/*
 * Copyright © 2011 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Authors:
 *    Ben Widawsky <ben@bwidawsk.net>
 *
 */

#include "debug.h"

#define CR0_0_ME_STATE_CTRL (1 << 31)
#define CR0_0_BP_SUPPRESS (1 << 15)
#define CR0_0_SPF_EN (1 << 2)
#define CR0_0_ACC_DIS (1 << 1)
#define CR0_1_BES_CTRL (1 << 31)
#define CR0_1_HALT_CTRL (1 << 30)
#define CR0_1_SOFT_EXCEPTION_CTRL (1 << 29)
#define CR0_1_ILLGL_OP_STS (1 << 28)
#define CR0_1_STACK_OVRFLW_STS (1 << 27)

#define CR0_0_ENTRY_UNMASK (CR0_0_SPF_EN | CR0_0_ACC_DIS)
// TODO: Need to fix this for non breakpoint case
#define CR0_1_ENTRY_UNMASK ~(CR0_1_BES_CTRL)
#define CR0_0_RETURN_MASK ~(CR0_0_ME_STATE_CTRL | CR0_0_SPF_EN | CR0_0_ACC_DIS)

#ifndef SANDYBRIDGE
	#error Only SandyBridge is supported
#endif

/* Default flags for an instruction */
#define FLAGS { ALIGN1, SWITCH, MASK_DISABLE, ACCWRCTRL}

Enter:
	nop;

	or (1) cr0.0 cr0.0 CR0_0_ENTRY_UNMASK:ud FLAGS;

	/* Clear breakpoint status */
	and (1) cr0.1 cr0.1 CR0_1_ENTRY_UNMASK:ud FLAGS;

	/* set breakpoint suppress this should be conditional on bes */
	or  (1) cr0.0 cr0.0 CR0_0_BP_SUPPRESS:ud FLAGS;

	and (1) cr0.0 cr0.0 CR0_0_RETURN_MASK:ud FLAGS;
	nop;