drivers/char/tpm/tpm_ibmvtpm.h


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/*
 * Copyright (C) 2012 IBM Corporation
 *
 * Author: Ashley Lai <ashleydlai@gmail.com>
 *
 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
 *
 * Device driver for TCG/TCPA TPM (trusted platform module).
 * Specifications at www.trustedcomputinggroup.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, version 2 of the
 * License.
 *
 */

#ifndef __TPM_IBMVTPM_H__
#define __TPM_IBMVTPM_H__

/* vTPM Message Format 1 */
struct ibmvtpm_crq {
	u8 valid;
	u8 msg;
	__be16 len;
	__be32 data;
	__be64 reserved;
} __attribute__((packed, aligned(8)));

struct ibmvtpm_crq_queue {
	struct ibmvtpm_crq *crq_addr;
	u32 index;
	u32 num_entry;
};

struct ibmvtpm_dev {
	struct device *dev;
	struct vio_dev *vdev;
	struct ibmvtpm_crq_queue crq_queue;
	dma_addr_t crq_dma_handle;
	u32 rtce_size;
	void __iomem *rtce_buf;
	dma_addr_t rtce_dma_handle;
	spinlock_t rtce_lock;
	wait_queue_head_t wq;
	u16 res_len;
	u32 vtpm_version;
	bool tpm_processing_cmd;
};

#define CRQ_RES_BUF_SIZE	PAGE_SIZE

/* Initialize CRQ */
#define INIT_CRQ_CMD		0xC001000000000000LL /* Init cmd */
#define INIT_CRQ_COMP_CMD	0xC002000000000000LL /* Init complete cmd */
#define INIT_CRQ_RES		0x01	/* Init respond */
#define INIT_CRQ_COMP_RES	0x02	/* Init complete respond */
#define VALID_INIT_CRQ		0xC0	/* Valid command for init crq */

/* vTPM CRQ response is the message type | 0x80 */
#define VTPM_MSG_RES		0x80
#define IBMVTPM_VALID_CMD	0x80

/* vTPM CRQ message types */
#define VTPM_GET_VERSION			0x01
#define VTPM_GET_VERSION_RES			(0x01 | VTPM_MSG_RES)

#define VTPM_TPM_COMMAND			0x02
#define VTPM_TPM_COMMAND_RES			(0x02 | VTPM_MSG_RES)

#define VTPM_GET_RTCE_BUFFER_SIZE		0x03
#define VTPM_GET_RTCE_BUFFER_SIZE_RES		(0x03 | VTPM_MSG_RES)

#define VTPM_PREPARE_TO_SUSPEND			0x04
#define VTPM_PREPARE_TO_SUSPEND_RES		(0x04 | VTPM_MSG_RES)

#endif
/*
 *	X.25 Packet Layer release 002
 *
 *	This is ALPHA test software. This code may break your machine,
 *	randomly fail to work with new releases, misbehave and/or generally
 *	screw up. It might even work.
 *
 *	This code REQUIRES 2.1.15 or higher
 *
 *	This module:
 *		This module is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *	History
 *	X.25 001	Jonathan Naylor	Started coding.
 *	X.25 002	Jonathan Naylor	New timer architecture.
 *	2000-09-04	Henner Eisen	Prevented x25_output() skb leakage.
 *	2000-10-27	Henner Eisen	MSG_DONTWAIT for fragment allocation.
 *	2000-11-10	Henner Eisen	x25_send_iframe(): re-queued frames
 *					needed cleaned seq-number fields.
 */

#include <linux/slab.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/x25.h>

static int x25_pacsize_to_bytes(unsigned int pacsize)
{
	int bytes = 1;

	if (!pacsize)
		return 128;

	while (pacsize-- > 0)
		bytes *= 2;

	return bytes;
}

/*
 *	This is where all X.25 information frames pass.
 *
 *      Returns the amount of user data bytes sent on success
 *      or a negative error code on failure.
 */
int x25_output(struct sock *sk, struct sk_buff *skb)
{
	struct sk_buff *skbn;
	unsigned char header[X25_EXT_MIN_LEN];
	int err, frontlen, len;
	int sent=0, noblock = X25_SKB_CB(skb)->flags & MSG_DONTWAIT;
	struct x25_sock *x25 = x25_sk(sk);
	int header_len = x25->neighbour->extended ? X25_EXT_MIN_LEN :
						    X25_STD_MIN_LEN;
	int max_len = x25_pacsize_to_bytes(x25->facilities.pacsize_out);

	if (skb->len - header_len > max_len) {
		/* Save a copy of the Header */
		skb_copy_from_linear_data(skb, header, header_len);
		skb_pull(skb, header_len);

		frontlen = skb_headroom(skb);

		while (skb->len > 0) {
			release_sock(sk);
			skbn = sock_alloc_send_skb(sk, frontlen + max_len,
						   noblock, &err);
			lock_sock(sk);
			if (!skbn) {
				if (err == -EWOULDBLOCK && noblock){
					kfree_skb(skb);
					return sent;
				}
				SOCK_DEBUG(sk, "x25_output: fragment alloc"
					       " failed, err=%d, %d bytes "
					       "sent\n", err, sent);
				return err;
			}

			skb_reserve(skbn, frontlen);

			len = max_len > skb->len ? skb->len : max_len;

			/* Copy the user data */
			skb_copy_from_linear_data(skb, skb_put(skbn, len), len);
			skb_pull(skb, len);

			/* Duplicate the Header */
			skb_push(skbn, header_len);
			skb_copy_to_linear_data(skbn, header, header_len);

			if (skb->len > 0) {
				if (x25->neighbour->extended)
					skbn->data[3] |= X25_EXT_M_BIT;
				else
					skbn->data[2] |= X25_STD_M_BIT;
			}

			skb_queue_tail(&sk->sk_write_queue, skbn);
			sent += len;
		}

		kfree_skb(skb);
	} else {
		skb_queue_tail(&sk->sk_write_queue, skb);
		sent = skb->len - header_len;
	}
	return sent;
}

/*