mirror of
https://github.com/Zeal-Operating-System/ZealOS.git
synced 2024-12-29 00:36:32 +00:00
132 lines
2.7 KiB
HolyC
Executable file
132 lines
2.7 KiB
HolyC
Executable file
/* RS232 serial ports no longer exist.
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Be sure to Zenith Include this by placing
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it in your start-up scripts.
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*/
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#help_index "Comm"
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#define UART_THR 0
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#define UART_RDR 0
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#define UART_BRDL 0
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#define UART_IER 1
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#define UART_BRDH 1
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#define UART_IIR 2
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#define UART_LCR 3
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#define UART_MCR 4
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#define UART_LSR 5
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#define UART_MSR 6
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#define COMf_ENABLED 0
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class CComm
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{
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I64 base,
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flags;
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CFifoU8 *RX_fifo;
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CFifoU8 *TX_fifo;
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} comm_ports[5];
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U0 CommHandler(I64 port)
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{
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CComm *c=&comm_ports[port];
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I64 b=0,stat;
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if (Bt(&c->flags,COMf_ENABLED)) {
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stat=InU8(c->base+UART_IIR);
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if (stat & 4) //RX
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FifoU8Insert(c->RX_fifo,InU8(c->base+UART_RDR));
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if (stat & 2) { //TX
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if (FifoU8Remove(c->TX_fifo,&b))
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OutU8(c->base+UART_THR,b);
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else
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OutU8(c->base+UART_IER,1); //RX but no THR empty
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}
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}
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}
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interrupt U0 IRQComm3()
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{
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CommHandler(2);
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CommHandler(4);
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OutU8(PIC_1,PIC_EOI);
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}
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interrupt U0 IRQComm4()
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{
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CommHandler(1);
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CommHandler(3);
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OutU8(PIC_1,PIC_EOI);
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}
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U0 CommInit()
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{
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MemSet(&comm_ports,0,sizeof(comm_ports));
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comm_ports[1].base=0x3F8;
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comm_ports[2].base=0x2F8;
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comm_ports[3].base=0x3E8;
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comm_ports[4].base=0x2E8;
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IntEntrySet(0x23,&IRQComm3);
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IntEntrySet(0x24,&IRQComm4);
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}
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CommInit;
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public CComm *CommInit8n1(I64 port,I64 baud)
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{
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CComm *c=&comm_ports[port];
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PUSHFD
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CLI
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if (LBts(&c->flags,COMf_ENABLED)) {
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FifoU8Del(c->RX_fifo);
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FifoU8Del(c->TX_fifo);
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}
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c->RX_fifo=FifoU8New(256);
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c->TX_fifo=FifoU8New(256);
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OutU8(c->base+UART_LCR,0); //Set for IER
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OutU8(c->base+UART_IER,0); //Disable all IRQ
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OutU8(c->base+UART_LCR,0x80); //Enable baud rate control
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OutU8(c->base+UART_BRDL,(0x180/(baud/300)) & 0xFF); //LSB
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OutU8(c->base+UART_BRDH,(0x180/(baud/300)) / 256); //MSB
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OutU8(c->base+UART_LCR,3); //8-none-1
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InU8(c->base+UART_RDR); //read garbage
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InU8(c->base+UART_LSR);
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OutU8(c->base+UART_MCR,4);
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OutU8(c->base+UART_IER,0); //Disable all IRQ
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OutU8(c->base+UART_MCR,0xA); //out2 and rts
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OutU8(PIC_1_DATA,InU8(PIC_1_DATA) & (0xFF-0x18));//Enable 8259 IRQ 3 & 4
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OutU8(c->base+UART_IER,1); //RX but no THR empty
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POPFD
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return c;
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}
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public U0 CommPutChar(I64 port,U8 b)
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{
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CComm *c=&comm_ports[port];
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PUSHFD
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CLI
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FifoU8Insert(c->TX_fifo,b);
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OutU8(c->base+UART_IER,3); //RX and THR empty
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POPFD
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Sleep(10); //!!! Remove this line!!! Linux echo_socket is too slow.
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}
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U0 CommPutS(I64 port,U8 *st)
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{
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I64 b;
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while (b=*st++)
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CommPutChar(port,b);
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}
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public U0 CommPutBlk(I64 port,U8 *buf,I64 count)
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{
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while (count--)
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CommPutChar(port,*buf++);
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}
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public U0 CommPrint(I64 port,U8 *format,...)
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{
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U8 *buf=StrPrintJoin(NULL,format,argc,argv);
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CommPutS(port,buf);
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Free(buf);
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}
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