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Kernel/aarch64: Implement Processor::initialize_context_switching

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This changes the stack pointer to the initial_thread stack pointer, and
pushes two pointers onto the stack that point to the initial_thread. The
function then jumps to the ip of the initial_thread, which will be
thread_context_first_enter, and hangs there because that function is not
yet implemented.
This commit is contained in:
Timon Kruiper 2022-12-27 16:41:52 +01:00 committed by Andrew Kaster
parent 892f81b01a
commit 262309d9bf
Notes: sideshowbarker 2024-07-17 02:27:44 +09:00 
Author: https://github.com/FireFox317
Commit: https://github.com/SerenityOS/serenity/commit/262309d9bf
Pull-request: https://github.com/SerenityOS/serenity/pull/16690
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/nico ✅
1 changed files with 24 additions and 2 deletions
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26
Kernel/Arch/aarch64/Processor.cpp
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@ -12,6 +12,7 @@
#include <Kernel/Arch/aarch64/ASM_wrapper.h>
#include <Kernel/Arch/aarch64/CPU.h>
#include <Kernel/InterruptDisabler.h>
#include <Kernel/Process.h>
#include <Kernel/Random.h>
#include <Kernel/Scheduler.h>
#include <Kernel/Thread.h>
@ -83,8 +84,29 @@ u32 Processor::smp_wake_n_idle_processors(u32 wake_count)
void Processor::initialize_context_switching(Thread& initial_thread)
{
(void)initial_thread;
TODO_AARCH64();
VERIFY(initial_thread.process().is_kernel_process());
m_scheduler_initialized = true;
// FIXME: Figure out if we need to call {pre_,post_,}init_finished once aarch64 supports SMP
Processor::set_current_in_scheduler(true);
auto& regs = initial_thread.regs();
// clang-format off
asm volatile(
"mov sp, %[new_sp] \n"
"sub sp, sp, 24 \n"
"str %[from_to_thread], [sp, #0] \n"
"str %[from_to_thread], [sp, #8] \n"
"br %[new_ip] \n"
:: [new_sp] "r" (regs.sp_el0),
[new_ip] "r" (regs.elr_el1),
[from_to_thread] "r" (&initial_thread)
);
// clang-format on
VERIFY_NOT_REACHED();
}
void Processor::switch_context(Thread*& from_thread, Thread*& to_thread)