1 files changed, 62 insertions, 3 deletions

diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index bb8770a177b5..9b96e7dbaf67 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -26,6 +26,7 @@
 #include <linux/types.h>
 #include <linux/time.h>
 #include <linux/efi.h>
+#include <linux/kexec.h>
 
 #include <asm/io.h>
 #include <asm/kregs.h>
@@ -41,7 +42,7 @@ extern efi_status_t efi_call_phys (void *, ...);
 struct efi efi;
 EXPORT_SYMBOL(efi);
 static efi_runtime_services_t *runtime;
-static unsigned long mem_limit = ~0UL, max_addr = ~0UL;
+static unsigned long mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
 
 #define efi_call_virt(f, args...)       (*(f))(args)
 
@@ -421,6 +422,8 @@ efi_init (void)
                         mem_limit = memparse(cp + 4, &cp);
                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
+                } else if (memcmp(cp, "min_addr=", 9) == 0) {
+                        min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
                 } else {
                         while (*cp != ' ' && *cp)
                                 ++cp;
@@ -428,6 +431,8 @@ efi_init (void)
                                 ++cp;
                 }
         }
+        if (min_addr != 0UL)
+                printk(KERN_INFO "Ignoring memory below %luMB\n", min_addr >> 20);
         if (max_addr != ~0UL)
                 printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
 
@@ -894,7 +899,8 @@ find_memmap_space (void)
                 as = max(contig_low, md->phys_addr);
                 ae = min(contig_high, efi_md_end(md));
 
-                /* keep within max_addr= command line arg */
+                /* keep within max_addr= and min_addr= command line arg */
+                as = max(as, min_addr);
                 ae = min(ae, max_addr);
                 if (ae <= as)
                         continue;
@@ -1004,7 +1010,8 @@ efi_memmap_init(unsigned long *s, unsigned long *e)
                 } else
                         ae = efi_md_end(md);
 
-                /* keep within max_addr= command line arg */
+                /* keep within max_addr= and min_addr= command line arg */
+                as = max(as, min_addr);
                 ae = min(ae, max_addr);
                 if (ae <= as)
                         continue;
@@ -1116,6 +1123,58 @@ efi_initialize_iomem_resources(struct resource *code_resource,
                          */
                         insert_resource(res, code_resource);
                         insert_resource(res, data_resource);
+#ifdef CONFIG_KEXEC
+                        insert_resource(res, &efi_memmap_res);
+                        insert_resource(res, &boot_param_res);
+                        if (crashk_res.end > crashk_res.start)
+                                insert_resource(res, &crashk_res);
+#endif
                 }
         }
 }
+
+#ifdef CONFIG_KEXEC
+/* find a block of memory aligned to 64M exclude reserved regions
+   rsvd_regions are sorted
+ */
+unsigned long
+kdump_find_rsvd_region (unsigned long size,
+                struct rsvd_region *r, int n)
+{
+  int i;
+  u64 start, end;
+  u64 alignment = 1UL << _PAGE_SIZE_64M;
+  void *efi_map_start, *efi_map_end, *p;
+  efi_memory_desc_t *md;
+  u64 efi_desc_size;
+
+  efi_map_start = __va(ia64_boot_param->efi_memmap);
+  efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+  efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+  for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
+          md = p;
+          if (!efi_wb(md))
+                  continue;
+          start = ALIGN(md->phys_addr, alignment);
+          end = efi_md_end(md);
+          for (i = 0; i < n; i++) {
+                if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
+                        if (__pa(r[i].start) > start + size)
+                                return start;
+                        start = ALIGN(__pa(r[i].end), alignment);
+                        if (i < n-1 && __pa(r[i+1].start) < start + size)
+                                continue;
+                        else
+                                break;
+                }
+          }
+          if (end > start + size)
+                return start;
+  }
+
+  printk(KERN_WARNING "Cannot reserve 0x%lx byte of memory for crashdump\n",
+        size);
+  return ~0UL;
+}
+#endif