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-rw-r--r--arch/x86/kernel/cpu/mtrr/main.c3
-rw-r--r--arch/x86/kernel/e820_32.c26
-rw-r--r--arch/x86/kernel/e820_64.c27
3 files changed, 55 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index be83336fddba..a6450b3ae759 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -711,7 +711,8 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
trim_size = end_pfn;
trim_size <<= PAGE_SHIFT;
trim_size -= trim_start;
- add_memory_region(trim_start, trim_size, E820_RESERVED);
+ update_memory_range(trim_start, trim_size, E820_RAM,
+ E820_RESERVED);
update_e820();
return 1;
}
diff --git a/arch/x86/kernel/e820_32.c b/arch/x86/kernel/e820_32.c
index 4e16ef4a2659..80444c5c9b14 100644
--- a/arch/x86/kernel/e820_32.c
+++ b/arch/x86/kernel/e820_32.c
@@ -749,6 +749,32 @@ 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;
diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
index 9f65b4cc323c..9be697126013 100644
--- a/arch/x86/kernel/e820_64.c
+++ b/arch/x86/kernel/e820_64.c
@@ -744,6 +744,33 @@ void __init finish_e820_parsing(void)
}
}
+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;