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| author | Michael Brown <mcb30@ipxe.org> | 2023-06-29 15:08:23 +0100 |
|---|---|---|
| committer | Michael Brown <mcb30@ipxe.org> | 2023-06-29 15:40:24 +0100 |
| commit | c57887bfc808c2be485ed97f2dc709f927550161 (patch) | |
| tree | 035687938616dfe6fdc22fb9ab4b4c8e717a19ae /src/include | |
| parent | 18af669701b5396af4073b9de4bdb6cd3aff68c1 (diff) | |
| download | ipxe-c57887bfc808c2be485ed97f2dc709f927550161.tar.gz | |
[ioapi] Centralise definitions for dummy PIO
There is no common standard for I/O-space access for non-x86 CPU
families, and non-MMIO peripherals are vanishingly rare.
Generalise the existing ARM definitions for dummy PIO to allow for
reuse by other CPU architectures.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/ipxe/dummy_pio.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/include/ipxe/dummy_pio.h b/src/include/ipxe/dummy_pio.h new file mode 100644 index 000000000..1cdabba14 --- /dev/null +++ b/src/include/ipxe/dummy_pio.h @@ -0,0 +1,64 @@ +#ifndef _IPXE_DUMMY_PIO_H +#define _IPXE_DUMMY_PIO_H + +/** @file + * + * Dummy PIO reads and writes up to 32 bits + * + * There is no common standard for I/O-space access for non-x86 CPU + * families, and non-MMIO peripherals are vanishingly rare. Provide + * dummy implementations that will allow code to link and should cause + * drivers to simply fail to detect hardware at runtime. + */ + +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); + +#define DUMMY_INX( _prefix, _suffix, _type ) \ +static inline __always_inline _type \ +IOAPI_INLINE ( _prefix, in ## _suffix ) ( volatile _type *io_addr __unused) { \ + return ~( (_type) 0 ); \ +} \ +static inline __always_inline void \ +IOAPI_INLINE ( _prefix, ins ## _suffix ) ( volatile _type *io_addr __unused, \ + _type *data, unsigned int count ) {\ + memset ( data, 0xff, count * sizeof ( *data ) ); \ +} + +#define DUMMY_OUTX( _prefix, _suffix, _type ) \ +static inline __always_inline void \ +IOAPI_INLINE ( _prefix, out ## _suffix ) ( _type data __unused, \ + volatile _type *io_addr __unused ){\ + /* Do nothing */ \ +} \ +static inline __always_inline void \ +IOAPI_INLINE ( _prefix, outs ## _suffix ) ( volatile _type *io_addr __unused, \ + const _type *data __unused, \ + unsigned int count __unused ) { \ + /* Do nothing */ \ +} + +#define DUMMY_IODELAY( _prefix ) \ +static inline __always_inline void \ +IOAPI_INLINE ( _prefix, iodelay ) ( void ) { \ + /* Nothing to do */ \ +} + +#define DUMMY_PIO( _prefix ) \ + DUMMY_INX ( _prefix, b, uint8_t ); \ + DUMMY_INX ( _prefix, w, uint16_t ); \ + DUMMY_INX ( _prefix, l, uint32_t ); \ + DUMMY_OUTX ( _prefix, b, uint8_t ); \ + DUMMY_OUTX ( _prefix, w, uint16_t ); \ + DUMMY_OUTX ( _prefix, l, uint32_t ); \ + DUMMY_IODELAY ( _prefix ); + +#define PROVIDE_DUMMY_PIO( _prefix ) \ + PROVIDE_IOAPI_INLINE ( _prefix, inb ); \ + PROVIDE_IOAPI_INLINE ( _prefix, inw ); \ + PROVIDE_IOAPI_INLINE ( _prefix, inl ); \ + PROVIDE_IOAPI_INLINE ( _prefix, outb ); \ + PROVIDE_IOAPI_INLINE ( _prefix, outw ); \ + PROVIDE_IOAPI_INLINE ( _prefix, outl ); \ + PROVIDE_IOAPI_INLINE ( _prefix, iodelay ); + +#endif /* _IPXE_DUMMY_PIO_H */ |