From ca9153a3a2a7556d091dfe080e42b0e67881fff6 Mon Sep 17 00:00:00 2001 From: Ilya Yanok Date: Thu, 11 Dec 2008 04:55:41 +0300 Subject: powerpc/44x: Support 16K/64K base page sizes on 44x This adds support for 16k and 64k page sizes on PowerPC 44x processors. The PGDIR table is much smaller than a page when using 16k or 64k pages (512 and 32 bytes respectively) so we allocate the PGDIR with kzalloc() instead of __get_free_pages(). One PTE table covers rather a large memory area when using 16k or 64k pages (32MB or 512MB respectively), so we can easily put FIXMAP and PKMAP in the area covered by one PTE table. Signed-off-by: Yuri Tikhonov Signed-off-by: Vladimir Panfilov Signed-off-by: Ilya Yanok Acked-by: Josh Boyer Signed-off-by: Paul Mackerras --- arch/powerpc/include/asm/page.h | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) (limited to 'arch/powerpc/include/asm/page.h') diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index c0b8d4a29a91..197d569f5bd3 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -19,12 +19,15 @@ #include /* - * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software + * On regular PPC32 page size is 4K (but we support 4K/16K/64K pages + * on PPC44x). For PPC64 we support either 4K or 64K software * page size. When using 64K pages however, whether we are really supporting * 64K pages in HW or not is irrelevant to those definitions. */ -#ifdef CONFIG_PPC_64K_PAGES +#if defined(CONFIG_PPC_64K_PAGES) #define PAGE_SHIFT 16 +#elif defined(CONFIG_PPC_16K_PAGES) +#define PAGE_SHIFT 14 #else #define PAGE_SHIFT 12 #endif @@ -151,7 +154,7 @@ typedef struct { pte_basic_t pte; } pte_t; /* 64k pages additionally define a bigger "real PTE" type that gathers * the "second half" part of the PTE for pseudo 64k pages */ -#ifdef CONFIG_PPC_64K_PAGES +#if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64) typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; #else typedef struct { pte_t pte; } real_pte_t; @@ -191,10 +194,10 @@ typedef pte_basic_t pte_t; #define pte_val(x) (x) #define __pte(x) (x) -#ifdef CONFIG_PPC_64K_PAGES +#if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64) typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; #else -typedef unsigned long real_pte_t; +typedef pte_t real_pte_t; #endif -- cgit v1.2.2