[PATCH] kdump: x86_64: add memmmap command line option

[linux-2.6] / arch / x86_64 / kernel / setup.c

diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index 64c4534b930c74bc118cf1530a812401456f3d4e..ff9620b800c07d1ba203b118d4175b13878680ab 100644 (file)
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -275,6 +275,7 @@ static __init void parse_cmdline_early (char ** cmdline_p)
 {
        char c = ' ', *to = command_line, *from = COMMAND_LINE;
        int len = 0;
+       int userdef = 0;
 
        /* Save unparsed command line copy for /proc/cmdline */
        memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
@@ -357,6 +358,28 @@ static __init void parse_cmdline_early (char ** cmdline_p)
                if (!memcmp(from, "mem=", 4))
                        parse_memopt(from+4, &from); 
 
+               if (!memcmp(from, "memmap=", 7)) {
+                       /* exactmap option is for used defined memory */
+                       if (!memcmp(from+7, "exactmap", 8)) {
+#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
+                               from += 8+7;
+                               end_pfn_map = 0;
+                               e820.nr_map = 0;
+                               userdef = 1;
+                       }
+                       else {
+                               parse_memmapopt(from+7, &from);
+                               userdef = 1;
+                       }
+               }
+
 #ifdef CONFIG_NUMA
                if (!memcmp(from, "numa=", 5))
                        numa_setup(from+5); 
@@ -403,6 +426,10 @@ static __init void parse_cmdline_early (char ** cmdline_p)
                        break;
                *(to++) = c;
        }
+       if (userdef) {
+               printk(KERN_INFO "user-defined physical RAM map:\n");
+               e820_print_map("user");
+       }
        *to = '\0';
        *cmdline_p = command_line;
 }