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Kernel/aarch64: Implement Thread Local Storage

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This commit adds Processor::set_thread_specific_data, and this function
is used to factor out architecture specific implementation of setting
the thread specific data. This function is implemented for
aarch64 and x86_64, and the callsites are changed to use this function
instead.
This commit is contained in:
Timon Kruiper 2023-02-15 19:49:37 +01:00 • committed by Jelle Raaijmakers
parent 7d0917f50b
commit cfd73e5d9f
6 changed files with 24 additions and 6 deletions
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5
Kernel/Arch/aarch64/ASM_wrapper.h
View file

@ -37,6 +37,11 @@ inline void set_sp_el1(FlatPtr sp_el1)
asm("msr sp_el1, %[value]" ::[value] "r"(sp_el1));
}
inline void set_tpidr_el0(FlatPtr tpidr_el0)
{
asm("msr tpidr_el0, %[value]" ::[value] "r"(tpidr_el0));
}
inline void flush()
{
asm("dsb ish");

7
Kernel/Arch/aarch64/Processor.cpp
View file

@ -454,6 +454,8 @@ extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread)
to_thread->set_cpu(Processor::current().id());
Processor::set_thread_specific_data(to_thread->thread_specific_data());
auto in_critical = to_thread->saved_critical();
VERIFY(in_critical > 0);
Processor::restore_critical(in_critical);
@ -466,4 +468,9 @@ StringView Processor::platform_string()
return "aarch64"sv;
}
void Processor::set_thread_specific_data(VirtualAddress thread_specific_data)
{
Aarch64::Asm::set_tpidr_el0(thread_specific_data.get());
}
}

2
Kernel/Arch/aarch64/Processor.h
View file

@ -279,6 +279,8 @@ public:
static StringView platform_string();
static void set_thread_specific_data(VirtualAddress thread_specific_data);
private:
Processor(Processor const&) = delete;

9
Kernel/Arch/x86_64/Processor.cpp
View file

@ -1543,8 +1543,7 @@ extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread)
}
auto& processor = Processor::current();
MSR fs_base_msr(MSR_FS_BASE);
fs_base_msr.set(to_thread->thread_specific_data().get());
Processor::set_thread_specific_data(to_thread->thread_specific_data());
if (from_regs.cr3 != to_regs.cr3)
write_cr3(to_regs.cr3);
@ -1887,4 +1886,10 @@ UNMAP_AFTER_INIT void Processor::initialize_context_switching(Thread& initial_th
VERIFY_NOT_REACHED();
}
void Processor::set_thread_specific_data(VirtualAddress thread_specific_data)
{
MSR fs_base_msr(MSR_FS_BASE);
fs_base_msr.set(thread_specific_data.get());
}
}

2
Kernel/Arch/x86_64/Processor.h
View file

@ -419,6 +419,8 @@ public:
static ErrorOr<Vector<FlatPtr, 32>> capture_stack_trace(Thread& thread, size_t max_frames = 0);
static StringView platform_string();
static void set_thread_specific_data(VirtualAddress thread_specific_data);
};
}

5
Kernel/Syscalls/mmap.cpp
View file

@ -566,10 +566,7 @@ ErrorOr<FlatPtr> Process::sys$allocate_tls(Userspace<char const*> initial_data,
TRY(main_thread->make_thread_specific_region({}));
#if ARCH(X86_64)
MSR fs_base_msr(MSR_FS_BASE);
fs_base_msr.set(main_thread->thread_specific_data().get());
#endif
Processor::set_thread_specific_data(main_thread->thread_specific_data());
return m_master_tls_region.unsafe_ptr()->vaddr().get();
});