path: root/sys/dev/pci/aeon.c

/*	$OpenBSD: aeon.c,v 1.4 1999/12/06 07:29:56 art Exp $	*/

/*
 * Invertex AEON driver
 * Copyright (c) 1999 Invertex Inc. All rights reserved.
 * Copyright (c) 1999 Theo de Raadt
 *
 * This driver is based on a previous driver by Invertex, for which they
 * requested:  Please send any comments, feedback, bug-fixes, or feature
 * requests to software@invertex.com.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/pmap.h>
#include <machine/pmap.h>
#include <sys/device.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>

#include <dev/pci/aeonvar.h>
#include <dev/pci/aeonreg.h>

#define AEON_DEBUG

/*
 * Prototypes and count for the pci_device structure
 */
int aeon_probe		__P((struct device *, void *, void *));
void aeon_attach	__P((struct device *, struct device *, void *));

struct cfattach aeon_ca = {
	sizeof(struct aeon_softc), aeon_probe, aeon_attach,
};

struct cfdriver aeon_cd = {
	0, "aeon", DV_DULL
};

void	aeon_reset_board	__P((struct aeon_softc *));
int	aeon_enable_crypto	__P((struct aeon_softc *));
void	aeon_init_dma	__P((struct aeon_softc *));
void	aeon_init_pci_registers __P((struct aeon_softc *));
int	aeon_checkram __P((struct aeon_softc *));
int	aeon_intr		__P((void *));
u_int	aeon_write_command __P((const struct aeon_command_buf_data *,
	    u_int8_t *));
int	aeon_build_command __P((const struct aeon_command * cmd,
	    struct aeon_command_buf_data *));
int	aeon_mbuf __P((struct mbuf *, int *np, long *pp, int *lp, int maxp,
	    int *nicealign));

/*
 * Used for round robin crypto requests
 */
int aeon_num_devices = 0;
struct aeon_softc *aeon_devices[AEON_MAX_DEVICES];

int
aeon_probe(parent, match, aux)
	struct device *parent;
	void *match;
	void *aux;
{
	struct pci_attach_args *pa = (struct pci_attach_args *) aux;

	if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_INVERTEX &&
	    PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_INVERTEX_AEON)
		return (1);
	return (0);
}

void 
aeon_attach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct aeon_softc *sc = (struct aeon_softc *)self;
	struct pci_attach_args *pa = aux;
	pci_chipset_tag_t pc = pa->pa_pc;
	pci_intr_handle_t ih;
	const char *intrstr = NULL;
	bus_addr_t iobase;
	bus_size_t iosize;
	u_int32_t cmd;

	cmd = pci_conf_read(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
	cmd |= PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE |
	    PCI_COMMAND_MASTER_ENABLE;
	pci_conf_write(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG, cmd);
	cmd = pci_conf_read(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);

	if (!(cmd & PCI_COMMAND_MEM_ENABLE)) {
		printf(": failed to enable memory mapping\n");
		return;
	}

	if (pci_mem_find(pc, pa->pa_tag, PCI_BASE_ADDRESS_0, &iobase, &iosize,
	    NULL)){
		printf(": can't find mem space\n");
		return;
	}
	if (bus_space_map(pa->pa_memt, iobase, iosize, 0, &sc->sc_sh0)) {
		printf(": can't map mem space\n");
		return;
	}
	sc->sc_st0 = pa->pa_memt;

	if (pci_mem_find(pc, pa->pa_tag, PCI_BASE_ADDRESS_1, &iobase, &iosize,
	    NULL)){
		printf(": can't find mem space\n");
		return;
	}
	if (bus_space_map(pa->pa_memt, iobase, iosize, 0, &sc->sc_sh1)) {
		printf(": can't map mem space\n");
		return;
	}
	sc->sc_st1 = pa->pa_memt;
	printf(" mem %x %x", sc->sc_sh0, sc->sc_sh1);

#if defined(UVM)
	sc->sc_dma = (struct aeon_dma *)uvm_pagealloc_contig(sizeof(*sc->sc_dma),
	    0x100000, 0xffffffff, PAGE_SIZE);
#else
	sc->sc_dma = (struct aeon_dma *)vm_page_alloc_contig(sizeof(*sc->sc_dma),
	    0x100000, 0xffffffff, PAGE_SIZE);
#endif
	bzero(sc->sc_dma, sizeof(*sc->sc_dma));

	aeon_reset_board(sc);

	if (aeon_enable_crypto(sc) != 0) {
		printf("%s: crypto enabling failed\n",
		    sc->sc_dv.dv_xname);
		return;
	}

	aeon_init_dma(sc);
	aeon_init_pci_registers(sc);

	if (aeon_checkram(sc) != 0)
		sc->sc_drammodel = 1;

	/*
	 * Reinitialize again, since the DRAM/SRAM detection shifted our ring
	 * pointers and may have changed the value we send to the RAM Config
	 * Register.
	 */
	aeon_reset_board(sc);
	aeon_init_dma(sc);
	aeon_init_pci_registers(sc);

	if (pci_intr_map(pc, pa->pa_intrtag, pa->pa_intrpin,
	    pa->pa_intrline, &ih)) {
		printf(": couldn't map interrupt\n");
		return;
	}
	intrstr = pci_intr_string(pc, ih);
	sc->sc_ih = pci_intr_establish(pc, ih, IPL_NET, aeon_intr, sc,
	    self->dv_xname);
	if (sc->sc_ih == NULL) {
		printf(": couldn't establish interrupt\n");
		if (intrstr != NULL)
			printf(" at %s", intrstr);
		printf("\n");
		return;
	}

	aeon_devices[aeon_num_devices] = sc;
	aeon_num_devices++;

	printf(": %s\n", intrstr);
}

/*
 * Resets the board.  Values in the regesters are left as is
 * from the reset (i.e. initial values are assigned elsewhere).
 */
void
aeon_reset_board(sc)
	struct aeon_softc *sc;
{
	/*
	 * Set polling in the DMA configuration register to zero.  0x7 avoids
	 * resetting the board and zeros out the other fields.
	 */
	WRITE_REG_1(sc, AEON_DMA_CFG, AEON_DMA_CFG_NOBOARDRESET |
	    AEON_DMA_CFG_NODMARESET | AEON_DMA_CFG_NEED);

	/*
	 * Now that polling has been disabled, we have to wait 1 ms
	 * before resetting the board.
	 */
	DELAY(1000);

	/* Reset the board.  We do this by writing zeros to the DMA reset
	 * field, the BRD reset field, and the manditory 1 at position 2.
	 * Every other field is set to zero.
	 */
	WRITE_REG_1(sc, AEON_DMA_CFG, AEON_DMA_CFG_NEED);

	/*
	 * Wait another millisecond for the board to reset.
	 */
	DELAY(1000);

	/*
	 * Turn off the reset!  (No joke.)
	 */
	WRITE_REG_1(sc, AEON_DMA_CFG, AEON_DMA_CFG_NOBOARDRESET |
	    AEON_DMA_CFG_NODMARESET | AEON_DMA_CFG_NEED);
}

/*
 * Checks to see if crypto is already enabled.  If crypto isn't enable,
 * "aeon_enable_crypto" is called to enable it.  The check is important,
 * as enabling crypto twice will lock the board.
 */
int 
aeon_enable_crypto(sc)
	struct aeon_softc *sc;
{
	u_int32_t encryption_level;

	/*
	 * The RAM config register's encrypt level bit needs to be set before
	 * every read performed on the encryption level register.
	 */
	WRITE_REG_0(sc, AEON_RAM_CONFIG,
	    READ_REG_0(sc, AEON_RAM_CONFIG) | (0x1 << 5));

	encryption_level = READ_REG_0(sc, AEON_CRYPTLEVEL);

	/*
	 * Make sure we don't re-unlock.  Two unlocks kills chip until the
	 * next reboot.
	 */
	if (encryption_level == 0x1020 || encryption_level == 0x1120) {
#ifdef AEON_DEBUG
		printf("%s: Strong Crypto already enabled!\n",
		    sc->sc_dv.dv_xname);
#endif
		return 0;	/* success */
	}

	/**
	 **
	 **   Rest of unlock procedure removed.
	 **
	 **
	 **/

	switch(encryption_level) {
	case 0x3020:
		printf(" no encr/auth");
		break;
	case 0x1020:
		printf(" DES");
		break;
	case 0x1120:
		printf(" FULL");
		break;
	default:
		printf(" disabled");
		break;
	}

	return 0;
}

/*
 * Give initial values to the registers listed in the "Register Space"
 * section of the AEON Software Development reference manual.
 */
void 
aeon_init_pci_registers(sc)
	struct aeon_softc *sc;
{
	/* write fixed values needed by the Initialization registers */
	WRITE_REG_0(sc, AEON_INIT_1, 0x2);
	WRITE_REG_0(sc, AEON_INIT_2, 0x400);
	WRITE_REG_0(sc, AEON_INIT_3, 0x200);

	/* write all 4 ring address registers */
	WRITE_REG_1(sc, AEON_CMDR_ADDR, vtophys(sc->sc_dma->cmdr));
	WRITE_REG_1(sc, AEON_SRCR_ADDR, vtophys(sc->sc_dma->srcr));
	WRITE_REG_1(sc, AEON_DSTR_ADDR, vtophys(sc->sc_dma->dstr));
	WRITE_REG_1(sc, AEON_RESR_ADDR, vtophys(sc->sc_dma->resr));

	/* write status register */
	WRITE_REG_1(sc, AEON_STATUS, AEON_INIT_STATUS_REG);
	WRITE_REG_1(sc, AEON_IRQEN, AEON_INIT_INTERRUPT_ENABLE_REG);

#if 0
#if BYTE_ORDER == BIG_ENDIAN
	    (0x1 << 7) |
#endif
#endif
	WRITE_REG_0(sc, AEON_RAM_CONFIG, AEON_INIT_RAM_CONFIG_REG |
	    sc->sc_drammodel << 4);

	WRITE_REG_0(sc, AEON_EXPAND, AEON_INIT_EXPAND_REG);
	WRITE_REG_1(sc, AEON_DMA_CFG, AEON_INIT_DMA_CONFIG_REG);
}

/*
 * There are both DRAM and SRAM models of the aeon board.
 * A bit in the "ram configuration register" needs to be
 * set according to the model.  The driver will guess one
 * way or the other -- and then call this routine to verify.
 *
 * 0: RAM setting okay,  -1: Current RAM setting in error
 */
int 
aeon_checkram(sc)
	struct aeon_softc *sc;
{
	aeon_base_command_t write_command = {(0x3 << 13), 0, 8, 0};
	aeon_base_command_t read_command = {(0x2 << 13), 0, 0, 8};
	u_int8_t data[8] = {'1', '2', '3', '4', '5', '6', '7', '8'};
	u_int8_t *source_buf, *dest_buf;
	struct aeon_dma *dma = sc->sc_dma;
	const u_int32_t masks = AEON_D_VALID | AEON_D_LAST |
	    AEON_D_MASKDONEIRQ;

#if (AEON_D_RSIZE < 3)
#error "descriptor ring size too small DRAM/SRAM check"
#endif

	/*
	 * We steal the 8 bytes needed for both the source and dest buffers
	 * from the 3rd slot that the DRAM/SRAM test won't use.
	 */
	source_buf = sc->sc_dma->command_bufs[2];
	dest_buf = sc->sc_dma->result_bufs[2];

	/* build write command */
	*(aeon_base_command_t *) sc->sc_dma->command_bufs[0] = write_command;
	bcopy(data, source_buf, sizeof(data));

	dma->srcr[0].p = vtophys(source_buf);
	dma->dstr[0].p = vtophys(dest_buf);

	dma->cmdr[0].l = 16 | masks;
	dma->srcr[0].l = 8 | masks;
	dma->dstr[0].l = 8 | masks;
	dma->resr[0].l = AEON_MAX_RESULT | masks;

	DELAY(1000);	/* let write command execute */
	if (dma->resr[0].l & AEON_D_VALID)
		printf("%s: SRAM/DRAM detection error -- result[0] valid still set\n",
		    sc->sc_dv.dv_xname);

	/* Build read command */
	*(aeon_base_command_t *) sc->sc_dma->command_bufs[1] = read_command;

	dma->srcr[1].p = vtophys(source_buf);
	dma->dstr[1].p = vtophys(dest_buf);
	dma->cmdr[1].l = 16 | masks;
	dma->srcr[1].l = 8 | masks;
	dma->dstr[1].l = 8 | masks;
	dma->resr[1].l = AEON_MAX_RESULT | masks;

	DELAY(1000);	/* let read command execute */
	if (dma->resr[1].l & AEON_D_VALID)
		printf("%s: SRAM/DRAM detection error -- result[1] valid still set\n",
		    sc->sc_dv.dv_xname);
	return (memcmp(dest_buf, data, sizeof(data)) == 0) ? 0 : -1;
}

/*
 * Initialize the descriptor rings.
 */
void 
aeon_init_dma(sc)
	struct aeon_softc *sc;
{
	struct aeon_dma *dma = sc->sc_dma;
	int i;

	/* initialize static pointer values */
	for (i = 0; i < AEON_D_CMD_RSIZE; i++)
		dma->cmdr[i].p = vtophys(dma->command_bufs[i]);
	for (i = 0; i < AEON_D_RES_RSIZE; i++)
		dma->resr[i].p = vtophys(dma->result_bufs[i]);

	dma->cmdr[AEON_D_CMD_RSIZE].p = vtophys(dma->cmdr);
	dma->srcr[AEON_D_SRC_RSIZE].p = vtophys(dma->srcr);
	dma->dstr[AEON_D_DST_RSIZE].p = vtophys(dma->dstr);
	dma->resr[AEON_D_RES_RSIZE].p = vtophys(dma->resr);
}

/*
 * Writes out the raw command buffer space.  Returns the
 * command buffer size.
 */
u_int
aeon_write_command(const struct aeon_command_buf_data *cmd_data,
    u_int8_t *command_buf)
{
	u_int8_t *command_buf_pos = command_buf;
	const aeon_base_command_t *base_cmd = &cmd_data->base_cmd;
	const aeon_mac_command_t *mac_cmd = &cmd_data->mac_cmd;
	const aeon_crypt_command_t *crypt_cmd = &cmd_data->crypt_cmd;
	int     using_mac = base_cmd->masks & AEON_BASE_CMD_MAC;
	int     using_crypt = base_cmd->masks & AEON_BASE_CMD_CRYPT;

	/* write base command structure */
	*((aeon_base_command_t *) command_buf_pos) = *base_cmd;
	command_buf_pos += sizeof(aeon_base_command_t);

	/* Write MAC command structure */
	if (using_mac) {
		*((aeon_mac_command_t *) command_buf_pos) = *mac_cmd;
		command_buf_pos += sizeof(aeon_mac_command_t);
	}

	/* Write encryption command structure */
	if (using_crypt) {
		*((aeon_crypt_command_t *) command_buf_pos) = *crypt_cmd;
		command_buf_pos += sizeof(aeon_crypt_command_t);
	}

	/* write MAC key */
	if (mac_cmd->masks & AEON_MAC_NEW_KEY) {
		bcopy(cmd_data->mac, command_buf_pos, AEON_MAC_KEY_LENGTH);
		command_buf_pos += AEON_MAC_KEY_LENGTH;
	}

	/* Write crypto key */
	if (crypt_cmd->masks & AEON_CRYPT_CMD_NEW_KEY) {
		u_int32_t alg = crypt_cmd->masks & AEON_CRYPT_CMD_ALG_MASK;
		u_int32_t key_len = (alg == AEON_CRYPT_CMD_ALG_DES) ?
		AEON_DES_KEY_LENGTH : AEON_3DES_KEY_LENGTH;
		bcopy(cmd_data->ck, command_buf_pos, key_len);
		command_buf_pos += key_len;
	}

	/* Write crypto iv */
	if (crypt_cmd->masks & AEON_CRYPT_CMD_NEW_IV) {
		bcopy(cmd_data->iv, command_buf_pos, AEON_IV_LENGTH);
		command_buf_pos += AEON_IV_LENGTH;
	}

	/* Write 8 zero bytes we're not sending crypt or MAC structures */
	if (!(base_cmd->masks & AEON_BASE_CMD_MAC) &&
	    !(base_cmd->masks & AEON_BASE_CMD_CRYPT)) {
		*((u_int32_t *) command_buf_pos) = 0;
		command_buf_pos += 4;
		*((u_int32_t *) command_buf_pos) = 0;
		command_buf_pos += 4;
	}

	if ((command_buf_pos - command_buf) > AEON_MAX_COMMAND)
		printf("aeon: Internal Error -- Command buffer overflow.\n");
	return command_buf_pos - command_buf;
}

/*
 * Check command input and build up structure to write
 * the command buffer later.  Returns 0 on success and
 * -1 if given bad command input was given.
 */
int 
aeon_build_command(const struct aeon_command *cmd,
    struct aeon_command_buf_data * cmd_buf_data)
{
#define AEON_COMMAND_CHECKING

	u_int32_t flags = cmd->flags;
	aeon_base_command_t *base_cmd = &cmd_buf_data->base_cmd;
	aeon_mac_command_t *mac_cmd = &cmd_buf_data->mac_cmd;
	aeon_crypt_command_t *crypt_cmd = &cmd_buf_data->crypt_cmd;
	u_int   mac_length;
#ifdef AEON_COMMAND_CHECKING
	int     dest_diff;
#endif

	bzero(cmd_buf_data, sizeof(struct aeon_command_buf_data));

#ifdef AEON_COMMAND_CHECKING
	if (!(!!(flags & AEON_DECODE) ^ !!(flags & AEON_ENCODE))) {
		printf("aeon: encode/decode setting error\n");
		return -1;
	}
	if ((flags & AEON_CRYPT_DES) && (flags & AEON_CRYPT_3DES)) {
		printf("aeon: Too many crypto algorithms set in command\n");
		return -1;
	}
	if ((flags & AEON_MAC_SHA1) && (flags & AEON_MAC_MD5)) {
		printf("aeon: Too many MAC algorithms set in command\n");
		return -1;
	}
#endif


	/*
	 * Compute the mac value length -- leave at zero if not MAC'ing
	 */
	mac_length = 0;
	if (AEON_USING_MAC(flags)) {
		mac_length = (flags & AEON_MAC_TRUNC) ? AEON_MAC_TRUNC_LENGTH :
		    ((flags & AEON_MAC_MD5) ? AEON_MD5_LENGTH : AEON_SHA1_LENGTH);
	}
#ifdef AEON_COMMAND_CHECKING
	/*
	 * Check for valid src/dest buf sizes
	 */

	/*
	 *  XXX XXX  We need to include header counts into all these
	 *           checks!!!!
	 */

	if (cmd->src_npa <= mac_length) {
		printf("aeon:  command source buffer has no data\n");
		return -1;
	}
	dest_diff = (flags & AEON_ENCODE) ? mac_length : -mac_length;
	if (cmd->dst_npa < cmd->dst_npa + dest_diff) {
		printf("aeon:  command dest length %u too short -- needed %u\n",
		    cmd->dst_npa, cmd->dst_npa + dest_diff);
		return -1;
	}
#endif

	/*
	 * Set MAC bit
	 */
	if (AEON_USING_MAC(flags))
		base_cmd->masks |= AEON_BASE_CMD_MAC;

	/* Set Encrypt bit */
	if (AEON_USING_CRYPT(flags))
		base_cmd->masks |= AEON_BASE_CMD_CRYPT;

	/*
	 * Set Decode bit
	 */
	if (flags & AEON_DECODE)
		base_cmd->masks |= AEON_BASE_CMD_DECODE;

	/*
	 * Set total source and dest counts.  These values are the same as the
	 * values set in the length field of the source and dest descriptor rings.
	 */
	base_cmd->total_source_count = cmd->src_l;
	base_cmd->total_dest_count = cmd->dst_l;

	/*
	 * XXX -- We need session number range checking...
	 */
	base_cmd->session_num = cmd->session_num;

	/**
	 **  Building up mac command
	 **
	 **/
	if (AEON_USING_MAC(flags)) {

		/*
		 * Set the MAC algorithm and trunc setting
		 */
		mac_cmd->masks |= (flags & AEON_MAC_MD5) ?
		    AEON_MAC_CMD_ALG_MD5 : AEON_MAC_CMD_ALG_SHA1;
		if (flags & AEON_MAC_TRUNC)
			mac_cmd->masks |= AEON_MAC_CMD_TRUNC;

		/*
	         * We always use HMAC mode, assume MAC values are appended to the
	         * source buffer on decodes and we append them to the dest buffer
	         * on encodes, and order auth/encryption engines as needed by
	         * IPSEC
	         */
		mac_cmd->masks |= AEON_MAC_CMD_MODE_HMAC | AEON_MAC_CMD_APPEND |
		    AEON_MAC_CMD_POS_IPSEC;

		/*
	         * Setup to send new MAC key if needed.
	         */
		if (flags & AEON_MAC_NEW_KEY) {
			mac_cmd->masks |= AEON_MAC_CMD_NEW_KEY;
			cmd_buf_data->mac = cmd->mac;
		}
		/*
	         * Set the mac header skip and source count.
	         */
		mac_cmd->header_skip = cmd->mac_header_skip;
		mac_cmd->source_count = cmd->src_npa - cmd->mac_header_skip;
		if (flags & AEON_DECODE)
			mac_cmd->source_count -= mac_length;
	}

	if (AEON_USING_CRYPT(flags)) {
		/*
	         * Set the encryption algorithm bits.
	         */
		crypt_cmd->masks |= (flags & AEON_CRYPT_DES) ?
		    AEON_CRYPT_CMD_ALG_DES : AEON_CRYPT_CMD_ALG_3DES;

		/* We always use CBC mode and send a new IV (as needed by
		 * IPSec). */
		crypt_cmd->masks |= AEON_CRYPT_CMD_MODE_CBC | AEON_CRYPT_CMD_NEW_IV;

		/*
	         * Setup to send new encrypt key if needed.
	         */
		if (flags & AEON_CRYPT_CMD_NEW_KEY) {
			crypt_cmd->masks |= AEON_CRYPT_CMD_NEW_KEY;
			cmd_buf_data->ck = cmd->ck;
		}
		/*
	         * Set the encrypt header skip and source count.
	         */
		crypt_cmd->header_skip = cmd->crypt_header_skip;
		crypt_cmd->source_count = cmd->src_npa - cmd->crypt_header_skip;
		if (flags & AEON_DECODE)
			crypt_cmd->source_count -= mac_length;


#ifdef AEON_COMMAND_CHECKING
		if (crypt_cmd->source_count % 8 != 0) {
			printf("aeon:  Error -- encryption source %u not a multiple of 8!\n",
			    crypt_cmd->source_count);
			return -1;
		}
#endif
	}
	cmd_buf_data->iv = cmd->iv;


#if 1
	printf("aeon: command parameters"
	    " -- session num %u"
	    " -- base t.s.c: %u"
	    " -- base t.d.c: %u"
	    " -- mac h.s. %u  s.c. %u"
	    " -- crypt h.s. %u  s.c. %u\n",
	    base_cmd->session_num, base_cmd->total_source_count,
	    base_cmd->total_dest_count, mac_cmd->header_skip,
	    mac_cmd->source_count, crypt_cmd->header_skip,
	    crypt_cmd->source_count);
#endif

	return 0;		/* success */
}

int
aeon_mbuf(m, np, pp, lp, maxp, nicep)
	struct mbuf *m;
	int *np;
	long *pp;
	int *lp;
	int maxp;
	int *nicep;
{
	struct	mbuf *m0;
	int npa = *np;
	int tlen = 0;

	/* generate a [pa,len] array from an mbuf */
	npa = 0;
	for (m0 = m; m; m = m->m_next) {
		void *va;
		long pg, npg;
		int len, off;

		va = m->m_data;
		len = m->m_len;
		tlen += len;

		lp[npa] = len;
		pp[npa] = vtophys(va);
		pg = pp[npa] & ~PAGE_MASK;
		off = (long)va & PAGE_MASK;

		while (len + off > PAGE_SIZE) {
			va = va + PAGE_SIZE - off;
			npg = vtophys(va);
			if (npg != pg) {
				/* FUCKED UP condition */
				npa++;
				continue;
			}
			lp[npa] = PAGE_SIZE - off;
			off = 0;
			++npa;
			if (npa > maxp)
				return (0);
			lp[npa] = len - (PAGE_SIZE - off);
			len -= lp[npa];
			pp[npa] = vtophys(va);
		} 
	}

	if (nicep) {
		int nice = 1;
		int i;

		/* see if each [pa,len] entry is long-word aligned */
		for (i = 0; i < npa; i++)
			if ((lp[i] & 3) || (pp[i] & 3))
				nice = 0;
		*nicep = nice;
	}

	*np = npa;
	return (tlen);
}

int 
aeon_crypto(struct aeon_command *cmd)
{
	u_int32_t cmdlen;
	static u_int32_t current_device = 0;
	struct	aeon_softc *sc;
	struct	aeon_dma *dma;
	struct	aeon_command_buf_data cmd_buf_data;
	int	cmdi, srci, dsti, resi, nicealign = 0;
	int     error, s, i;

	/* Pick the aeon board to send the data to.  Right now we use a round
	 * robin approach. */
	sc = aeon_devices[current_device++];
	if (current_device == aeon_num_devices)
		current_device = 0;
	dma = sc->sc_dma;

	if (cmd->src_npa == 0 && cmd->src_m)
		cmd->src_l = aeon_mbuf(cmd->src_m, &cmd->src_npa,
		    cmd->src_packp, cmd->src_packl, MAX_SCATTER, &nicealign);
	if (cmd->src_l == 0)
		return (-1);

	if (nicealign == 0) {
		cmd->dst_l = cmd->src_l;
		MGETHDR(cmd->dst_m, M_DONTWAIT, MT_DATA);
		if (cmd->dst_m == NULL)
			return (-1);
		if (cmd->src_l > MHLEN) {
			MCLGET(cmd->dst_m, M_DONTWAIT);
			if ((cmd->dst_m->m_flags & M_EXT) == 0) {
				m_freem(cmd->dst_m);
				return (-1);
			}
		}
	} else
		cmd->dst_m = cmd->src_m;

	cmd->dst_l = aeon_mbuf(cmd->dst_m, &cmd->dst_npa,
	    cmd->dst_packp, cmd->dst_packl, MAX_SCATTER, NULL);
	if (cmd->dst_l == 0)
		return (-1);

	if (aeon_build_command(cmd, &cmd_buf_data) != 0)
		return AEON_CRYPTO_BAD_INPUT;

	printf("%s: Entering cmd: stat %8x ien %8x u %d/%d/%d/%d n %d/%d\n",
	    sc->sc_dv.dv_xname,
	    READ_REG_1(sc, AEON_STATUS), READ_REG_1(sc, AEON_IRQEN),
	    dma->cmdu, dma->srcu, dma->dstu, dma->resu, cmd->src_npa,
	    cmd->dst_npa);

	s = splimp();

	/*
	 * need 1 cmd, and 1 res
	 * need N src, and N dst
	 */
	while (dma->cmdu+1 > AEON_D_CMD_RSIZE ||
	    dma->srcu+cmd->src_npa > AEON_D_SRC_RSIZE ||
	    dma->dstu+cmd->dst_npa > AEON_D_DST_RSIZE ||
	    dma->resu+1 > AEON_D_RES_RSIZE) {
		if (cmd->flags & AEON_DMA_FULL_NOBLOCK) {
			splx(s);
			return (AEON_CRYPTO_RINGS_FULL);
		}
		tsleep((caddr_t) dma, PZERO, "aeonring", 1);
	}

	if (dma->cmdi == AEON_D_CMD_RSIZE) {
		cmdi = 0, dma->cmdi = 1;
		dma->cmdr[AEON_D_CMD_RSIZE].l = AEON_D_VALID | AEON_D_LAST |
		    AEON_D_MASKDONEIRQ | AEON_D_JUMP;
	} else
		cmdi = dma->cmdi++;

	if (dma->resi == AEON_D_RES_RSIZE) {
		resi = 0, dma->resi = 1;
		dma->resr[AEON_D_RES_RSIZE].l = AEON_D_VALID | AEON_D_LAST |
		    AEON_D_MASKDONEIRQ | AEON_D_JUMP;
	} else
		resi = dma->resi++;

	cmdlen = aeon_write_command(&cmd_buf_data, dma->command_bufs[cmdi]);
	dma->aeon_commands[cmdi] = cmd;
	/* .p for command/result already set */
	dma->cmdr[cmdi].l = cmdlen | AEON_D_VALID | AEON_D_LAST |
	    AEON_D_MASKDONEIRQ;
	dma->cmdu += 1;

	for (i = 0; i < cmd->src_npa; i++) {
		int last = 0;

		if (i == cmd->src_npa-1)
			last = AEON_D_LAST;

		if (dma->srci == AEON_D_SRC_RSIZE) {
			srci = 0, dma->srci = 1;
			dma->srcr[AEON_D_SRC_RSIZE].l = AEON_D_VALID |
			    AEON_D_MASKDONEIRQ | AEON_D_JUMP;
		} else
			srci = dma->srci++;
		dma->srcr[srci].p = vtophys(cmd->src_packp[i]);
		dma->srcr[srci].l = cmd->src_packl[i] | AEON_D_VALID |
		    AEON_D_MASKDONEIRQ | last;
	}
	dma->srcu += cmd->src_npa;

	for (i = 0; i < cmd->dst_npa; i++) {
		int last = 0;

		if (dma->dsti == AEON_D_DST_RSIZE) {
			dsti = 0, dma->dsti = 1;
			dma->dstr[AEON_D_DST_RSIZE].l = AEON_D_VALID |
			    AEON_D_MASKDONEIRQ | AEON_D_JUMP;
		} else
			dsti = dma->dsti++;
		dma->dstr[dsti].p = vtophys(cmd->dst_packp[i]);
		dma->dstr[dsti].l = cmd->dst_packl[i] | AEON_D_VALID |
		    AEON_D_MASKDONEIRQ | last;
	}
	dma->dstu += cmd->dst_npa;

	/*
	 * Unlike other descriptors, we don't mask done interrupt from
	 * result descriptor.
	 */
	dma->resr[resi].l = AEON_MAX_RESULT | AEON_D_VALID | AEON_D_LAST;
	dma->resu += 1;

	/*
	 * We don't worry about missing an interrupt (which a waiting
	 * on command interrupt salvages us from), unless there is more
	 * than one command in the queue.
	 */
	if (dma->slots_in_use > 1) {
		WRITE_REG_1(sc, AEON_IRQEN,
		    AEON_INTR_ON_RESULT_DONE | AEON_INTR_ON_COMMAND_WAITING);
	}

	/*
	 * If not given a callback routine, we block until the dest data is
	 * ready.  (Setting interrupt timeout at 3 seconds.)
	 */
	if (cmd->dest_ready_callback == NULL) {
		printf("%s: no callback -- we're sleeping\n",
		    sc->sc_dv.dv_xname);
		error = tsleep((caddr_t) & dma->resr[resi], PZERO, "CRYPT",
		    hz * 3);
		if (error != 0)
			printf("%s: timed out waiting for interrupt"
			    " -- tsleep() exited with %d\n",
			    sc->sc_dv.dv_xname, error);
	}

	printf("%s: command: stat %8x ier %8x\n",
	    sc->sc_dv.dv_xname,
	    READ_REG_1(sc, AEON_STATUS), READ_REG_1(sc, AEON_IRQEN));

	splx(s);
	return 0;		/* success */
}

int 
aeon_intr(arg)
	void *arg;
{
	struct aeon_softc *sc = arg;
	struct aeon_dma *dma = sc->sc_dma;

	printf("%s: irq: stat %8x ien %8x u %d/%d/%d/%d\n",
	    sc->sc_dv.dv_xname,
	    READ_REG_1(sc, AEON_STATUS), READ_REG_1(sc, AEON_IRQEN),
	    dma->cmdu, dma->srcu, dma->dstu, dma->resu);
	
	if (dma->slots_in_use == 0 && (READ_REG_1(sc, AEON_STATUS) & (1 << 2))) {
		/*
		 * If no slots to process and we received a "waiting on
		 * result" interrupt, we disable the "waiting on result"
		 * (by clearing it).
		 */
		WRITE_REG_1(sc, AEON_IRQEN, AEON_INTR_ON_RESULT_DONE);
	} else {
		if (dma->slots_in_use > AEON_D_RSIZE)
			printf("%s: Internal Error -- ring overflow\n",
			    sc->sc_dv.dv_xname);

		while (dma->slots_in_use > 0) {
			u_int32_t wake_pos = dma->wakeup_rpos;
			struct aeon_command *cmd = dma->aeon_commands[wake_pos];
	
			/* if still valid, stop processing */
			if (dma->resr[wake_pos].l & AEON_D_VALID)
				break;
	
			if (AEON_USING_MAC(cmd->flags) && (cmd->flags & AEON_DECODE)) {
				u_int8_t *result_buf = dma->result_bufs[wake_pos];
	
				cmd->result_status = (result_buf[8] & 0x2) ?
				    AEON_MAC_BAD : 0;
				printf("%s: byte index 8 of result 0x%02x\n",
				    sc->sc_dv.dv_xname, (u_int32_t) result_buf[8]);
			}
	
			/* position is done, notify producer with wakup or callback */
			if (cmd->dest_ready_callback == NULL)
				wakeup((caddr_t) &dma->resr[wake_pos]);
			else
				cmd->dest_ready_callback(cmd);
	
			if (++dma->wakeup_rpos == AEON_D_RSIZE)
				dma->wakeup_rpos = 0;
			dma->slots_in_use--;
		}
	}

	/*
	 * Clear "result done" and "waiting on command ring" flags in status
	 * register.  If we still have slots to process and we received a
	 * waiting interrupt, this will interupt us again.
	 */
	WRITE_REG_1(sc, AEON_STATUS, (1 << 20) | (1 << 2));
	return (1);
}