1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_GART_H 3 #define _ASM_X86_GART_H 4 5 #include <asm/e820/api.h> 6 7 extern void set_up_gart_resume(u32, u32); 8 9 extern int fallback_aper_order; 10 extern int fallback_aper_force; 11 extern int fix_aperture; 12 13 /* PTE bits. */ 14 #define GPTE_VALID 1 15 #define GPTE_COHERENT 2 16 17 /* Aperture control register bits. */ 18 #define GARTEN (1<<0) 19 #define DISGARTCPU (1<<4) 20 #define DISGARTIO (1<<5) 21 #define DISTLBWALKPRB (1<<6) 22 23 /* GART cache control register bits. */ 24 #define INVGART (1<<0) 25 #define GARTPTEERR (1<<1) 26 27 /* K8 On-cpu GART registers */ 28 #define AMD64_GARTAPERTURECTL 0x90 29 #define AMD64_GARTAPERTUREBASE 0x94 30 #define AMD64_GARTTABLEBASE 0x98 31 #define AMD64_GARTCACHECTL 0x9c 32 33 #ifdef CONFIG_GART_IOMMU 34 extern int gart_iommu_aperture; 35 extern int gart_iommu_aperture_allowed; 36 extern int gart_iommu_aperture_disabled; 37 38 extern void early_gart_iommu_check(void); 39 extern int gart_iommu_init(void); 40 extern void __init gart_parse_options(char *); 41 void gart_iommu_hole_init(void); 42 43 #else 44 #define gart_iommu_aperture 0 45 #define gart_iommu_aperture_allowed 0 46 #define gart_iommu_aperture_disabled 1 47 48 static inline void early_gart_iommu_check(void) 49 { 50 } 51 static inline void gart_parse_options(char *options) 52 { 53 } 54 static inline void gart_iommu_hole_init(void) 55 { 56 } 57 #endif 58 59 extern int agp_amd64_init(void); 60 61 static inline void gart_set_size_and_enable(struct pci_dev *dev, u32 order) 62 { 63 u32 ctl; 64 65 /* 66 * Don't enable translation but enable GART IO and CPU accesses. 67 * Also, set DISTLBWALKPRB since GART tables memory is UC. 68 */ 69 ctl = order << 1; 70 71 pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl); 72 } 73 74 static inline void enable_gart_translation(struct pci_dev *dev, u64 addr) 75 { 76 u32 tmp, ctl; 77 78 /* address of the mappings table */ 79 addr >>= 12; 80 tmp = (u32) addr<<4; 81 tmp &= ~0xf; 82 pci_write_config_dword(dev, AMD64_GARTTABLEBASE, tmp); 83 84 /* Enable GART translation for this hammer. */ 85 pci_read_config_dword(dev, AMD64_GARTAPERTURECTL, &ctl); 86 ctl |= GARTEN | DISTLBWALKPRB; 87 ctl &= ~(DISGARTCPU | DISGARTIO); 88 pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl); 89 } 90 91 static inline int aperture_valid(u64 aper_base, u32 aper_size, u32 min_size) 92 { 93 if (!aper_base) 94 return 0; 95 96 if (aper_base + aper_size > 0x100000000ULL) { 97 printk(KERN_INFO "Aperture beyond 4GB. Ignoring.\n"); 98 return 0; 99 } 100 if (e820__mapped_any(aper_base, aper_base + aper_size, E820_TYPE_RAM)) { 101 printk(KERN_INFO "Aperture pointing to e820 RAM. Ignoring.\n"); 102 return 0; 103 } 104 if (aper_size < min_size) { 105 printk(KERN_INFO "Aperture too small (%d MB) than (%d MB)\n", 106 aper_size>>20, min_size>>20); 107 return 0; 108 } 109 110 return 1; 111 } 112 113 #endif /* _ASM_X86_GART_H */ 114