arm64: Fixes to the page fault handler.

* 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]>
2024-09-03 21:33:08 +00:00
parent a64e78a34e
commit 50bb52021c
5 changed files with 47 additions and 46 deletions
@@ -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_ */