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135ab6ec8f
The last in-kernel user of errno is gone, so we should remove the definition and everything referring to it. This also removes the now-unused lib/execve.c file that was introduced earlier. Also remove every trace of __KERNEL_SYSCALLS__ that still remained in the kernel. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Andi Kleen <ak@muc.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ian Molton <spyro@f2s.com> Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Hirokazu Takata <takata.hirokazu@renesas.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Richard Curnow <rc@rc0.org.uk> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp> Cc: Chris Zankel <chris@zankel.net> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
272 lines
6.3 KiB
C
272 lines
6.3 KiB
C
/*
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*
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* dvb_ringbuffer.c: ring buffer implementation for the dvb driver
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*
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* Copyright (C) 2003 Oliver Endriss
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* Copyright (C) 2004 Andrew de Quincey
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*
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* based on code originally found in av7110.c & dvb_ci.c:
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* Copyright (C) 1999-2003 Ralph Metzler
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* & Marcus Metzler for convergence integrated media GmbH
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <asm/uaccess.h>
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#include "dvb_ringbuffer.h"
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#define PKT_READY 0
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#define PKT_DISPOSED 1
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void dvb_ringbuffer_init(struct dvb_ringbuffer *rbuf, void *data, size_t len)
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{
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rbuf->pread=rbuf->pwrite=0;
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rbuf->data=data;
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rbuf->size=len;
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rbuf->error=0;
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init_waitqueue_head(&rbuf->queue);
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spin_lock_init(&(rbuf->lock));
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}
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int dvb_ringbuffer_empty(struct dvb_ringbuffer *rbuf)
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{
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return (rbuf->pread==rbuf->pwrite);
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}
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ssize_t dvb_ringbuffer_free(struct dvb_ringbuffer *rbuf)
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{
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ssize_t free;
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free = rbuf->pread - rbuf->pwrite;
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if (free <= 0)
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free += rbuf->size;
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return free-1;
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}
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ssize_t dvb_ringbuffer_avail(struct dvb_ringbuffer *rbuf)
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{
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ssize_t avail;
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avail = rbuf->pwrite - rbuf->pread;
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if (avail < 0)
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avail += rbuf->size;
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return avail;
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}
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void dvb_ringbuffer_flush(struct dvb_ringbuffer *rbuf)
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{
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rbuf->pread = rbuf->pwrite;
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rbuf->error = 0;
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}
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void dvb_ringbuffer_flush_spinlock_wakeup(struct dvb_ringbuffer *rbuf)
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{
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unsigned long flags;
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spin_lock_irqsave(&rbuf->lock, flags);
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dvb_ringbuffer_flush(rbuf);
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spin_unlock_irqrestore(&rbuf->lock, flags);
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wake_up(&rbuf->queue);
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}
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ssize_t dvb_ringbuffer_read(struct dvb_ringbuffer *rbuf, u8 *buf, size_t len, int usermem)
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{
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size_t todo = len;
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size_t split;
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split = (rbuf->pread + len > rbuf->size) ? rbuf->size - rbuf->pread : 0;
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if (split > 0) {
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if (!usermem)
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memcpy(buf, rbuf->data+rbuf->pread, split);
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else
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if (copy_to_user(buf, rbuf->data+rbuf->pread, split))
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return -EFAULT;
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buf += split;
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todo -= split;
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rbuf->pread = 0;
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}
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if (!usermem)
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memcpy(buf, rbuf->data+rbuf->pread, todo);
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else
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if (copy_to_user(buf, rbuf->data+rbuf->pread, todo))
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return -EFAULT;
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rbuf->pread = (rbuf->pread + todo) % rbuf->size;
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return len;
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}
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ssize_t dvb_ringbuffer_write(struct dvb_ringbuffer *rbuf, const u8 *buf, size_t len)
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{
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size_t todo = len;
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size_t split;
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split = (rbuf->pwrite + len > rbuf->size) ? rbuf->size - rbuf->pwrite : 0;
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if (split > 0) {
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memcpy(rbuf->data+rbuf->pwrite, buf, split);
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buf += split;
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todo -= split;
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rbuf->pwrite = 0;
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}
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memcpy(rbuf->data+rbuf->pwrite, buf, todo);
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rbuf->pwrite = (rbuf->pwrite + todo) % rbuf->size;
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return len;
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}
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ssize_t dvb_ringbuffer_pkt_write(struct dvb_ringbuffer *rbuf, u8* buf, size_t len)
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{
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int status;
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ssize_t oldpwrite = rbuf->pwrite;
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DVB_RINGBUFFER_WRITE_BYTE(rbuf, len >> 8);
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DVB_RINGBUFFER_WRITE_BYTE(rbuf, len & 0xff);
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DVB_RINGBUFFER_WRITE_BYTE(rbuf, PKT_READY);
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status = dvb_ringbuffer_write(rbuf, buf, len);
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if (status < 0) rbuf->pwrite = oldpwrite;
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return status;
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}
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ssize_t dvb_ringbuffer_pkt_read(struct dvb_ringbuffer *rbuf, size_t idx,
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int offset, u8* buf, size_t len, int usermem)
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{
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size_t todo;
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size_t split;
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size_t pktlen;
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pktlen = rbuf->data[idx] << 8;
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pktlen |= rbuf->data[(idx + 1) % rbuf->size];
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if (offset > pktlen) return -EINVAL;
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if ((offset + len) > pktlen) len = pktlen - offset;
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idx = (idx + DVB_RINGBUFFER_PKTHDRSIZE + offset) % rbuf->size;
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todo = len;
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split = ((idx + len) > rbuf->size) ? rbuf->size - idx : 0;
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if (split > 0) {
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if (!usermem)
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memcpy(buf, rbuf->data+idx, split);
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else
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if (copy_to_user(buf, rbuf->data+idx, split))
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return -EFAULT;
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buf += split;
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todo -= split;
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idx = 0;
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}
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if (!usermem)
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memcpy(buf, rbuf->data+idx, todo);
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else
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if (copy_to_user(buf, rbuf->data+idx, todo))
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return -EFAULT;
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return len;
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}
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void dvb_ringbuffer_pkt_dispose(struct dvb_ringbuffer *rbuf, size_t idx)
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{
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size_t pktlen;
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rbuf->data[(idx + 2) % rbuf->size] = PKT_DISPOSED;
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// clean up disposed packets
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while(dvb_ringbuffer_avail(rbuf) > DVB_RINGBUFFER_PKTHDRSIZE) {
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if (DVB_RINGBUFFER_PEEK(rbuf, 2) == PKT_DISPOSED) {
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pktlen = DVB_RINGBUFFER_PEEK(rbuf, 0) << 8;
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pktlen |= DVB_RINGBUFFER_PEEK(rbuf, 1);
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DVB_RINGBUFFER_SKIP(rbuf, pktlen + DVB_RINGBUFFER_PKTHDRSIZE);
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} else {
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// first packet is not disposed, so we stop cleaning now
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break;
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}
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}
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}
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ssize_t dvb_ringbuffer_pkt_next(struct dvb_ringbuffer *rbuf, size_t idx, size_t* pktlen)
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{
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int consumed;
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int curpktlen;
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int curpktstatus;
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if (idx == -1) {
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idx = rbuf->pread;
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} else {
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curpktlen = rbuf->data[idx] << 8;
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curpktlen |= rbuf->data[(idx + 1) % rbuf->size];
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idx = (idx + curpktlen + DVB_RINGBUFFER_PKTHDRSIZE) % rbuf->size;
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}
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consumed = (idx - rbuf->pread) % rbuf->size;
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while((dvb_ringbuffer_avail(rbuf) - consumed) > DVB_RINGBUFFER_PKTHDRSIZE) {
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curpktlen = rbuf->data[idx] << 8;
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curpktlen |= rbuf->data[(idx + 1) % rbuf->size];
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curpktstatus = rbuf->data[(idx + 2) % rbuf->size];
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if (curpktstatus == PKT_READY) {
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*pktlen = curpktlen;
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return idx;
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}
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consumed += curpktlen + DVB_RINGBUFFER_PKTHDRSIZE;
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idx = (idx + curpktlen + DVB_RINGBUFFER_PKTHDRSIZE) % rbuf->size;
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}
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// no packets available
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return -1;
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}
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EXPORT_SYMBOL(dvb_ringbuffer_init);
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EXPORT_SYMBOL(dvb_ringbuffer_empty);
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EXPORT_SYMBOL(dvb_ringbuffer_free);
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EXPORT_SYMBOL(dvb_ringbuffer_avail);
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EXPORT_SYMBOL(dvb_ringbuffer_flush);
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EXPORT_SYMBOL(dvb_ringbuffer_flush_spinlock_wakeup);
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EXPORT_SYMBOL(dvb_ringbuffer_read);
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EXPORT_SYMBOL(dvb_ringbuffer_write);
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EXPORT_SYMBOL(dvb_ringbuffer_pkt_write);
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EXPORT_SYMBOL(dvb_ringbuffer_pkt_read);
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EXPORT_SYMBOL(dvb_ringbuffer_pkt_dispose);
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EXPORT_SYMBOL(dvb_ringbuffer_pkt_next);
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