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| Kernel Functions for Drivers | ddi_dev_regsize(9F) |
| | ddi_dev_regsize - return the size of a device's register |
SYNOPSIS
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#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dev_regsize(dev_info_t *dip, uint_t rnumber, off_t *resultp); |
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Solaris DDI specific (Solaris DDI).
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dip
- A pointer to the device's dev_info structure.
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rnumber
- The ordinal register number. Device registers are associated with a dev_info and are enumerated in arbitrary
sets from 0 on up. The number of registers a device has can be determined from a call to ddi_dev_nregs(9F).
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resultp
- Pointer to an integer that holds the size, in bytes, of the described register (if it exists).
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ddi_dev_regsize() returns the size, in bytes, of the device register specified by dip and rnumber. This is useful when, for example,
one of the registers is a frame buffer with a varying size known only to its proms.
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ddi_dev_regsize() returns:
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DDI_SUCCESS
- A successful return. The size, in bytes, of the specified
register, is set in resultp.
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DDI_FAILURE
- An invalid (nonexistent) register number was specified.
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ddi_dev_regsize() can be called from user or interrupt context.
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