4 files changed, 52 insertions, 13 deletions

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index ed46b7a6bc13..544dd12c70f4 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -359,6 +359,26 @@ static struct e820entry new_bios[E820_X_MAX] __initdata;
         return 0;
 }
 
+static int __init __copy_e820_map(struct e820entry *biosmap, int nr_map)
+{
+        while (nr_map) {
+                u64 start = biosmap->addr;
+                u64 size = biosmap->size;
+                u64 end = start + size;
+                u32 type = biosmap->type;
+
+                /* Overflow in 64 bits? Ignore the memory map. */
+                if (start > end)
+                        return -1;
+
+                e820_add_region(start, size, type);
+
+                biosmap++;
+                nr_map--;
+        }
+        return 0;
+}
+
 /*
  * Copy the BIOS e820 map into a safe place.
  *
@@ -374,19 +394,7 @@ int __init copy_e820_map(struct e820entry *biosmap, int nr_map)
         if (nr_map < 2)
                 return -1;
 
-        do {
-                u64 start = biosmap->addr;
-                u64 size = biosmap->size;
-                u64 end = start + size;
-                u32 type = biosmap->type;
-
-                /* Overflow in 64 bits? Ignore the memory map. */
-                if (start > end)
-                        return -1;
-
-                e820_add_region(start, size, type);
-        } while (biosmap++, --nr_map);
-        return 0;
+        return __copy_e820_map(biosmap, nr_map);
 }
 
 u64 __init e820_update_range(u64 start, u64 size, unsigned old_type,
@@ -496,6 +504,31 @@ __init void e820_setup_gap(void)
                pci_mem_start, gapstart, gapsize);
 }
 
+/**
+ * Because of the size limitation of struct boot_params, only first
+ * 128 E820 memory entries are passed to kernel via
+ * boot_params.e820_map, others are passed via SETUP_E820_EXT node of
+ * linked list of struct setup_data, which is parsed here.
+ */
+void __init parse_e820_ext(struct setup_data *sdata, unsigned long pa_data)
+{
+        u32 map_len;
+        int entries;
+        struct e820entry *extmap;
+
+        entries = sdata->len / sizeof(struct e820entry);
+        map_len = sdata->len + sizeof(struct setup_data);
+        if (map_len > PAGE_SIZE)
+                sdata = early_ioremap(pa_data, map_len);
+        extmap = (struct e820entry *)(sdata->data);
+        __copy_e820_map(extmap, entries);
+        sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+        if (map_len > PAGE_SIZE)
+                early_iounmap(sdata, map_len);
+        printk(KERN_INFO "extended physical RAM map:\n");
+        e820_print_map("extended");
+}
+
 #if defined(CONFIG_X86_64) || \
         (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
 /**
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 45a5e247d450..5b0de38cde48 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -150,6 +150,9 @@ void __init parse_setup_data(void)
         while (pa_data) {
                 data = early_ioremap(pa_data, PAGE_SIZE);
                 switch (data->type) {
+                case SETUP_E820_EXT:
+                        parse_e820_ext(data, pa_data);
+                        break;
                 default:
                         break;
                 }
diff --git a/include/asm-x86/bootparam.h b/include/asm-x86/bootparam.h
index 0a073904168b..876f21136660 100644
--- a/include/asm-x86/bootparam.h
+++ b/include/asm-x86/bootparam.h
@@ -11,6 +11,7 @@
 
 /* setup data types */
 #define SETUP_NONE                      0
+#define SETUP_E820_EXT                  1
 
 /* extensible setup data list node */
 struct setup_data {
diff --git a/include/asm-x86/e820.h b/include/asm-x86/e820.h
index 55d310596907..77fc24d89163 100644
--- a/include/asm-x86/e820.h
+++ b/include/asm-x86/e820.h
@@ -69,6 +69,8 @@ extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
                                unsigned new_type);
 extern void update_e820(void);
 extern void e820_setup_gap(void);
+struct setup_data;
+extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data);
 
 #if defined(CONFIG_X86_64) || \
         (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))