From 07d1dd26f38ed450a9333741337e8091b37b4fc2 Mon Sep 17 00:00:00 2001
From: Joshua Wise <joshua@rebirth.joshuawise.com>
Date: Thu, 25 Sep 2008 20:56:44 -0400
Subject: [PATCH 1/1] Initial smi_event infrastructure

---
 aseg/counter.c  | 15 ++++++++++++---
 aseg/firstrun.c |  6 +++++-
 ich2/smi.c      | 46 ++++++++++++++++++++++++++++++++++++++++++----
 include/smi.h   | 15 +++++++++++++++
 4 files changed, 74 insertions(+), 8 deletions(-)

diff --git a/aseg/counter.c b/aseg/counter.c
index 1138e53..85b73eb 100644
--- a/aseg/counter.c
+++ b/aseg/counter.c
@@ -48,6 +48,18 @@ void pci_dump() {
 	outl(0x840, 0x0100);
 }
 
+void timer_handler(smi_event_t ev)
+{
+	static unsigned int ticks = 0;
+	
+	smi_disable_event(SMI_EVENT_FAST_TIMER);
+	smi_enable_event(SMI_EVENT_FAST_TIMER);
+	
+	outb(0x80, (ticks++) & 0xFF);
+	
+	outlog();
+}
+
 void smi_entry(void)
 {
 	char statstr[512];
@@ -56,8 +68,6 @@ void smi_entry(void)
 	vgasave = inb(0x3D4);
 	
 	counter++;
-	outb(0x80, (counter & 0xFF));
-	
 	sprintf(statstr, "15-412! %08x %08x", smi_status(), counter);
 	strblit(statstr, 0, 0);
 	
@@ -77,7 +87,6 @@ void smi_entry(void)
 	}
 
 	smi_poll();
-	outlog();
 	
 	outl(0xCF8, pcisave);
 	outb(0x3D4, vgasave);
diff --git a/aseg/firstrun.c b/aseg/firstrun.c
index 9589a13..323f1ab 100644
--- a/aseg/firstrun.c
+++ b/aseg/firstrun.c
@@ -7,6 +7,8 @@
 
 extern int _bss, _bssend;
 
+extern void timer_handler(smi_event_t ev);
+
 void __firstrun_start() {
 	unsigned char *bp;
 	smram_state_t smram;
@@ -26,7 +28,9 @@ void __firstrun_start() {
 	pci_write16(0, 31, 4, 0xC0, 0);
 
 	/* Turn on the SMIs we want */
-	outb(0x830, inb(0x830) | ICH2_SMI_EN_SWSMI_TMR_EN);
+	smi_disable();
+	smi_register_handler(SMI_EVENT_FAST_TIMER, timer_handler);
+	smi_enable_event(SMI_EVENT_FAST_TIMER);
 	outb(0x848, ICH2_DEVTRAP_EN_KBC_TRP_EN);
 	smi_enable();
 	
diff --git a/ich2/smi.c b/ich2/smi.c
index adba74f..d255615 100644
--- a/ich2/smi.c
+++ b/ich2/smi.c
@@ -6,6 +6,8 @@
 #include <reg-82801b.h>
 #include <output.h>
 
+static smi_handler_t _handlers[SMI_EVENT_MAX] = {0};
+
 static uint16_t _get_PMBASE()
 {
 	static long pmbase = -1;
@@ -64,11 +66,11 @@ void smi_poll()
 	
 	if (sts & ICH2_SMI_STS_SWSMI_TMR_STS)	// Ack it, then request another.
 	{
+		if (_handlers[SMI_EVENT_FAST_TIMER] == SMI_HANDLER_NONE)
+			output("Unhandled: SWSMI_TMR_STS");
+		else if (_handlers[SMI_EVENT_FAST_TIMER] != SMI_HANDLER_IGNORE)
+			_handlers[SMI_EVENT_FAST_TIMER](SMI_EVENT_FAST_TIMER);
 		outl(_get_PMBASE() + ICH2_PMBASE_SMI_STS, ICH2_SMI_STS_SWSMI_TMR_STS);
-		outl(_get_PMBASE() + ICH2_PMBASE_SMI_EN,
-			inl(_get_PMBASE() + ICH2_PMBASE_SMI_EN) & ~ICH2_SMI_EN_SWSMI_TMR_EN);
-		outl(_get_PMBASE() + ICH2_PMBASE_SMI_EN,
-			inl(_get_PMBASE() + ICH2_PMBASE_SMI_EN) | ICH2_SMI_EN_SWSMI_TMR_EN);
 	}
 	
 	if (sts & ICH2_SMI_STS_PM1_STS_REG)
@@ -165,3 +167,39 @@ void smi_poll()
 			ICH2_SMI_EN_EOS |
 			ICH2_SMI_EN_GBL_SMI_EN);
 }
+
+int smi_register_handler(smi_event_t ev, smi_handler_t hnd)
+{
+	if (ev >= SMI_EVENT_MAX)
+		return -1;
+	_handlers[ev] = hnd;
+	return 0;
+}
+
+int smi_enable_event(smi_event_t ev)
+{
+	switch(ev)
+	{
+	case SMI_EVENT_FAST_TIMER:
+		outl(_get_PMBASE() + ICH2_PMBASE_SMI_EN,
+			inl(_get_PMBASE() + ICH2_PMBASE_SMI_EN) |
+				ICH2_SMI_EN_SWSMI_TMR_EN);
+		return 0;
+	default:
+		return -1;
+	}
+}
+
+int smi_disable_event(smi_event_t ev)
+{
+	switch(ev)
+	{
+	case SMI_EVENT_FAST_TIMER:
+		outl(_get_PMBASE() + ICH2_PMBASE_SMI_EN,
+			inl(_get_PMBASE() + ICH2_PMBASE_SMI_EN) &
+				~ICH2_SMI_EN_SWSMI_TMR_EN);
+		return 0;
+	default:
+		return -1;
+	}
+}
diff --git a/include/smi.h b/include/smi.h
index c669fc2..670dc63 100644
--- a/include/smi.h
+++ b/include/smi.h
@@ -7,4 +7,19 @@ extern void smi_enable();
 extern void smi_poll();
 extern unsigned long smi_status();	/* Architecturally defined; for debugging only. */
 
+typedef enum {
+	SMI_EVENT_FAST_TIMER = 0,
+	SMI_EVENT_MAX
+} smi_event_t;
+
+
+typedef void (*smi_handler_t)(smi_event_t);
+
+#define SMI_HANDLER_NONE	((smi_handler_t)0)
+#define SMI_HANDLER_IGNORE	((smi_handler_t)-1)
+
+extern int smi_register_handler(smi_event_t ev, smi_handler_t hnd);
+extern int smi_enable_event(smi_event_t ev);
+extern int smi_disable_event(smi_event_t ev);
+
 #endif
-- 
2.43.0