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libaml: tow eisaid inside the environment

--- a/sys/man/2/aml

+++ b/sys/man/2/aml

@@ -1,6 +1,6 @@

 .TH AML 2

 .SH NAME

-amltag, amlval, amlint, amllen, amlnew, amlinit, amlexit, amlload, amlwalk, amleval, amlenum, amltake, amldrop - ACPI machine language interpreter

+amltag, amlval, amlint, amllen, amlnew, amlinit, amlexit, amlload, amlwalk, amleval, amlenum, amltake, amldrop, amleisaid - ACPI machine language interpreter

 .SH SYNOPSIS

 .\" .ta 0.75i 1.5i 2.25i 3i 3.75i 4.5i

 .ta 0.7i +0.7i +0.7i +0.7i +0.7i +0.7i +0.7i

@@ -27,6 +27,8 @@

 void	amltake(void *);

 void	amldrop(void *);

+char*	amleisaid(void *);

+

 void*	amlroot;

 int	amldebug;

 uvlong	amlintmask;

@@ -203,6 +205,13 @@

 Objects stay valid as long as they are reachable from

 .IR amlroot .

 .bp

+.TP

+.BI amleisaid( p )

+.I Amleisaid

+returns the string value of an EISA id.

+For strings, it simply returns the string.

+For integers, it decodes the compressed EISA id into it's string representation.

+For any other type, the return value is nil.

 .PP

 The aml library can be linked into userspace programs

 and the kernel which have different means of hardware access

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

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

@@ -274,26 +274,6 @@

 	bus->aintr = ai;

 }

-static char*

-eisaid(void *v)

-{

-	static char id[8];

-	ulong b, l;

-	int i;

-

-	if(amltag(v) == 's')

-		return v;

-	b = amlint(v);

-	for(l = 0, i=24; i>=0; i -= 8, b >>= 8)

-		l |= (b & 0xFF) << i;

-	id[7] = 0;

-	for(i=6; i>=3; i--, l >>= 4)

-		id[i] = "0123456789ABCDEF"[l & 0xF];

-	for(i=2; i>=0; i--, l >>= 5)

-		id[i] = '@' + (l & 0x1F);

-	return id;

-}

-

 static int

 pcibusno(void *dot)

 {

@@ -305,7 +285,7 @@

 	id = nil;

 	if((x = amlwalk(dot, "^_HID")) != nil)

 		if((p = amlval(x)) != nil)

-			id = eisaid(p);

+			id = amleisaid(p);

 	if((x = amlwalk(dot, "^_BBN")) == nil)

 		if((x = amlwalk(dot, "^_ADR")) == nil)

 			return -1;

@@ -515,7 +495,7 @@

 	char *id;

 	b = nil;

-	id = eisaid(amlval(amlwalk(dot, "^_HID")));

+	id = amleisaid(amlval(amlwalk(dot, "^_HID")));

 	if(id == nil || strcmp(id, "PNP0C09") != 0)

 		return 1;

 	if((x = amlwalk(dot, "^_CRS")) == nil)

--- a/sys/src/cmd/aux/acpi.c

+++ b/sys/src/cmd/aux/acpi.c

@@ -63,32 +63,14 @@

 static Therm therms[16];

 static Bat bats[4];

-static char*

-eisaid(void *v)

-{

-	static char id[8];

-	ulong b, l;

-	int i;

-

-	if(amltag(v) == 's')

-		return v;

-	b = amlint(v);

-	for(l = 0, i = 24; i >= 0; i -= 8, b >>= 8)

-		l |= (b & 0xFF) << i;

-	id[7] = 0;

-	for(i = 6; i >= 3; i--, l >>= 4)

-		id[i] = "0123456789ABCDEF"[l & 0xF];

-	for(i = 2; i >= 0; i--, l >>= 5)

-		id[i] = '@' + (l & 0x1F);

-	return id;

-}

-

 static int

 enumec(void *dot, void *)

 {

 	void *p;

 	char *id;

-	id = eisaid(amlval(amlwalk(dot, "^_HID")));

+

+	p = amlval(amlwalk(dot, "^_HID"));

+	id = amleisaid(p);

 	if(id == nil || strcmp(id, "PNP0C09") != 0)

 		return 1;

 	p = amlwalk(dot, "^_REG");

--- a/sys/src/libaml/aml.c

+++ b/sys/src/libaml/aml.c

@@ -2463,3 +2463,38 @@

 	if(p != nil)

 		D2H(p)->mark &= ~2;

 }

+

+char*

+amleisaid(void *v)

+{

+	int i;

+	ulong l, m, n;

+	static char s[8];

+

+	if(amltag(v) == 's')

+		return v;

+

+	if(amltag(v) == 'i') {

+		m = 0;

+		l = amlint(v);

+		for(i = 24; i >= 0; i -= 8) {

+			m |= (l & 0xff) << i;

+			l >>= 8;

+		}

+

+		s[7] = 0;

+		for(i = 6; i >= 3; i--) {

+			n = m & 0xf;

+			s[i] = "0123456789ABCDEF"[n]; m >>= 4;

+		}

+

+		for(i = 2; i >= 0; i--) {

+			n = m & 0x1f;

+			s[i] = '@' + n; m >>= 5;

+		}

+

+		return s;

+	}

+

+	return nil;

+}