1 #ifndef _ASM_X86_GART_H
2 #define _ASM_X86_GART_H
6 extern void set_up_gart_resume(u32, u32);
8 extern int fallback_aper_order;
9 extern int fallback_aper_force;
10 extern int fix_aperture;
14 #define GPTE_COHERENT 2
16 /* Aperture control register bits. */
18 #define DISGARTCPU (1<<4)
19 #define DISGARTIO (1<<5)
20 #define DISTLBWALKPRB (1<<6)
22 /* GART cache control register bits. */
23 #define INVGART (1<<0)
24 #define GARTPTEERR (1<<1)
26 /* K8 On-cpu GART registers */
27 #define AMD64_GARTAPERTURECTL 0x90
28 #define AMD64_GARTAPERTUREBASE 0x94
29 #define AMD64_GARTTABLEBASE 0x98
30 #define AMD64_GARTCACHECTL 0x9c
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;
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);
43 #define gart_iommu_aperture 0
44 #define gart_iommu_aperture_allowed 0
45 #define gart_iommu_aperture_disabled 1
47 static inline void early_gart_iommu_check(void)
50 static inline void gart_parse_options(char *options)
53 static inline void gart_iommu_hole_init(void)
58 extern int agp_amd64_init(void);
60 static inline void gart_set_size_and_enable(struct pci_dev *dev, u32 order)
65 * Don't enable translation but enable GART IO and CPU accesses.
66 * Also, set DISTLBWALKPRB since GART tables memory is UC.
68 ctl = DISTLBWALKPRB | order << 1;
70 pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl);
73 static inline void enable_gart_translation(struct pci_dev *dev, u64 addr)
77 /* address of the mappings table */
81 pci_write_config_dword(dev, AMD64_GARTTABLEBASE, tmp);
83 /* Enable GART translation for this hammer. */
84 pci_read_config_dword(dev, AMD64_GARTAPERTURECTL, &ctl);
86 ctl &= ~(DISGARTCPU | DISGARTIO);
87 pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl);
90 static inline int aperture_valid(u64 aper_base, u32 aper_size, u32 min_size)
95 if (aper_base + aper_size > 0x100000000ULL) {
96 printk(KERN_INFO "Aperture beyond 4GB. Ignoring.\n");
99 if (e820_any_mapped(aper_base, aper_base + aper_size, E820_RAM)) {
100 printk(KERN_INFO "Aperture pointing to e820 RAM. Ignoring.\n");
103 if (aper_size < min_size) {
104 printk(KERN_INFO "Aperture too small (%d MB) than (%d MB)\n",
105 aper_size>>20, min_size>>20);
112 #endif /* _ASM_X86_GART_H */