1 files changed, 40 insertions, 24 deletions

diff --git a/arch/i386/kernel/e820.c b/arch/i386/kernel/e820.c
index 70f39560846a..9645bb51f76a 100644
--- a/arch/i386/kernel/e820.c
+++ b/arch/i386/kernel/e820.c
@@ -161,26 +161,27 @@ static struct resource standard_io_resources[] = { {
 
 static int __init romsignature(const unsigned char *rom)
 {
+        const unsigned short * const ptr = (const unsigned short *)rom;
         unsigned short sig;
 
-        return probe_kernel_address((const unsigned short *)rom, sig) == 0 &&
-               sig == ROMSIGNATURE;
+        return probe_kernel_address(ptr, sig) == 0 && sig == ROMSIGNATURE;
 }
 
-static int __init romchecksum(unsigned char *rom, unsigned long length)
+static int __init romchecksum(const unsigned char *rom, unsigned long length)
 {
-        unsigned char sum;
+        unsigned char sum, c;
 
-        for (sum = 0; length; length--)
-                sum += *rom++;
-        return sum == 0;
+        for (sum = 0; length && probe_kernel_address(rom++, c) == 0; length--)
+                sum += c;
+        return !length && !sum;
 }
 
 static void __init probe_roms(void)
 {
+        const unsigned char *rom;
         unsigned long start, length, upper;
-        unsigned char *rom;
-        int           i;
+        unsigned char c;
+        int i;
 
         /* video rom */
         upper = adapter_rom_resources[0].start;
@@ -191,8 +192,11 @@ static void __init probe_roms(void)
 
                 video_rom_resource.start = start;
 
+                if (probe_kernel_address(rom + 2, c) != 0)
+                        continue;
+
                 /* 0 < length <= 0x7f * 512, historically */
-                length = rom[2] * 512;
+                length = c * 512;
 
                 /* if checksum okay, trust length byte */
                 if (length && romchecksum(rom, length))
@@ -226,8 +230,11 @@ static void __init probe_roms(void)
                 if (!romsignature(rom))
                         continue;
 
+                if (probe_kernel_address(rom + 2, c) != 0)
+                        continue;
+
                 /* 0 < length <= 0x7f * 512, historically */
-                length = rom[2] * 512;
+                length = c * 512;
 
                 /* but accept any length that fits if checksum okay */
                 if (!length || start + length > upper || !romchecksum(rom, length))
@@ -386,10 +393,8 @@ int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
                    ____________________33__
                    ______________________4_
         */
-        printk("sanitize start\n");
         /* if there's only one memory region, don't bother */
         if (*pnr_map < 2) {
-                printk("sanitize bail 0\n");
                 return -1;
         }
 
@@ -398,7 +403,6 @@ int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
         /* bail out if we find any unreasonable addresses in bios map */
         for (i=0; i<old_nr; i++)
                 if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr) {
-                        printk("sanitize bail 1\n");
                         return -1;
                 }
 
@@ -494,7 +498,6 @@ int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
         memcpy(biosmap, new_bios, new_nr*sizeof(struct e820entry));
         *pnr_map = new_nr;
 
-        printk("sanitize end\n");
         return 0;
 }
 
@@ -525,7 +528,6 @@ int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
                 unsigned long long size = biosmap->size;
                 unsigned long long end = start + size;
                 unsigned long type = biosmap->type;
-                printk("copy_e820_map() start: %016Lx size: %016Lx end: %016Lx type: %ld\n", start, size, end, type);
 
                 /* Overflow in 64 bits? Ignore the memory map. */
                 if (start > end)
@@ -536,17 +538,11 @@ int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
                  * Not right. Fix it up.
                  */
                 if (type == E820_RAM) {
-                        printk("copy_e820_map() type is E820_RAM\n");
                         if (start < 0x100000ULL && end > 0xA0000ULL) {
-                                printk("copy_e820_map() lies in range...\n");
-                                if (start < 0xA0000ULL) {
-                                        printk("copy_e820_map() start < 0xA0000ULL\n");
+                                if (start < 0xA0000ULL)
                                         add_memory_region(start, 0xA0000ULL-start, type);
-                                }
-                                if (end <= 0x100000ULL) {
-                                        printk("copy_e820_map() end <= 0x100000ULL\n");
+                                if (end <= 0x100000ULL)
                                         continue;
-                                }
                                 start = 0x100000ULL;
                                 size = end - start;
                         }
@@ -818,6 +814,26 @@ void __init limit_regions(unsigned long long size)
         print_memory_map("limit_regions endfunc");
 }
 
+/*
+ * This function checks if any part of the range <start,end> is mapped
+ * with type.
+ */
+int
+e820_any_mapped(u64 start, u64 end, unsigned type)
+{
+        int i;
+        for (i = 0; i < e820.nr_map; i++) {
+                const struct e820entry *ei = &e820.map[i];
+                if (type && ei->type != type)
+                        continue;
+                if (ei->addr >= end || ei->addr + ei->size <= start)
+                        continue;
+                return 1;
+        }
+        return 0;
+}
+EXPORT_SYMBOL_GPL(e820_any_mapped);
+
  /*
   * This function checks if the entire range <start,end> is mapped with type.
   *