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powerpc/8xx: Implement 16k pages

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This patch activates the handling of 16k pages on the MPC8xx.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
LEROY Christophe 2014-09-19 10:36:09 +02:00 committed by Scott Wood
parent ac21951fa8
commit 959d6173b5
3 changed files with 7 additions and 1 deletions
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2
arch/powerpc/Kconfig
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@ -549,7 +549,7 @@ config PPC_4K_PAGES
bool "4k page size"
config PPC_16K_PAGES
bool "16k page size" if 44x
bool "16k page size" if 44x || PPC_8xx
config PPC_64K_PAGES
bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64

2
arch/powerpc/include/asm/mmu-8xx.h
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@ -56,6 +56,7 @@
* additional information from the MI_EPN, and MI_TWC registers.
*/
#define SPRN_MI_RPN 790
#define MI_SPS16K 0x00000008 /* Small page size (0 = 4k, 1 = 16k) */
/* Define an RPN value for mapping kernel memory to large virtual
* pages for boot initialization. This has real page number of 0,
@ -129,6 +130,7 @@
* additional information from the MD_EPN, and MD_TWC registers.
*/
#define SPRN_MD_RPN 798
#define MD_SPS16K 0x00000008 /* Small page size (0 = 4k, 1 = 16k) */
/* This is a temporary storage register that could be used to save
* a processor working register during a tablewalk.

4
arch/powerpc/kernel/head_8xx.S
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@ -45,7 +45,11 @@
* Value for the bits that have fixed value in RPN entries.
* Also used for tagging DAR for DTLBerror.
*/
#ifdef CONFIG_PPC_16K_PAGES
#define RPN_PATTERN (0x00f0 | MD_SPS16K)
#else
#define RPN_PATTERN 0x00f0
#endif
__HEAD
_ENTRY(_stext);