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src/arch/x86/include/bits/ns16550.h
60 строк
1 KB
Michael Brown
[uart] Support 16550 UARTs accessed via either MMIO or port I/O
05 ноя 2025, 00:14
05 ноя 2025, 00:14
a786c8d
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#ifndef _BITS_NS16550_H #define _BITS_NS16550_H /** @file * * 16550-compatible UART * */ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include <stdint.h> #include <ipxe/io.h> /** * Write to UART register * * @v ns16550 16550 UART * @v address Register address * @v data Data */ static inline __attribute__ (( always_inline )) void ns16550_write ( struct ns16550_uart *ns16550, unsigned int address, uint8_t data ) { iowrite8 ( data, ( ns16550->base + address ) ); } /** * Read from UART register * * @v ns16550 16550 UART * @v address Register address * @ret data Data */ static inline __attribute__ (( always_inline )) uint8_t ns16550_read ( struct ns16550_uart *ns16550, unsigned int address ) { return ioread8 ( ns16550->base + address ); } /* Fixed ISA serial port base addresses */ #define COM1_BASE 0x3f8 #define COM2_BASE 0x2f8 #define COM3_BASE 0x3e8 #define COM4_BASE 0x2e8 /* Fixed ISA serial ports */ extern struct uart com1; extern struct uart com2; extern struct uart com3; extern struct uart com4; /* Fixed ISA serial port names */ #define COM1 &com1 #define COM2 &com2 #define COM3 &com3 #define COM4 &com4 #endif /* _BITS_NS16550_H */