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...
#define OFF_DO_CTXMGT 0x40000000
#define OFF_NORMAL 0x40100000
#define CTXMGT_SIZE 0x100000
#define NORMAL_SIZE 0x100000
/*
* Driver devmap_contextmgt(9E) callback function.
*/
static int
xx_context_mgt(devmap_cookie_t dhp, void *pvtp, offset_t offset,
size_t length, uint_t type, uint_t rw)
{
......
/*
* see devmap_contextmgt(9E) for an example
*/
}
/*
* Driver devmap_access(9E) entry point
*/
static int
xxdevmap_access(devmap_cookie_t dhp, void *pvtp, offset_t off,
size_t len, uint_t type, uint_t rw)
{
offset_t diff;
int err;
/*
* check if off is within the range that supports
* context management.
*/
if ((diff = off - OFF_DO_CTXMG) >= 0 && diff < CTXMGT_SIZE) {
/*
* calculates the length for context switching
*/
if ((len + off) > (OFF_DO_CTXMGT + CTXMGT_SIZE))
return (-1);
/*
* perform context switching
*/
err = devmap_do_ctxmgt(dhp, pvtp, off, len, type,
rw, xx_context_mgt);
/*
* check if off is within the range that does normal
* memory mapping.
*/
} else if ((diff = off - OFF_NORMAL) >= 0 && diff < NORMAL_SIZE) {
if ((len + off) > (OFF_NORMAL + NORMAL_SIZE))
return (-1);
err = devmap_default_access(dhp, pvtp, off, len, type, rw);
} else
return (-1);
return (err);
}
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