x86, aperture_64: use symbolic constants

[linux-2.6-omap-h63xx.git] / include / asm-x86 / gart.h

diff --git a/include/asm-x86/gart.h b/include/asm-x86/gart.h
index 6f22786d2f0c1620b9cbcbd4b22b9effc2db24e0..c818b96f936b5190d8d025054f918657e6a609ac 100644 (file)
--- a/include/asm-x86/gart.h
+++ b/include/asm-x86/gart.h
@@ -1,6 +1,8 @@
 #ifndef _ASM_X8664_IOMMU_H
 #define _ASM_X8664_IOMMU_H 1
 
+#include <asm/e820.h>
+
 extern void pci_iommu_shutdown(void);
 extern void no_iommu_init(void);
 extern int force_iommu, no_iommu;
@@ -69,4 +71,26 @@ static inline void enable_gart_translation(struct pci_dev *dev, u64 addr)
         pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl);
 }
 
+static inline int aperture_valid(u64 aper_base, u32 aper_size, u32 min_size)
+{
+       if (!aper_base)
+               return 0;
+
+       if (aper_base + aper_size > 0x100000000ULL) {
+               printk(KERN_ERR "Aperture beyond 4GB. Ignoring.\n");
+               return 0;
+       }
+       if (e820_any_mapped(aper_base, aper_base + aper_size, E820_RAM)) {
+               printk(KERN_ERR "Aperture pointing to e820 RAM. Ignoring.\n");
+               return 0;
+       }
+       if (aper_size < min_size) {
+               printk(KERN_ERR "Aperture too small (%d MB) than (%d MB)\n",
+                                aper_size>>20, min_size>>20);
+               return 0;
+       }
+
+       return 1;
+}
+
 #endif