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