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microblaze: Allow PAGE_SIZE configuration

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Allow developer to configure memory page size at compile time.
Larger pages can improve performance on some workloads.

Based on PowerPC code.

Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Steven J. Magnani
2010-05-13 10:48:27 -05:00
committed by Michal Simek
parent 0d9ec762af
commit ba9c4f88d7
6 changed files with 50 additions and 11 deletions
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12
arch/microblaze/include/asm/page.h
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@@ -23,8 +23,16 @@
#ifdef __KERNEL__
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT (12)
#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
#if defined(CONFIG_MICROBLAZE_32K_PAGES)
#define PAGE_SHIFT 15
#elif defined(CONFIG_MICROBLAZE_16K_PAGES)
#define PAGE_SHIFT 14
#elif defined(CONFIG_MICROBLAZE_8K_PAGES)
#define PAGE_SHIFT 13
#else
#define PAGE_SHIFT 12
#endif
#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))