arch/x86/include/asm/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 #ifdef CONFIG_GART_IOMMU
  33 extern int gart_iommu_aperture;
  34 extern int gart_iommu_aperture_allowed;
  35 extern int gart_iommu_aperture_disabled;
  36
  37 extern void early_gart_iommu_check(void);
  38 extern int gart_iommu_init(void);
  39 extern void __init gart_parse_options(char *);
  40 extern void gart_iommu_hole_init(void);
  41
  42 #else
  43 #define gart_iommu_aperture            0
  44 #define gart_iommu_aperture_allowed    0
  45 #define gart_iommu_aperture_disabled   1
  46
  47 static inline void early_gart_iommu_check(void)
  48 {
  49 }
  50 static inline void gart_parse_options(char *options)
  51 {
  52 }
  53 static inline void gart_iommu_hole_init(void)
  54 {
  55 }
  56 #endif
  57
  58 extern int agp_amd64_init(void);
  59
  60 static inline void enable_gart_translation(struct pci_dev *dev, u64 addr)
  61 {
  62         u32 tmp, ctl;
  63
  64         /* address of the mappings table */
  65         addr >>= 12;
  66         tmp = (u32) addr<<4;
  67         tmp &= ~0xf;
  68         pci_write_config_dword(dev, AMD64_GARTTABLEBASE, tmp);
  69
  70         /* Enable GART translation for this hammer. */
  71         pci_read_config_dword(dev, AMD64_GARTAPERTURECTL, &ctl);
  72         ctl |= GARTEN;
  73         ctl &= ~(DISGARTCPU | DISGARTIO);
  74         pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl);
  75 }
  76
  77 static inline int aperture_valid(u64 aper_base, u32 aper_size, u32 min_size)
  78 {
  79         if (!aper_base)
  80                 return 0;
  81
  82         if (aper_base + aper_size > 0x100000000ULL) {
  83                 printk(KERN_INFO "Aperture beyond 4GB. Ignoring.\n");
  84                 return 0;
  85         }
  86         if (e820_any_mapped(aper_base, aper_base + aper_size, E820_RAM)) {
  87                 printk(KERN_INFO "Aperture pointing to e820 RAM. Ignoring.\n");
  88                 return 0;
  89         }
  90         if (aper_size < min_size) {
  91                 printk(KERN_INFO "Aperture too small (%d MB) than (%d MB)\n",
  92                                  aper_size>>20, min_size>>20);
  93                 return 0;
  94         }
  95
  96         return 1;
  97 }
  98
  99 #endif /* _ASM_X86_GART_H */