Intel IOMMU: Iommu Gfx workaround

[deliverable/linux.git] / arch / x86 / kernel / e820_64.c

diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
index 57616865d8a033595daff1a12be912151b17a6d7..1ca228b06a20340d743b8f1a01f3bcca5c6ae4a1 100644 (file)
--- a/arch/x86/kernel/e820_64.c
+++ b/arch/x86/kernel/e820_64.c
@@ -729,3 +729,22 @@ __init void e820_setup_gap(void)
        printk(KERN_INFO "Allocating PCI resources starting at %lx (gap: %lx:%lx)\n",
                pci_mem_start, gapstart, gapsize);
 }
+
+int __init arch_get_ram_range(int slot, u64 *addr, u64 *size)
+{
+       int i;
+
+       if (slot < 0 || slot >= e820.nr_map)
+               return -1;
+       for (i = slot; i < e820.nr_map; i++) {
+               if (e820.map[i].type != E820_RAM)
+                       continue;
+               break;
+       }
+       if (i == e820.nr_map || e820.map[i].addr > (max_pfn << PAGE_SHIFT))
+               return -1;
+       *addr = e820.map[i].addr;
+       *size = min_t(u64, e820.map[i].size + e820.map[i].addr,
+               max_pfn << PAGE_SHIFT) - *addr;
+       return i + 1;
+}