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><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="PCI-LIBRARY-REFERENCE">PCI Library reference</H1
><P
>This document defines the PCI Support Library for eCos.</P
><P
>The PCI support library provides a set of routines for accessing
the PCI bus configuration space in a portable manner. This is provided
by two APIs. The high level API is used by device drivers, or other
code, to access the PCI configuration space portably. The low level
API is used by the PCI library itself to access the hardware in
a platform-specific manner, and may also be used by device drivers
to access the PCI configuration space directly.</P
><P
>Underlying the low-level API is HAL support for the basic
configuration space operations. These should not generally be used
by any code other than the PCI library, and are present in the HAL
to allow low level initialization of the PCI bus and devices to
take place if necessary.</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN12801">PCI Library API</H2
><P
>The PCI library provides the following routines and types
for accessing the PCI configuration space.</P
><P
>The API for the PCI library is found in the header file
<TT
CLASS="FILENAME"
><cyg/io/pci.h></TT
>.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN12806">Definitions</H2
><P
>The header file contains definitions for the common configuration
structure offsets and specimen values for device, vendor and class
code.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN12809">Types and data structures</H2
><P
>The following types are defined:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>typedef CYG_WORD32 cyg_pci_device_id;</PRE
></TD
></TR
></TABLE
><P
>This is comprised of the bus number, device number and functional
unit numbers packed into a single word. The macro <TT
CLASS="FUNCTION"
>CYG_PCI_DEV_MAKE_ID()</TT
>, in conjunction with the <TT
CLASS="FUNCTION"
>CYG_PCI_DEV_MAKE_DEVFN()</TT
>
macro, may be used to construct a device id from the bus, device and functional
unit numbers. Similarly the macros <TT
CLASS="FUNCTION"
>CYG_PCI_DEV_GET_BUS()</TT
>,
<TT
CLASS="FUNCTION"
>CYG_PCI_DEV_GET_DEVFN()</TT
>,
<TT
CLASS="FUNCTION"
>CYG_PCI_DEV_GET_DEV()</TT
>, and
<TT
CLASS="FUNCTION"
>CYG_PCI_DEV_GET_FN()</TT
> may be used to extract the
constituent parts of a device id. It should not be necessary to use these
macros under normal circumstances. The following code fragment demonstrates
how these macros may be used:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> // Create a packed representation of device 1, function 0
cyg_uint8 devfn = CYG_PCI_DEV_MAKE_DEVFN(1,0);
// Create a packed devid for that device on bus 2
cyg_pci_device_id devid = CYG_PCI_DEV_MAKE_ID(2, devfn);
diag_printf("bus %d, dev %d, func %d\n",
CYG_PCI_DEV_GET_BUS(devid),
CYG_PCI_DEV_GET_DEV(CYG_PCI_DEV_GET_DEVFN(devid)),
CYG_PCI_DEV_GET_FN(CYG_PCI_DEV_GET_DEVFN(devid));</PRE
></TD
></TR
></TABLE
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>typedef struct cyg_pci_device;</PRE
></TD
></TR
></TABLE
><P
>This structure is used to contain data read from a PCI device's
configuration header by <TT
CLASS="FUNCTION"
>cyg_pci_get_device_info()</TT
>.
It is also used to record the resource allocations made to the device.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>typedef CYG_WORD64 CYG_PCI_ADDRESS64;
typedef CYG_WORD32 CYG_PCI_ADDRESS32;</PRE
></TD
></TR
></TABLE
><P
>Pointers in the PCI address space are 32 bit (IO space) or
32/64 bit (memory space). In most platform and device configurations
all of PCI memory will be linearly addressable using only 32 bit
pointers as read from <TT
CLASS="VARNAME"
>base_map[]</TT
>.</P
><P
>The 64 bit type is used to allow handling 64 bit devices in
the future, should it be necessary, without changing the library's
API.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN12828">Functions</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_pci_init(void);</PRE
></TD
></TR
></TABLE
><P
>Initialize the PCI library and establish contact with the
hardware. This function is idempotent and can be called either by
all drivers in the system, or just from an application initialization
function.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool cyg_pci_find_device( cyg_uint16 vendor,
cyg_uint16 device,
cyg_pci_device_id *devid );</PRE
></TD
></TR
></TABLE
><P
>Searches the PCI bus configuration space for a device with
the given <TT
CLASS="PARAMETER"
><I
>vendor</I
></TT
> and <TT
CLASS="PARAMETER"
><I
>device</I
></TT
>
ids. The search starts at the device pointed to by <TT
CLASS="PARAMETER"
><I
>devid</I
></TT
>,
or at the first slot if it contains <TT
CLASS="LITERAL"
>CYG_PCI_NULL_DEVID</TT
>.
<TT
CLASS="PARAMETER"
><I
>*devid</I
></TT
> will be updated with the ID of the next device
found. Returns <TT
CLASS="CONSTANT"
>true</TT
> if one is found and <TT
CLASS="CONSTANT"
>false</TT
> if not.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool cyg_pci_find_class( cyg_uint32 dev_class,
cyg_pci_device_id *devid );</PRE
></TD
></TR
></TABLE
><P
>Searches the PCI bus configuration space for a device with
the given <TT
CLASS="PARAMETER"
><I
>dev_class</I
></TT
> class code. The search starts at the
device pointed to by <TT
CLASS="PARAMETER"
><I
>devid</I
></TT
>, or at the first slot if it
contains <TT
CLASS="LITERAL"
>CYG_PCI_NULL_DEVID</TT
>.</P
><P
><TT
CLASS="PARAMETER"
><I
>*devid</I
></TT
> will be updated with the ID of the next
device found. Returns <TT
CLASS="CONSTANT"
>true</TT
> if one is found and
<TT
CLASS="CONSTANT"
>false</TT
> if not.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool cyg_pci_find_next( cyg_pci_device_id cur_devid,
cyg_pci_device_id *next_devid );</PRE
></TD
></TR
></TABLE
><P
>Searches the PCI configuration space for the next valid device
after <TT
CLASS="PARAMETER"
><I
>cur_devid</I
></TT
>. If <TT
CLASS="PARAMETER"
><I
>cur_devid</I
></TT
>
is given the value <TT
CLASS="LITERAL"
>CYG_PCI_NULL_DEVID</TT
>, then the search starts
at the first slot. It is permitted for <TT
CLASS="PARAMETER"
><I
>next_devid</I
></TT
> to
point to <TT
CLASS="PARAMETER"
><I
>cur_devid</I
></TT
>. Returns <TT
CLASS="CONSTANT"
>true</TT
>
if another device is found and <TT
CLASS="CONSTANT"
>false</TT
> if not.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool cyg_pci_find_matching( cyg_pci_match_func *matchp,
void * match_callback_data,
cyg_pci_device_id *devid );</PRE
></TD
></TR
></TABLE
><P
>Searches the PCI bus configuration space for a device whose properties
match those required by the caller supplied <TT
CLASS="PARAMETER"
><I
>cyg_pci_match_func</I
></TT
>.
The search starts at the device pointed to by <TT
CLASS="PARAMETER"
><I
>devid</I
></TT
>, or
at the first slot if it contains <TT
CLASS="CONSTANT"
>CYG_PCI_NULL_DEVID</TT
>. The
<TT
CLASS="PARAMETER"
><I
>devid</I
></TT
> will be updated with the ID of the next device found.
This function returns <TT
CLASS="CONSTANT"
>true</TT
> if a matching device is found
and <TT
CLASS="CONSTANT"
>false</TT
> if not.</P
><P
>The match_func has a type declared as:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>typedef cyg_bool (cyg_pci_match_func)( cyg_uint16 vendor,
cyg_uint16 device,
cyg_uint32 class,
void * user_data);</PRE
></TD
></TR
></TABLE
><P
>The <TT
CLASS="PARAMETER"
><I
>vendor</I
></TT
>, <TT
CLASS="PARAMETER"
><I
>device</I
></TT
>, and
<TT
CLASS="PARAMETER"
><I
>class</I
></TT
> are from the device configuration space. The
<TT
CLASS="PARAMETER"
><I
>user_data</I
></TT
> is the callback data passed to <TT
CLASS="FUNCTION"
>cyg_pci_find_matching</TT
>.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_pci_get_device_info ( cyg_pci_device_id devid,
cyg_pci_device *dev_info );</PRE
></TD
></TR
></TABLE
><P
>This function gets the PCI configuration information for the
device indicated in <TT
CLASS="PARAMETER"
><I
>devid</I
></TT
>. The common fields of the
<SPAN
CLASS="STRUCTNAME"
>cyg_pci_device</SPAN
> structure, and the appropriate fields
of the relevant header union member are filled in from the device's
configuration space.
If the device has not been enabled, then this function will also fetch
the size and type information from the base address registers and
place it in the <TT
CLASS="VARNAME"
>base_size[]</TT
> array.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_pci_set_device_info ( cyg_pci_device_id devid,
cyg_pci_device *dev_info );</PRE
></TD
></TR
></TABLE
><P
>This function sets the PCI configuration information for the
device indicated in <TT
CLASS="PARAMETER"
><I
>devid</I
></TT
>. Only the configuration space
registers that are writable are actually written. Once all the fields have
been written, the device info will be read back into <TT
CLASS="PARAMETER"
><I
>*dev_info</I
></TT
>, so that it reflects the true state of the hardware.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_pci_read_config_uint8( cyg_pci_device_id devid,
cyg_uint8 offset, cyg_uint8 *val );
void cyg_pci_read_config_uint16( cyg_pci_device_id devid,
cyg_uint8 offset, cyg_uint16 *val );
void cyg_pci_read_config_uint32( cyg_pci_device_id devid,
cyg_uint8 offset, cyg_uint32 *val );</PRE
></TD
></TR
></TABLE
><P
>These functions read registers of the appropriate size from
the configuration space of the given device. They should mainly
be used to access registers that are device specific. General PCI
registers are best accessed through <TT
CLASS="FUNCTION"
>cyg_pci_get_device_info()</TT
>.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_pci_write_config_uint8( cyg_pci_device_id devid,
cyg_uint8 offset, cyg_uint8 val );
void cyg_pci_write_config_uint16( cyg_pci_device_id devid,
cyg_uint8 offset, cyg_uint16 val );
void cyg_pci_write_config_uint32( cyg_pci_device_id devid,
cyg_uint8 offset, cyg_uint32 val );</PRE
></TD
></TR
></TABLE
><P
>These functions write registers of the appropriate size to
the configuration space of the given device. They should mainly
be used to access registers that are device specific. General PCI
registers are best accessed through <TT
CLASS="FUNCTION"
>cyg_pci_get_device_info()</TT
>. Writing the general registers this way may render the contents of
a <SPAN
CLASS="STRUCTNAME"
>cyg_pci_device</SPAN
> structure invalid.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN12891">Resource allocation</H2
><P
>These routines allocate memory and I/O space to PCI devices.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool cyg_pci_configure_device( cyg_pci_device *dev_info )</PRE
></TD
></TR
></TABLE
><P
>Allocate memory and IO space to all base address registers
using the current memory and IO base addresses in the library. The
allocated base addresses, translated into directly usable values,
will be put into the matching <TT
CLASS="VARNAME"
>base_map[]</TT
> entries
in <TT
CLASS="PARAMETER"
><I
>*dev_info</I
></TT
>. If <TT
CLASS="PARAMETER"
><I
>*dev_info</I
></TT
> does
not contain valid <TT
CLASS="VARNAME"
>base_size[]</TT
> entries, then the result is
<TT
CLASS="CONSTANT"
>false</TT
>. This function will also call <TT
CLASS="FUNCTION"
>cyg_pci_translate_interrupt()</TT
> to put the interrupt vector into the
HAL vector entry.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool cyg_pci_configure_bus( cyg_uint8 bus, cyg_uint8 *next_bus )</PRE
></TD
></TR
></TABLE
><P
>Allocate memory and IO space to all base address registers on all devices
on the given bus and all subordinate busses. If a PCI-PCI bridge is found on
<TT
CLASS="PARAMETER"
><I
>bus</I
></TT
>, this function will call itself recursively in order
to configure the bus on the other side of the bridge. Because of the nature of
bridge devices, all devices on the secondary side of a bridge must be allocated
memory and IO space before the memory and IO windows on the bridge device can be
properly configured. The <TT
CLASS="PARAMETER"
><I
>next_bus</I
></TT
> argument points to the
bus number to assign to the next subordinate bus found. The number will be
incremented as new busses are discovered. If successful, <TT
CLASS="CONSTANT"
>true</TT
>
is returned. Otherwise, <TT
CLASS="CONSTANT"
>false</TT
> is returned.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool cyg_pci_translate_interrupt( cyg_pci_device *dev_info,
CYG_ADDRWORD *vec );</PRE
></TD
></TR
></TABLE
><P
>Translate the device's PCI interrupt (INTA#-INTD#)
to the associated HAL vector. This may also depend on which slot
the device occupies. If the device may generate interrupts, the
translated vector number will be stored in <TT
CLASS="PARAMETER"
><I
>vec</I
></TT
> and the
result is <TT
CLASS="CONSTANT"
>true</TT
>. Otherwise the result is <TT
CLASS="CONSTANT"
>false</TT
>.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool cyg_pci_allocate_memory( cyg_pci_device *dev_info,
cyg_uint32 bar,
CYG_PCI_ADDRESS64 *base );
cyg_bool cyg_pci_allocate_io( cyg_pci_device *dev_info,
cyg_uint32 bar,
CYG_PCI_ADDRESS32 *base );</PRE
></TD
></TR
></TABLE
><P
>These routines allocate memory or I/O space to the base address
register indicated by <TT
CLASS="PARAMETER"
><I
>bar</I
></TT
>. The base address in
<TT
CLASS="PARAMETER"
><I
>*base</I
></TT
> will be correctly aligned and the address of the
next free location will be written back into it if the allocation succeeds. If
the base address register is of the wrong type for this allocation, or
<TT
CLASS="PARAMETER"
><I
>dev_info</I
></TT
> does not contain valid <TT
CLASS="VARNAME"
>base_size[]</TT
> entries, the result is <TT
CLASS="CONSTANT"
>false</TT
>. These functions
allow a device driver to set up its own mappings if it wants. Most devices
should probably use <TT
CLASS="FUNCTION"
>cyg_pci_configure_device()</TT
>.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_pci_set_memory_base( CYG_PCI_ADDRESS64 base );
void cyg_pci_set_io_base( CYG_PCI_ADDRESS32 base );</PRE
></TD
></TR
></TABLE
><P
>These routines set the base addresses for memory and I/O mappings
to be used by the memory allocation routines. Normally these base
addresses will be set to default values based on the platform. These
routines allow these to be changed by application code if necessary.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN12923">PCI Library Hardware API</H2
><P
>This API is used by the PCI library to access the PCI bus
configuration space. Although it should not normally be necessary,
this API may also be used by device driver or application code to
perform PCI bus operations not supported by the PCI library.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_pcihw_init(void);</PRE
></TD
></TR
></TABLE
><P
>Initialize the PCI hardware so that the configuration space
may be accessed.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_pcihw_read_config_uint8( cyg_uint8 bus,
cyg_uint8 devfn, cyg_uint8 offset, cyg_uint8 *val);
void cyg_pcihw_read_config_uint16( cyg_uint8 bus,
cyg_uint8 devfn, cyg_uint8 offset, cyg_uint16 *val);
void cyg_pcihw_read_config_uint32( cyg_uint8 bus,
cyg_uint8 devfn, cyg_uint8 offset, cyg_uint32 *val);</PRE
></TD
></TR
></TABLE
><P
>These functions read a register of the appropriate size from
the PCI configuration space at an address composed from the <TT
CLASS="PARAMETER"
><I
>bus</I
></TT
>, <TT
CLASS="PARAMETER"
><I
>devfn</I
></TT
> and <TT
CLASS="PARAMETER"
><I
>offset</I
></TT
>
arguments.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_pcihw_write_config_uint8( cyg_uint8 bus,
cyg_uint8 devfn, cyg_uint8 offset, cyg_uint8 val);
void cyg_pcihw_write_config_uint16( cyg_uint8 bus,
cyg_uint8 devfn, cyg_uint8 offset, cyg_uint16 val);
void cyg_pcihw_write_config_uint32( cyg_uint8 bus,
cyg_uint8 devfn, cyg_uint8 offset, cyg_uint32 val);</PRE
></TD
></TR
></TABLE
><P
>These functions write a register of the appropriate size to
the PCI configuration space at an address composed from the
<TT
CLASS="PARAMETER"
><I
>bus</I
></TT
>, <TT
CLASS="PARAMETER"
><I
>devfn</I
></TT
> and
<TT
CLASS="PARAMETER"
><I
>offset</I
></TT
> arguments.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool cyg_pcihw_translate_interrupt( cyg_uint8 bus,
cyg_uint8 devfn,
CYG_ADDRWORD *vec);</PRE
></TD
></TR
></TABLE
><P
>This function interrogates the device and determines which
HAL interrupt vector it is connected to.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN12940">HAL PCI support</H2
><P
>HAL support consists of a set of C macros that provide the
implementation of the low level PCI API.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>HAL_PCI_INIT()</PRE
></TD
></TR
></TABLE
><P
>Initialize the PCI bus.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>HAL_PCI_READ_UINT8( bus, devfn, offset, val )
HAL_PCI_READ_UINT16( bus, devfn, offset, val )
HAL_PCI_READ_UINT32( bus, devfn, offset, val )</PRE
></TD
></TR
></TABLE
><P
>Read a value from the PCI configuration space of the appropriate
size at an address composed from the <TT
CLASS="PARAMETER"
><I
>bus</I
></TT
>, <TT
CLASS="PARAMETER"
><I
>devfn</I
></TT
> and <TT
CLASS="PARAMETER"
><I
>offset</I
></TT
>.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>HAL_PCI_WRITE_UINT8( bus, devfn, offset, val )
HAL_PCI_WRITE_UINT16( bus, devfn, offset, val )
HAL_PCI_WRITE_UINT32( bus, devfn, offset, val )</PRE
></TD
></TR
></TABLE
><P
>Write a value to the PCI configuration space of the appropriate
size at an address composed from the <TT
CLASS="PARAMETER"
><I
>bus</I
></TT
>, <TT
CLASS="PARAMETER"
><I
>devfn</I
></TT
> and <TT
CLASS="PARAMETER"
><I
>offset</I
></TT
>.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>HAL_PCI_TRANSLATE_INTERRUPT( bus, devfn, *vec, valid )</PRE
></TD
></TR
></TABLE
><P
>Translate the device's interrupt line into a HAL
interrupt vector.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>HAL_PCI_ALLOC_BASE_MEMORY
HAL_PCI_ALLOC_BASE_IO</PRE
></TD
></TR
></TABLE
><P
>These macros define the default base addresses used to initialize
the memory and I/O allocation pointers.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>HAL_PCI_PHYSICAL_MEMORY_BASE
HAL_PCI_PHYSICAL_IO_BASE</PRE
></TD
></TR
></TABLE
><P
>PCI memory and IO range do not always correspond directly
to physical memory or IO addresses. Frequently the PCI address spaces
are windowed into the processor's address range at some
offset. These macros define offsets to be added to the PCI base
addresses to translate PCI bus addresses into physical memory addresses
that can be used to access the allocated memory or IO space.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>The chunk of PCI memory space directly addressable though
the window by the CPU may be smaller than the amount of PCI memory
actually provided. In that case drivers will have to access PCI
memory space in segments. Doing this will be platform specific and
is currently beyond the scope of the HAL.</P
></BLOCKQUOTE
></DIV
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>HAL_PCI_IGNORE_DEVICE( bus, dev, fn )</PRE
></TD
></TR
></TABLE
><P
>This macro, if defined, may be used to limit the devices which are
found by the bus scanning functions. This is sometimes necessary for
devices which need special handling. If this macro evaluates to <TT
CLASS="CONSTANT"
>true</TT
>, the given device will not be found by <TT
CLASS="FUNCTION"
>cyg_pci_find_next</TT
> or other bus scanning functions.</P
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