[1915] 2008-11-14 Robert Millan <[email protected]>

Revision: 1915
          http://svn.sv.gnu.org/viewvc/?view=rev&root=grub&revision=1915
Author:   robertmh
Date:     2008-11-14 19:04:26 +0000 (Fri, 14 Nov 2008)

Log Message:
-----------
2008-11-14  Robert Millan  <[email protected]>

        * include/grub/i386/coreboot/memory.h (GRUB_MEMORY_MACHINE_LOWER_SIZE):
        Redefine to match with GRUB_MEMORY_MACHINE_UPPER_START (0x100000).  We
        don't want to mess with lower memory, because it is used in the Linux
        loader.

        * loader/i386/linux.c (allocate_pages): Allocate `real_mode_mem' in
        an appropiate place in lower memory, between 0x10000 and 0x90000,
        like loader/i386/efi/linux.c does.  Linux often panics if real_mode_mem
        is in our heap (probably as a result of it being corrupted during
        decompression).

Modified Paths:
--------------
    trunk/grub2/ChangeLog
    trunk/grub2/include/grub/i386/coreboot/memory.h
    trunk/grub2/loader/i386/linux.c

Modified: trunk/grub2/ChangeLog
===================================================================
--- trunk/grub2/ChangeLog	2008-11-14 17:57:39 UTC (rev 1914)
+++ trunk/grub2/ChangeLog	2008-11-14 19:04:26 UTC (rev 1915)
@@ -1,5 +1,18 @@
 2008-11-14  Robert Millan  <[email protected]>
 
+	* include/grub/i386/coreboot/memory.h (GRUB_MEMORY_MACHINE_LOWER_SIZE):
+	Redefine to match with GRUB_MEMORY_MACHINE_UPPER_START (0x100000).  We
+	don't want to mess with lower memory, because it is used in the Linux
+	loader.
+
+	* loader/i386/linux.c (allocate_pages): Allocate `real_mode_mem' in
+	an appropiate place in lower memory, between 0x10000 and 0x90000,
+	like loader/i386/efi/linux.c does.  Linux often panics if real_mode_mem
+	is in our heap (probably as a result of it being corrupted during
+	decompression).
+
+2008-11-14  Robert Millan  <[email protected]>
+
 	* term/i386/pc/serial.c [! GRUB_MACHINE_PCBIOS]
 	(GRUB_SERIAL_PORT_NUM): Fix misscalculation.
 

Modified: trunk/grub2/include/grub/i386/coreboot/memory.h
===================================================================
--- trunk/grub2/include/grub/i386/coreboot/memory.h	2008-11-14 17:57:39 UTC (rev 1914)
+++ trunk/grub2/include/grub/i386/coreboot/memory.h	2008-11-14 19:04:26 UTC (rev 1915)
@@ -28,9 +28,9 @@
 #endif
 
 #define GRUB_MEMORY_MACHINE_LOWER_USABLE		0x9fc00		/* 640 kiB - 1 kiB */
-#define GRUB_MEMORY_MACHINE_LOWER_SIZE			0xf0000		/* 960 kiB */
 
 #define GRUB_MEMORY_MACHINE_UPPER_START			0x100000	/* 1 MiB */
+#define GRUB_MEMORY_MACHINE_LOWER_SIZE			GRUB_MEMORY_MACHINE_UPPER_START
 
 #ifndef ASM_FILE
 

Modified: trunk/grub2/loader/i386/linux.c
===================================================================
--- trunk/grub2/loader/i386/linux.c	2008-11-14 17:57:39 UTC (rev 1914)
+++ trunk/grub2/loader/i386/linux.c	2008-11-14 19:04:26 UTC (rev 1915)
@@ -142,23 +142,40 @@
   real_mode_mem = 0;
   prot_mode_mem = 0;
   
-  real_mode_mem = grub_malloc (real_mode_pages << 12);
-  
+  auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
+  int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size, grub_uint32_t type)
+    {
+      /* We must put real mode code in the traditional space.  */
+
+      if (type == GRUB_MACHINE_MEMORY_AVAILABLE
+	  && addr <= 0x90000)
+	{
+	  if (addr < 0x10000)
+	    {
+	      size += addr - 0x10000;
+	      addr = 0x10000;
+	    }
+
+	  if (addr + size > 0x90000)
+	    size = 0x90000 - addr;
+
+	  if (real_size + mmap_size > size)
+	    return 0;
+
+	  real_mode_mem = (addr + size) - (real_size + mmap_size);
+	  return 1;
+	}
+
+      return 0;
+    }
+  grub_machine_mmap_iterate (hook);
   if (! real_mode_mem)
     {
       grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate real mode pages");
       goto fail;
     }
 
-  /* Next, find free pages for the protected mode code.  */
-  /* XXX what happens if anything is using this address?  */
   prot_mode_mem = (void *) 0x100000;
-  if (! prot_mode_mem)
-    {
-      grub_error (GRUB_ERR_OUT_OF_MEMORY,
-		  "cannot allocate protected mode pages");
-      goto fail;
-    }
 
   grub_dprintf ("linux", "real_mode_mem = %lx, real_mode_pages = %x, "
                 "prot_mode_mem = %lx, prot_mode_pages = %x\n",