Messages in this thread Patch in this message |  | | | Subject | [patch 4 of 4] i386 version of the changes | | From | Arjan van de Ven <> | | Date | Sat, 25 Mar 2006 17:25:45 +0100 |
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--- arch/i386/kernel/setup.c | 30 ++++++++++++++++++++++++++++++ arch/i386/pci/mmconfig.c | 12 ++++++++++++ include/asm-i386/e820.h | 3 +++ 3 files changed, 45 insertions(+) Index: linux-2.6.16-mmconfig/arch/i386/kernel/setup.c =================================================================== --- linux-2.6.16-mmconfig.orig/arch/i386/kernel/setup.c +++ linux-2.6.16-mmconfig/arch/i386/kernel/setup.c @@ -991,6 +991,36 @@ void __init find_max_pfn(void) } /* + * This function checks if the entire range <start,end> is mapped with type. + * + * Note: this function only works correct if the e820 table is sorted and + * not-overlapping, which is the case + */ +int __init e820_all_mapped(unsigned long start, unsigned long end, unsigned type) +{ + int i; + for (i = 0; i < e820.nr_map; i++) { + struct e820entry *ei = &e820.map[i]; + if (type && ei->type != type) + continue; + /* is the region (part) in overlap with the current region ?*/ + if (ei->addr >= end || ei->addr + ei->size <= start) + continue; + + /* if the region is at the beginning of <start,end> we move + * start to the end of the region since it's ok until there + */ + if (ei->addr <= start) + start = ei->addr + ei->size; + /* if start is now at or beyond end, we're done, full coverage */ + if (start >= end) + return 1; /* we're done */ + } + return 0; +} + + +/* * Determine low and high memory ranges: */ unsigned long __init find_max_low_pfn(void) Index: linux-2.6.16-mmconfig/arch/i386/pci/mmconfig.c =================================================================== --- linux-2.6.16-mmconfig.orig/arch/i386/pci/mmconfig.c +++ linux-2.6.16-mmconfig/arch/i386/pci/mmconfig.c @@ -12,6 +12,7 @@ #include <linux/pci.h> #include <linux/init.h> #include <linux/acpi.h> +#include <asm/e820.h> #include "pci.h" #define mmcfg_virt_addr ((void __iomem *) fix_to_virt(FIX_PCIE_MCFG)) @@ -19,6 +20,9 @@ /* The base address of the last MMCONFIG device accessed */ static u32 mmcfg_last_accessed_device; +#define MMCONFIG_APER_SIZE (256*1024*1024) + + static DECLARE_BITMAP(fallback_slots, 32); /* @@ -183,6 +187,14 @@ void __init pci_mmcfg_init(void) (pci_mmcfg_config[0].base_address == 0)) return; + if (!e820_all_mapped(pci_mmcfg_config[0].base_address, + pci_mmcfg_config[0].base_address + MMCONFIG_APER_SIZE, + E820_RESERVED)) { + printk(KERN_INFO "PCI: BIOS Bug: MCFG area is not E820-reserved\n"); + printk(KERN_INFO "PCI: Not using MMCONFIG.\n"); + return; + } + printk(KERN_INFO "PCI: Using MMCONFIG\n"); raw_pci_ops = &pci_mmcfg; pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF; Index: linux-2.6.16-mmconfig/include/asm-i386/e820.h =================================================================== --- linux-2.6.16-mmconfig.orig/include/asm-i386/e820.h +++ linux-2.6.16-mmconfig/include/asm-i386/e820.h @@ -35,6 +35,9 @@ struct e820map { }; extern struct e820map e820; + +extern int e820_all_mapped(unsigned long start, unsigned long end, unsigned type); + #endif/*!__ASSEMBLY__*/ #endif/*__E820_HEADER*/
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