linux-kernel - [PATCH 2.6.19-rc5-git2] EFI: mapping memory region of runtime services when using memmap kernel parameter

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Date:	Mon, 13 Nov 2006 13:08:50 +0200
From:	"Myaskouvskey, Artiom" <artiom.myaskouvskey@...el.com>
To:	"davej@...emonkey.org.uk" <'davej@...emonkey.org.uk'>,
	"hpa@...or.com" <'hpa@...or.com'>
Cc:	"linux-kernel@...r.kernel.org" <'linux-kernel@...r.kernel.org'>,
	"Satt, Shai" <shai.satt@...el.com>
Subject: [PATCH 2.6.19-rc5-git2]  EFI: mapping memory region of runtime services when using memmap kernel parameter

From: Artiom Myaskouvskey <artiom.myaskouvskey@...el.com>
 
When using memmap kernel parameter in EFI boot we should also add to memory map 
memory regions of runtime services to enable their mapping later.

Signed-off-by: Artiom Myaskouvskey <artiom.myaskouvskey@...el.com>
---

diff -uprN linux-2.6.19-rc5-git2.orig/arch/i386/kernel/setup.c linux-2.6.19-rc5-git2/arch/i386/kernel/setup.c
--- linux-2.6.19-rc5-git2.orig/arch/i386/kernel/setup.c	2006-11-13 11:15:17.000000000 +0200
+++ linux-2.6.19-rc5-git2/arch/i386/kernel/setup.c	2006-11-13 11:15:42.000000000 +0200
@@ -346,28 +346,44 @@ static void __init probe_roms(void)
 	}
 }
 
+extern int is_available_memory(efi_memory_desc_t * md);
+
 static void __init limit_regions(unsigned long long size)
 {
 	unsigned long long current_addr = 0;
-	int i;
+	int i , j;
 
-	if (efi_enabled) {
-		efi_memory_desc_t *md;
-		void *p;
+	if (efi_enabled) {		
+		efi_memory_desc_t *md, *next_md = 0;
+		void *p, *p1;
 
-		for (p = memmap.map, i = 0; p < memmap.map_end;
+		for (p = memmap.map, i = 0,j = 0, p1 = memmap.map; p < memmap.map_end;
 			p += memmap.desc_size, i++) {
 			md = p;
+			next_md = p1;
 			current_addr = md->phys_addr + (md->num_pages << 12);
-			if (md->type == EFI_CONVENTIONAL_MEMORY) {
-				if (current_addr >= size) {
-					md->num_pages -=
-						(((current_addr-size) + PAGE_SIZE-1) >> PAGE_SHIFT);
-					memmap.nr_map = i + 1;
-					return;
+			if (is_available_memory(md)) {
+				if (md->phys_addr >= size) continue;
+				memcpy(next_md, md, memmap.desc_size);				
+                                if (current_addr >= size) {
+					next_md->num_pages -= (((current_addr-size) + PAGE_SIZE-1) >> PAGE_SHIFT);
 				}
+				p1 += memmap.desc_size;
+				next_md = p1;
+				j++;
 			}
-		}
+			else if ((md->attribute & EFI_MEMORY_RUNTIME) == EFI_MEMORY_RUNTIME) {
+				/* In order to make runtime services available we have to include runtime 
+				 * memory regions in memory map */
+				memcpy(next_md, md, memmap.desc_size);
+				p1 += memmap.desc_size;
+				next_md = p1;
+				j++;
+			}		
+		}
+		memmap.nr_map = j;
+		memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
+                return;
 	}
 	for (i = 0; i < e820.nr_map; i++) {
 		current_addr = e820.map[i].addr + e820.map[i].size;
-
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