/* * mips reboot trampoline code */#include	"u.h"#include	"../port/lib.h"#include	"mem.h"#include	"dat.h"#include	"fns.h"#include	"io.h" #define csr8r(r)	(((ulong *)PHYSCONS)[r])#define csr8o(r, v)	(((ulong *)PHYSCONS)[r] = (v)) enum {					/* i8250 registers */	Thr		= 0,		/* Transmitter Holding (WO) */	Lsr		= 5,		/* Line Status */};enum {					/* Lsr */	Thre		= 0x20,		/* Thr Empty */}; void	putc(int); /* * Copy the new kernel to its correct location in physical memory, * flush caches, ignore TLBs (we're in KSEG0 space), and jump to * the start of the kernel. */voidmain(ulong aentry, ulong acode, ulong asize){	void (*kernel)(void);	static ulong entry, code, size; 	putc('B'); putc('o'); putc('o'); putc('t');	/* copy args to heap before moving stack to before a.out header */	entry = aentry;	code = acode;	size = asize;	setsp(entry-0x20-4); 	memmove((void *)entry, (void *)code, size); 	cleancache();	coherence(); 	/*	 * jump to kernel entry point.	 */	putc(' ');	kernel = (void*)entry;	(*kernel)();			/* off we go - never to return */ 	putc('?');	putc('!');	for(;;)		;} voidputc(int c){	int i; 	for(i = 0; !(csr8r(Lsr) & Thre) && i < 1000000; i++)		;	csr8o(Thr, (uchar)c);	for(i = 0; !(csr8r(Lsr) & Thre) && i < 1000000; i++)		;} longsyscall(Ureg*){	return -1;} voidtrap(Ureg *){}