diff options
| author | Stuart Menefy <stuart.menefy@st.com> | 2008-09-05 16:06:42 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2008-09-08 10:35:04 +0900 |
| commit | c6feb6142cb85228e73497a309f475a0d7279318 (patch) | |
| tree | c05344f677fabca1255d4e9e284e42a215f241d6 /arch | |
| parent | 3159e7d62ad13f71ef3fe029c145594d8caa580d (diff) | |
| download | linux-c6feb6142cb85228e73497a309f475a0d7279318.tar.bz2 | |
sh: early cached_to_uncached initialization.
statically initialise the cached_to_uncached offset, so that we can use
it immediatly.
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sh/include/asm/system_32.h | 3 | ||||
| -rw-r--r-- | arch/sh/mm/init.c | 27 |
2 files changed, 16 insertions, 14 deletions
diff --git a/arch/sh/include/asm/system_32.h b/arch/sh/include/asm/system_32.h index 16509ed2bb60..f7f105627fd9 100644 --- a/arch/sh/include/asm/system_32.h +++ b/arch/sh/include/asm/system_32.h @@ -58,7 +58,8 @@ do { \ last = __last; \ } while (0) -#define __uses_jump_to_uncached __attribute__ ((__section__ (".uncached.text"))) +#define __uses_jump_to_uncached \ + noinline __attribute__ ((__section__ (".uncached.text"))) /* * Jump to uncached area. diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c index d4681a55c852..f1a494283c4e 100644 --- a/arch/sh/mm/init.c +++ b/arch/sh/mm/init.c @@ -23,7 +23,19 @@ DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); pgd_t swapper_pg_dir[PTRS_PER_PGD]; -unsigned long cached_to_uncached = 0; + +#ifdef CONFIG_SUPERH32 +/* + * Handle trivial transitions between cached and uncached + * segments, making use of the 1:1 mapping relationship in + * 512MB lowmem. + * + * This is the offset of the uncached section from its cached alias. + * Default value only valid in 29 bit mode, in 32bit mode will be + * overridden in pmb_init. + */ +unsigned long cached_to_uncached = P2SEG - P1SEG; +#endif #ifdef CONFIG_MMU static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) @@ -58,9 +70,7 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) } set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); - - if (cached_to_uncached) - flush_tlb_one(get_asid(), addr); + flush_tlb_one(get_asid(), addr); } /* @@ -165,15 +175,6 @@ void __init paging_init(void) #ifdef CONFIG_SUPERH32 /* Set up the uncached fixmap */ set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start)); - -#ifdef CONFIG_29BIT - /* - * Handle trivial transitions between cached and uncached - * segments, making use of the 1:1 mapping relationship in - * 512MB lowmem. - */ - cached_to_uncached = P2SEG - P1SEG; -#endif #endif } |