MSOP_IO(D2psm)

MSOP_IO: MSOP_IO_READ8, MSOP_IO_READ16, MSOP_IO_READ32, MSOP_IO_WRITE8, MSOP_IO_WRITE16, MSOP_IO_WRITE32, MSOP_IO_REP_READ8, MSOP_IO_REP_READ16, MSOP_IO_REP_READ32, MSOP_IO_REP_WRITE8, MSOP_IO_REP_WRITE16, MSOP_IO_REP_WRITE32 -- access non-memory-mapped I/O namespace

Synopsis

   unsigned char pfxio_read8(ms_port_t port)
   unsigned short pfxio_read16(ms_port_t port)
   unsigned int pfxio_read32(ms_port_t port)
   void pfxio_write8(ms_port_t port,
                      unsigned char val)
   void pfxio_write16(ms_port_t port,
                       unsigned short val)
   void pfxio_write32(ms_port_t port,
                       unsigned int val)
   void pfxio_rep_read8(ms_port_t port,
                         unsigned char *datap, int count)
   void pfxio_rep_read16(ms_port_t port,
                          unsigned short *datap, int count)
   void pfxio_rep_read32(ms_port_t port,
                          unsigned int *datap, int count)
   void pfxio_rep_write8(ms_port_t port,
                         unsigned char *datap, int count)
   void pfxio_rep_write16(ms_port_t port,
                          unsigned short *datap, int count)
   void pfxio_rep_write32(ms_port_t port,
                          unsigned int *datap, int count)

Description

MSOP_IO operations access I/O space on architectures that have non-memory-mapped I/O register namespace. The definition of ms_port_t will be constant across all platforms that use the same processor. See Intro(D4psm) for details. On IA-32 architectures, these operations correspond to the various flavors of the IA-32 in and out instructions.

Arguments

port: the port address
val: the data to write to the port
datap: pointer to the data buffer
count: number of data items in the buffer

Return values

The MSOP_IO_READ* MSOPs return the data read from the I/O port.

The remaining MSOPs do not return anything.

Usage

Hardware applicability

Platforms that do not support IA-32 in and out instructions.

Version applicability

psm: 2