man pages section 9: DDI and DKI Kernel Functions

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Updated: July 2014



ddi_put8, ddi_put16, ddi_put32, ddi_put64, ddi_putb, ddi_putl, ddi_putll, ddi_putw - write data to the mapped memory address, device register or allocated DMA memory address


#include <sys/ddi.h> 
#include <sys/sunddi.h>

void ddi_put8(ddi_acc_handle_t handle, uint8_t *dev_addr, 
     uint8_t value);
void ddi_put16(ddi_acc_handle_t handle, uint16_t *dev_addr, 
     uint16_t value);
void ddi_put32(ddi_acc_handle_t handle, uint32_t *dev_addr, 
     uint32_t value);
void ddi_put64(ddi_acc_handle_t handle, uint64_t *dev_addr, 
     uint64_t value);

Interface Level

Solaris DDI specific (Solaris DDI). The ddi_putb(), ddi_putl(), ddi_putll(), and ddi_putw() functions are obsolete. The ddi_put8() function replaces ddi_putb(). The ddi_put32 () function replaces ddi_putl(). The ddi_put64() function replaces ddi_putll(). The ddi_put16() function replaces ddi_putw().



The data access handle returned from setup calls, such as ddi_regs_map_setup(9F).


The data to be written to the device.


Base device address.


These routines generate a write of various sizes to the mapped memory or device register. The ddi_put8(), ddi_put16(), ddi_put32(), and ddi_put64() functions write 8 bits, 16 bits, 32 bits and 64 bits of data, respectively, to the device address, dev_addr.

Each individual datum will automatically be translated to maintain a consistent view between the host and the device based on the encoded information in the data access handle. The translation may involve byte-swapping if the host and the device have incompatible endian characteristics.

For certain bus types, you can call these DDI functions from a high-interrupt context. These types include ISA and SBus buses. See sysbus (4) and isa (4) for details. For the PCI bus, you can, under certain conditions, call these DDI functions from a high-interrupt context. See pci (4) .


These functions can be called from user, kernel, or interrupt context.


See attributes(5) for descriptions of the following attributes:

Interface Stability
ddi_putb(), ddi_putl(), ddi_putll(), and ddi_putw() are Obsolete
ddi_put8(), ddi_put16(), ddi_put32(), ddi_put64() are Committed

See also

ddi_get8(9F), ddi_regs_map_free(9F), ddi_regs_map_setup(9F), ddi_rep_get8(9F), ddi_rep_put8(9F), ddi_device_acc_attr(9S)