参照元

説明

引数

返り値

参考

L_PTE_MT_ シリーズの実装。

arch/arm/include/asm/pgtable-2level.h:

#define L_PTE_MT_UNCACHED       (_AT(pteval_t, 0x00) << 2)      /* 0000 */
#define L_PTE_MT_BUFFERABLE     (_AT(pteval_t, 0x01) << 2)      /* 0001 */
#define L_PTE_MT_WRITETHROUGH   (_AT(pteval_t, 0x02) << 2)      /* 0010 */
#define L_PTE_MT_WRITEBACK      (_AT(pteval_t, 0x03) << 2)      /* 0011 */
#define L_PTE_MT_MINICACHE      (_AT(pteval_t, 0x06) << 2)      /* 0110 (sa1100, xscale) */
#define L_PTE_MT_WRITEALLOC     (_AT(pteval_t, 0x07) << 2)      /* 0111 */
#define L_PTE_MT_DEV_SHARED     (_AT(pteval_t, 0x04) << 2)      /* 0100 */
#define L_PTE_MT_DEV_NONSHARED  (_AT(pteval_t, 0x0c) << 2)      /* 1100 */
#define L_PTE_MT_DEV_WC         (_AT(pteval_t, 0x09) << 2)      /* 1001 */
#define L_PTE_MT_DEV_CACHED     (_AT(pteval_t, 0x0b) << 2)      /* 1011 */
#define L_PTE_MT_VECTORS        (_AT(pteval_t, 0x0f) << 2)      /* 1111 */
#define L_PTE_MT_MASK           (_AT(pteval_t, 0x0f) << 2)
arch/arm/include/asm/pgtable-3level.h:

#define L_PTE_MT_UNCACHED       (_AT(pteval_t, 0) << 2) /* strongly ordered */
#define L_PTE_MT_BUFFERABLE     (_AT(pteval_t, 1) << 2) /* normal non-cacheable */
#define L_PTE_MT_WRITETHROUGH   (_AT(pteval_t, 2) << 2) /* normal inner write-through */
#define L_PTE_MT_WRITEBACK      (_AT(pteval_t, 3) << 2) /* normal inner write-back */
#define L_PTE_MT_WRITEALLOC     (_AT(pteval_t, 7) << 2) /* normal inner write-alloc */
#define L_PTE_MT_DEV_SHARED     (_AT(pteval_t, 4) << 2) /* device */
#define L_PTE_MT_DEV_NONSHARED  (_AT(pteval_t, 4) << 2) /* device */
#define L_PTE_MT_DEV_WC         (_AT(pteval_t, 1) << 2) /* normal non-cacheable */
#define L_PTE_MT_DEV_CACHED     (_AT(pteval_t, 3) << 2) /* normal inner write-back */
#define L_PTE_MT_MASK           (_AT(pteval_t, 7) << 2)

実装

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

/*
 *      cpu_v7_set_pte_ext(ptep, pte)
 *
 *      Set a level 2 translation table entry.
 *
 *      - ptep  - pointer to level 2 translation table entry
 *                (hardware version is stored at +2048 bytes)
 *      - pte   - PTE value to store
 *      - ext   - value for extended PTE bits
 */
ENTRY(cpu_v7_set_pte_ext)
#ifdef CONFIG_MMU
        str     r1, [r0]                        @ linux version

        bic     r3, r1, #0x000003f0
        bic     r3, r3, #PTE_TYPE_MASK
        orr     r3, r3, r2
        orr     r3, r3, #PTE_EXT_AP0 | 2
        tst     r1, #1 << 4
        orrne   r3, r3, #PTE_EXT_TEX(1)
        eor     r1, r1, #L_PTE_DIRTY
        tst     r1, #L_PTE_RDONLY | L_PTE_DIRTY
        orrne   r3, r3, #PTE_EXT_APX

        tst     r1, #L_PTE_USER
        orrne   r3, r3, #PTE_EXT_AP1
        tst     r1, #L_PTE_XN
        orrne   r3, r3, #PTE_EXT_XN
        tst     r1, #L_PTE_YOUNG
        tstne   r1, #L_PTE_VALID
        eorne   r1, r1, #L_PTE_NONE
        tstne   r1, #L_PTE_NONE
        moveq   r3, #0
 ARM(   str     r3, [r0, #2048]! )
 THUMB( add     r0, r0, #2048 )
 THUMB( str     r3, [r0] )
        ALT_SMP(W(nop))
        ALT_UP (mcr     p15, 0, r0, c7, c10, 1)         @ flush_pte
#endif
        bx      lr
ENDPROC(cpu_v7_set_pte_ext)

CONFIG_ARM_LPAE 有効: arch/arm/mm/proc-v7-3level.S

/*
 * cpu_v7_set_pte_ext(ptep, pte)
 *
 * Set a level 2 translation table entry.
 * - ptep - pointer to level 3 translation table entry
 * - pte - PTE value to store (64-bit in r2 and r3)
 */
ENTRY(cpu_v7_set_pte_ext)
#ifdef CONFIG_MMU
        tst     rl, #L_PTE_VALID
        beq     1f
        tst     rh, #1 << (57 - 32)             @ L_PTE_NONE
        bicne   rl, #L_PTE_VALID
        bne     1f

        eor     ip, rh, #1 << (55 - 32) @ toggle L_PTE_DIRTY in temp reg to
                                        @ test for !L_PTE_DIRTY || L_PTE_RDONLY
        tst     ip, #1 << (55 - 32) | 1 << (58 - 32)
        orrne   rl, #PTE_AP2
        biceq   rl, #PTE_AP2

1:      strd    r2, r3, [r0]
        ALT_SMP(W(nop))
        ALT_UP (mcr     p15, 0, r0, c7, c10, 1)         @ flush_pte
#endif
        ret     lr
ENDPROC(cpu_v7_set_pte_ext)

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Last-modified: 2016-03-10 (木) 14:42:12