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9boot: add e820 scan to bootloader

--- a/sys/src/9/pc/memory.c

+++ b/sys/src/9/pc/memory.c

@@ -673,35 +673,51 @@

 	ulong cont, base, len;

 	uvlong last;

 	Emap *e;

+	char *s;

-	if(getconf("*norealmode") || getconf("*noe820scan"))

-		return -1;

-

-	cont = 0;

-	for(i=0; i<nelem(emap); i++){

-		memset(&u, 0, sizeof u);

-		u.ax = 0xE820;

-		u.bx = cont;

-		u.cx = 20;

-		u.dx = SMAP;

-		u.es = (PADDR(RMBUF)>>4)&0xF000;

-		u.di = PADDR(RMBUF)&0xFFFF;

-		u.trap = 0x15;

-		realmode(&u);

-		cont = u.bx;

-		if((u.flags&Carry) || u.ax != SMAP || u.cx != 20)

-			break;

-		e = &emap[nemap++];

-		*e = *(Emap*)RMBUF;

-		if(u.bx == 0)

-			break;

+	if((s = getconf("e820")) != nil){

+		for(nemap = 0; nemap < nelem(emap); nemap++){

+			if(*s == 0)

+				break;

+			e = emap + nemap;

+			e->base = strtoull(s, &s, 16);

+			if(*s != ' ')

+				break;

+			e->len = strtoull(s, &s, 16) - e->base;

+			if(*s != ' ' && *s != 0 || e->len >= 1ull<<32 || e->len == 0)

+				break;

+			e->type = Ememory;

+		}

+	}else{

+		if(getconf("*norealmode") || getconf("*noe820scan"))

+			return -1;

+		cont = 0;

+		for(i=0; i<nelem(emap); i++){

+			memset(&u, 0, sizeof u);

+			u.ax = 0xE820;

+			u.bx = cont;

+			u.cx = 20;

+			u.dx = SMAP;

+			u.es = (PADDR(RMBUF)>>4)&0xF000;

+			u.di = PADDR(RMBUF)&0xFFFF;

+			u.trap = 0x15;

+			realmode(&u);

+			cont = u.bx;

+			if((u.flags&Carry) || u.ax != SMAP || u.cx != 20)

+				break;

+			e = &emap[nemap++];

+			*e = *(Emap*)RMBUF;

+			if(u.bx == 0)

+				break;

+		}

 	}

+

 	if(nemap == 0)

 		return -1;

 	qsort(emap, nemap, sizeof emap[0], emapcmp);

-	if(getconf("*noe820print") == nil){

+	if(s == nil && getconf("*noe820print") == nil){

 		for(i=0; i<nemap; i++){

 			e = &emap[i];

 			print("E820: %.8llux %.8llux ", e->base, e->base+e->len);

--- a/sys/src/boot/pc/apm.s

+++ b/sys/src/boot/pc/apm.s

@@ -7,19 +7,19 @@

 	PUSHR(rBX)

 	LWI(0x5300, rAX)

-	INT $0x15

+	BIOSCALL(0x15)

 	POPR(rBX)

 	JC noapm

 	PUSHR(rBX)

 	LWI(0x5304, rAX)

-	INT $0x15

+	BIOSCALL(0x15)

 	POPR(rBX)

 	CLC

 	/* connect */

 	LWI(0x5303, rAX)

-	INT $0x15

+	BIOSCALL(0x15)

 	JC noapm

 	OPSIZE; PUSHR(rSI)

--- /dev/null

+++ b/sys/src/boot/pc/e820.s

@@ -1,0 +1,20 @@

+#include "x16.h"

+#include "mem.h"

+

+TEXT e820(SB), $0

+	MOVL bx+4(SP), BX

+	MOVL p+8(SP), DI

+

+	MOVL $0xe820, AX

+	MOVL $0x534D4150, DX

+	CALL rmode16(SB)

+	LWI(24, rCX)

+	BIOSCALL(0x15)

+	JC _bad

+	CALL16(pmode32(SB))

+	MOVL BX, AX

+	RET

+_bad:

+	CALL16(pmode32(SB))

+	XORL AX, AX

+	RET

--- a/sys/src/boot/pc/fns.h

+++ b/sys/src/boot/pc/fns.h

@@ -9,8 +9,6 @@

 int getc(void);

 int gotc(void);

 void putc(int c);

-void a20(void);

-void apm(int id);

 void halt(void);

 void jump(void *pc);

--- a/sys/src/boot/pc/mkfile

+++ b/sys/src/boot/pc/mkfile

@@ -36,7 +36,7 @@

 	$LD -o $target -H3 -T0x0600 -l $prereq

 	ls -l $target

-9boot&:	l%.$O %.$O sub.$O apm.$O a20.$O

+9boot&:	l%.$O %.$O sub.$O apm.$O e820.$O a20.$O

 	$LD -o $target -H3 -T0x7c00 -l $prereq

 	ls -l $target

--- a/sys/src/boot/pc/sub.c

+++ b/sys/src/boot/pc/sub.c

@@ -235,6 +235,8 @@

 	*confend = 0;

 }

+void apm(int id);

+

 static void

 apmconf(int id)

 {

@@ -263,6 +265,73 @@

 	*confend++ = '\n';

 }

+ulong e820(ulong bx, void *p);

+

+static void

+e820conf(void)

+{

+	struct {

+		uvlong	base;

+		uvlong	len;

+		ulong	typ;

+		ulong	ext;

+	} e;

+	uvlong v;

+	ulong bx;

+	char *s;

+

+	memset(&e, 0, sizeof(e));

+	if((bx = e820(0, &e)) == 0)

+		return;

+

+	memmove(confend, "e820=", 5);

+	confend += 5;

+

+	do{

+		s = confend;

+		v = e.base;

+		addconfx("", 8, v>>32);

+		addconfx("", 8, v&0xffffffff);

+		v = e.base + e.len;

+		addconfx(" ", 8, v>>32);

+		addconfx("", 8, v&0xffffffff);

+

+		print(s);

+

+		switch(e.typ){

+		case 1:

+			print(" ram");

+			break;

+		case 2:

+			print(" reserved");

+			break;

+		case 3:

+			print(" acpi reclaim");

+			break;

+		case 4:

+			print(" acpi nvs");

+			break;

+		case 5:

+			print(" bad");

+			break;

+		default:

+			print(" ???");

+		}

+		print(crnl);

+

+		if(e.typ == 1 && (e.ext & 1) == 0)

+			*confend++ = ' ';

+		else

+			confend = s;

+		memset(&e, 0, sizeof(e));

+	} while(bx = e820(bx, &e));

+

+	*confend++ = '\n';

+	*confend = 0;

+}

+

+void a20(void);

+

 char*

 bootkern(void *f)

 {

@@ -269,6 +338,8 @@

 	uchar *e, *d, *t;

 	ulong n;

 	Exec ex;

+

+	e820conf();

 	a20();

 	if(readn(f, &ex, sizeof(ex)) != sizeof(ex))