haiku-beta6/headers/private/kernel/arch/x86/thread_struct.h

/*
 * Copyright 2002-2005, The Haiku Team. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
 * Distributed under the terms of the NewOS License.
 */
#ifndef _KERNEL_ARCH_x86_THREAD_STRUCT_H
#define _KERNEL_ARCH_x86_THREAD_STRUCT_H


#include <arch_cpu.h>


struct farcall {
	uint32 *esp;
	uint32 *ss;
};

#define	IFRAME_TRACE_DEPTH 4

struct iframe_stack {
	struct iframe *frames[IFRAME_TRACE_DEPTH];
	int32	index;
};

// architecture specific thread info
struct arch_thread {
	struct farcall current_stack;
	struct farcall interrupt_stack;

	// used to track interrupts on this thread
	struct iframe_stack	iframes;

	// 512 byte floating point save point
	uint8 fpu_state[512];
};

struct arch_team {
	// gcc treats empty structures as zero-length in C, but as if they contain
	// a char in C++. So we have to put a dummy in to be able to use the struct
	// from both in a consistent way.
	char	dummy;
};

struct arch_fork_arg {
	struct iframe	iframe;
};

#endif	/* _KERNEL_ARCH_x86_THREAD_STRUCT_H */