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authorGuo Ren <ren_guo@c-sky.com>2018-09-05 14:25:12 +0800
committerGuo Ren <ren_guo@c-sky.com>2018-10-25 23:36:19 +0800
commit013de2d6671d89de3397904749c86a69ac0686f7 (patch)
treea957e4719ccb7f7383bfa17f8937d61409ee9119 /arch/csky/abiv1/inc/abi/page.h
parent00a9730e1007c6cc87a7c78af2f24a4105d616ee (diff)
downloadlinux-sh-013de2d6671d89de3397904749c86a69ac0686f7.tar.gz
csky: MMU and page table management
This patch adds files related to memory management and here is our memory-layout: Fixmap : 0xffc02000 – 0xfffff000 (4 MB - 12KB) Pkmap : 0xff800000 – 0xffc00000 (4 MB) Vmalloc : 0xf0200000 – 0xff000000 (238 MB) Lowmem : 0x80000000 – 0xc0000000 (1GB) abiv1 CPU (CK610) is VIPT cache and it doesn't support highmem. abiv2 CPUs are all PIPT cache and they could support highmem. Lowmem is directly mapped by msa0 & msa1 reg, and we needn't setup memory page table for it. Link:https://lore.kernel.org/lkml/20180518215548.GH17671@n2100.armlinux.org.uk/ Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Christoph Hellwig <hch@infradead.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/csky/abiv1/inc/abi/page.h')
-rw-r--r--arch/csky/abiv1/inc/abi/page.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/csky/abiv1/inc/abi/page.h b/arch/csky/abiv1/inc/abi/page.h
new file mode 100644
index 000000000000..6336e92a103a
--- /dev/null
+++ b/arch/csky/abiv1/inc/abi/page.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+extern unsigned long shm_align_mask;
+extern void flush_dcache_page(struct page *page);
+
+static inline unsigned long pages_do_alias(unsigned long addr1,
+ unsigned long addr2)
+{
+ return (addr1 ^ addr2) & shm_align_mask;
+}
+
+static inline void clear_user_page(void *addr, unsigned long vaddr,
+ struct page *page)
+{
+ clear_page(addr);
+ if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
+ flush_dcache_page(page);
+}
+
+static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
+ struct page *page)
+{
+ copy_page(to, from);
+ if (pages_do_alias((unsigned long) to, vaddr & PAGE_MASK))
+ flush_dcache_page(page);
+}