Viewing file:  xpram.h (2.58 KB) -rw-r--r--
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/*
* xpram.h -- definitions for the char module
*
*********/
#include <linux/ioctl.h>
#include <asm/atomic.h>
#include <linux/major.h>
/* version dependencies have been confined to a separate file */
/*
* Macros to help debugging
*/
#define XPRAM_NAME "xpram" /* name of device/module */
#define XPRAM_DEVICE_NAME_PREFIX "slram" /* Prefix device name for major 35 */
#define XPRAM_DEVS 1 /* one partition */
#define XPRAM_RAHEAD 8 /* no real read ahead */
#define XPRAM_PGSIZE 4096 /* page size of (expanded) mememory pages
* according to S/390 architecture
*/
#define XPRAM_BLKSIZE XPRAM_PGSIZE /* must be equalt to page size ! */
#define XPRAM_HARDSECT XPRAM_PGSIZE /* FIXME -- we have to deal with both
* this hard sect size and in some cases
* hard coded 512 bytes which I call
* soft sects:
*/
#define XPRAM_SOFTSECT 512
#define XPRAM_MAX_DEVS 32 /* maximal number of devices (partitions) */
#define XPRAM_MAX_DEVS1 33 /* maximal number of devices (partitions) +1 */
/* The following macros depend on the sizes above */
#define XPRAM_KB_IN_PG 4 /* 4 kBs per page */
#define XPRAM_KB_IN_PG_ORDER 2 /* 2^? kBs per page */
/* Eventhough XPRAM_HARDSECT is set to 4k some data structures use hard
* coded 512 byte sa sector size
*/
#define XPRAM_SEC2KB(x) ((x >> 1) + (x & 1)) /* modifier used to compute size
in kB from number of sectors */
#define XPRAM_SEC_IN_PG 8 /* 8 sectors per page */
#define XPRAM_SEC_IN_PG_ORDER 3 /* 2^? sectors per page */
#define XPRAM_UNUSED 40 /* unused space between devices,
* in kB, i.e.
* must be a multiple of 4
*/
/*
* The xpram device is removable: if it is left closed for more than
* half a minute, it is removed. Thus use a usage count and a
* kernel timer
*/
typedef struct Xpram_Dev {
int size; /* size in KB not in Byte - RB - */
atomic_t usage;
char * device_name; /* device name prefix in devfs */
devfs_handle_t devfs_entry; /* handle needed to unregister dev from devfs */
u8 *data;
} Xpram_Dev;
/* 2.2: void xpram_setup (char *, int *); */
/* begin 2.3 */
int xpram_setup (char *);
/* end 2.3 */
int xpram_init(void);
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