From 6a7fb94bfb1e94c41d05d2f3c7d3fc611da1c90b Mon Sep 17 00:00:00 2001
From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
Date: Mon, 25 Mar 2013 10:23:04 +0100
Subject: [PATCH] 	Replace the region at 0 from coreboot tables to
 available in BSD 	memory map.

---
 ChangeLog                           |  5 +++++
 grub-core/commands/lsmmap.c         |  1 +
 grub-core/kern/i386/coreboot/mmap.c |  6 +++++-
 grub-core/loader/i386/bsd.c         | 13 +++++++++++--
 grub-core/mmap/mmap.c               |  1 +
 include/grub/memory.h               |  1 +
 6 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 981991bd7..8425aff66 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2013-03-25  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	Replace the region at 0 from coreboot tables to available in BSD
+	memory map.
+
 2013-03-24  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* util/grub.d/20_linux_xen.in: Automatically add no-real-mode edd=off on
diff --git a/grub-core/commands/lsmmap.c b/grub-core/commands/lsmmap.c
index c1a05d829..0d298559c 100644
--- a/grub-core/commands/lsmmap.c
+++ b/grub-core/commands/lsmmap.c
@@ -37,6 +37,7 @@ static const char *names[] =
        is required to save accross hibernations.  */
     [GRUB_MEMORY_NVS] = N_("ACPI non-volatile storage RAM"),
     [GRUB_MEMORY_BADRAM] = N_("faulty RAM (BadRAM)"),
+    [GRUB_MEMORY_COREBOOT_TABLES] = N_("RAM holding coreboot tables"),
     [GRUB_MEMORY_CODE] = N_("RAM holding firmware code"),
     [GRUB_MEMORY_HOLE] = N_("Address range not associated with RAM")
   };
diff --git a/grub-core/kern/i386/coreboot/mmap.c b/grub-core/kern/i386/coreboot/mmap.c
index 6a14d2910..0aade62e1 100644
--- a/grub-core/kern/i386/coreboot/mmap.c
+++ b/grub-core/kern/i386/coreboot/mmap.c
@@ -86,6 +86,8 @@ struct grub_machine_mmap_iterate_ctx
   void *hook_data;
 };
 
+#define GRUB_MACHINE_MEMORY_BADRAM 	5
+
 /* Helper for grub_machine_mmap_iterate.  */
 static int
 iterate_linuxbios_table (grub_linuxbios_table_item_t table_item, void *data)
@@ -105,7 +107,9 @@ iterate_linuxbios_table (grub_linuxbios_table_item_t table_item, void *data)
 		     /* Multiboot mmaps match with the coreboot mmap
 		        definition.  Therefore, we can just pass type
 		        through.  */
-		     mem_region->type, ctx->hook_data))
+		     (((mem_region->type <= GRUB_MACHINE_MEMORY_BADRAM) && (mem_region->type >= GRUB_MACHINE_MEMORY_AVAILABLE))
+		      || mem_region->type == GRUB_MEMORY_COREBOOT_TABLES) ? mem_region->type : GRUB_MEMORY_RESERVED,
+		     ctx->hook_data))
 	return 1;
 
       mem_region++;
diff --git a/grub-core/loader/i386/bsd.c b/grub-core/loader/i386/bsd.c
index e89ec2690..5fe586fd1 100644
--- a/grub-core/loader/i386/bsd.c
+++ b/grub-core/loader/i386/bsd.c
@@ -268,6 +268,7 @@ struct grub_e820_mmap
 #define GRUB_E820_ACPI       3
 #define GRUB_E820_NVS        4
 #define GRUB_E820_BADRAM     5
+#define GRUB_E820_COREBOOT_TABLES 0x10
 
 /* Context for generate_e820_mmap.  */
 struct generate_e820_mmap_ctx
@@ -299,13 +300,21 @@ generate_e820_mmap_iter (grub_uint64_t addr, grub_uint64_t size,
     case GRUB_MEMORY_NVS:
       ctx->cur.type = GRUB_E820_NVS;
       break;
-
+    case GRUB_MEMORY_COREBOOT_TABLES:
+      /* Nowadays the tables at 0 don't contain anything important but
+       *BSD needs the memory at 0 for own needs.
+       */
+      if (addr == 0)
+	ctx->cur.type = GRUB_E820_RAM;
+      else
+	ctx->cur.type = GRUB_E820_COREBOOT_TABLES;
+      break;
     default:
     case GRUB_MEMORY_CODE:
     case GRUB_MEMORY_RESERVED:
       ctx->cur.type = GRUB_E820_RESERVED;
       break;
-    }
+    }  
 
   /* Merge regions if possible. */
   if (ctx->count && ctx->cur.type == ctx->prev.type
diff --git a/grub-core/mmap/mmap.c b/grub-core/mmap/mmap.c
index 40ffb2e51..d8bd8d2e6 100644
--- a/grub-core/mmap/mmap.c
+++ b/grub-core/mmap/mmap.c
@@ -47,6 +47,7 @@ static const int priority[] =
   [GRUB_MEMORY_AVAILABLE] = 1,
   [GRUB_MEMORY_RESERVED] = 3,
   [GRUB_MEMORY_ACPI] = 2,
+  [GRUB_MEMORY_COREBOOT_TABLES] = 2,
   [GRUB_MEMORY_CODE] = 3,
   [GRUB_MEMORY_NVS] = 3,
   [GRUB_MEMORY_HOLE] = 4,
diff --git a/include/grub/memory.h b/include/grub/memory.h
index 3311fcb94..0df807424 100644
--- a/include/grub/memory.h
+++ b/include/grub/memory.h
@@ -30,6 +30,7 @@ typedef enum grub_memory_type
     GRUB_MEMORY_ACPI = 3,
     GRUB_MEMORY_NVS = 4,
     GRUB_MEMORY_BADRAM = 5,
+    GRUB_MEMORY_COREBOOT_TABLES = 16,
     GRUB_MEMORY_CODE = 20,
     /* This one is special: it's used internally but is never reported
        by firmware. */