47 lines
578 B
PHP
47 lines
578 B
PHP
;; File: com.inc
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;;
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;; Usefull links:
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;; - <PC16550D datasheet at https://www.scs.stanford.edu/10wi-cs140/pintos/specs/pc16550d.pdf>
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COM1 = 0x3F8
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COM2 = 0x2F8
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COM3 = 0x3E8
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COM4 = 0x2E8
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UART8250_RBR = 0x0
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UART8250_THR = 0x0
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UART8250_IER = 0x1
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UART8250_IIR = 0x2
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UART8250_FCR = 0x2
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UART8250_LCR = 0x3
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UART8250_MCR = 0x4
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UART8250_LSR = 0x5
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UART8250_MSR = 0x6
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UART8250_SCR = 0x7
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; DLAB = 1
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UART8250_DLL = 0x0
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UART8250_DLH = 0x1
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com_init:
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ret
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com_probe:
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ret
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com_irq1:
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pusha
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popa
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iret
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com_irq2:
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pusha
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popa
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iret
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com_device:
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db 'com', 0, 0, 0, 0, 0
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dd com_init
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