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 32#ifdef CONFIG_GART_IOMMU 33extern int gart_iommu_aperture; 34extern int gart_iommu_aperture_allowed; 35extern int gart_iommu_aperture_disabled; 36 37extern void early_gart_iommu_check(void); 38extern int gart_iommu_init(void); 39extern void __init gart_parse_options(char *); 40extern 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 47static inline void early_gart_iommu_check(void) 48{ 49} 50static inline void gart_parse_options(char *options) 51{ 52} 53static inline void gart_iommu_hole_init(void) 54{ 55} 56#endif 57 58extern int agp_amd64_init(void); 59 60static 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 77static 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