linux-4.4.1/PRRR の履歴ソース(No.2)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• 履歴 を表示
• linux-4.4.1/PRRR へ行く。
  • 1 (2016-02-29 (月) 18:41:30)
  • 2 (2016-02-29 (月) 18:48:02)

*参照元 [#z909d4f3]
#backlinks

*説明 [#r33c3c73]
-パス: 複数あり
--CONFIG_ARM_LPAE 無効: [[linux-4.4.1/arch/arm/mm/proc-v7-2level.S]]
--CONFIG_ARM_LPAE 有効: [[linux-4.4.1/arch/arm/mm/proc-v7-3level.S]]

-FIXME: これは何？
--Primary Region Remap Register (ARMv7, CP15, CRn=c10, opc1=0, CRm=c2, opc2=0)
--NMRR と一緒に使う
---[[linux-4.4.1/NMRR]]


**参考 [#od7481f1]


*実装 [#pc6e56a9]

**CONFIG_ARM_LPAE 無効: arch/arm/mm/proc-v7-2level.S [#pbd15500]
         /*
          * Memory region attributes with SCTLR.TRE=1
          *
          *   n = TEX[0],C,B
          *   TR = PRRR[2n+1:2n]         - memory type
          *   IR = NMRR[2n+1:2n]         - inner cacheable property
          *   OR = NMRR[2n+17:2n+16]     - outer cacheable property
          *
          *                      n       TR      IR      OR
          *   UNCACHED           000     00
          *   BUFFERABLE         001     10      00      00
          *   WRITETHROUGH       010     10      10      10
          *   WRITEBACK          011     10      11      11
          *   reserved           110
          *   WRITEALLOC         111     10      01      01
          *   DEV_SHARED         100     01
          *   DEV_NONSHARED      100     01
          *   DEV_WC             001     10
          *   DEV_CACHED         011     10
          *
          * Other attributes:
          *
          *   DS0 = PRRR[16] = 0         - device shareable property
          *   DS1 = PRRR[17] = 1         - device shareable property
          *   NS0 = PRRR[18] = 0         - normal shareable property
          *   NS1 = PRRR[19] = 1         - normal shareable property
          *   NOS = PRRR[24+n] = 1       - not outer shareable
          */
 ...
 .equ    PRRR,   0xff0a81a8


**CONFIG_ARM_LPAE 有効: arch/arm/mm/proc-v7-3level.S [#seb0a32e]
         /*
          * Memory region attributes for LPAE (defined in pgtable-3level.h):
          *
          *   n = AttrIndx[2:0]
          *
          *                      n       MAIR
          *   UNCACHED           000     00000000
          *   BUFFERABLE         001     01000100
          *   DEV_WC             001     01000100
          *   WRITETHROUGH       010     10101010
          *   WRITEBACK          011     11101110
          *   DEV_CACHED         011     11101110
          *   DEV_SHARED         100     00000100
          *   DEV_NONSHARED      100     00000100
          *   unused             101
          *   unused             110
          *   WRITEALLOC         111     11111111
          */
 ...
 .equ    PRRR,   0xeeaa4400                      @ MAIR0


*コメント [#iac5af0e]