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Import of OpenBSD 4.2 release kernel tree with initial code to support 
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO

Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)

/*	$OpenBSD: arc4.c,v 1.2 2007/07/24 19:35:20 damien Exp $	*/
/*
 * Copyright (c) 2003 Markus Friedl <markus@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>                                                         

#include <crypto/arc4.h> 

#define RC4SWAP(x,y) \
	do { \
		u_int8_t t = ctx->state[x];  \
		ctx->state[x] = ctx->state[y]; \
		ctx->state[y] = t; \
	} while(0)

void
rc4_keysetup(struct rc4_ctx *ctx, u_char *key, u_int32_t klen)
{
	u_int8_t x, y;
	u_int32_t i;

	x = y = 0;
	for (i = 0; i < RC4STATE; i++)
		ctx->state[i] = i;
	for (i = 0; i < RC4STATE; i++) {
		y = (key[x] + ctx->state[i] + y) % RC4STATE;
		RC4SWAP(i, y);
		x = (x + 1) % klen;
	}
	ctx->x = ctx->y = 0;
}

void
rc4_crypt(struct rc4_ctx *ctx, u_char *src, u_char *dst,
    u_int32_t len)
{
	u_int32_t i;

	for (i = 0; i < len; i++) {
		ctx->x = (ctx->x + 1) % RC4STATE;
		ctx->y = (ctx->state[ctx->x] + ctx->y) % RC4STATE;
		RC4SWAP(ctx->x, ctx->y);
		dst[i] = src[i] ^ ctx->state[
		   (ctx->state[ctx->x] + ctx->state[ctx->y]) % RC4STATE];
	}
}

void
rc4_skip(struct rc4_ctx *ctx, u_int32_t len)
{
	for (; len > 0; len--) {
		ctx->x = (ctx->x + 1) % RC4STATE;
		ctx->y = (ctx->state[ctx->x] + ctx->y) % RC4STATE;
		RC4SWAP(ctx->x, ctx->y);
	}
}