9os

Experimental kernel using plan9 ideas for embedded device
git clone git://git.simple-cc.org/9os
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pi3.c (439B)

      1 #include <os9/os9.h>
      2 
      3 #include <string.h>
      4 
      5 #include "arch.h"
      6 
      7 static uint32_t *early = (uint32_t *) 0x3F201000;
      8 
      9 Mach mach = {
     10 	.phystack = 0x80000,
     11 	.phytext = 0x80000,
     12 	.kzero = 0xFFFFFF0000000000 - 0x80000,
     13 };
     14 
     15 void
     16 putch(int c)
     17 {
     18 	char ch;
     19 
     20 	if (console) {
     21 		ch = c;
     22 		chanwrite(console, &ch, 1);
     23 	} else {
     24 		if (c == '\n')
     25 			putch('\r');
     26 		while (inm32(early+6) & 1<<5)
     27 			;
     28 		outm32(c, early);
     29 	}
     30 
     31 	barrier(DATA);
     32 	barrier(CODE);
     33 }