Subversion Repositories planix.SVN

Rev

Rev 2 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 - 1 
/*
2 
 * mips reboot trampoline code
3 
 */
4 
#include	"u.h"
5 
#include	"../port/lib.h"
6 
#include	"mem.h"
7 
#include	"dat.h"
8 
#include	"fns.h"
9 
#include	"io.h"
10 
 
11 
#define csr8r(r)	(((ulong *)PHYSCONS)[r])
12 
#define csr8o(r, v)	(((ulong *)PHYSCONS)[r] = (v))
13 
 
14 
enum {					/* i8250 registers */
15 
	Thr		= 0,		/* Transmitter Holding (WO) */
16 
	Lsr		= 5,		/* Line Status */
17 
};
18 
enum {					/* Lsr */
19 
	Thre		= 0x20,		/* Thr Empty */
20 
};
21 
 
22 
void	putc(int);
23 
 
24 
/*
25 
 * Copy the new kernel to its correct location in physical memory,
26 
 * flush caches, ignore TLBs (we're in KSEG0 space), and jump to
27 
 * the start of the kernel.
28 
 */
29 
void
30 
main(ulong aentry, ulong acode, ulong asize)
31 
{
32 
	void (*kernel)(void);
33 
	static ulong entry, code, size;
34 
 
35 
	putc('B'); putc('o'); putc('o'); putc('t');
36 
	/* copy args to heap before moving stack to before a.out header */
37 
	entry = aentry;
38 
	code = acode;
39 
	size = asize;
40 
	setsp(entry-0x20-4);
41 
 
42 
	memmove((void *)entry, (void *)code, size);
43 
 
44 
	cleancache();
45 
	coherence();
46 
 
47 
	/*
48 
	 * jump to kernel entry point.
49 
	 */
50 
	putc(' ');
51 
	kernel = (void*)entry;
52 
	(*kernel)();			/* off we go - never to return */
53 
 
54 
	putc('?');
55 
	putc('!');
56 
	for(;;)
57 
		;
58 
}
59 
 
60 
void
61 
putc(int c)
62 
{
63 
	int i;
64 
 
65 
	for(i = 0; !(csr8r(Lsr) & Thre) && i < 1000000; i++)
66 
		;
67 
	csr8o(Thr, (uchar)c);
68 
	for(i = 0; !(csr8r(Lsr) & Thre) && i < 1000000; i++)
69 
		;
70 
}
71 
 
72 
long
73 
syscall(Ureg*)
74 
{
75 
	return -1;
76 
}
77 
 
78 
void
79 
trap(Ureg *)
80 
{
81 
}