// SPDX-License-Identifier: GPL-2.0 #include <linux/init.h> #include <linux/module.h> #include <linux/sizes.h> #include <asm/page.h> #include <asm/addrspace.h> /* * 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; }