Merge ../linus

[pandora-kernel.git] / arch / x86_64 / kernel / e820.c

diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
index 1bee318..9e94d83 100644 (file)
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -1,7 +1,6 @@
 /* 
  * Handle the memory map.
  * The functions here do the job until bootmem takes over.
- * $Id: e820.c,v 1.4 2002/09/19 19:25:32 ak Exp $
  *
  *  Getting sanitize_e820_map() in sync with i386 version by applying change:
  *  -  Provisions for empty E820 memory regions (reported by certain BIOSes).
@@ -76,10 +75,20 @@ static inline int bad_addr(unsigned long *addrp, unsigned long size)
                *addrp = __pa_symbol(&_end);
                return 1;
        }
+
+       if (last >= ebda_addr && addr < ebda_addr + ebda_size) {
+               *addrp = ebda_addr + ebda_size;
+               return 1;
+       }
+
        /* XXX ramdisk image here? */ 
        return 0;
 } 
 
+/*
+ * This function checks if any part of the range <start,end> is mapped
+ * with type.
+ */
 int __meminit
 e820_any_mapped(unsigned long start, unsigned long end, unsigned type)
 { 
@@ -95,6 +104,35 @@ e820_any_mapped(unsigned long start, unsigned long end, unsigned type)
        return 0;
 }
 
+/*
+ * This function checks if the entire range <start,end> is mapped with type.
+ *
+ * Note: this function only works correct if the e820 table is sorted and
+ * not-overlapping, which is the case
+ */
+int __init e820_all_mapped(unsigned long start, unsigned long end, unsigned type)
+{
+       int i;
+       for (i = 0; i < e820.nr_map; i++) {
+               struct e820entry *ei = &e820.map[i];
+               if (type && ei->type != type)
+                       continue;
+               /* is the region (part) in overlap with the current region ?*/
+               if (ei->addr >= end || ei->addr + ei->size <= start)
+                       continue;
+
+               /* if the region is at the beginning of <start,end> we move
+                * start to the end of the region since it's ok until there
+                */
+               if (ei->addr <= start)
+                       start = ei->addr + ei->size;
+               /* if start is now at or beyond end, we're done, full coverage */
+               if (start >= end)
+                       return 1; /* we're done */
+       }
+       return 0;
+}
+
 /* 
  * Find a free area in a specific range. 
  */ 
@@ -110,7 +148,7 @@ unsigned long __init find_e820_area(unsigned long start, unsigned long end, unsi
                        addr = start;
                if (addr > ei->addr + ei->size) 
                        continue; 
-               while (bad_addr(&addr, size) && addr+size < ei->addr + ei->size)
+               while (bad_addr(&addr, size) && addr+size <= ei->addr+ei->size)
                        ;
                last = addr + size;
                if (last > ei->addr + ei->size)
@@ -582,6 +620,7 @@ void __init parse_memmapopt(char *p, char **from)
 }
 
 unsigned long pci_mem_start = 0xaeedbabe;
+EXPORT_SYMBOL(pci_mem_start);
 
 /*
  * Search for the biggest gap in the low 32 bits of the e820