main.c

系统启动时检测内存状况的软件C代码

/* main.c - MemTest-86  Version 3.2
 *
 * Released under version 2 of the Gnu Public License.
 * By Chris Brady
 * ----------------------------------------------------
 * MemTest86+ V1.65 Specific code (GPL V2.0)
 * By Samuel DEMEULEMEESTER, [e-mail]
 * http://www.x86-secret.com - http://www.memtest.org
 */

#include "test.h"
#include "defs.h"
#undef TEST_TIMES
#define DEFTESTS 11

extern void bzero();

const struct tseq tseq[] = {
	{1,  5,  3,   0, 0, "[Address test, walking ones]          "},
	{1,  6,  3,   2, 0, "[Address test, own address]           "},
	{1,  0,  3,  14, 0, "[Moving inversions, ones & zeros]     "},
	{1,  1,  2,  80, 0, "[Moving inversions, 8 bit pattern]    "},
	{1, 10, 60, 300, 0, "[Moving inversions, random pattern]   "},
	{1,  7, 64,  66, 0, "[Block move, 64 moves]                "},
	{1,  2,  2, 320, 0, "[Moving inversions, 32 bit pattern]   "},
	{1,  9, 40, 120, 0, "[Random number sequence]              "},
	{1,  3,  4, 240, 0, "[Modulo 20, ones & zeros]             "},
	{1,  8,  1,   2, 0, "[Bit fade test, 90 min, 2 patterns]   "},
	{0,  4,  3,   2, 0, "[[Moving inversions, 0 & 1, uncached] "},
	{0,  0,  0,   0, 0, NULL}
};

char firsttime = 0;

struct vars variables = {};
struct vars * const v = &variables;

volatile ulong *p = 0;
ulong p1 = 0, p2 = 0, p0 = 0;
int segs = 0, bail = 0;
int test_ticks;
int nticks;

static int window = 0;
static struct pmap windows[] =
{
	{ 0/* Written at startup */, 0x100000 },
	{ 0, RES_START >> 12 },

	{ 0x100000, 0x180000 },
	{ 0x180000, 0x200000 },

	{ 0x200000, 0x280000 },
	{ 0x280000, 0x300000 },

	{ 0x300000, 0x380000 },
	{ 0x380000, 0x400000 },

	{ 0x400000, 0x480000 },
	{ 0x480000, 0x500000 },

	{ 0x500000, 0x580000 },
	{ 0x580000, 0x600000 },

	{ 0x600000, 0x680000 },
	{ 0x680000, 0x700000 },

	{ 0x700000, 0x780000 },
	{ 0x780000, 0x800000 },

	{ 0x800000, 0x880000 },
	{ 0x880000, 0x900000 },

	{ 0x900000, 0x980000 },
	{ 0x980000, 0xA00000 },

	{ 0xA00000, 0xA80000 },
	{ 0xA80000, 0xB00000 },

	{ 0xB00000, 0xB80000 },
	{ 0xB80000, 0xC00000 },

	{ 0xC00000, 0xC80000 },
	{ 0xC80000, 0xD00000 },

	{ 0xD00000, 0xD80000 },
	{ 0xD80000, 0xE00000 },

	{ 0xE00000, 0xE80000 },
	{ 0xE80000, 0xF00000 },

	{ 0xF00000, 0xF80000 },
	{ 0xF80000, 0x1000000 },
};

#if (LOW_TEST_ADR >= HIGH_TEST_ADR)
#error LOW_TEST_ADR and HIGH_TEST_ADR may not overlap
#endif
#if (LOW_TEST_ADR > (640*1024))
#error LOW_TEST_ADR must be below 640K
#endif

static int find_ticks_for_test(unsigned long chunks, int test);
static void compute_segments(int win);

static void __run_at(unsigned long addr)
{
	/* Copy memtest86 code */
	memmove((void *)addr, &_start, _end - _start);
	/* Jump to the start address */
	p = (ulong *)(addr + startup_32 - _start);
	goto *p;
}

static unsigned long run_at_addr = 0xffffffff;
static void run_at(unsigned long addr)
{
	unsigned long start;
	unsigned long len;

	run_at_addr = addr;

	start = (unsigned long) &_start;
	len = _end - _start;
	if (	((start < addr) && ((start + len) >= addr)) ||
		((addr < start) &&  ((addr + len) >= start))) {
		/* Handle overlap by doing an extra relocation */
		if (addr + len < HIGH_TEST_ADR) {
			__run_at(HIGH_TEST_ADR);
		}
		else if (start + len < addr) {
			__run_at(LOW_TEST_ADR);
		}
	}
	__run_at(run_at_addr);
}

void do_test(void)
{
	int i = 0;
	unsigned long chunks;
	unsigned long lo, hi;

	/* If we have a partial relocation finish it */
	if (run_at_addr == (unsigned long)&_start) {
		run_at_addr = 0xffffffff;
	} else if (run_at_addr != 0xffffffff) {
		__run_at(run_at_addr);
	}

	/* If first time, initialize test */
	if (firsttime == 0) {
		if ((ulong)&_start != LOW_TEST_ADR) {
			restart();
		}
		windows[0].start =
			( LOW_TEST_ADR + (_end - _start) + 4095) >> 12;
		init();
		firsttime = 1;
	}
	bail = 0;

	/* Find the memory areas I am going to test */
	compute_segments(window);
	if (segs == 0) {
		goto skip_window;
	}
	/* Now map in the window... */
	if (map_page(v->map[0].pbase_addr) < 0) {
		goto skip_window;
	}

	/* Update display of memory segments being tested */
	lo = page_of(v->map[0].start);
	hi = page_of(v->map[segs -1].end);
	aprint(LINE_RANGE, COL_MID+9, lo);
	cprint(LINE_RANGE, COL_MID+14, " - ");
	aprint(LINE_RANGE, COL_MID+17, hi);
	aprint(LINE_RANGE, COL_MID+23, v->selected_pages);
	cprint(LINE_RANGE, COL_MID+28,
		((ulong)&_start == LOW_TEST_ADR)?"          ":" Relocated");

#ifdef TEST_TIMES
	{
		ulong l, h, t;

		asm __volatile__ (
			"rdtsc\n\t"
			"subl %%ebx,%%eax\n\t"
			"sbbl %%ecx,%%edx\n\t"
			:"=a" (l), "=d" (h)
			:"b" (v->snapl), "c" (v->snaph)
		);

		cprint(20, 5, ":  :");
		t = h * ((unsigned)0xffffffff / v->clks_msec) / 1000;
		t += (l / v->clks_msec) / 1000;
		i = t % 60;
		dprint(20, 10, i%10, 1, 0);
		dprint(20, 9, i/10, 1, 0);
		t /= 60;
		i = t % 60;
		dprint(20, +7, i % 10, 1, 0);
		dprint(20, +6, i / 10, 1, 0);
		t /= 60;
		dprint(20, 0, t, 5, 0);

		asm __volatile__ ("rdtsc":"=a" (v->snapl),"=d" (v->snaph));
	}
#endif
	/* Now setup the test parameters based on the current test number */
	/* Figure out the next test to run */
	if (v->testsel >= 0) {
		v->test = v->testsel;
	}
	dprint(LINE_TST, COL_MID+6, v->test, 2, 1);
	cprint(LINE_TST, COL_MID+9, tseq[v->test].msg);
	set_cache(tseq[v->test].cache);

	/* Compute the number of SPINSZ memory segments */
	chunks = 0;
	for(i = 0; i < segs; i++) {
		unsigned long len;
		len = v->map[i].end - v->map[i].start;
		chunks += (len + SPINSZ -1)/SPINSZ;
	}
	test_ticks = find_ticks_for_test(chunks, v->test);
	nticks = 0;
	v->tptr = 0;
	cprint(1, COL_MID+8, "                                         ");
	switch(tseq[v->test].pat) {

	/* Now do the testing according to the selected pattern */
	case 0:	/* Moving inversions, all ones and zeros */
	case 1: /* Moving inversions, 8 bit wide walking ones and zeros. */
	case 4:
	
		if (tseq[v->test].pat == 1)
			p0 = 0x80808080;
		else
			p0 = 0;

		for ( ; ; ) {
			movinv1(tseq[v->test].iter,p0,~p0);
			BAILOUT;

			/* Switch patterns */
			movinv1(tseq[v->test].iter,~p0,p0);
			BAILOUT
			if ( !((unsigned char)(p0 >>= 1) & 0x7F) )
				break;
		}
		break;


	case 2: /* Moving inversions, 32 bit shifting pattern, very long */
		for (i=0, p1=1; p1; p1=p1<<1, i++) {
			movinv32(tseq[v->test].iter,p1, 1, 0x80000000, 0, i);
			BAILOUT
			movinv32(tseq[v->test].iter,~p1, 0xfffffffe, 0x7fffffff, 1, i);
			BAILOUT
		}
		break;

	case 3: /* Modulo X check, all ones and zeros */
		p1=0;
		for (i=0; i<MOD_SZ; i++) {
			p2 = ~p1;
			modtst(i, tseq[v->test].iter, p1, p2);
			BAILOUT

			/* Switch patterns */
			p2 = p1;
			p1 = ~p2;
			modtst(i, tseq[v->test].iter, p1,p2);
			BAILOUT
		}
		break;

	case 5: /* Address test, walking ones */
		addr_tst1();
		BAILOUT;
		break;

	case 6: /* Address test, own address */
		addr_tst2();
		BAILOUT;
		break;

	case 7: /* Block move test */
		block_move(tseq[v->test].iter);
		BAILOUT;
		break;

	case 8: /* Bit fade test */
		if (window == 0 ) {
			bit_fade();
		}
		BAILOUT;
		break;
		
	case 9: /* Random Data Sequence */
		for (i=0; i < tseq[v->test].iter; i++) {
			movinvr();
			BAILOUT;
		}
		break;
	case 10: /* Random Data */
		for (i=0; i < tseq[v->test].iter; i++) {
			p1 = rand();
			p2 = ~p1;
			movinv1(2,p1,p2);
			BAILOUT;
		}
		break;
	}
 skip_window:
	if (bail) {
		goto bail_test;
	}
	/* Rever to the default mapping and enable the cache */
	paging_off();
	set_cache(1);
	window++;
	if (window >= sizeof(windows)/sizeof(windows[0])) {
		window = 0;
	}
	/* We finished the test so clear the pattern */
	cprint(LINE_PAT, COL_PAT, "            ");
	if (window != 0) {
		/* Relocate and run the high copy if:
		 * - The window overwrites us.
		 *   The lower limit is less than START_ADR
		 * - There is more than 1 meg of memory
		 */
		if (windows[window].start <
			(LOW_TEST_ADR + (_end - _start)) >> 12) {
			if (v->pmap[v->msegs-1].end >
				(((HIGH_TEST_ADR + (_end - _start)) >> 12) +1)) {
				/* We need the high copy and we have enough
				 * memory so use it.
				 */
				run_at(HIGH_TEST_ADR);
			} else {
				/* We can't use this window so skip it */
				goto skip_window;
			}
		} else {
			/* We don't need the high copy for this test */
			run_at(LOW_TEST_ADR);
		}
	}
	else {
		/* We have run this test in all of the windows
		 * advance to the next test.
		 */
	skip_test:
		v->test++;
	bail_test:
		/* Revert to the default mapping
		 * and enable the cache.
		 */
		paging_off();
		set_cache(1);
		check_input();
		window = 0;
		cprint(LINE_PAT, COL_PAT-3, "   ");
		/* If this was the last test then we finished a pass */
		if (v->test >= 9 || v->testsel >= 0) {
			v->pass++;
			dprint(LINE_INFO, COL_PASS, v->pass, 5, 0);
			v->test = 0;
			v->total_ticks = 0;
			v->pptr = 0;
			cprint(0, COL_MID+8,
				"                                         ");
		}

		/* We always start a pass with the low copy */
		run_at(LOW_TEST_ADR);
	}
}

void restart()
{
	int i;
	volatile char *pp;

	/* clear variables */
	firsttime = 0;
	v->test = 0;
	v->pass = 0;
	v->msg_line = 0;
	v->ecount = 0;
	v->ecc_ecount = 0;

	/* Clear the screen */
	for(i=0, pp=(char *)(SCREEN_ADR+0); i<80*24; i++, pp+=2) {
		*pp = ' ';
	}
	run_at(LOW_TEST_ADR);
}


/* Compute the total number of ticks per pass */
void find_ticks(void)
{
	int i, j, chunks;

	v->pptr = 0;

	/* Compute the number of SPINSZ memory segments in one pass */
	chunks = 0;
	for(j = 0; j < sizeof(windows)/sizeof(windows[0]); j++) {
		compute_segments(j);
		for(i = 0; i < segs; i++) {
			unsigned long len;
			len = v->map[i].end - v->map[i].start;
			chunks += (len + SPINSZ -1)/SPINSZ;
		}
	}
	compute_segments(window);
	window = 0;
	for (v->pass_ticks=0, i=0; ((i<DEFTESTS) && (DEFTESTS != NULL)); i++) {

		/* Test to see if this test is selected for execution */
		if (v->testsel >= 0) {
			if (i != v->testsel) {
				continue;
			}
		}
		v->pass_ticks += find_ticks_for_test(chunks, i);
	}
}

static int find_ticks_for_test(unsigned long chunks, int test)
{
	int ticks;
	ticks = chunks * tseq[test].ticks;
	if (tseq[test].pat == 5) {
		/* Address test, walking ones */
		ticks = 4;
	}
	return ticks;
}

static void compute_segments(int win)
{
	unsigned long wstart, wend;
	int i;

	/* Compute the window I am testing memory in */
	wstart = windows[win].start;
	wend = windows[win].end;
	segs = 0;

	/* Now reduce my window to the area of memory I want to test */
	if (wstart < v->plim_lower) {
		wstart = v->plim_lower;
	}
	if (wend > v->plim_upper) {
		wend = v->plim_upper;
	}
	if (wstart >= wend) {
		return;
	}
	/* List the segments being tested */
	for (i=0; i< v->msegs; i++) {
		unsigned long start, end;
		start = v->pmap[i].start;
		end = v->pmap[i].end;
		if (start <= wstart) {
			start = wstart;
		}
		if (end >= wend) {
			end = wend;
		}
#if 0
		cprint(LINE_SCROLL+(2*i), 0, " (");
		hprint(LINE_SCROLL+(2*i), 2, start);
		cprint(LINE_SCROLL+(2*i), 10, ", ");
		hprint(LINE_SCROLL+(2*i), 12, end);
		cprint(LINE_SCROLL+(2*i), 20, ") ");

		cprint(LINE_SCROLL+(2*i), 22, "r(");
		hprint(LINE_SCROLL+(2*i), 24, wstart);
		cprint(LINE_SCROLL+(2*i), 32, ", ");
		hprint(LINE_SCROLL+(2*i), 34, wend);
		cprint(LINE_SCROLL+(2*i), 42, ") ");

		cprint(LINE_SCROLL+(2*i), 44, "p(");
		hprint(LINE_SCROLL+(2*i), 46, v->plim_lower);
		cprint(LINE_SCROLL+(2*i), 54, ", ");
		hprint(LINE_SCROLL+(2*i), 56, v->plim_upper);
		cprint(LINE_SCROLL+(2*i), 64, ") ");

		cprint(LINE_SCROLL+(2*i+1),  0, "w(");
		hprint(LINE_SCROLL+(2*i+1),  2, windows[win].start);
		cprint(LINE_SCROLL+(2*i+1), 10, ", ");
		hprint(LINE_SCROLL+(2*i+1), 12, windows[win].end);
		cprint(LINE_SCROLL+(2*i+1), 20, ") ");

		cprint(LINE_SCROLL+(2*i+1), 22, "m(");
		hprint(LINE_SCROLL+(2*i+1), 24, v->pmap[i].start);
		cprint(LINE_SCROLL+(2*i+1), 32, ", ");
		hprint(LINE_SCROLL+(2*i+1), 34, v->pmap[i].end);
		cprint(LINE_SCROLL+(2*i+1), 42, ") ");

		cprint(LINE_SCROLL+(2*i+1), 44, "i=");
		hprint(LINE_SCROLL+(2*i+1), 46, i);

		cprint(LINE_SCROLL+(2*i+2), 0,
			"                                        "
			"                                        ");
		cprint(LINE_SCROLL+(2*i+3), 0,
			"                                        "
			"                                        ");
#endif
		if ((start < end) && (start < wend) && (end > wstart)) {
			v->map[segs].pbase_addr = start;
			v->map[segs].start = mapping(start);
			v->map[segs].end = emapping(end);
#if 0
			cprint(LINE_SCROLL+(2*i+1), 54, " segs: ");
			hprint(LINE_SCROLL+(2*i+1), 61, segs);
#endif
			segs++;
		}
	}
}