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 */ 100