ref: 15d1425b276495a82621a8d075176a59a512cdf3
dir: /sys/src/9/sgi/uartarcs.c/
/* * ARCS console. */ #include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "../port/error.h" #include "io.h" extern PhysUart arcsphysuart; static Uart arcsuart = { .name = "arcs", .freq = 1843200, .phys = &arcsphysuart, }; static Lock arcslock; void arcsputc(char c) { int r; r = 0; ilock(&arcslock); arcs(0x6c, 1, &c, 1, &r); iunlock(&arcslock); } int arcsgetc(void) { int c, r; uchar b; r = 0; c = -1; ilock(&arcslock); if(arcs(0x68, 0) == 0) if(arcs(0x64, 0, &b, 1, &r) == 0) if(r == 1) c = b; iunlock(&arcslock); return c; } void arcsproc(void*) { int c; while(waserror()) ; for(;;){ tsleep(&up->sleep, return0, nil, 50); c = arcsgetc(); if(c < 0) continue; uartrecv(&arcsuart, c); } } /* * Send queued output to console */ static void kick(Uart *uart) { int n; for(n=0; uart->op < uart->oe || uartstageoutput(uart) > 0; uart->op += n){ n = uart->oe - uart->op; if(n <= 0 || !canlock(&arcslock)) break; if(arcs(0x6c, 1, uart->op, n, &n) != 0) n = -1; unlock(&arcslock); if(n <= 0) break; } } static void interrupt(Ureg*, void *) { } static Uart* pnp(void) { return &arcsuart; } static void enable(Uart*, int) { } static void disable(Uart*) { } static void donothing(Uart*, int) { } static int donothingint(Uart*, int) { return 0; } static int baud(Uart *uart, int n) { if(n <= 0) return -1; uart->baud = n; return 0; } static int bits(Uart *uart, int n) { switch(n){ case 7: case 8: break; default: return -1; } uart->bits = n; return 0; } static int stop(Uart *uart, int n) { if(n != 1) return -1; uart->stop = n; return 0; } static int parity(Uart *uart, int n) { if(n != 'n') return -1; uart->parity = n; return 0; } static long status(Uart *, void *, long, long) { return 0; } void uartarcsputc(Uart*, int c) { arcsputc(c); } int uartarcsgetc(Uart*) { return arcsgetc(); } PhysUart arcsphysuart = { .name = "arcsuart", .pnp = pnp, .enable = enable, .disable = disable, .kick = kick, .dobreak = donothing, .baud = baud, .bits = bits, .stop = stop, .parity = parity, .modemctl = donothing, .rts = donothing, .dtr = donothing, .status = status, .fifo = donothing, .getc = uartarcsgetc, .putc = uartarcsputc, }; void arcsconsinit(void) { consuart = &arcsuart; consuart->console = 1; }