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 7extern void set_up_gart_resume(u32, u32); 8 9extern int fallback_aper_order; 10extern int fallback_aper_force; 11extern 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 34extern int gart_iommu_aperture; 35extern int gart_iommu_aperture_allowed; 36extern int gart_iommu_aperture_disabled; 37 38extern void early_gart_iommu_check(void); 39extern int gart_iommu_init(void); 40extern void __init gart_parse_options(char *); 41extern int 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 48static inline void early_gart_iommu_check(void) 49{ 50} 51static inline void gart_parse_options(char *options) 52{ 53} 54static inline int gart_iommu_hole_init(void) 55{ 56 return -ENODEV; 57} 58#endif 59 60extern int agp_amd64_init(void); 61 62static inline void gart_set_size_and_enable(struct pci_dev *dev, u32 order) 63{ 64 u32 ctl; 65 66 /* 67 * Don't enable translation but enable GART IO and CPU accesses. 68 * Also, set DISTLBWALKPRB since GART tables memory is UC. 69 */ 70 ctl = order << 1; 71 72 pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl); 73} 74 75static inline void enable_gart_translation(struct pci_dev *dev, u64 addr) 76{ 77 u32 tmp, ctl; 78 79 /* address of the mappings table */ 80 addr >>= 12; 81 tmp = (u32) addr<<4; 82 tmp &= ~0xf; 83 pci_write_config_dword(dev, AMD64_GARTTABLEBASE, tmp); 84 85 /* Enable GART translation for this hammer. */ 86 pci_read_config_dword(dev, AMD64_GARTAPERTURECTL, &ctl); 87 ctl |= GARTEN | DISTLBWALKPRB; 88 ctl &= ~(DISGARTCPU | DISGARTIO); 89 pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl); 90} 91 92static inline int aperture_valid(u64 aper_base, u32 aper_size, u32 min_size) 93{ 94 if (!aper_base) 95 return 0; 96 97 if (aper_base + aper_size > 0x100000000ULL) { 98 printk(KERN_INFO "Aperture beyond 4GB. Ignoring.\n"); 99 return 0; 100 } 101 if (e820__mapped_any(aper_base, aper_base + aper_size, E820_TYPE_RAM)) { 102 printk(KERN_INFO "Aperture pointing to e820 RAM. Ignoring.\n"); 103 return 0; 104 } 105 if (aper_size < min_size) { 106 printk(KERN_INFO "Aperture too small (%d MB) than (%d MB)\n", 107 aper_size>>20, min_size>>20); 108 return 0; 109 } 110 111 return 1; 112} 113 114#endif /* _ASM_X86_GART_H */ 115