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powerpc/8xx: Add support for TASK_SIZE greater than 0x80000000
By default, TASK_SIZE is set to 0x80000000 for PPC_8xx, which is most likely sufficient for most cases. However, kernel configuration allows to set TASK_SIZE to another value, so the 8xx shall handle it. This patch also takes into account the case of PAGE_OFFSET lower than 0x80000000, allthought most of the time it is equal to 0xC0000000 Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <scottwood@freescale.com>
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@ -48,6 +48,19 @@
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mtspr spr, reg
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#endif
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/* Macro to test if an address is a kernel address */
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#if CONFIG_TASK_SIZE <= 0x80000000 && CONFIG_PAGE_OFFSET >= 0x80000000
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#define IS_KERNEL(tmp, addr) \
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andis. tmp, addr, 0x8000 /* Address >= 0x80000000 */
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#define BRANCH_UNLESS_KERNEL(label) beq label
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#else
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#define IS_KERNEL(tmp, addr) \
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rlwinm tmp, addr, 16, 16, 31; \
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cmpli cr0, tmp, PAGE_OFFSET >> 16
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#define BRANCH_UNLESS_KERNEL(label) blt label
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#endif
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/*
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* Value for the bits that have fixed value in RPN entries.
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* Also used for tagging DAR for DTLBerror.
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@ -322,9 +335,9 @@ InstructionTLBMiss:
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mfspr r11, SPRN_SRR0 /* Get effective address of fault */
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INVALIDATE_ADJACENT_PAGES_CPU15(r10, r11)
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mfcr r10
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andis. r11, r11, 0x8000 /* Address >= 0x80000000 */
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IS_KERNEL(r11, r11)
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mfspr r11, SPRN_M_TW /* Get level 1 table */
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beq 3f
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BRANCH_UNLESS_KERNEL(3f)
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lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
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3:
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mtcr r10
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@ -379,9 +392,9 @@ DataStoreTLBMiss:
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* kernel page tables.
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*/
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mfspr r11, SPRN_MD_EPN
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andis. r11, r11, 0x8000
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IS_KERNEL(r11, r11)
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mfspr r11, SPRN_M_TW /* Get level 1 table */
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beq 3f
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BRANCH_UNLESS_KERNEL(3f)
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lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
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3:
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mtcr r10
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@ -513,9 +526,9 @@ FixupDAR:/* Entry point for dcbx workaround. */
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mtspr SPRN_SPRG_SCRATCH2, r10
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/* fetch instruction from memory. */
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mfspr r10, SPRN_SRR0
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andis. r11, r10, 0x8000 /* Address >= 0x80000000 */
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IS_KERNEL(r11, r10)
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mfspr r11, SPRN_M_TW /* Get level 1 table */
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beq 3f
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BRANCH_UNLESS_KERNEL(3f)
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lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
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/* Insert level 1 index */
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3: rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
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