x86_64: prepare shared kernel/aperture.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 298 deletions

diff --git a/arch/x86_64/kernel/aperture.c b/arch/x86_64/kernel/aperture.c
deleted file mode 100644
index 8f681cae7bf7..000000000000
--- a/arch/x86_64/kernel/aperture.c
+++ /dev/null
@@ -1,298 +0,0 @@
-/* 
- * Firmware replacement code.
- * 
- * Work around broken BIOSes that don't set an aperture or only set the
- * aperture in the AGP bridge. 
- * If all fails map the aperture over some low memory.  This is cheaper than 
- * doing bounce buffering. The memory is lost. This is done at early boot 
- * because only the bootmem allocator can allocate 32+MB. 
- * 
- * Copyright 2002 Andi Kleen, SuSE Labs.
- */
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/init.h>
-#include <linux/bootmem.h>
-#include <linux/mmzone.h>
-#include <linux/pci_ids.h>
-#include <linux/pci.h>
-#include <linux/bitops.h>
-#include <linux/ioport.h>
-#include <asm/e820.h>
-#include <asm/io.h>
-#include <asm/iommu.h>
-#include <asm/pci-direct.h>
-#include <asm/dma.h>
-#include <asm/k8.h>
-
-int iommu_aperture;
-int iommu_aperture_disabled __initdata = 0;
-int iommu_aperture_allowed __initdata = 0;
-
-int fallback_aper_order __initdata = 1; /* 64MB */
-int fallback_aper_force __initdata = 0; 
-
-int fix_aperture __initdata = 1;
-
-static struct resource gart_resource = {
-	.name	= "GART",
-	.flags	= IORESOURCE_MEM,
-};
-
-static void __init insert_aperture_resource(u32 aper_base, u32 aper_size)
-{
-	gart_resource.start = aper_base;
-	gart_resource.end = aper_base + aper_size - 1;
-	insert_resource(&iomem_resource, &gart_resource);
-}
-
-/* This code runs before the PCI subsystem is initialized, so just
-   access the northbridge directly. */
-
-static u32 __init allocate_aperture(void) 
-{
-	u32 aper_size;
-	void *p; 
-
-	if (fallback_aper_order > 7) 
-		fallback_aper_order = 7; 
-	aper_size = (32 * 1024 * 1024) << fallback_aper_order; 
-
-	/* 
-	 * Aperture has to be naturally aligned. This means an 2GB aperture won't
-	 * have much chance of finding a place in the lower 4GB of memory.
-	 * Unfortunately we cannot move it up because that would make the
-	 * IOMMU useless.
-	 */
-	p = __alloc_bootmem_nopanic(aper_size, aper_size, 0);
-	if (!p || __pa(p)+aper_size > 0xffffffff) {
-		printk("Cannot allocate aperture memory hole (%p,%uK)\n",
-		       p, aper_size>>10);
-		if (p)
-			free_bootmem(__pa(p), aper_size);
-		return 0;
-	}
-	printk("Mapping aperture over %d KB of RAM @ %lx\n",
-	       aper_size >> 10, __pa(p)); 
-	insert_aperture_resource((u32)__pa(p), aper_size);
-	return (u32)__pa(p); 
-}
-
-static int __init aperture_valid(u64 aper_base, u32 aper_size)
-{ 
-	if (!aper_base) 
-		return 0;
-	if (aper_size < 64*1024*1024) { 
-		printk("Aperture too small (%d MB)\n", aper_size>>20);
-		return 0;
-	}
-	if (aper_base + aper_size > 0x100000000UL) {
-		printk("Aperture beyond 4GB. Ignoring.\n");
-		return 0; 
-	}
-	if (e820_any_mapped(aper_base, aper_base + aper_size, E820_RAM)) {
-		printk("Aperture pointing to e820 RAM. Ignoring.\n");
-		return 0; 
-	} 
-	return 1;
-} 
-
-/* Find a PCI capability */
-static __u32 __init find_cap(int num, int slot, int func, int cap) 
-{ 
-	u8 pos;
-	int bytes;
-	if (!(read_pci_config_16(num,slot,func,PCI_STATUS) & PCI_STATUS_CAP_LIST))
-		return 0;
-	pos = read_pci_config_byte(num,slot,func,PCI_CAPABILITY_LIST);
-	for (bytes = 0; bytes < 48 && pos >= 0x40; bytes++) { 
-		u8 id;
-		pos &= ~3; 
-		id = read_pci_config_byte(num,slot,func,pos+PCI_CAP_LIST_ID);
-		if (id == 0xff)
-			break;
-		if (id == cap) 
-			return pos; 
-		pos = read_pci_config_byte(num,slot,func,pos+PCI_CAP_LIST_NEXT); 
-	} 
-	return 0;
-} 
-
-/* Read a standard AGPv3 bridge header */
-static __u32 __init read_agp(int num, int slot, int func, int cap, u32 *order)
-{ 
-	u32 apsize;
-	u32 apsizereg;
-	int nbits;
-	u32 aper_low, aper_hi;
-	u64 aper;
-
-	printk("AGP bridge at %02x:%02x:%02x\n", num, slot, func);
-	apsizereg = read_pci_config_16(num,slot,func, cap + 0x14);
-	if (apsizereg == 0xffffffff) {
-		printk("APSIZE in AGP bridge unreadable\n");
-		return 0;
-	}
-
-	apsize = apsizereg & 0xfff;
-	/* Some BIOS use weird encodings not in the AGPv3 table. */
-	if (apsize & 0xff) 
-		apsize |= 0xf00; 
-	nbits = hweight16(apsize);
-	*order = 7 - nbits;
-	if ((int)*order < 0) /* < 32MB */
-		*order = 0;
-	
-	aper_low = read_pci_config(num,slot,func, 0x10);
-	aper_hi = read_pci_config(num,slot,func,0x14);
-	aper = (aper_low & ~((1<<22)-1)) | ((u64)aper_hi << 32);
-
-	printk("Aperture from AGP @ %Lx size %u MB (APSIZE %x)\n", 
-	       aper, 32 << *order, apsizereg);
-
-	if (!aperture_valid(aper, (32*1024*1024) << *order))
-	    return 0;
-	return (u32)aper; 
-} 
-
-/* Look for an AGP bridge. Windows only expects the aperture in the
-   AGP bridge and some BIOS forget to initialize the Northbridge too.
-   Work around this here. 
-
-   Do an PCI bus scan by hand because we're running before the PCI
-   subsystem. 
-
-   All K8 AGP bridges are AGPv3 compliant, so we can do this scan
-   generically. It's probably overkill to always scan all slots because
-   the AGP bridges should be always an own bus on the HT hierarchy, 
-   but do it here for future safety. */
-static __u32 __init search_agp_bridge(u32 *order, int *valid_agp)
-{
-	int num, slot, func;
-
-	/* Poor man's PCI discovery */
-	for (num = 0; num < 256; num++) { 
-		for (slot = 0; slot < 32; slot++) { 
-			for (func = 0; func < 8; func++) { 
-				u32 class, cap;
-				u8 type;
-				class = read_pci_config(num,slot,func,
-							PCI_CLASS_REVISION);
-				if (class == 0xffffffff)
-					break; 
-				
-				switch (class >> 16) { 
-				case PCI_CLASS_BRIDGE_HOST:
-				case PCI_CLASS_BRIDGE_OTHER: /* needed? */
-					/* AGP bridge? */
-					cap = find_cap(num,slot,func,PCI_CAP_ID_AGP);
-					if (!cap)
-						break;
-					*valid_agp = 1; 
-					return read_agp(num,slot,func,cap,order);
-				} 
-				
-				/* No multi-function device? */
-				type = read_pci_config_byte(num,slot,func,
-							       PCI_HEADER_TYPE);
-				if (!(type & 0x80))
-					break;
-			} 
-		} 
-	}
-	printk("No AGP bridge found\n"); 
-	return 0;
-}
-
-void __init iommu_hole_init(void) 
-{ 
-	int fix, num; 
-	u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0;
-	u64 aper_base, last_aper_base = 0;
-	int valid_agp = 0;
-
-	if (iommu_aperture_disabled || !fix_aperture || !early_pci_allowed())
-		return;
-
-	printk(KERN_INFO  "Checking aperture...\n");
-
-	fix = 0;
-	for (num = 24; num < 32; num++) {		
-		if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
-			continue;
-
-		iommu_detected = 1;
-		iommu_aperture = 1; 
-
-		aper_order = (read_pci_config(0, num, 3, 0x90) >> 1) & 7; 
-		aper_size = (32 * 1024 * 1024) << aper_order; 
-		aper_base = read_pci_config(0, num, 3, 0x94) & 0x7fff;
-		aper_base <<= 25; 
-
-		printk("CPU %d: aperture @ %Lx size %u MB\n", num-24, 
-		       aper_base, aper_size>>20);
-		
-		if (!aperture_valid(aper_base, aper_size)) {
-			fix = 1; 
-			break; 
-		}
-
-		if ((last_aper_order && aper_order != last_aper_order) ||
-		    (last_aper_base && aper_base != last_aper_base)) {
-			fix = 1;
-			break;
-		}
-		last_aper_order = aper_order;
-		last_aper_base = aper_base;
-	} 
-
-	if (!fix && !fallback_aper_force) {
-		if (last_aper_base) {
-			unsigned long n = (32 * 1024 * 1024) << last_aper_order;
-			insert_aperture_resource((u32)last_aper_base, n);
-		}
-		return; 
-	}
-
-	if (!fallback_aper_force)
-		aper_alloc = search_agp_bridge(&aper_order, &valid_agp); 
-		
-	if (aper_alloc) { 
-		/* Got the aperture from the AGP bridge */
-	} else if (swiotlb && !valid_agp) {
-		/* Do nothing */
-	} else if ((!no_iommu && end_pfn > MAX_DMA32_PFN) ||
-		   force_iommu ||
-		   valid_agp ||
-		   fallback_aper_force) { 
-		printk("Your BIOS doesn't leave a aperture memory hole\n");
-		printk("Please enable the IOMMU option in the BIOS setup\n");
-		printk("This costs you %d MB of RAM\n",
-		       32 << fallback_aper_order);
-
-		aper_order = fallback_aper_order;
-		aper_alloc = allocate_aperture();
-		if (!aper_alloc) { 
-			/* Could disable AGP and IOMMU here, but it's probably
-			   not worth it. But the later users cannot deal with
-			   bad apertures and turning on the aperture over memory
-			   causes very strange problems, so it's better to 
-			   panic early. */
-			panic("Not enough memory for aperture");
-		}
-	} else { 
-		return; 
-	} 
-
-	/* Fix up the north bridges */
-	for (num = 24; num < 32; num++) { 		
-		if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
-			continue;	
-
-		/* Don't enable translation yet. That is done later. 
-		   Assume this BIOS didn't initialise the GART so 
-		   just overwrite all previous bits */ 
-		write_pci_config(0, num, 3, 0x90, aper_order<<1); 
-		write_pci_config(0, num, 3, 0x94, aper_alloc>>25); 
-	} 
-}