include/asm-x86/gart.h

   1 #ifndef ASM_X86__GART_H
   2 #define ASM_X86__GART_H
   3
   4 #include <asm/e820.h>
   5
   6 extern void set_up_gart_resume(u32, u32);
   7
   8 extern int fallback_aper_order;
   9 extern int fallback_aper_force;
  10 extern int fix_aperture;
  11
  12 /* PTE bits. */
  13 #define GPTE_VALID      1
  14 #define GPTE_COHERENT   2
  15
  16 /* Aperture control register bits. */
  17 #define GARTEN          (1<<0)
  18 #define DISGARTCPU      (1<<4)
  19 #define DISGARTIO       (1<<5)
  20
  21 /* GART cache control register bits. */
  22 #define INVGART         (1<<0)
  23 #define GARTPTEERR      (1<<1)
  24
  25 /* K8 On-cpu GART registers */
  26 #define AMD64_GARTAPERTURECTL   0x90
  27 #define AMD64_GARTAPERTUREBASE  0x94
  28 #define AMD64_GARTTABLEBASE     0x98
  29 #define AMD64_GARTCACHECTL      0x9c
  30 #define AMD64_GARTEN            (1<<0)
  31
  32 static inline void enable_gart_translation(struct pci_dev *dev, u64 addr)
  33 {
  34         u32 tmp, ctl;
  35
  36         /* address of the mappings table */
  37         addr >>= 12;
  38         tmp = (u32) addr<<4;
  39         tmp &= ~0xf;
  40         pci_write_config_dword(dev, AMD64_GARTTABLEBASE, tmp);
  41
  42         /* Enable GART translation for this hammer. */
  43         pci_read_config_dword(dev, AMD64_GARTAPERTURECTL, &ctl);
  44         ctl |= GARTEN;
  45         ctl &= ~(DISGARTCPU | DISGARTIO);
  46         pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl);
  47 }
  48
  49 static inline int aperture_valid(u64 aper_base, u32 aper_size, u32 min_size)
  50 {
  51         if (!aper_base)
  52                 return 0;
  53
  54         if (aper_base + aper_size > 0x100000000ULL) {
  55                 printk(KERN_ERR "Aperture beyond 4GB. Ignoring.\n");
  56                 return 0;
  57         }
  58         if (e820_any_mapped(aper_base, aper_base + aper_size, E820_RAM)) {
  59                 printk(KERN_ERR "Aperture pointing to e820 RAM. Ignoring.\n");
  60                 return 0;
  61         }
  62         if (aper_size < min_size) {
  63                 printk(KERN_ERR "Aperture too small (%d MB) than (%d MB)\n",
  64                                  aper_size>>20, min_size>>20);
  65                 return 0;
  66         }
  67
  68         return 1;
  69 }
  70
  71 #endif /* ASM_X86__GART_H */