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powerpc/44x: Support 16K/64K base page sizes on 44x

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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>
This commit is contained in:
Ilya Yanok
2008-12-11 04:55:41 +03:00
committed by Paul Mackerras
parent 6ca4f7494b
commit ca9153a3a2
10 changed files with 130 additions and 48 deletions
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7
arch/powerpc/include/asm/page_32.h
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@@ -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 */