/* 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

/**
 * @brief A hardware stack frame on i386.
 * 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 i386_hw_frame {
	u32 eip;
	u16 cs;		u16 _pad0;
	u32 eflags;

	/*
	 * On i386, these two are only pushed when entering from another
	 * (i.e. lower) privilege level (???).  This effectively means they don't
	 * exist unless the CS above is equal to X86_32_USER_CS (arch/segment.h).
	 */
	u32 user_esp;
	u16 user_ss;	u16 _pad1;
} __packed;