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scram: run _PTS(5) and disable GPEs before entering S5. x200s shuts down properly now

--- a/sys/src/cmd/scram.c

+++ b/sys/src/cmd/scram.c

@@ -6,6 +6,7 @@

 int fd, iofd;

 struct Ureg u;

 ulong PM1a_CNT_BLK, PM1b_CNT_BLK, SLP_TYPa, SLP_TYPb;

+ulong GPE0_BLK, GPE1_BLK, GPE0_BLK_LEN, GPE1_BLK_LEN;

 enum {

 	SLP_EN = 0x2000,

 	SLP_TM = 0x1c00,

@@ -78,6 +79,10 @@

 		else if(memcmp("FACP", t->sig, 4) == 0){

 			PM1a_CNT_BLK = get32(((uchar*)t) + 64);

 			PM1b_CNT_BLK = get32(((uchar*)t) + 68);

+			GPE0_BLK = get32(((uchar*)t) + 80);

+			GPE1_BLK = get32(((uchar*)t) + 84);

+			GPE0_BLK_LEN = *(((uchar*)t) + 92);

+			GPE1_BLK_LEN = *(((uchar*)t) + 93);

 		}

 	}

 	if(amleval(amlwalk(amlroot, "_S5"), "", &r) < 0)

@@ -121,6 +126,8 @@

 void

 main()

 {

+	int n;

+

 	wirecpu0();

 	if((fd = open("/dev/apm", ORDWR)) < 0)

@@ -145,6 +152,19 @@

 			goto fail;

 	if(loadacpi() < 0)

 		goto fail;

+

+	/* prepare for sleep */

+	amleval(amlwalk(amlroot, "_PTS"), "i", 5, nil);

+

+	/* disable GPEs */

+	for(n = 0; GPE0_BLK > 0 && n < GPE0_BLK_LEN/2; n += 2){

+		outw(GPE0_BLK + GPE0_BLK_LEN/2 + n, 0); /* EN */

+		outw(GPE0_BLK + n, 0xff); /* STS */

+	}

+	for(n = 0; GPE1_BLK > 0 && n < GPE1_BLK_LEN/2; n += 2){

+		outw(GPE1_BLK + GPE1_BLK_LEN/2 + n, 0); /* EN */

+		outw(GPE1_BLK + n, 0xff); /* STS */

+	}

 	outw(PM1a_CNT_BLK, ((SLP_TYPa << 10) & SLP_TM) | SLP_EN);

 	outw(PM1b_CNT_BLK, ((SLP_TYPb << 10) & SLP_TM) | SLP_EN);