x86: Don't use the EFI reboot method by default

[pandora-kernel.git] / arch / x86 / platform / efi / efi.c

diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 0d3a4fa..899e393 100644 (file)
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -310,14 +310,31 @@ void __init efi_reserve_boot_services(void)
 
        for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
                efi_memory_desc_t *md = p;
-               unsigned long long start = md->phys_addr;
-               unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
+               u64 start = md->phys_addr;
+               u64 size = md->num_pages << EFI_PAGE_SHIFT;
 
                if (md->type != EFI_BOOT_SERVICES_CODE &&
                    md->type != EFI_BOOT_SERVICES_DATA)
                        continue;
-
-               memblock_x86_reserve_range(start, start + size, "EFI Boot");
+               /* Only reserve where possible:
+                * - Not within any already allocated areas
+                * - Not over any memory area (really needed, if above?)
+                * - Not within any part of the kernel
+                * - Not the bios reserved area
+               */
+               if ((start+size >= virt_to_phys(_text)
+                               && start <= virt_to_phys(_end)) ||
+                       !e820_all_mapped(start, start+size, E820_RAM) ||
+                       memblock_x86_check_reserved_size(&start, &size,
+                                                       1<<EFI_PAGE_SHIFT)) {
+                       /* Could not reserve, skip it */
+                       md->num_pages = 0;
+                       memblock_dbg(PFX "Could not reserve boot range "
+                                       "[0x%010llx-0x%010llx]\n",
+                                               start, start+size-1);
+               } else
+                       memblock_x86_reserve_range(start, start+size,
+                                                       "EFI Boot");
        }
 }
 
@@ -334,6 +351,10 @@ static void __init efi_free_boot_services(void)
                    md->type != EFI_BOOT_SERVICES_DATA)
                        continue;
 
+               /* Could not reserve boot area */
+               if (!size)
+                       continue;
+
                free_bootmem_late(start, size);
        }
 }
@@ -483,9 +504,6 @@ void __init efi_init(void)
        x86_platform.set_wallclock = efi_set_rtc_mmss;
 #endif
 
-       /* Setup for EFI runtime service */
-       reboot_type = BOOT_EFI;
-
 #if EFI_DEBUG
        print_efi_memmap();
 #endif