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| author | Michael Brown | 2015-06-29 09:39:58 +0200 |
|---|---|---|
| committer | Michael Brown | 2015-06-29 12:03:05 +0200 |
| commit | 611c9e39dacca965bf9925aaa13f38855b243586 (patch) | |
| tree | 4fa024e0213c70d46a552c5fa30648a6bc5ec793 /src/arch/x86/include/bits | |
| parent | [pxe] Always reconstruct packet for PXENV_GET_CACHED_INFO (diff) | |
| download | ipxe-611c9e39dacca965bf9925aaa13f38855b243586.tar.gz ipxe-611c9e39dacca965bf9925aaa13f38855b243586.tar.xz ipxe-611c9e39dacca965bf9925aaa13f38855b243586.zip | |
[serial] Add general abstraction of a 16550-compatible UART
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/arch/x86/include/bits')
| -rw-r--r-- | src/arch/x86/include/bits/errfile.h | 1 | ||||
| -rw-r--r-- | src/arch/x86/include/bits/uart.h | 41 |
2 files changed, 42 insertions, 0 deletions
diff --git a/src/arch/x86/include/bits/errfile.h b/src/arch/x86/include/bits/errfile.h index d077a450f..0d1617d20 100644 --- a/src/arch/x86/include/bits/errfile.h +++ b/src/arch/x86/include/bits/errfile.h @@ -48,6 +48,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #define ERRFILE_timer_bios ( ERRFILE_ARCH | ERRFILE_DRIVER | 0x00010000 ) #define ERRFILE_hvm ( ERRFILE_ARCH | ERRFILE_DRIVER | 0x00020000 ) #define ERRFILE_hyperv ( ERRFILE_ARCH | ERRFILE_DRIVER | 0x00030000 ) +#define ERRFILE_x86_uart ( ERRFILE_ARCH | ERRFILE_DRIVER | 0x00040000 ) #define ERRFILE_cpuid_cmd ( ERRFILE_ARCH | ERRFILE_OTHER | 0x00000000 ) #define ERRFILE_cpuid_settings ( ERRFILE_ARCH | ERRFILE_OTHER | 0x00010000 ) diff --git a/src/arch/x86/include/bits/uart.h b/src/arch/x86/include/bits/uart.h new file mode 100644 index 000000000..e09cd3f4c --- /dev/null +++ b/src/arch/x86/include/bits/uart.h @@ -0,0 +1,41 @@ +#ifndef _BITS_UART_H +#define _BITS_UART_H + +/** @file + * + * 16550-compatible UART + * + */ + +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); + +#include <stdint.h> +#include <ipxe/io.h> + +/** + * Write to UART register + * + * @v uart UART + * @v addr Register address + * @v data Data + */ +static inline __attribute__ (( always_inline )) void +uart_write ( struct uart *uart, unsigned int addr, uint8_t data ) { + outb ( data, ( uart->base + addr ) ); +} + +/** + * Read from UART register + * + * @v uart UART + * @v addr Register address + * @ret data Data + */ +static inline __attribute__ (( always_inline )) uint8_t +uart_read ( struct uart *uart, unsigned int addr ) { + return inb ( uart->base + addr ); +} + +extern int uart_select ( struct uart *uart, unsigned int port ); + +#endif /* _BITS_UART_H */ |