/* SPDX-License-Identifier: GPL-2.0+ */
/*
 *  Copyright IBM Corp. 2001, 2012
 *  Author(s): Robert Burroughs
 *             Eric Rossman (edrossma@us.ibm.com)
 *
 *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
 *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
 *  MSGTYPE restruct:             Holger Dengler <hd@linux.vnet.ibm.com>
 */

#ifndef _ZCRYPT_MSGTYPE6_H_
#define _ZCRYPT_MSGTYPE6_H_

#include <asm/zcrypt.h>

#define MSGTYPE06_NAME                  "zcrypt_msgtype6"
#define MSGTYPE06_VARIANT_DEFAULT       0
#define MSGTYPE06_VARIANT_NORNG         1
#define MSGTYPE06_VARIANT_EP11          2

/**
 * The type 6 message family is associated with CEXxC/CEXxP cards.
 *
 * It contains a message header followed by a CPRB, both of which
 * are described below.
 *
 * Note that all reserved fields must be zeroes.
 */
struct type6_hdr {
        unsigned char reserved1;        /* 0x00                         */
        unsigned char type;             /* 0x06                         */
        unsigned char reserved2[2];     /* 0x0000                       */
        unsigned char right[4];         /* 0x00000000                   */
        unsigned char reserved3[2];     /* 0x0000                       */
        unsigned char reserved4[2];     /* 0x0000                       */
        unsigned char apfs[4];          /* 0x00000000                   */
        unsigned int  offset1;          /* 0x00000058 (offset to CPRB)  */
        unsigned int  offset2;          /* 0x00000000                   */
        unsigned int  offset3;          /* 0x00000000                   */
        unsigned int  offset4;          /* 0x00000000                   */
        unsigned char agent_id[16];     /* 0x4341000000000000           */
                                        /* 0x0000000000000000           */
        unsigned char rqid[2];          /* rqid.  internal to 603       */
        unsigned char reserved5[2];     /* 0x0000                       */
        unsigned char function_code[2]; /* for PKD, 0x5044 (ascii 'PD') */
        unsigned char reserved6[2];     /* 0x0000                       */
        unsigned int  tocardlen1;       /* (request CPRB len + 3) & -4  */
        unsigned int  tocardlen2;       /* db len 0x00000000 for PKD    */
        unsigned int  tocardlen3;       /* 0x00000000                   */
        unsigned int  tocardlen4;       /* 0x00000000                   */
        unsigned int  fromcardlen1;     /* response buffer length       */
        unsigned int  fromcardlen2;     /* db len 0x00000000 for PKD    */
        unsigned int  fromcardlen3;     /* 0x00000000                   */
        unsigned int  fromcardlen4;     /* 0x00000000                   */
} __packed;

/**
 * The type 86 message family is associated with CEXxC/CEXxP cards.
 *
 * It contains a message header followed by a CPRB.  The CPRB is
 * the same as the request CPRB, which is described above.
 *
 * If format is 1, an error condition exists and no data beyond
 * the 8-byte message header is of interest.
 *
 * The non-error message is shown below.
 *
 * Note that all reserved fields must be zeroes.
 */
struct type86_hdr {
        unsigned char reserved1;        /* 0x00                         */
        unsigned char type;             /* 0x86                         */
        unsigned char format;           /* 0x01 (error) or 0x02 (ok)    */
        unsigned char reserved2;        /* 0x00                         */
        unsigned char reply_code;       /* reply code (see above)       */
        unsigned char reserved3[3];     /* 0x000000                     */
} __packed;

#define TYPE86_RSP_CODE 0x86
#define TYPE87_RSP_CODE 0x87
#define TYPE86_FMT2     0x02

struct type86_fmt2_ext {
        unsigned char     reserved[4];  /* 0x00000000                   */
        unsigned char     apfs[4];      /* final status                 */
        unsigned int      count1;       /* length of CPRB + parameters  */
        unsigned int      offset1;      /* offset to CPRB               */
        unsigned int      count2;       /* 0x00000000                   */
        unsigned int      offset2;      /* db offset 0x00000000 for PKD */
        unsigned int      count3;       /* 0x00000000                   */
        unsigned int      offset3;      /* 0x00000000                   */
        unsigned int      count4;       /* 0x00000000                   */
        unsigned int      offset4;      /* 0x00000000                   */
} __packed;

int prep_cca_ap_msg(bool userspace, struct ica_xcRB *xcrb,
                    struct ap_message *ap_msg,
                    unsigned int *fc, unsigned short **dom);
int prep_ep11_ap_msg(bool userspace, struct ep11_urb *xcrb,
                     struct ap_message *ap_msg,
                     unsigned int *fc, unsigned int *dom);
int prep_rng_ap_msg(struct ap_message *ap_msg,
                    int *fc, unsigned int *dom);

#define LOW     10
#define MEDIUM  100
#define HIGH    500

int speed_idx_cca(int);
int speed_idx_ep11(int);

/**
 * Prepare a type6 CPRB message for random number generation
 *
 * @ap_dev: AP device pointer
 * @ap_msg: pointer to AP message
 */
static inline void rng_type6cprb_msgx(struct ap_message *ap_msg,
                                      unsigned int random_number_length,
                                      unsigned int *domain)
{
        struct {
                struct type6_hdr hdr;
                struct CPRBX cprbx;
                char function_code[2];
                short int rule_length;
                char rule[8];
                short int verb_length;
                short int key_length;
        } __packed * msg = ap_msg->msg;
        static struct type6_hdr static_type6_hdrX = {
                .type           = 0x06,
                .offset1        = 0x00000058,
                .agent_id       = {'C', 'A'},
                .function_code  = {'R', 'L'},
                .tocardlen1     = sizeof(*msg) - sizeof(msg->hdr),
                .fromcardlen1   = sizeof(*msg) - sizeof(msg->hdr),
        };
        static struct CPRBX local_cprbx = {
                .cprb_len       = 0x00dc,
                .cprb_ver_id    = 0x02,
                .func_id        = {0x54, 0x32},
                .req_parml      = sizeof(*msg) - sizeof(msg->hdr) -
                                  sizeof(msg->cprbx),
                .rpl_msgbl      = sizeof(*msg) - sizeof(msg->hdr),
        };

        msg->hdr = static_type6_hdrX;
        msg->hdr.fromcardlen2 = random_number_length;
        msg->cprbx = local_cprbx;
        msg->cprbx.rpl_datal = random_number_length;
        memcpy(msg->function_code, msg->hdr.function_code, 0x02);
        msg->rule_length = 0x0a;
        memcpy(msg->rule, "RANDOM  ", 8);
        msg->verb_length = 0x02;
        msg->key_length = 0x02;
        ap_msg->len = sizeof(*msg);
        *domain = (unsigned short)msg->cprbx.domain;
}

void zcrypt_msgtype6_init(void);
void zcrypt_msgtype6_exit(void);

#endif /* _ZCRYPT_MSGTYPE6_H_ */