1 files changed, 56 insertions, 62 deletions

diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
index 708a3cd9a27e..c0af3828df45 100644
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -25,6 +25,8 @@
 #include <asm/bootsetup.h>
 #include <asm/sections.h>
 
+struct e820map e820 __initdata;
+
 /* 
  * PFN of last memory page.
  */
@@ -41,7 +43,7 @@ unsigned long end_pfn_map;
 /* 
  * Last pfn which the user wants to use.
  */
-unsigned long end_user_pfn = MAXMEM>>PAGE_SHIFT;  
+static unsigned long __initdata end_user_pfn = MAXMEM>>PAGE_SHIFT;
 
 extern struct resource code_resource, data_resource;
 
@@ -70,12 +72,7 @@ static inline int bad_addr(unsigned long *addrp, unsigned long size)
                 return 1;
         } 
 #endif
-        /* kernel code + 640k memory hole (later should not be needed, but 
-           be paranoid for now) */
-        if (last >= 640*1024 && addr < 1024*1024) {
-                *addrp = 1024*1024;
-                return 1;
-        }
+        /* kernel code */
         if (last >= __pa_symbol(&_text) && last < __pa_symbol(&_end)) {
                 *addrp = __pa_symbol(&_end);
                 return 1;
@@ -565,13 +562,6 @@ static int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
  * If we're lucky and live on a modern system, the setup code
  * will have given us a memory map that we can use to properly
  * set up memory.  If we aren't, we'll fake a memory map.
- *
- * We check to see that the memory map contains at least 2 elements
- * before we'll use it, because the detection code in setup.S may
- * not be perfect and most every PC known to man has two memory
- * regions: one from 0 to 640k, and one from 1mb up.  (The IBM
- * thinkpad 560x, for example, does not cooperate with the memory
- * detection code.)
  */
 static int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
 {
@@ -589,34 +579,19 @@ static int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
                 if (start > end)
                         return -1;
 
-                /*
-                 * Some BIOSes claim RAM in the 640k - 1M region.
-                 * Not right. Fix it up.
-                 * 
-                 * This should be removed on Hammer which is supposed to not
-                 * have non e820 covered ISA mappings there, but I had some strange
-                 * problems so it stays for now.  -AK
-                 */
-                if (type == E820_RAM) {
-                        if (start < 0x100000ULL && end > 0xA0000ULL) {
-                                if (start < 0xA0000ULL)
-                                        add_memory_region(start, 0xA0000ULL-start, type);
-                                if (end <= 0x100000ULL)
-                                        continue;
-                                start = 0x100000ULL;
-                                size = end - start;
-                        }
-                }
-
                 add_memory_region(start, size, type);
         } while (biosmap++,--nr_map);
         return 0;
 }
 
-void __init setup_memory_region(void)
+void early_panic(char *msg)
 {
-        char *who = "BIOS-e820";
+        early_printk(msg);
+        panic(msg);
+}
 
+void __init setup_memory_region(void)
+{
         /*
          * Try to copy the BIOS-supplied E820-map.
          *
@@ -624,51 +599,70 @@ void __init setup_memory_region(void)
          * the next section from 1mb->appropriate_mem_k
          */
         sanitize_e820_map(E820_MAP, &E820_MAP_NR);
-        if (copy_e820_map(E820_MAP, E820_MAP_NR) < 0) {
-                unsigned long mem_size;
-
-                /* compare results from other methods and take the greater */
-                if (ALT_MEM_K < EXT_MEM_K) {
-                        mem_size = EXT_MEM_K;
-                        who = "BIOS-88";
-                } else {
-                        mem_size = ALT_MEM_K;
-                        who = "BIOS-e801";
-                }
-
-                e820.nr_map = 0;
-                add_memory_region(0, LOWMEMSIZE(), E820_RAM);
-                add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
-        }
+        if (copy_e820_map(E820_MAP, E820_MAP_NR) < 0)
+                early_panic("Cannot find a valid memory map");
         printk(KERN_INFO "BIOS-provided physical RAM map:\n");
-        e820_print_map(who);
+        e820_print_map("BIOS-e820");
 }
 
-void __init parse_memopt(char *p, char **from) 
-{ 
-        end_user_pfn = memparse(p, from);
+static int __init parse_memopt(char *p)
+{
+        if (!p)
+                return -EINVAL;
+        end_user_pfn = memparse(p, &p);
         end_user_pfn >>= PAGE_SHIFT;    
+        return 0;
 } 
+early_param("mem", parse_memopt);
 
-void __init parse_memmapopt(char *p, char **from)
+static int userdef __initdata;
+
+static int __init parse_memmap_opt(char *p)
 {
+        char *oldp;
         unsigned long long start_at, mem_size;
 
-        mem_size = memparse(p, from);
-        p = *from;
+        if (!strcmp(p, "exactmap")) {
+#ifdef CONFIG_CRASH_DUMP
+                /* If we are doing a crash dump, we
+                 * still need to know the real mem
+                 * size before original memory map is
+                 * reset.
+                 */
+                saved_max_pfn = e820_end_of_ram();
+#endif
+                end_pfn_map = 0;
+                e820.nr_map = 0;
+                userdef = 1;
+                return 0;
+        }
+
+        oldp = p;
+        mem_size = memparse(p, &p);
+        if (p == oldp)
+                return -EINVAL;
         if (*p == '@') {
-                start_at = memparse(p+1, from);
+                start_at = memparse(p+1, &p);
                 add_memory_region(start_at, mem_size, E820_RAM);
         } else if (*p == '#') {
-                start_at = memparse(p+1, from);
+                start_at = memparse(p+1, &p);
                 add_memory_region(start_at, mem_size, E820_ACPI);
         } else if (*p == '$') {
-                start_at = memparse(p+1, from);
+                start_at = memparse(p+1, &p);
                 add_memory_region(start_at, mem_size, E820_RESERVED);
         } else {
                 end_user_pfn = (mem_size >> PAGE_SHIFT);
         }
-        p = *from;
+        return *p == '\0' ? 0 : -EINVAL;
+}
+early_param("memmap", parse_memmap_opt);
+
+void finish_e820_parsing(void)
+{
+        if (userdef) {
+                printk(KERN_INFO "user-defined physical RAM map:\n");
+                e820_print_map("user");
+        }
 }
 
 unsigned long pci_mem_start = 0xaeedbabe;