[PATCH] i386: Move find_max_pfn function to e820.c

Move more code from setup.c into e820.c

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 52 insertions, 0 deletions

diff --git a/arch/i386/kernel/e820.c b/arch/i386/kernel/e820.c
index 0db95760b073..be4934f6f85b 100644
--- a/arch/i386/kernel/e820.c
+++ b/arch/i386/kernel/e820.c
@@ -8,6 +8,7 @@
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/efi.h>
+#include <linux/pfn.h>
 
 #include <asm/pgtable.h>
 #include <asm/page.h>
@@ -539,3 +540,54 @@ int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
         return 0;
 }
 
+/*
+ * Callback for efi_memory_walk.
+ */
+static int __init
+efi_find_max_pfn(unsigned long start, unsigned long end, void *arg)
+{
+        unsigned long *max_pfn = arg, pfn;
+
+        if (start < end) {
+                pfn = PFN_UP(end -1);
+                if (pfn > *max_pfn)
+                        *max_pfn = pfn;
+        }
+        return 0;
+}
+
+static int __init
+efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg)
+{
+        memory_present(0, PFN_UP(start), PFN_DOWN(end));
+        return 0;
+}
+
+/*
+ * Find the highest page frame number we have available
+ */
+void __init find_max_pfn(void)
+{
+        int i;
+
+        max_pfn = 0;
+        if (efi_enabled) {
+                efi_memmap_walk(efi_find_max_pfn, &max_pfn);
+                efi_memmap_walk(efi_memory_present_wrapper, NULL);
+                return;
+        }
+
+        for (i = 0; i < e820.nr_map; i++) {
+                unsigned long start, end;
+                /* RAM? */
+                if (e820.map[i].type != E820_RAM)
+                        continue;
+                start = PFN_UP(e820.map[i].addr);
+                end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
+                if (start >= end)
+                        continue;
+                if (end > max_pfn)
+                        max_pfn = end;
+                memory_present(0, start, end);
+        }
+}