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man pages section 9: DDI and DKI Kernel Functions

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Updated: July 2017



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)