linux-4.4.1/PRRR の履歴(No.2)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース 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†

• linux-4.4.1/NMRR
• linux-4.4/ARMv7_MMU

説明†

• 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†

実装†

CONFIG_ARM_LPAE 無効: arch/arm/mm/proc-v7-2level.S†

        /*
         * 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†

        /*
         * 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†