c401x.c

mips架构的bootloader,99左右的版本 但源代码现在没人更新了

/*************************************************************
 * File: c401x.c
 * Purpose: provide 401x-specific routines for PMON
 * Author: Phil Bunce ([e-mail])
 * Revision History:
 *	970515	Created using code from bsps/401x.c
 */

#ifndef LR4010
#define LR4010
#endif
#include <pmon.h>
#include <mips.h>

#define ONLY_FLUSH_WHEN_NEEDED /* optimize the flushes */

#define VALID_BIT (1<<1)
#define BUGFIX		/* needed for 4010 */


int ilock_active;

extern int iflush_needed;
extern int dflush_needed;
extern int verbose;
extern int icache_size;
extern int cache_line_size;

/*************************************************************
*  Ulong readCache401x(set,what,addr)
*	read one word from a cache
*	what: ICACHETAG DCACHETAG ICACHERAM DCACHERAM
*	Note that *all* LDs and STs go to the cache when ISC is set.
*/
Ulong readCache401x(set,what,addr)
int set,what;
Ulong addr;
{
Ulong ccc,tmpcfg,tag;

/* we are already in an isr with ints disabled */
/* the instr buffer is in kseg1 */
tmpcfg = ccc = read_target(XT_CP0,C0_CCC,0);

tmpcfg &= ~(CCC_IE1|CCC_IE0|CCC_DE0|CCC_DE1);
tmpcfg |= CCC_ISC;

if (what == ICACHETAG || what == DCACHETAG) tmpcfg |= CCC_TAG;

if (what == ICACHETAG || what == ICACHERAM) {
	if (set) tmpcfg |= CCC_IE1;
	else tmpcfg |= CCC_IE0;
	}
else if (what == DCACHETAG || what == DCACHERAM) {
	if (set) tmpcfg |= CCC_DE1;
	else tmpcfg |= CCC_DE0;
	}

return specialRead401x(addr,tmpcfg);
}

/*************************************************************
*  writeCache401x(set,what,addr,tag)
*	UNTESTED
*/
writeCache401x(set,what,addr,tag)
int set,what;
Ulong addr,tag;
{
Ulong ccc,tmpcfg;

/* we are already in an isr with ints disabled */
/* the instr buffer is in kseg1 */
tmpcfg = ccc = read_target(XT_CP0,C0_CCC,0);

tmpcfg &= ~(CCC_IE1|CCC_IE0|CCC_DE0|CCC_DE1);
tmpcfg |= CCC_ISC;

if (what == ICACHETAG || what == DCACHETAG) tmpcfg |= CCC_TAG;

if (what == ICACHETAG || what == ICACHERAM) {
	if (set) tmpcfg |= CCC_IE1;
	else tmpcfg |= CCC_IE0;
	}
else if (what == DCACHETAG || what == DCACHERAM) {
	if (set) tmpcfg |= CCC_DE1;
	else tmpcfg |= CCC_DE0;
	}

#if 0
writeGpr(8,tmpcfg);
send_instr(MTC0(8,C0_CCC)); /* 3 nops before ld or st */
send_instr(0);
send_instr(0);
send_instr(0);

/* write the cache */
writeGpr(8,tag);
writeGpr(9,addr);
send_instr(SW(8,0,9));
send_instr(0);

/* restore CCC */
writeGpr(8,ccc);
send_instr(MTC0(8,C0_CCC));
readA0();
#endif

}

/*************************************************************
*/
Optdesc cache_opts401x[] = {
	{"[-idv][set [addr]]","display cache"},
	{"set","select set (default 0)"},
	{"addr","specify address"},
	{"-i","display icache"},
	{"-d","display dcache (default)"},
	{"-v","display only valid entries"},
	{0}};

do_cache401x(ac,av)
int ac;
char *av[];
{
int n,i,j,set,vflag,iflag;
int cacheram,cachetag;
static Ulong next_adr;
Ulong adr,tag,ccc;

vflag = iflag = 0;
for (n=0,i=1;i<ac;i++) {
	if (av[i][0] == '-') {
		if (strequ(av[i],"-v")) vflag = 1;
		else if (strequ(av[i],"-i")) iflag = 1;
		else if (strequ(av[i],"-d")) iflag = 0;
		else {
			printf("%s: unknown option\n",av[i]);
			return;
			}
		}
	else if (n==0) {
		if (!get_rsa(&set,av[i])) return;
		n++;
		}
	else if (n==1) {
		if (!get_rsa(&adr,av[i])) return;
		n++;
		}
	else {
		printf("%s: too many args\n",av[i]);
		return;
		}
	}
if (n==0) set = 0;
if (n<2) adr = next_adr;

if (iflag) {
	cachetag = ICACHETAG;
	cacheram = ICACHERAM;
	}
else {
	cachetag = DCACHETAG;
	cacheram = DCACHERAM;
	}

/* cache lines always start on 32-byte boundaries */
adr &= ~(cache_line_size-1); 

printf("Displaying %s set %d\n",(iflag)?"icache":"dcache",set);

ccc = read_target(XT_CP0,C0_CCC,0);
if (    (iflag && set == 1 && ccc&CCC_ISR1) ||
	(!iflag && set == 0 && ccc&CCC_SR0) ||
	(!iflag && set == 1 && ccc&CCC_SR1))
		printf("This set is in scatchpad mode\n");

for (n=j=0;j<8;adr += cache_line_size,n++) {
	if (n > icache_size/cache_line_size) break;
	tag = readCache401x(set,cachetag,adr);
	if (vflag && (tag&VALID_BIT)==0) continue;
	printf("%08x  %08x ",adr,readCache401x(set,cacheram,adr));
	printf("%08x ",readCache401x(set,cacheram,adr+4));
	printf("%08x ",readCache401x(set,cacheram,adr+8));
	printf("%08x\n          ",readCache401x(set,cacheram,adr+12));
	printf("%08x ",readCache401x(set,cacheram,adr+16));
	printf("%08x ",readCache401x(set,cacheram,adr+20));
	printf("%08x ",readCache401x(set,cacheram,adr+24));
	printf("%08x ",readCache401x(set,cacheram,adr+28));
	printf(" %08x\n",tag);
	j++;
	}
next_adr = adr;
}

/*************************************************************
*  ilockReq401x(addr)
*       verify that other ilock bpts don't conflict with this one
*               (ie. are a cachesize multiple apart).
*       Also verify that lock bit is not already set.
*/
ilockReq401x(addr)
Ulong addr;
{
Ulong ccc,tmsk,omsk;
int i;

ccc = mfc0(C0_CCC);
if (ccc&CCC_ISR1) return(0);

tmsk = (icache_size)-1; /* tag mask */
omsk = tmsk&~(cache_line_size-1); /* offset mask */
for (i=0;i<MAX_BPT;i++) {
        if (brkList[i].type==0) continue;
        if (brkList[i].method != BRK_METHOD_ROM) continue;
        if ((addr&omsk) != (brkList[i].addr&omsk)) continue; /* not same line */        if ((addr&~tmsk) == (brkList[i].addr&~tmsk)) return(0); /* same tag */
        }
return(1);
}