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/*
* Copyright (c) 2022, Timon Kruiper <timonkruiper@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Types.h>
#include <Kernel/Library/StdLib.h>
#include <Kernel/Memory/AddressSpace.h>
namespace Kernel {
struct ThreadRegisters {
u64 x[31];
u64 spsr_el1;
u64 elr_el1;
u64 sp_el0;
u64 ttbr0_el1;
FlatPtr ip() const { return elr_el1; }
void set_ip(FlatPtr value) { elr_el1 = value; }
FlatPtr sp() const { return sp_el0; }
void set_sp(FlatPtr value) { sp_el0 = value; }
void set_initial_state(bool is_kernel_process, Memory::AddressSpace& space, FlatPtr kernel_stack_top)
{
set_sp(kernel_stack_top);
ttbr0_el1 = space.page_directory().ttbr0();
set_spsr_el1(is_kernel_process);
}
void set_entry_function(FlatPtr entry_ip, FlatPtr entry_data)
{
set_ip(entry_ip);
x[0] = entry_data;
}
void set_exec_state(FlatPtr entry_ip, FlatPtr userspace_sp, Memory::AddressSpace& space)
{
set_ip(entry_ip);
set_sp(userspace_sp);
ttbr0_el1 = space.page_directory().ttbr0();
set_spsr_el1(false);
}
void set_spsr_el1(bool is_kernel_process)
{
Aarch64::SPSR_EL1 saved_program_status_register_el1 = {};
// Don't mask any interrupts, so all interrupts are enabled when transfering into the new context
saved_program_status_register_el1.D = 0;
saved_program_status_register_el1.A = 0;
saved_program_status_register_el1.I = 0;
saved_program_status_register_el1.F = 0;
saved_program_status_register_el1.M = is_kernel_process ? Aarch64::SPSR_EL1::Mode::EL1h : Aarch64::SPSR_EL1::Mode::EL0t;
memcpy(&spsr_el1, &saved_program_status_register_el1, sizeof(u64));
}
};
}
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