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-rw-r--r--arch/x86/mm/ioremap.c37
1 files changed, 0 insertions, 37 deletions
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index c246d259822..e404ffe3021 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -24,43 +24,6 @@
24 24
25#include "physaddr.h" 25#include "physaddr.h"
26 26
27int page_is_ram(unsigned long pagenr)
28{
29 resource_size_t addr, end;
30 int i;
31
32 /*
33 * A special case is the first 4Kb of memory;
34 * This is a BIOS owned area, not kernel ram, but generally
35 * not listed as such in the E820 table.
36 */
37 if (pagenr == 0)
38 return 0;
39
40 /*
41 * Second special case: Some BIOSen report the PC BIOS
42 * area (640->1Mb) as ram even though it is not.
43 */
44 if (pagenr >= (BIOS_BEGIN >> PAGE_SHIFT) &&
45 pagenr < (BIOS_END >> PAGE_SHIFT))
46 return 0;
47
48 for (i = 0; i < e820.nr_map; i++) {
49 /*
50 * Not usable memory:
51 */
52 if (e820.map[i].type != E820_RAM)
53 continue;
54 addr = (e820.map[i].addr + PAGE_SIZE-1) >> PAGE_SHIFT;
55 end = (e820.map[i].addr + e820.map[i].size) >> PAGE_SHIFT;
56
57
58 if ((pagenr >= addr) && (pagenr < end))
59 return 1;
60 }
61 return 0;
62}
63
64/* 27/*
65 * Fix up the linear direct mapping of the kernel to avoid cache attribute 28 * Fix up the linear direct mapping of the kernel to avoid cache attribute
66 * conflicts. 29 * conflicts.