x86: add LongModeAddressSize function to cpuid
LongModeAddressSize was used by kernel 2.6.28.4 for physical address validation, if not properly implemented, PCI resource allocation may failed because of ioremap failed: - linux-2.6.28.4/arch/x86/mm/ioremap.c:27-30 27 static inline int phys_addr_valid(unsigned long addr) 28 { 29 return addr < (1UL << boot_cpu_data.x86_phys_bits); 30 } - linux-2.6.28.4/arch/x86/kernel/cpu/common.c:475-482 475 #ifdef CONFIG_X86_64 476 if (c->extended_cpuid_level >= 0x80000008) { 477 u32 eax = cpuid_eax(0x80000008); 478 479 c->x86_virt_bits = (eax >> 8) & 0xff; 480 c->x86_phys_bits = eax & 0xff; 481 } 482 #endif - linux-2.6.28.4/arch/x86/mm/ioremap.c:209-214 209 if (!phys_addr_valid(phys_addr)) { 210 printk(KERN_WARNING "ioremap: invalid physical address %llx\n", 211 (unsigned long long)phys_addr); 212 WARN_ON_ONCE(1); 213 return NULL; 214 } This patch return 0x0000ffff for LongModeAddressSize, which guarantee phys_addr_valid never failed. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
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1 changed files with 7 additions and 4 deletions
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@ -48,12 +48,12 @@ namespace X86ISA {
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L1CacheAndTLB,
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L1CacheAndTLB,
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L2L3CacheAndL2TLB,
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L2L3CacheAndL2TLB,
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APMInfo,
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APMInfo,
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LongModeAddressSize,
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/*
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/*
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* The following are defined by the spec but not yet implemented
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* The following are defined by the spec but not yet implemented
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*/
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*/
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/* LongModeAddressSize,
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/* // Function 9 is reserved
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// Function 9 is reserved
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SVMInfo = 10,
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SVMInfo = 10,
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// Functions 11-24 are reserved
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// Functions 11-24 are reserved
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TLB1GBPageInfo = 25,
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TLB1GBPageInfo = 25,
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@ -130,8 +130,11 @@ namespace X86ISA {
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result = CpuidResult(0x80000018, 0x68747541,
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result = CpuidResult(0x80000018, 0x68747541,
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0x69746e65, 0x444d4163);
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0x69746e65, 0x444d4163);
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break;
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break;
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/* case LongModeAddressSize:
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case LongModeAddressSize:
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case SVMInfo:
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result = CpuidResult(0x0000ffff, 0x00000000,
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0x00000000, 0x00000000);
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break;
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/* case SVMInfo:
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case TLB1GBPageInfo:
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case TLB1GBPageInfo:
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case PerformanceInfo:*/
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case PerformanceInfo:*/
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default:
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default:
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