9os

Experimental kernel using plan9 ideas for embedded device
git clone git://git.simple-cc.org/9os
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fvp.c (449B)

      1 #include <os9/os9.h>
      2 
      3 #include <string.h>
      4 
      5 #include "arch.h"
      6 
      7 static uint32_t *early = (uint32_t *) 0x1C090000;
      8 
      9 
     10 Mach mach = {
     11 	.phystack = 0x80080000,
     12 	.phytext = 0x80000000,
     13 	.kzero = 0xFFFFFF0000000000 - 0x80000000,
     14 };
     15 
     16 void
     17 putch(int c)
     18 {
     19 	char ch;
     20 
     21 	if (console) {
     22 		ch = c;
     23 		chanwrite(console, &ch, 1);
     24 	} else {
     25 		if (c == '\n')
     26 			putch('\r');
     27 		while (inm32(early+6) & 1<<5)
     28 			;
     29 		outm32(c, early);
     30 	}
     31 
     32 	barrier(DATA);
     33 	barrier(CODE);
     34 }