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Kernel/aarch64: Set Access Permission EL0 bit for userspace mappings

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This bit was not set, which was causing Permission Faults when executing
in userspace.
This commit is contained in:
Timon Kruiper 2023-01-27 14:26:04 +01:00 • committed by Linus Groh
parent 187723776a
commit 163e3ac90b
1 changed files with 4 additions and 6 deletions
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10
Kernel/Arch/aarch64/PageDirectory.h
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@ -40,10 +40,8 @@ constexpr u32 INNER_SHAREABLE = (3 << 8);
constexpr u32 NORMAL_MEMORY = (0 << 2);
constexpr u32 DEVICE_MEMORY = (1 << 2);
constexpr u32 ACCESS_PERMISSION_READWRITE = (0b00 << 6);
constexpr u32 ACCESS_PERMISSION_READWRITE_EL0 = (0b01 << 6);
constexpr u32 ACCESS_PERMISSION_READONLY = (0b10 << 6);
constexpr u32 ACCESS_PERMISSION_READONLY_EL0 = (0b11 << 6);
constexpr u32 ACCESS_PERMISSION_EL0 = (1 << 6);
constexpr u32 ACCESS_PERMISSION_READONLY = (1 << 7);
// Figure D5-15 of Arm Architecture Reference Manual Armv8 - page D5-2588
class PageDirectoryEntry {
@ -127,8 +125,8 @@ public:
bool is_present() const { return (raw() & Present) == Present; }
void set_present(bool b) { set_bit(Present, b); }
bool is_user_allowed() const { TODO_AARCH64(); }
void set_user_allowed(bool) { }
bool is_user_allowed() const { return (raw() & ACCESS_PERMISSION_EL0) == ACCESS_PERMISSION_EL0; }
void set_user_allowed(bool b) { set_bit(ACCESS_PERMISSION_EL0, b); }
bool is_writable() const { return !((raw() & ACCESS_PERMISSION_READONLY) == ACCESS_PERMISSION_READONLY); }
void set_writable(bool b) { set_bit(ACCESS_PERMISSION_READONLY, !b); }