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sh: Add support for 16kB PAGE_SIZE. 

16kB is a useful size on nommu, while 64kB still tends to be too big to
be useful. Newer MMUs are likely to support this as well, so plug it
in in anticipation of those, too.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
hifive-unleashed-5.1
Paul Mundt 2008-06-03 18:54:02 +09:00
parent 74fcc77982
commit 66dfe18114
4 changed files with 13 additions and 1 deletions
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6
arch/sh/mm/Kconfig
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@ -155,6 +155,12 @@ config PAGE_SIZE_8KB
help
This enables 8kB pages as supported by SH-X2 and later MMUs.
config PAGE_SIZE_16KB
bool "16kB"
depends on !MMU
help
This enables 16kB pages on MMU-less SH systems.
config PAGE_SIZE_64KB
bool "64kB"
depends on !MMU || CPU_SH4 || CPU_SH5

2
include/asm-sh/page.h
View File

@ -12,6 +12,8 @@
# define PAGE_SHIFT 12
#elif defined(CONFIG_PAGE_SIZE_8KB)
# define PAGE_SHIFT 13
#elif defined(CONFIG_PAGE_SIZE_16KB)
# define PAGE_SHIFT 14
#elif defined(CONFIG_PAGE_SIZE_64KB)
# define PAGE_SHIFT 16
#else

4
include/asm-sh/pgtable_32.h
View File

@ -102,7 +102,9 @@
#define _PAGE_FLAGS_HARDWARE_MASK (PHYS_ADDR_MASK & ~(_PAGE_CLEAR_FLAGS))
/* Hardware flags, page size encoding */
#if defined(CONFIG_X2TLB)
#if !defined(CONFIG_MMU)
# define _PAGE_FLAGS_HARD 0ULL
#elif defined(CONFIG_X2TLB)
# if defined(CONFIG_PAGE_SIZE_4KB)
# define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ0)
# elif defined(CONFIG_PAGE_SIZE_8KB)

2
include/asm-sh/thread_info.h
View File

@ -38,6 +38,8 @@ struct thread_info {
#define THREAD_SIZE_ORDER (1)
#elif defined(CONFIG_PAGE_SIZE_8KB)
#define THREAD_SIZE_ORDER (1)
#elif defined(CONFIG_PAGE_SIZE_16KB)
#define THREAD_SIZE_ORDER (0)
#elif defined(CONFIG_PAGE_SIZE_64KB)
#define THREAD_SIZE_ORDER (0)
#else