diff options
| author | Ilya Yanok <yanok@emcraft.com> | 2008-12-11 02:55:41 +0100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-12-28 23:53:25 +0100 |
| commit | ca9153a3a2a7556d091dfe080e42b0e67881fff6 (patch) | |
| tree | 35b5ce24f190690cf7a726cbb97980da51704855 /arch/powerpc/include/asm/page_32.h | |
| parent | powerpc: Force memory size to be a multiple of PAGE_SIZE (diff) | |
| download | linux-ca9153a3a2a7556d091dfe080e42b0e67881fff6.tar.xz linux-ca9153a3a2a7556d091dfe080e42b0e67881fff6.zip | |
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 <yur@emcraft.com>
Signed-off-by: Vladimir Panfilov <pvr@emcraft.com>
Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/include/asm/page_32.h')
| -rw-r--r-- | arch/powerpc/include/asm/page_32.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/page_32.h b/arch/powerpc/include/asm/page_32.h index d77072a32cc6..1458d9500381 100644 --- a/arch/powerpc/include/asm/page_32.h +++ b/arch/powerpc/include/asm/page_32.h @@ -19,6 +19,8 @@ #define PTE_FLAGS_OFFSET 0 #endif +#define PTE_SHIFT (PAGE_SHIFT - PTE_T_LOG2) /* full page */ + #ifndef __ASSEMBLY__ /* * The basic type of a PTE - 64 bits for those CPUs with > 32 bit @@ -26,10 +28,8 @@ */ #ifdef CONFIG_PTE_64BIT typedef unsigned long long pte_basic_t; -#define PTE_SHIFT (PAGE_SHIFT - 3) /* 512 ptes per page */ #else typedef unsigned long pte_basic_t; -#define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */ #endif struct page; @@ -39,6 +39,9 @@ extern void copy_page(void *to, void *from); #include <asm-generic/page.h> +#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) +#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) + #endif /* __ASSEMBLY__ */ #endif /* _ASM_POWERPC_PAGE_32_H */ |