LXR linux/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
   6extern void set_up_gart_resume(u32, u32);
   7
   8extern int fallback_aper_order;
   9extern int fallback_aper_force;
  10extern 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
  32extern int agp_amd64_init(void);
  33
  34static inline void enable_gart_translation(struct pci_dev *dev, u64 addr)
  35{
  36        u32 tmp, ctl;
  37
  38        /* address of the mappings table */
  39        addr >>= 12;
  40        tmp = (u32) addr<<4;
  41        tmp &= ~0xf;
  42        pci_write_config_dword(dev, AMD64_GARTTABLEBASE, tmp);
  43
  44        /* Enable GART translation for this hammer. */
  45        pci_read_config_dword(dev, AMD64_GARTAPERTURECTL, &ctl);
  46        ctl |= GARTEN;
  47        ctl &= ~(DISGARTCPU | DISGARTIO);
  48        pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl);
  49}
  50
  51static inline int aperture_valid(u64 aper_base, u32 aper_size, u32 min_size)
  52{
  53        if (!aper_base)
  54                return 0;
  55
  56        if (aper_base + aper_size > 0x100000000ULL) {
  57                printk(KERN_INFO "Aperture beyond 4GB. Ignoring.\n");
  58                return 0;
  59        }
  60        if (e820_any_mapped(aper_base, aper_base + aper_size, E820_RAM)) {
  61                printk(KERN_INFO "Aperture pointing to e820 RAM. Ignoring.\n");
  62                return 0;
  63        }
  64        if (aper_size < min_size) {
  65                printk(KERN_INFO "Aperture too small (%d MB) than (%d MB)\n",
  66                                 aper_size>>20, min_size>>20);
  67                return 0;
  68        }
  69
  70        return 1;
  71}
  72
  73#endif /* _ASM_X86_GART_H */
  74