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Diffstat (limited to 'devio/dev.h')
| -rw-r--r-- | devio/dev.h | 147 |
1 files changed, 0 insertions, 147 deletions
diff --git a/devio/dev.h b/devio/dev.h deleted file mode 100644 index de51d788..00000000 --- a/devio/dev.h +++ /dev/null @@ -1,147 +0,0 @@ -/* A handle on a mach device. - - Copyright (C) 1995 Free Software Foundation, Inc. - - Written by Miles Bader <miles@gnu.ai.mit.edu> - - 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; either version 2, or (at - your option) any later version. - - This program is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ - -#ifndef __DEV_H__ -#define __DEV_H__ - -#include <mach.h> -#include <device/device.h> - -#include "iostate.h" - -/* #define FAKE */ -#define MSG - -#ifdef MSG -#include <stdio.h> -#include <string.h> -#include <unistd.h> -extern FILE *debug; -extern struct mutex debug_lock; -#endif - -/* ---------------------------------------------------------------- */ - -/* Information about a kernel device. */ -struct dev -{ - /* The device port for the kernel device we're doing paging on. */ - device_t port; - /* The mach device name which we opened. */ - char *name; - - /* The total size of DEV. */ - vm_size_t size; - - /* The block size of DEV. I/O to DEV must occur in multiples of - block_size. */ - int dev_block_size; - /* The block size in which we will do I/O; this must be a multiple of - DEV_BLOCK_SIZE. */ - int block_size; - - /* Various attributes of this device (see below for the DEV_ flag bits). - This field is constant. */ - int flags; - - /* Current state of our output stream -- location and the buffer used to do - buffered i/o. */ - struct io_state io_state; - - /* The pager we're using to do disk i/o for us. If NULL, a pager hasn't - been allocated yet. Lock the lock in IO_STATE if you want to update - this field. */ - struct pager *pager; - /* The port_bucket for paging ports. */ - struct port_bucket *pager_port_bucket; - - /* The current owner of the open device. For terminals, this affects - controlling terminal behavior (see term_become_ctty). For all objects - this affects old-style async IO. Negative values represent pgrps. This - has nothing to do with the owner of a file (as returned by io_stat, and - as used for various permission checks by filesystems). An owner of 0 - indicates that there is no owner. */ - pid_t owner; -}; - -/* Various bits to be set in the flags field. */ - -/* True if this device should be used in `block' mode, with buffering of - sub-block-size i/o. */ -#define DEV_BUFFERED 0x1 -/* True if this device only supports serial i/o (that is, there's only one - read/write location, which must explicitly be moved to do i/o elsewhere.*/ -#define DEV_SERIAL 0x2 -/* True if we can change the current i/o location of a serial device. */ -#define DEV_SEEKABLE 0x4 -/* True if a device cannot be written on. */ -#define DEV_READONLY 0x8 - -/* Returns TRUE if any of the flags in BITS are set for DEV. */ -#define dev_is(dev, bits) ((dev)->flags & (bits)) - -/* Returns true if it's ok to call dev_write on these arguments, without - first copying BUF to a page-aligned buffer. */ -#define dev_write_valid(dev, buf, len, offs) \ - ((len) <= IO_INBAND_MAX || (buf) % vm_page_size == 0) - -/* Returns a pointer to a new device structure in DEV for the kernel device - NAME, with the given FLAGS. If BLOCK_SIZE is non-zero, it should be the - desired block size, and must be a multiple of the device block size. - If an error occurs, the error code is returned, otherwise 0. */ -error_t dev_open(char *name, int flags, int block_size, struct dev **dev); - -/* Free DEV and any resources it consumes. */ -void dev_close(struct dev *dev); - -/* Reads AMOUNT bytes from DEV and returns it in BUF and BUF_LEN (using the - standard mach out-array convention). *OFFS is incremented to reflect the - amount read/written. Both LEN and *OFFS must be multiples of DEV's block - size. If an error occurs, the error code is returned, otherwise 0. */ -error_t dev_read(struct dev *dev, - vm_address_t *buf, vm_size_t *buf_len, vm_size_t amount, - vm_offset_t *offs); - -/* Writes AMOUNT bytes from the buffer pointed to by BUF to the device DEV. - *OFFS is incremented to reflect the amount read/written. Both AMOUNT and - *OFFS must be multiples of DEV's block size, and either BUF must be - page-aligned, or dev_write_valid() must return true for these arguments. - If an error occurs, the error code is returned, otherwise 0. */ -error_t dev_write(struct dev *dev, - vm_address_t buf, vm_size_t amount, vm_offset_t *offs); - -/* Returns in MEMOBJ the port for a memory object backed by the storage on - DEV. Returns 0 or the error code if an error occurred. */ -error_t dev_get_memory_object(struct dev *dev, memory_object_t *memobj); - -/* Try to stop all paging activity on DEV, returning true if we were - successful. If NOSYNC is true, then we won't write back any (kernel) - cached pages to the device. */ -int dev_stop_paging (struct dev *dev, int nosync); - -/* Try and write out any pending writes to DEV. If WAIT is true, will wait - for any paging activity to cease. */ -error_t dev_sync(struct dev *dev, int wait); - -#ifdef MSG -char *brep(vm_address_t buf, vm_size_t len); -#endif - -#endif /* !__DEV_H__ */ |