diff options
Diffstat (limited to 'src/include/device/pnp.h')
| -rw-r--r-- | src/include/device/pnp.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/include/device/pnp.h b/src/include/device/pnp.h index d0d6fa36a928..29df77de2093 100644 --- a/src/include/device/pnp.h +++ b/src/include/device/pnp.h @@ -5,6 +5,7 @@ #include <rules.h> #include <device/device.h> #include <device/pnp_def.h> +#include <arch/io.h> #ifndef __SIMPLE_DEVICE__ @@ -63,5 +64,43 @@ struct pnp_mode_ops { void pnp_enter_conf_mode(device_t dev); void pnp_exit_conf_mode(device_t dev); +/* PNP indexed I/O operations */ + +/* + * u8 pnp_read_index(u16 port, u8 reg) + * Description: + * This routine reads indexed I/O registers. The reg byte is written + * to the index register at I/O address = port. The result is then + * read from the data register at I/O address = port + 1. + * + * Parameters: + * @param[in] u16 port = The I/O address of the port index register. + * @param[in] u8 reg = The offset within the indexed space. + * @param[out] u8 result = The value read back from the data register. + */ +static inline u8 pnp_read_index(u16 port, u8 reg) +{ + outb(reg, port); + return inb(port + 1); +} + +/* + * void pnp_write_index(u16 port, u8 reg, u8 value) + * Description: + * This routine writes indexed I/O registers. The reg byte is written + * to the index register at I/O address = port. The value byte is then + * written to the data register at I/O address = port + 1. + * + * Parameters: + * @param[in] u16 port = The address of the port index register. + * @param[in] u8 reg = The offset within the indexed space. + * @param[in] u8 value = The value to be written to the data register. + */ +static inline void pnp_write_index(u16 port, u8 reg, u8 value) +{ + outb(reg, port); + outb(value, port + 1); +} + #endif /* ! __SIMPLE_DEVICE__ */ #endif /* DEVICE_PNP_H */ |