9b1568458a
The number of BIOSes that have an option to enable the IOMMU, or fix anything about its configuration, is vanishingly small. There's no good reason to punish quiet boot for this. Signed-off-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
#ifndef _ASM_X8664_GART_H
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#define _ASM_X8664_GART_H 1
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#include <asm/e820.h>
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extern void set_up_gart_resume(u32, u32);
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extern int fallback_aper_order;
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extern int fallback_aper_force;
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extern int fix_aperture;
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/* PTE bits. */
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#define GPTE_VALID 1
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#define GPTE_COHERENT 2
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/* Aperture control register bits. */
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#define GARTEN (1<<0)
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#define DISGARTCPU (1<<4)
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#define DISGARTIO (1<<5)
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/* GART cache control register bits. */
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#define INVGART (1<<0)
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#define GARTPTEERR (1<<1)
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/* K8 On-cpu GART registers */
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#define AMD64_GARTAPERTURECTL 0x90
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#define AMD64_GARTAPERTUREBASE 0x94
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#define AMD64_GARTTABLEBASE 0x98
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#define AMD64_GARTCACHECTL 0x9c
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#define AMD64_GARTEN (1<<0)
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static inline void enable_gart_translation(struct pci_dev *dev, u64 addr)
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{
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u32 tmp, ctl;
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/* address of the mappings table */
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addr >>= 12;
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tmp = (u32) addr<<4;
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tmp &= ~0xf;
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pci_write_config_dword(dev, AMD64_GARTTABLEBASE, tmp);
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/* Enable GART translation for this hammer. */
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pci_read_config_dword(dev, AMD64_GARTAPERTURECTL, &ctl);
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ctl |= GARTEN;
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ctl &= ~(DISGARTCPU | DISGARTIO);
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pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl);
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}
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static inline int aperture_valid(u64 aper_base, u32 aper_size, u32 min_size)
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{
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if (!aper_base)
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return 0;
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if (aper_base + aper_size > 0x100000000ULL) {
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printk(KERN_INFO "Aperture beyond 4GB. Ignoring.\n");
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return 0;
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}
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if (e820_any_mapped(aper_base, aper_base + aper_size, E820_RAM)) {
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printk(KERN_INFO "Aperture pointing to e820 RAM. Ignoring.\n");
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return 0;
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}
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if (aper_size < min_size) {
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printk(KERN_INFO "Aperture too small (%d MB) than (%d MB)\n",
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aper_size>>20, min_size>>20);
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return 0;
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}
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return 1;
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}
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#endif
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