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对于MVA到PA转换过程,以及描述符所扮演的角色,请看下图:


来看代码:

unsigned long virtuladdr, physicaladdr;
unsigned To Senate Allow For Approve Id And Koaa Provide Immigrants Bill Offices com More long *mmu_tlb_base = (unsigned long *)0x30000000;//对应上图TTB
virtuladdr = 0xA0000000;//对应上图MVA
physicaladdr = 0x56000000;//对应上图PA
*(mmu_tlb_base + (virtuladdr >> 20)) = (physicaladdr & 0xFFF00000) | \
                                            MMU_SECDESC;
                                            //*(mmu_tlb_base + (virtuladdr >> 20)) = 
                                            //*(TTB[31-14]+MVA[31-20]+00) = *(描述符地址) 
To Senate Allow For Approve Id And Koaa Provide Immigrants Bill Offices com More //这里作用就是将描述符的值给定(bit[31-20]为PA的[31-20],bit[19-0]自己给定一些段描述符的操作),CPU系统自动根据此发生操作,获得实际PA地址。

我们根据上面可以得到:段描述符的地址=Translation base(高18位)-TTB bit[31-14]+Table index(低12位)-MVA bit[31-20]+00(低两位)不少人会以为*(mmu_tlb_base | virtuladdr>>18)才是正确的。

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解释:

首先mmu_tlb_base是一个unsigned long *型,而virtuladdr是unsigned long型,位或操作会出错!

查阅资料可知,一级页表的地址TTB必须16KB对齐,且位[14:0]必为0!

所以我们用+And - Me Fake My Get Is I So A Friend Says Imgur She This Make Can What Id|是一样的。而我们的mmu_tlb_base是unsigned long*型的,

在32位中,mmu_tlb_base + 1 = mmu_tlb_base + 1*sizeof(unsigned long*)=mmu_tlb_base + 4

To Senate Allow For Approve Id And Koaa Provide Immigrants Bill Offices com More 所以我们mmu_tlb_base + (virtuladdr >> 20) = mmu_tlb_base +( (virtuladdr >> 20))* 4 = mmu_tlb_base +( (virtuladdr >> 20))<<2 = mmu_tlb_base + (virtuladdr >>18

实验验证:

#include 

int main(To Senate Allow For Approve Id And Koaa Provide Immigrants Bill Offices com More To Senate Allow For Approve Id And Koaa Provide Immigrants Bill Offices com More int argc,char ** argv)
{
    unsigned long *a = (unsigned long *)0x30000000;
    unsigned long b = 0xA0000000;
    printf("a+(b>>20) = %#x.\n\n",a+(b>>20Dds Manual Drivers License Dds Drivers License));
    To Senate Allow For Approve Id And Koaa Provide Immigrants Bill Offices com More printf("a | ((b>>20)<<2) = %#x",0x30000000 | ((b>>20)<<2));
    return 0;
} 

结果:



A bill requiring the Department of Revenue to set up 10 more offices with the capability to issue identification documents, such as a drivers license, to people who are temporarily undocumented,...House and Senate approve bill to allow more offices to provide ID for immigrants | KOAA.com
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