/* Copyright (C) 2021,2022 fef <owo@fef.moe>.  All rights reserved. */

#pragma once

#ifndef _ARCH_INTERRUPT_H_
#error "This file is not meant to be included directly, use <arch/interrupt.h>"
#endif

/*
 * XXX it's probably not necessary to declare this struct __packed and add
 * paddings for the cs and ss members manually, because all members *should*
 * get aligned to 8 bytes automatically.  I'm absolutely not in the mood for
 * verifying this right now tho, so we're playing it safe.
 */

/**
 * @brief A hardware stack frame on amd64.
 * I have no idea whether x86 people are actually calling it hardware stack
 * frame tbh, this is just the (ARM) terminology i'm used to.  Either way,
 * this is what gets pushed to the stack automatically when entering an ISR.
 */
struct amd64_hw_frame {
	u64 rip;
	u16 cs;		u16 _pad0; u32 _pad1;
	u64 rflags;

	/* unlike on i386, the amd64 *always* pushes %rsp and %ss */
	u64 rsp;
	u16 ss;		u16 _pad2; u32 _pad3;
} __packed;