[PATCH] x86_64: Introduce e820_all_mapped

Introduce a e820_all_mapped() function which checks if the entire range
<start,end> is mapped with type.

This is done by moving the local start variable to the end of each
known-good region; if at the end of the function the start address is
still before end, there must be a part that's not of the correct type;
otherwise it's a good region.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 5 insertions, 0 deletions

diff --git a/include/asm-i386/e820.h b/include/asm-i386/e820.h
index edf65be21a92..ca82acb8cb1f 100644
--- a/include/asm-i386/e820.h
+++ b/include/asm-i386/e820.h
@@ -35,6 +35,10 @@ struct e820map {
 };
 
 extern struct e820map e820;
+
+extern int e820_all_mapped(unsigned long start, unsigned long end,
+                           unsigned type);
+
 #endif/*!__ASSEMBLY__*/
 
 #endif/*__E820_HEADER*/
diff --git a/include/asm-x86_64/e820.h b/include/asm-x86_64/e820.h
index 4192d0ef093b..93b51df51687 100644
--- a/include/asm-x86_64/e820.h
+++ b/include/asm-x86_64/e820.h
@@ -48,6 +48,7 @@ extern unsigned long e820_end_of_ram(void);
 extern void e820_reserve_resources(void);
 extern void e820_print_map(char *who);
 extern int e820_any_mapped(unsigned long start, unsigned long end, unsigned type);
+extern int e820_all_mapped(unsigned long start, unsigned long end, unsigned type);
 
 extern void e820_bootmem_free(pg_data_t *pgdat, unsigned long start,unsigned long end);
 extern void e820_setup_gap(void);