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55 lines
2.0 KiB
55 lines
2.0 KiB
#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_UART_H_ |
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#define COSMOPOLITAN_LIBC_NEXGEN32E_UART_H_ |
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/** |
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* @fileoverview PC Serial Line Helpers (8250 UART 16550+). |
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* |
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* <p>These functions provide the baseline of PC telecommunications |
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* support that doesn't require switching context or cpu mode. |
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* |
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* <p>Example use cases: |
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* <ul> |
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* <li>Qemu stdio |
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* <li>Bare metal stdio |
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* <li>FIPS-170-2 SSH alternative |
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* <li>NIC for key-signing servers |
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* </ul> |
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* |
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* @see www.lammertbies.nl/comm/info/serial-uart.html |
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*/ |
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#define COM1 0x0 /* offset in pc bios data area with port number (0x400) */ |
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#define COM2 0x2 |
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#define COM3 0x4 |
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#define COM4 0x6 |
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#define IRQ3 0x0b /* com2 interrupt number (irq3) */ |
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#define IRQ4 0x0c /* com1 interrupt number (irq4) */ |
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#define UART_DLAB (1 << 7) /* serial line conf mode bit */ |
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#define UART_DLL 0 /* divisor latch register */ |
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#define UART_DLM 1 /* divisor latch register */ |
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#define UART_IIR 2 /* interrupt identification register */ |
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#define UART_LCR 3 /* line control register */ |
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#define UART_MCR 4 /* modem control register */ |
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#define UART_LSR 5 /* line status register */ |
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#define UART_TTYDA (1 << 0) /* data available (rx ready) */ |
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#define UART_TTYOE (1 << 1) /* overrun error */ |
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#define UART_TTYPE (1 << 2) /* parity error */ |
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#define UART_TTYFE (1 << 3) /* framing error */ |
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#define UART_TTYBSR (1 << 4) /* break signal received */ |
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#define UART_TTYTXR (1 << 5) /* serial thr empty (tx ready) */ |
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#define UART_TTYIDL (1 << 6) /* serial thr empty and line idle */ |
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#define UART_TTYEDF (1 << 7) /* erroneous data in fifo */ |
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#if !(__ASSEMBLER__ + __LINKER__ + 0) |
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COSMOPOLITAN_C_START_ |
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void sinit(unsigned short *ports, unsigned count, const char *config); |
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void sputc(unsigned char ch, int port); |
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int sgetc(int port); |
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void sputs(const char *s, int port); |
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void sflush(unsigned short *ports, unsigned count); |
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unsigned char slsr(int port); |
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COSMOPOLITAN_C_END_ |
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */ |
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#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_UART_H_ */
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