From 85bc8ca6a317e9ce0a3ce1bf27a31df11f44ac47 Mon Sep 17 00:00:00 2001
From: Joshua Wise <joshua@rebirth.joshuawise.com>
Date: Fri, 19 Sep 2008 15:35:28 -0400
Subject: [PATCH] add a first cut at a SMI API -- not many features...

---
 aseg/Makefile          |  2 +-
 aseg/counter.c         |  9 +++++----
 aseg/firstrun.c        |  4 +++-
 grubload/Makefile      |  2 +-
 grubload/multiboot_c.c |  5 +++--
 ich2/smi.c             | 27 +++++++++++++++++++++++++++
 include/smi.h          | 10 ++++++++++
 7 files changed, 50 insertions(+), 9 deletions(-)
 create mode 100644 ich2/smi.c
 create mode 100644 include/smi.h

diff --git a/aseg/Makefile b/aseg/Makefile
index 5033a55..a43a1f2 100644
--- a/aseg/Makefile
+++ b/aseg/Makefile
@@ -1,6 +1,6 @@
 CC=gcc
 CFLAGS=-I../include -I../include/raw -nostdlib -nostdinc -fno-builtin -D__RAW__
-OBJS=counter.o firstrun.o ../pci/pci-raw.o ../lib/minilib.o ../lib/console.o
+OBJS=counter.o firstrun.o ../pci/pci-raw.o ../lib/minilib.o ../lib/console.o ../ich2/smi.o
 
 all: aseg.elf
 
diff --git a/aseg/counter.c b/aseg/counter.c
index e4b5eae..f77d256 100644
--- a/aseg/counter.c
+++ b/aseg/counter.c
@@ -62,7 +62,7 @@ void pci_dump() {
 	cts = inl(0x84C);
 	
 	outl(0x848, 0x0);
-	
+	outl(0x840, 0x0);
 	switch(cts&0xF0000)
 	{
 	case 0x20000:
@@ -95,6 +95,9 @@ void pci_dump() {
 	default:
 		dolog("Unhandled PCI cycle");
 	}
+	
+	outl(0x848, 0x1000);
+	outl(0x840, 0x0100);
 }
 
 void __start (void)
@@ -126,15 +129,13 @@ void __start (void)
 		if (inl(0x844) & 0x1000)	/* devact_sts */
 		{
 			pci_dump();
-			outl(0x848, 0x1000);
-			outl(0x844, 0x1000);
+			outl(0x844, 0x1000);	/* ack it */
 		}
 	}
 	if (inl(0x834) & 0x4000)
 		dolog("Long periodic timer");
 	if (inl(0x840) & 0x1000)
 	{
-		dolog("Caught device monitor trap");
 		pci_dump();
 		outl(0x840, 0x1100);
 		outl(0x840, 0x0100);
diff --git a/aseg/firstrun.c b/aseg/firstrun.c
index ace70c6..9977d14 100644
--- a/aseg/firstrun.c
+++ b/aseg/firstrun.c
@@ -1,4 +1,5 @@
 #include <io.h>
+#include <smi.h>
 
 void __firstrun_start() {
 /*
@@ -22,6 +23,7 @@ void __firstrun_start() {
 	pci_write16(0, 31, 4, 0xC0, 0);
 
 	/* Turn on the SMIs we want */
-	outb(0x830, inb(0x830) | 0x41);
+	outb(0x830, inb(0x830) | 0x40);
+	smi_enable();
 }
 
diff --git a/grubload/Makefile b/grubload/Makefile
index 4eef921..bc4c1fe 100644
--- a/grubload/Makefile
+++ b/grubload/Makefile
@@ -1,4 +1,4 @@
-OBJS=multiboot_c.o multiboot_asm.o realmode.o loader.o ../pci/pci-raw.o ../lib/minilib.o ../lib/console.o ../ich2/smram-ich2.o
+OBJS=multiboot_c.o multiboot_asm.o realmode.o loader.o ../pci/pci-raw.o ../lib/minilib.o ../lib/console.o ../ich2/smram-ich2.o ../ich2/smi.o
 CC=gcc
 CFLAGS=-nostdlib -I../include -I../include/raw -I. -D__RAW__ -fno-builtin -nostdinc
 
diff --git a/grubload/multiboot_c.c b/grubload/multiboot_c.c
index 6fcfa5e..e4843c3 100644
--- a/grubload/multiboot_c.c
+++ b/grubload/multiboot_c.c
@@ -1,7 +1,9 @@
 #include "console.h"
+#include <minilib.h>
 #include <io.h>
 #include <smram.h>
 #include <multiboot.h>
+#include <smi.h>
 
 #define INFO_SIGNATURE 0x5754454E
 
@@ -54,7 +56,7 @@ void c_start(unsigned int magic, struct mb_info *mbinfo)
 	puts("Current SMI state is: "); puthex(inl(0x830)); puts("\n");
 	puts("Current SMRAMC state is: "); puthex(pci_read8(0, 0, 0, 0x70)); puts("\n");
 	
-	outl(0x830, inl(0x830) & ~0x1);	/* turn off SMIs */
+	smi_disable();
 	
 	/* Try really hard to shut up USB_LEGKEY. */
 	pci_write16(0, 31, 2, 0xC0, pci_read16(0, 31, 2, 0xC0));
@@ -62,7 +64,6 @@ void c_start(unsigned int magic, struct mb_info *mbinfo)
 	pci_write16(0, 31, 4, 0xC0, pci_read16(0, 31, 4, 0xC0));
 	pci_write16(0, 31, 4, 0xC0, 0);
 
-
 	/* Open the SMRAM aperture and load our ELF. */
 	smram_state_t old_smramc = smram_save_state();
 
diff --git a/ich2/smi.c b/ich2/smi.c
new file mode 100644
index 0000000..59f14b6
--- /dev/null
+++ b/ich2/smi.c
@@ -0,0 +1,27 @@
+#include <smi.h>
+#include <pci.h>
+#include <io.h>
+#include <stdint.h>
+
+uint16_t _get_PMBASE()
+{
+	return pci_read32(0, 0, 0, 0x40) & 0xFF80;
+}
+
+void smi_disable()
+{
+	unsigned short smi_en = _get_PMBASE() + 0x30;
+	outl(smi_en, inl(smi_en) & ~0x0001);
+}
+
+void smi_enable()
+{
+	unsigned short smi_en = _get_PMBASE() + 0x30;
+	outl(smi_en, inl(smi_en) | 0x0001);
+}
+
+unsigned long smi_status()
+{
+	unsigned short smi_sts = _get_PMBASE() + 0x34;
+	return inl(smi_sts);
+}
diff --git a/include/smi.h b/include/smi.h
new file mode 100644
index 0000000..c669fc2
--- /dev/null
+++ b/include/smi.h
@@ -0,0 +1,10 @@
+#ifndef SMI_H
+#define SMI_H
+
+extern void smi_disable();	/* akin to cli / sti */
+extern void smi_enable();
+
+extern void smi_poll();
+extern unsigned long smi_status();	/* Architecturally defined; for debugging only. */
+
+#endif
-- 
2.43.0