[patch] some debug statements

[Hollis Blanchard <hollis@penguinppc.org>]

This patch adds some useful debug statements I've been accumulating. It
uses the following debug categories: disk, mem, loader. I've already found the
dprintf infrastructure to be quite useful, albeit a little hard to read
with all the file paths and line numbers being output... ;)

I hope that as other people successfully debug other areas (like
"partition"), they will add more dprintf statements to facilitate future
remote debugging, because you know we're going to have a lot of it. :)

If this is acceptable I will check it in.

-Hollis

2005-06-23  Hollis Blanchard  <hollis@penguinppc.org>

	* disk/powerpc/ieee1275/ofdisk.c (grub_ofdisk_open): dprintf the
	device path and resulting ihandle.
	(grub_ofdisk_close): dprintf the ihandle being closed.
	(grub_ofdisk_read): dprintf function parameters.
	* kern/mm.c (grub_mm_init_region): Likewise.
	* loader/powerpc/ieee1275/linux.c (grub_linux_boot): dprintf the Linux
	entry point, initrd address and size, and boot arguments.
	(grub_rescue_cmd_linux): dprintf each ELF segment's address and size
	before loading into memory.
	(grub_rescue_cmd_initrd): dprintf the initrd's address and size
	before loading into memory.

Index: disk/powerpc/ieee1275/ofdisk.c
===================================================================
RCS file: /cvsroot/grub/grub2/disk/powerpc/ieee1275/ofdisk.c,v
retrieving revision 1.9
diff -u -p -w -r1.9 ofdisk.c
--- disk/powerpc/ieee1275/ofdisk.c	1 May 2005 03:45:35 -0000	1.9
+++ disk/powerpc/ieee1275/ofdisk.c	24 Jun 2005 01:54:31 -0000
@@ -63,6 +63,8 @@ grub_ofdisk_open (const char *name, grub
   if (! grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_NO_PARTITION_0))
     grub_strcat (devpath, ":0");
 
+  grub_dprintf ("disk", "Opening `%s'.\n", devpath);
+
   grub_ieee1275_open (devpath, &dev_ihandle);
   if (! dev_ihandle)
     {
@@ -70,6 +72,8 @@ grub_ofdisk_open (const char *name, grub
       goto fail;
     }
   
+  grub_dprintf ("disk", "Opened `%s' as handle 0x%x.\n", devpath, dev_ihandle);
+
   if (grub_ieee1275_finddevice (devpath, &dev))
     {
       grub_error (GRUB_ERR_UNKNOWN_DEVICE, "Can't read device properties");
@@ -112,6 +116,8 @@ grub_ofdisk_open (const char *name, grub
 static void
 grub_ofdisk_close (grub_disk_t disk)
 {
+  grub_dprintf ("disk", "Closing handle 0x%x.\n",
+		(grub_ieee1275_ihandle_t) disk->data);
   grub_ieee1275_close ((grub_ieee1275_ihandle_t) disk->data);
 }
 
@@ -123,6 +129,10 @@ grub_ofdisk_read (grub_disk_t disk, unsi
   int actual;
   unsigned long long pos;
 
+  grub_dprintf ("disk",
+		"Reading handle 0x%x: sector 0x%lx, size 0x%lx, buf %p.\n",
+		(grub_ieee1275_ihandle_t) disk->data, sector, size, buf);
+
   pos = (unsigned long long) sector * 512UL;
 
   grub_ieee1275_seek ((grub_ieee1275_ihandle_t) disk->data, (int) (pos >> 32),
Index: kern/mm.c
===================================================================
RCS file: /cvsroot/grub/grub2/kern/mm.c,v
retrieving revision 1.10
diff -u -p -w -r1.10 mm.c
--- kern/mm.c	23 Jun 2005 08:12:19 -0000	1.10
+++ kern/mm.c	24 Jun 2005 01:54:31 -0000
@@ -96,9 +96,7 @@ grub_mm_init_region (void *addr, grub_si
   grub_mm_header_t h;
   grub_mm_region_t r, *p, q;
 
-#if 0
-  grub_printf ("%s:%d: addr=%p, size=%u\n", __FILE__, __LINE__, addr, size);
-#endif
+  grub_dprintf ("mem", "addr=%p, size=%u\n", addr, size);
   
   /* If this region is too small, ignore it.  */
   if (size < GRUB_MM_ALIGN * 2)
Index: loader/powerpc/ieee1275/linux.c
===================================================================
RCS file: /cvsroot/grub/grub2/loader/powerpc/ieee1275/linux.c,v
retrieving revision 1.7
diff -u -p -w -r1.7 linux.c
--- loader/powerpc/ieee1275/linux.c	21 Jun 2005 02:33:51 -0000	1.7
+++ loader/powerpc/ieee1275/linux.c	24 Jun 2005 01:54:31 -0000
@@ -53,6 +53,12 @@ grub_linux_boot (void)
   grub_ieee1275_set_property (grub_ieee1275_chosen, "bootargs", linux_args,
 			      grub_strlen (linux_args) + 1, &actual);
   
+  grub_dprintf ("loader", "entry point: 0x%x\n", linux_addr);
+  grub_dprintf ("loader", "initrd at: 0x%x, size 0x%x\n", initrd_addr,
+		initrd_size);
+  grub_dprintf ("loader", "/chosen/bootargs: %s\n", linux_args);
+  grub_dprintf ("loader", "jumping to Linux...\n");
+
   /* Boot the kernel.  */
   linuxmain = (kernel_entry_t) linux_addr;
   linuxmain ((void *) initrd_addr, initrd_size, grub_ieee1275_entry_fn, 0, 0);
@@ -185,13 +191,18 @@ grub_rescue_cmd_linux (int argc, char *a
 
       if (phdr->p_type == PT_LOAD)
 	{
+	  void *segment_addr = ((char *) entry) + offset;
+
 	  if (grub_file_seek (file, phdr->p_offset) == -1)
 	    {
 	      grub_error (GRUB_ERR_BAD_OS, "Invalid offset in program header");
 	      goto fail;
 	    }
 	  
-	  if (grub_file_read (file, (void *) (((char *) entry) + offset) , phdr->p_filesz) 
+	  grub_dprintf ("loader", "Loading segment %d at %p, size 0x%x\n", i,
+			segment_addr, phdr->p_filesz);
+
+	  if (grub_file_read (file, segment_addr, phdr->p_filesz)
 	      != (grub_ssize_t) phdr->p_filesz)
 	    goto fail;
 	  
@@ -272,6 +283,8 @@ grub_rescue_cmd_initrd (int argc, char *
       goto fail;
     }
   
+  grub_dprintf ("loader", "Loading initrd at 0x%x, size 0x%x\n", addr, size);
+
   if (grub_file_read (file, (void *) addr, size) != size)
     {
       grub_ieee1275_release (addr, size);