参照元

説明

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

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