From e5d94488b04d37328aef0420beafed4afe42cef5 Mon Sep 17 00:00:00 2001
From: Jacob Potter <jdpotter@andrew.cmu.edu>
Date: Sat, 13 Sep 2008 18:34:27 -0400
Subject: [PATCH] more aseg/grubload rearrangements

---
 aseg/Makefile          | 14 +++++++-------
 aseg/aseg.lds          |  7 +++++++
 aseg/firstrun.c        | 27 +++++++++++++++++++++++++++
 grubload/multiboot_c.c | 24 ++++++++++++++++++++----
 4 files changed, 61 insertions(+), 11 deletions(-)
 create mode 100644 aseg/firstrun.c

diff --git a/aseg/Makefile b/aseg/Makefile
index fd1efa9..5033a55 100644
--- a/aseg/Makefile
+++ b/aseg/Makefile
@@ -1,17 +1,17 @@
 CC=gcc
 CFLAGS=-I../include -I../include/raw -nostdlib -nostdinc -fno-builtin -D__RAW__
-OBJS=counter.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
 
 all: aseg.elf
 
-aseg.bin: aseg.asm
-	nasm -o aseg.bin aseg.asm
-
-aseg.o: aseg.bin
-	objcopy -I binary -B i386 -O elf32-i386 aseg.bin aseg.o
-
 aseg.elf: aseg.lds aseg.o $(OBJS)
 	ld -o aseg.elf -T aseg.lds $(OBJS)
 
 clean:
 	rm -f $(OBJS) aseg.elf aseg.bin aseg.o
+
+
+%.o: %.asm
+	nasm -o $@.bin $<
+	objcopy -I binary -B i386 -O elf32-i386 $@.bin $@
+	rm -f $@.bin
diff --git a/aseg/aseg.lds b/aseg/aseg.lds
index a3a8ece..2905027 100644
--- a/aseg/aseg.lds
+++ b/aseg/aseg.lds
@@ -26,4 +26,11 @@ SECTIONS
 		. = ALIGN(0x10);
 		_stacktop = .;
 	}
+
+	. = 0x10000;
+	.info : {
+		_start = .;
+		LONG(0x5754454E);
+		LONG(__firstrun_start);
+	}
 }
diff --git a/aseg/firstrun.c b/aseg/firstrun.c
new file mode 100644
index 0000000..ace70c6
--- /dev/null
+++ b/aseg/firstrun.c
@@ -0,0 +1,27 @@
+#include <io.h>
+
+void __firstrun_start() {
+/*
+	puts("Current USB state is: ");
+	puthex(pci_read16(0, 31, 2, 0xC0));
+	puts(" ");
+	puthex(pci_read16(0, 31, 4, 0xC0));
+	puts("\n");
+	puts("Current SMI state is: ");
+	puthex(inl(0x830));
+	puts("\n");
+	puts("Current SMRAMC state is: ");
+	puthex(pci_read8(0, 0, 0, 0x70));
+	puts("\n");
+*/
+
+	/* Try really hard to shut up USB_LEGKEY. */
+	pci_write16(0, 31, 2, 0xC0, pci_read16(0, 31, 2, 0xC0));
+	pci_write16(0, 31, 2, 0xC0, 0);
+	pci_write16(0, 31, 4, 0xC0, pci_read16(0, 31, 4, 0xC0));
+	pci_write16(0, 31, 4, 0xC0, 0);
+
+	/* Turn on the SMIs we want */
+	outb(0x830, inb(0x830) | 0x41);
+}
+
diff --git a/grubload/multiboot_c.c b/grubload/multiboot_c.c
index c75e830..50aca06 100644
--- a/grubload/multiboot_c.c
+++ b/grubload/multiboot_c.c
@@ -2,6 +2,8 @@
 #include <io.h>
 #include <smram.h>
 
+#define INFO_SIGNATURE 0x5754454E
+
 extern char _binary_realmode_bin_start[];
 extern int _binary_realmode_bin_size;
 
@@ -23,9 +25,15 @@ struct mod_info
 	void *reserved;
 };
 
+struct info_section
+{
+	unsigned int signature;
+	void (*firstrun)();
+};
+
 void c_start(unsigned int magic, struct mb_info *info)
 {
-	struct mod_info *mods = mods;
+	struct mod_info *mods = info->mods;
 	unsigned short *grubptr = (unsigned short *)0x7CFE;
 	unsigned char smramc;
 	int i;
@@ -78,11 +86,19 @@ void c_start(unsigned int magic, struct mb_info *info)
 	else
 	{
 		load_elf(mods[0].mod_start, mods[0].mod_end - mods[0].mod_start);
-		smram_restore_state(old_smramc);
+
+		struct info_section * info = (struct info_section *)0x10000;
+		if (info->signature != INFO_SIGNATURE)
+		{
+			smram_restore_state(old_smramc);
+			puts("Info section signature mismatch.\n");
+		}
+		else {
+			info->firstrun();
+			smram_restore_state(old_smramc);
+		}
 	}
 
-	outb(0x830, inb(0x830) | 0x41);	/* turn on the SMIs we want */
-	
 	puts("Waiting for a bit before returning to real mode...");
 	for (i=0; i<0x500000; i++)
 	{
-- 
2.43.0