From b0f3ae03aca0f331b851ae94bc066124e7f104df Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Fri, 12 Feb 2010 15:40:00 +0900 Subject: sh: Isolate uncached mapping support. This splits out the uncached mapping support under its own config option, presently only used by 29-bit mode and 32-bit + PMB. This will make it possible to optionally add an uncached mapping on sh64 as well as booting without an uncached mapping for 32-bit. Signed-off-by: Paul Mundt --- arch/sh/mm/Kconfig | 5 +++++ arch/sh/mm/init.c | 11 ++++++++--- 2 files changed, 13 insertions(+), 3 deletions(-) (limited to 'arch/sh/mm') diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig index b89075256b7..65cb5b83e07 100644 --- a/arch/sh/mm/Kconfig +++ b/arch/sh/mm/Kconfig @@ -75,6 +75,7 @@ config MEMORY_SIZE config 29BIT def_bool !32BIT depends on SUPERH32 + select UNCACHED_MAPPING config 32BIT bool @@ -84,6 +85,7 @@ config PMB bool "Support 32-bit physical addressing through PMB" depends on MMU && EXPERIMENTAL && CPU_SH4A && !CPU_SH4AL_DSP select 32BIT + select UNCACHED_MAPPING help If you say Y here, physical addressing will be extended to 32-bits through the SH-4A PMB. If this is not set, legacy @@ -173,6 +175,9 @@ config IOREMAP_FIXED def_bool y depends on X2TLB || SUPERH64 +config UNCACHED_MAPPING + bool + choice prompt "Kernel page size" default PAGE_SIZE_4KB diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c index dffa6c74948..58012b6bbe7 100644 --- a/arch/sh/mm/init.c +++ b/arch/sh/mm/init.c @@ -21,11 +21,12 @@ #include #include #include +#include DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); pgd_t swapper_pg_dir[PTRS_PER_PGD]; -#ifdef CONFIG_SUPERH32 +#ifdef CONFIG_UNCACHED_MAPPING /* * This is the offset of the uncached section from its cached alias. * @@ -36,8 +37,8 @@ pgd_t swapper_pg_dir[PTRS_PER_PGD]; * Default value only valid in 29 bit mode, in 32bit mode this will be * updated by the early PMB initialization code. */ -unsigned long cached_to_uncached = P2SEG - P1SEG; -unsigned long uncached_size = 0x20000000; +unsigned long cached_to_uncached = 0x20000000; +unsigned long uncached_size = SZ_512M; #endif #ifdef CONFIG_MMU @@ -281,7 +282,9 @@ void __init mem_init(void) #endif " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" +#ifdef CONFIG_UNCACHED_MAPPING " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" +#endif " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", @@ -299,9 +302,11 @@ void __init mem_init(void) (unsigned long)memory_start, (unsigned long)high_memory, ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, +#ifdef CONFIG_UNCACHED_MAPPING (unsigned long)memory_start + cached_to_uncached, (unsigned long)memory_start + cached_to_uncached + uncached_size, uncached_size >> 20, +#endif (unsigned long)&__init_begin, (unsigned long)&__init_end, ((unsigned long)&__init_end - -- cgit v1.2.3-70-g09d2