페이지 테이블 엔트리 속성

문영일 리눅스 커널

pt6

 

pt7

 

pt8

pt9

 

PRRR & NMRR

view source
01        /*
02         * Memory region attributes with SCTLR.TRE=1
03         *
04         *   n = TEX[0],C,B
05         *   TR = PRRR[2n+1:2n]         - memory type
06         *   IR = NMRR[2n+1:2n]         - inner cacheable property
07         *   OR = NMRR[2n+17:2n+16]     - outer cacheable property
08         *
09         *                      n       TR      IR      OR
10         *   UNCACHED           000     00
11         *   BUFFERABLE         001     10      00      00
12         *   WRITETHROUGH       010     10      10      10
13         *   WRITEBACK          011     10      11      11
14         *   reserved           110
15         *   WRITEALLOC         111     10      01      01
16         *   DEV_SHARED         100     01
17         *   DEV_NONSHARED      100     01
18         *   DEV_WC             001     10
19         *   DEV_CACHED         011     10
20         *
21         * Other attributes:
22         *
23         *   DS0 = PRRR[16] = 0         - device shareable property
24         *   DS1 = PRRR[17] = 1         - device shareable property
25         *   NS0 = PRRR[18] = 0         - normal shareable property
26         *   NS1 = PRRR[19] = 1         - normal shareable property
27         *   NOS = PRRR[24+n] = 1       - not outer shareable
28         */
29.equ    PRRR,   0xff0a81a8
30.equ    NMRR,   0x40e040e0
  • PRRR
    • <n>에서 n은 메모리 속성의 TEX[0], C, B에 해당한다.
    • NOS<n>: 0=Outer Shareable, 1=Inner Shareable
    • NS1: S=1 for Normal Memory. 0=not shareable, 1=shareable
    • NS0: S=0 for Normal Memory. 0=not shareable, 1=shareable
    • DS1: S=1 for Device Memory. 0=not shareable, 1=shareable
    • DS0: S=0 for Device Memory. 0=not shareable, 1=shareable
    • TR<n>: 메모리 속성을 위한 주 TEX 매핑
      • 00=strongly-ordered, 01=device, 10=normal memory, 11=reserved

prrr

view source
01TEX[0], C, B        Shareable           Memory Property
02================== =================== ====================
030     0     0       Outer Shareable     Strongly-ordered
040     0     1       Outer Shareable     Normal Memory
050     1     0       Outer Shareable     Normal Memory
060     1     1       Outer Shareable     Normal Memory
071     0     0       Outer Shareable     Device
081     0     1       Outer Shareable     Strongly-ordered
091     1     0       Outer Shareable     Strongly-ordered
101     1     1       Outer Shareable     Normal Memory

 

 

  • NMRR
    • <n>에서 n은 메모리 속성의 TEX[0], C, B에 해당한다.
    • OR<n>: Outer Cacheable 속성
      • 00=Non-cacheable, 01=WB, WA, 10=WT, no WA, 11=WB, no WA
    • IR<n>: Inner Cacheable 속성
      • 00=Non-cacheable, 01=WB, WA, 10=WT, no WA, 11=WB, no WA

nmrr

view source
01TEX[0], C, B        Outer Cache         Inner Cache
02================== =================== ====================
030     0     0       Non-Cacheable       Non-Cacheable  
040     0     1       Non-Cacheable       Non-Cacheable  
050     1     0       WT, no WA           WT, no WA
060     1     1       WB, no WA           WB, no WA
071     0     0       Non-Cacheable       Non-Cacheable  
081     0     1       Non-Cacheable       Non-Cacheable  
091     1     0       Non-Cacheable       Non-Cacheable  
101     1     1       WB, WA              WB, WA

 

참고

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