTION_MASK 0x00000221 // AP[2:1], XN
#define ARM_PTE_MEMORY_TYPE_MASK 0x000001cc // TEX, B, C #define ARM_PTE_MEMORY_TYPE_MASK 0x000001cc // TEX, B, C
#endif /* _ARCH_ARM_ARM_MMU_H */ #endif /* _ARCH_ARM_ARM_MMU_H */
src/system/kernel/arch/arm/paging/32bit/ARMPagingMethod32Bit.cpp
+1
View File
@@ -510,6 +510,7 @@ ARMPagingMethod32Bit::PutPageTableEntryInTable(page_table_entry* entry,
| ARM_MMU_L2_TYPE_SMALLNEW | ARM_MMU_L2_TYPE_SMALLNEW
| MemoryTypeToPageTableEntryFlags(memoryType) | MemoryTypeToPageTableEntryFlags(memoryType)
| AttributesToPageTableEntryFlags(attributes) | AttributesToPageTableEntryFlags(attributes)
| ARM_MMU_L2_FLAG_AP0
| (globalPage ? 0 : ARM_MMU_L2_FLAG_NG); | (globalPage ? 0 : ARM_MMU_L2_FLAG_NG);
// put it in the page table // put it in the page table
src/system/kernel/arch/arm/paging/32bit/ARMPagingMethod32Bit.h
+14 -27
View File
@@ -146,25 +146,20 @@ ARMPagingMethod32Bit::ClearPageTableEntryFlags(page_table_entry* entry, uint32 f
/*static*/ inline uint32 /*static*/ inline uint32
ARMPagingMethod32Bit::AttributesToPageTableEntryFlags(uint32 attributes) ARMPagingMethod32Bit::AttributesToPageTableEntryFlags(uint32 attributes)
{ {
int apFlags = 0; int apFlags;
if ((attributes & B_WRITE_AREA) != 0) { if ((attributes & B_READ_AREA) != 0) {
// kernel rw user rw // user accessible
apFlags = ARM_MMU_L2_FLAG_AP1 | ARM_MMU_L2_FLAG_AP0; apFlags = ARM_MMU_L2_FLAG_AP1;
} else if ((attributes & B_READ_AREA) != 0) { if ((attributes & B_WRITE_AREA) == 0) {
if ((attributes & B_KERNEL_WRITE_AREA) != 0) { apFlags |= ARM_MMU_L2_FLAG_AP2;
// kernel rw user ro
apFlags = ARM_MMU_L2_FLAG_AP1;
} else {
// kernel ro user ro
apFlags = ARM_MMU_L2_FLAG_AP2 | ARM_MMU_L2_FLAG_AP1;
} }
} else if ((attributes & B_KERNEL_WRITE_AREA) != 0) { } else if ((attributes & B_KERNEL_WRITE_AREA) == 0) {
// kernel rw
apFlags = ARM_MMU_L2_FLAG_AP0;
} else {
// kernel ro // kernel ro
apFlags = ARM_MMU_L2_FLAG_AP2 | ARM_MMU_L2_FLAG_AP0; apFlags = ARM_MMU_L2_FLAG_AP2;
} else {
// kernel rw
apFlags = 0;
} }
if (((attributes & B_KERNEL_EXECUTE_AREA) == 0) && if (((attributes & B_KERNEL_EXECUTE_AREA) == 0) &&
@@ -183,23 +178,15 @@ ARMPagingMethod32Bit::PageTableEntryFlagsToAttributes(uint32 pageTableEntry)
if ((pageTableEntry & ARM_MMU_L2_FLAG_AP2) == 0) { if ((pageTableEntry & ARM_MMU_L2_FLAG_AP2) == 0) {
if ((pageTableEntry & ARM_MMU_L2_FLAG_AP1) != 0) { if ((pageTableEntry & ARM_MMU_L2_FLAG_AP1) != 0) {
if ((pageTableEntry & ARM_MMU_L2_FLAG_AP0) != 0) attributes = B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA | B_READ_AREA | B_WRITE_AREA;
attributes = B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA | B_READ_AREA | B_WRITE_AREA;
else
attributes = B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA | B_READ_AREA;
} else { } else {
if ((pageTableEntry & ARM_MMU_L2_FLAG_AP0) != 0) attributes = B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA;
attributes = B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA;
else
attributes = 0;
} }
} else { } else {
if ((pageTableEntry & ARM_MMU_L2_FLAG_AP1) != 0) if ((pageTableEntry & ARM_MMU_L2_FLAG_AP1) != 0)
attributes = B_KERNEL_READ_AREA | B_READ_AREA; attributes = B_KERNEL_READ_AREA | B_READ_AREA;
else if ((pageTableEntry & ARM_MMU_L2_FLAG_AP0) != 0)
attributes = B_KERNEL_READ_AREA;
else else
attributes = 0; attributes = B_KERNEL_READ_AREA;
} }
if ((pageTableEntry & ARM_MMU_L2_FLAG_XN) == 0) { if ((pageTableEntry & ARM_MMU_L2_FLAG_XN) == 0) {