NAME    [Toc]    [Back]

     dense_base, inb, inl, inw, ioperm, map_memory,  outb,  outl,
outw, readb,
     readl,  readw,  unmap_memory, writeb, writel, writew - Alpha
devices I/O
     ports and memory access functions

SYNOPSIS    [Toc]    [Back]

     u_int64_t
     dense_base(void);

     u_int8_t
     inb(u_int32_t port);

     u_int32_t
     inl(u_int32_t port);

     u_int16_t
     inw(u_int32_t port);

     int
     ioperm(unsigned long from, unsigned long num, int on);

     void *
     map_memory(u_int32_t address, u_int32_t size);

     void
     outb(u_int32_t port, u_int8_t val);

     void
     outl(u_int32_t port, u_int32_t val);

     void
     outw(u_int32_t port, u_int16_t val);

     u_int8_t
     readb(void *handle, u_int32_t offset);

     u_int32_t
     readl(void *handle, u_int32_t offset);

     u_int16_t
     readw(void *handle, u_int32_t offset);

     void
     unmap_memory(void *handle, u_int32_t size);

     void
     writeb(void *handle, u_int32_t offset, u_int8_t val);

     void
     writel(void *handle, u_int32_t offset, u_int32_t val);

     void
     writew(void *handle, u_int32_t offset, u_int16_t val);

DESCRIPTION    [Toc]    [Back]

     The functions in libalpha give userland programs  access  to
the I/O ports
     on the OpenBSD/alpha platform.

     The  in*() functions return data read from the specified I/O
port.

     The out*() functions write data to the specified I/O port.

     ioperm() enables access to the specified port numbers if  on
is TRUE and
     disables access if on is FALSE.

     The  map_memory() function allows a user program to map part
of a device
     memory.

     The unmap_memory() function unmaps memory that was previously mapped by
     map_memory().

     The read*() functions read data from device memory previously mapped by
     map_memory().

     The write*() functions write data to the device memory  previously mapped
     by map_memory().

     Note:  Code  using  these  functions  must be compiled using
-lalpha.

HISTORY    [Toc]    [Back]

     These functions originally appeared in FreeBSD.

CAVEATS    [Toc]    [Back]

     Only BWX bus access method is supported  for  now.  Machines
requiring swiz
     type access are not supported.

     Root credentials are needed to use these functions.

OpenBSD      3.6                           July      6,      2002