From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/sh/mm/uncached.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 arch/sh/mm/uncached.c (limited to 'arch/sh/mm/uncached.c') diff --git a/arch/sh/mm/uncached.c b/arch/sh/mm/uncached.c new file mode 100644 index 000000000..bd1585e8e --- /dev/null +++ b/arch/sh/mm/uncached.c @@ -0,0 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include + +/* + * This is the offset of the uncached section from its cached alias. + * + * Legacy platforms handle trivial transitions between cached and + * uncached segments by making use of the 1:1 mapping relationship in + * 512MB lowmem, others via a special uncached mapping. + * + * 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 = SZ_512M; +unsigned long uncached_size = SZ_512M; +unsigned long uncached_start, uncached_end; +EXPORT_SYMBOL(uncached_start); +EXPORT_SYMBOL(uncached_end); + +int virt_addr_uncached(unsigned long kaddr) +{ + return (kaddr >= uncached_start) && (kaddr < uncached_end); +} +EXPORT_SYMBOL(virt_addr_uncached); + +void __init uncached_init(void) +{ +#if defined(CONFIG_29BIT) || !defined(CONFIG_MMU) + uncached_start = P2SEG; +#else + uncached_start = memory_end; +#endif + uncached_end = uncached_start + uncached_size; +} + +void __init uncached_resize(unsigned long size) +{ + uncached_size = size; + uncached_end = uncached_start + uncached_size; +} -- cgit v1.2.3