From b57247e8aa760d448f0704520da1e0f82a881250 Mon Sep 17 00:00:00 2001
From: Ali Mashtizadeh <mashti@uwaterloo.ca>
Date: Tue, 28 Nov 2023 23:42:11 -0500
Subject: [PATCH] Print usage in kernel debugger for pci, debug and disk
 functions.

---
 sys/dev/pci.c    | 1 +
 sys/kern/debug.c | 6 ++++--
 sys/kern/disk.c  | 3 ++-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/sys/dev/pci.c b/sys/dev/pci.c
index fec4cb8..500765a 100644
--- a/sys/dev/pci.c
+++ b/sys/dev/pci.c
@@ -397,6 +397,7 @@ Debug_PCIDump(int argc, const char *argv[])
     uint32_t bar;
 
     if (argc != 4) {
+	kprintf("pcidump requires 3 arguments!\n");
         kprintf("Usage: pcidump <bus> <device> <func>\n");
         return;
     }
diff --git a/sys/kern/debug.c b/sys/kern/debug.c
index 95aa9e3..8a186f6 100644
--- a/sys/kern/debug.c
+++ b/sys/kern/debug.c
@@ -208,7 +208,8 @@ Debug_Dump(int argc, const char *argv[])
 
     if (argc != 3)
     {
-	kprintf("Dump requires 3 arguments\n");
+	kprintf("dump requires 2 arguments!\n");
+	kprintf("Usage: dump <off> <len>\n");
 	return;
     }
 
@@ -227,7 +228,8 @@ Debug_Disasm(int argc, const char *argv[])
     int len = 1;
 
     if (argc != 2 && argc != 3) {
-	kprintf("Disasm requires 2 or 3 arguments\n");
+	kprintf("disasm requires 1 or 2 arguments!\n");
+	kprintf("Usage: disasm <off> [<len>]\n");
 	return;
     }
 
diff --git a/sys/kern/disk.c b/sys/kern/disk.c
index e594c64..c3be235 100644
--- a/sys/kern/disk.c
+++ b/sys/kern/disk.c
@@ -80,7 +80,8 @@ Debug_DumpDisk(int argc, const char *argv[])
     SGArray sga;
 
     if (argc != 4) {
-	kprintf("dumpdisk requires 4 arguments!\n");
+	kprintf("dumpdisk requires 3 arguments\n");
+	kprintf("Usage: dumpdisk <ctrl> <disk> <sector>\n");
 	return;
     }