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authorPaul Mundt <lethal@linux-sh.org>2006-11-27 12:06:26 +0900
committerPaul Mundt <lethal@linux-sh.org>2006-12-06 10:45:39 +0900
commit510c72ad2dd4e05e6908755f51ac89482c6eb987 (patch)
treefa2e9e9a674e38dd523d937329627560f0bd6b64 /include/asm-sh
parent1dc41e58a553e612e3d0349bb60eef08f9462bde (diff)
downloadop-kernel-dev-510c72ad2dd4e05e6908755f51ac89482c6eb987.zip
op-kernel-dev-510c72ad2dd4e05e6908755f51ac89482c6eb987.tar.gz
sh: Fixup various PAGE_SIZE == 4096 assumptions.
There were a number of places that made evil PAGE_SIZE == 4k assumptions that ended up breaking when trying to play with 8k and 64k page sizes, this fixes those up. The most significant change is the way we load THREAD_SIZE, previously this was done via: mov #(THREAD_SIZE >> 8), reg shll8 reg to avoid a memory access and allow the immediate load. With a 64k PAGE_SIZE, we're out of range for the immediate load size without resorting to special instructions available in later ISAs (movi20s and so on). The "workaround" for this is to bump up the shift to 10 and insert a shll2, which gives a bit more flexibility while still being much cheaper than a memory access. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'include/asm-sh')
-rw-r--r--include/asm-sh/entry-macros.S3
-rw-r--r--include/asm-sh/pgtable.h6
-rw-r--r--include/asm-sh/thread_info.h8
3 files changed, 6 insertions, 11 deletions
diff --git a/include/asm-sh/entry-macros.S b/include/asm-sh/entry-macros.S
index 099fe81..500030e 100644
--- a/include/asm-sh/entry-macros.S
+++ b/include/asm-sh/entry-macros.S
@@ -23,8 +23,9 @@
#ifdef CONFIG_HAS_SR_RB
stc r7_bank, \ti
#else
- mov #((THREAD_SIZE - 1)>> 8) ^ 0xff, \tmp
+ mov #((THREAD_SIZE - 1) >> 10) ^ 0xff, \tmp
shll8 \tmp
+ shll2 \tmp
mov r15, \ti
and \tmp, \ti
#endif
diff --git a/include/asm-sh/pgtable.h b/include/asm-sh/pgtable.h
index fa62524..f87504a 100644
--- a/include/asm-sh/pgtable.h
+++ b/include/asm-sh/pgtable.h
@@ -47,8 +47,8 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
#define PGDIR_MASK (~(PGDIR_SIZE-1))
/* Entries per level */
-#define PTRS_PER_PTE (1 << PTE_BITS)
-#define PTRS_PER_PGD (1 << PGDIR_BITS)
+#define PTRS_PER_PTE (PAGE_SIZE / 4)
+#define PTRS_PER_PGD (PAGE_SIZE / 4)
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
@@ -57,7 +57,7 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
/*
* First 1MB map is used by fixed purpose.
- * Currently only 4-enty (16kB) is used (see arch/sh/mm/cache.c)
+ * Currently only 4-entry (16kB) is used (see arch/sh/mm/cache.c)
*/
#define VMALLOC_START (P3SEG+0x00100000)
#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
diff --git a/include/asm-sh/thread_info.h b/include/asm-sh/thread_info.h
index 3ebc3f9..0c01dc5 100644
--- a/include/asm-sh/thread_info.h
+++ b/include/asm-sh/thread_info.h
@@ -90,13 +90,7 @@ static inline struct thread_info *current_thread_info(void)
#endif
#define free_thread_info(ti) kfree(ti)
-#else /* !__ASSEMBLY__ */
-
-/* how to get the thread information struct from ASM */
-#define GET_THREAD_INFO(reg) \
- stc r7_bank, reg
-
-#endif
+#endif /* __ASSEMBLY__ */
/*
* thread information flags
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