/*
 * \brief   Kernel back-end for execution contexts in userland
 * \author  Martin Stein
 * \author  Reto Buerki
 * \author  Stefan Kalkowski
 * \date    2013-11-11
 */

/*
 * Copyright (C) 2013-2017 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU Affero General Public License version 3.
 */

/* core includes */
#include "../../kernel/cpu.h"
#include "../../kernel/thread.h"
#include "../../kernel/pd.h"

void Kernel::Thread::Tlb_invalidation::execute()
{
	/* invalidate cpu-local TLB */
	Cpu::invalidate_tlb();

	/* if this is the last cpu, wake up the caller thread */
	if (--cnt == 0) {
		cpu_pool().work_list().remove(&_le);
		caller._restart();
	}
};


void Kernel::Thread::_call_update_data_region() { }


void Kernel::Thread::_call_update_instr_region() { }


void Kernel::Thread::proceed(Cpu & cpu)
{
	cpu.switch_to(*regs, pd().mmu_regs);

	asm volatile("fxrstor (%1)    \n"
	             "mov  %0, %%rsp  \n"
	             "popq %%r8       \n"
	             "popq %%r9       \n"
	             "popq %%r10      \n"
	             "popq %%r11      \n"
	             "popq %%r12      \n"
	             "popq %%r13      \n"
	             "popq %%r14      \n"
	             "popq %%r15      \n"
	             "popq %%rax      \n"
	             "popq %%rbx      \n"
	             "popq %%rcx      \n"
	             "popq %%rdx      \n"
	             "popq %%rdi      \n"
	             "popq %%rsi      \n"
	             "popq %%rbp      \n"
	             "add  $16, %%rsp \n"
	             "iretq           \n"
	             :: "r" (&regs->r8), "r" (regs->fpu_context()));
}


void Kernel::Thread::user_ret_time(Kernel::time_t const t)  { regs->rdi = t;   }
void Kernel::Thread::user_arg_0(Kernel::Call_arg const arg) { regs->rdi = arg; }
void Kernel::Thread::user_arg_1(Kernel::Call_arg const arg) { regs->rsi = arg; }
void Kernel::Thread::user_arg_2(Kernel::Call_arg const arg) { regs->rdx = arg; }
void Kernel::Thread::user_arg_3(Kernel::Call_arg const arg) { regs->rcx = arg; }
void Kernel::Thread::user_arg_4(Kernel::Call_arg const arg) { regs->r8 = arg; }

Kernel::Call_arg Kernel::Thread::user_arg_0() const { return regs->rdi; }
Kernel::Call_arg Kernel::Thread::user_arg_1() const { return regs->rsi; }
Kernel::Call_arg Kernel::Thread::user_arg_2() const { return regs->rdx; }
Kernel::Call_arg Kernel::Thread::user_arg_3() const { return regs->rcx; }
Kernel::Call_arg Kernel::Thread::user_arg_4() const { return regs->r8; }