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added support for 32 bit MSI

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

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

@@ -883,13 +883,14 @@

 enum {

 	MSICtrl = 0x02, /* message control register (16 bit) */

 	MSIAddr = 0x04, /* message address register (64 bit) */

-	MSIData = 0x0C, /* message data register (16 bit) */

+	MSIData32 = 0x08, /* message data register for 32 bit MSI (16 bit) */

+	MSIData64 = 0x0C, /* message data register for 64 bit MSI (16 bit) */

 };

 static int

 msiintrenable(Vctl *v)

 {

-	int tbdf, vno, cap, cpu;

+	int tbdf, vno, cap, cpu, ok64;

 	Pcidev *pci;

 	if(getconf("*msi") == nil)

@@ -913,9 +914,10 @@

 	vno = allocvector();

 	cpu = mpintrcpu();

+	ok64 = (pcicfgr16(pci, cap + MSICtrl) & (1<<7)) != 0;

 	pcicfgw32(pci, cap + MSIAddr, (0xFEE << 20) | (cpu << 12));

-	pcicfgw32(pci, cap + MSIAddr + 4, 0);

-	pcicfgw16(pci, cap + MSIData, vno | (1<<14));

+	if(ok64) pcicfgw32(pci, cap + MSIAddr + 4, 0);

+	pcicfgw16(pci, cap + ok64 ? MSIData64 : MSIData32, vno | (1<<14));

 	pcicfgw16(pci, cap + MSICtrl, 1);

 	print("msiintrenable: success with tbdf %.8x, vector %d, cpu %d\n", tbdf, vno, cpu);

 	v->isr = lapicisr;

-- 

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