X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=arch%2Fx86%2Fkernel%2Fe820_32.c;h=ed733e7cf4e611c454f9ea622c9322919aa624b4;hb=a1a33fa315b8a5a390f1132681485209500ff5b5;hp=4e16ef4a2659f38f18d613289527f415d9ad92f1;hpb=6e5565f949af1322f8f3d3f43d044645ae448499;p=linux-2.6

diff --git a/arch/x86/kernel/e820_32.c b/arch/x86/kernel/e820_32.c
index 4e16ef4a26..ed733e7cf4 100644
--- a/arch/x86/kernel/e820_32.c
+++ b/arch/x86/kernel/e820_32.c
@@ -450,45 +450,32 @@ int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
  * thinkpad 560x, for example, does not cooperate with the memory
  * detection code.)
  */
-int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
+int __init copy_e820_map(struct e820entry *biosmap, int nr_map)
 {
 	/* Only one memory region (or negative)? Ignore it */
 	if (nr_map < 2)
 		return -1;
 
 	do {
-		unsigned long long start = biosmap->addr;
-		unsigned long long size = biosmap->size;
-		unsigned long long end = start + size;
-		unsigned long type = biosmap->type;
+		u64 start = biosmap->addr;
+		u64 size = biosmap->size;
+		u64 end = start + size;
+		u32 type = biosmap->type;
 
 		/* Overflow in 64 bits? Ignore the memory map. */
 		if (start > end)
 			return -1;
 
-		/*
-		 * Some BIOSes claim RAM in the 640k - 1M region.
-		 * Not right. Fix it up.
-		 */
-		if (type == E820_RAM) {
-			if (start < 0x100000ULL && end > 0xA0000ULL) {
-				if (start < 0xA0000ULL)
-					add_memory_region(start, 0xA0000ULL-start, type);
-				if (end <= 0x100000ULL)
-					continue;
-				start = 0x100000ULL;
-				size = end - start;
-			}
-		}
 		add_memory_region(start, size, type);
-	} while (biosmap++,--nr_map);
+	} while (biosmap++, --nr_map);
+
 	return 0;
 }
 
 /*
  * Find the highest page frame number we have available
  */
-void __init find_max_pfn(void)
+void __init propagate_e820_map(void)
 {
 	int i;
 
@@ -717,7 +704,7 @@ static int __init parse_memmap(char *arg)
 		 * size before original memory map is
 		 * reset.
 		 */
-		find_max_pfn();
+		propagate_e820_map();
 		saved_max_pfn = max_pfn;
 #endif
 		e820.nr_map = 0;
@@ -749,6 +736,32 @@ static int __init parse_memmap(char *arg)
 	return 0;
 }
 early_param("memmap", parse_memmap);
+void __init update_memory_range(u64 start, u64 size, unsigned old_type,
+				unsigned new_type)
+{
+	int i;
+
+	BUG_ON(old_type == new_type);
+
+	for (i = 0; i < e820.nr_map; i++) {
+		struct e820entry *ei = &e820.map[i];
+		u64 final_start, final_end;
+		if (ei->type != old_type)
+			continue;
+		/* totally covered? */
+		if (ei->addr >= start && ei->size <= size) {
+			ei->type = new_type;
+			continue;
+		}
+		/* partially covered */
+		final_start = max(start, ei->addr);
+		final_end = min(start + size, ei->addr + ei->size);
+		if (final_start >= final_end)
+			continue;
+		add_memory_region(final_start, final_end - final_start,
+					 new_type);
+	}
+}
 void __init update_e820(void)
 {
 	u8 nr_map;