Tribblix: manual page: ddi

DDI_GET8(9F) Kernel Functions for Drivers DDI_GET8(9F)

NAME

ddi_get8, ddi_get16, ddi_get32, ddi_get64, - read data from the
mapped memory address, device register or allocated DMA memory
address

SYNOPSIS

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

uint8_t ddi_get8(ddi_acc_handle_t handle, uint8_t *dev_addr);

uint16_t ddi_get16(ddi_acc_handle_t handle, uint16_t *dev_addr);

uint32_t ddi_get32(ddi_acc_handle_t handle, uint32_t *dev_addr);

uint64_t ddi_get64(ddi_acc_handle_t handle, uint64_t *dev_addr);

INTERFACE LEVEL

illumos DDI specific (illumos DDI). The ddi_getb(), ddi_getl(),
ddi_getll(), and ddi_getw() functions are obsolete. The ddi_get8()
function replaces ddi_getb(). The ddi_get32() function replaces
ddi_getl(). The ddi_get64() function replaces ddi_getll(). The
ddi_get16() function replaces ddi_getw().

PARAMETERS

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

dev_addr
Base device address.

DESCRIPTION

The ddi_get8(), ddi_get16(), ddi_get32(), and ddi_get64() functions
read 8 bits, 16 bits, 32 bits and 64 bits of data, respectively, from
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.

These DDI functions can be called from a high-interrupt context for
the ISA bus and, under certain conditions, for the PCI bus. See
sysbus(5), isa(5) and pci(5) for details.

RETURN VALUES

These functions return the value read from the mapped address.

CONTEXT

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

ATTRIBUTES