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powerpc/kconfig: make _etext and data areas alignment configurable on 8xx

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On 8xx, large pages (512kb or 8M) are used to map kernel linear
memory. Aligning to 8M reduces TLB misses as only 8M pages are used
in that case. We make 8M the default for data.

This patchs allows the user to do it via Kconfig.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2019-02-21 19:08:52 +00:00
committed by Michael Ellerman
parent d5f17ee964
commit 8f54a6f740
2 changed files with 17 additions and 5 deletions
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4
arch/powerpc/kernel/head_8xx.S
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@@ -416,7 +416,7 @@ InstructionTLBMiss:
#ifndef CONFIG_PIN_TLB_TEXT
ITLBMissLinear:
mtcr r11
#ifdef CONFIG_STRICT_KERNEL_RWX
#if defined(CONFIG_STRICT_KERNEL_RWX) && CONFIG_ETEXT_SHIFT < 23
patch_site 0f, patch__itlbmiss_linmem_top8
mfspr r10, SPRN_SRR0
@@ -537,7 +537,7 @@ DTLBMissIMMR:
DTLBMissLinear:
mtcr r11
rlwinm r10, r10, 20, 0x0f800000 /* 8xx supports max 256Mb RAM */
#ifdef CONFIG_STRICT_KERNEL_RWX
#if defined(CONFIG_STRICT_KERNEL_RWX) && CONFIG_DATA_SHIFT < 23
patch_site 0f, patch__dtlbmiss_romem_top8
0: subis r11, r10, (PAGE_OFFSET - 0x80000000)@ha