From 013de2d6671d89de3397904749c86a69ac0686f7 Mon Sep 17 00:00:00 2001 From: Guo Ren Date: Wed, 5 Sep 2018 14:25:12 +0800 Subject: csky: MMU and page table management MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Cc: Christoph Hellwig Reviewed-by: Arnd Bergmann --- arch/csky/abiv2/inc/abi/ckmmu.h | 87 ++++++++++++++++++++++++++++++++++ arch/csky/abiv2/inc/abi/page.h | 14 ++++++ arch/csky/abiv2/inc/abi/pgtable-bits.h | 37 +++++++++++++++ 3 files changed, 138 insertions(+) create mode 100644 arch/csky/abiv2/inc/abi/ckmmu.h create mode 100644 arch/csky/abiv2/inc/abi/page.h create mode 100644 arch/csky/abiv2/inc/abi/pgtable-bits.h (limited to 'arch/csky/abiv2') diff --git a/arch/csky/abiv2/inc/abi/ckmmu.h b/arch/csky/abiv2/inc/abi/ckmmu.h new file mode 100644 index 000000000000..97230ad9427c --- /dev/null +++ b/arch/csky/abiv2/inc/abi/ckmmu.h @@ -0,0 +1,87 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_CKMMUV2_H +#define __ASM_CSKY_CKMMUV2_H + +#include +#include + +static inline int read_mmu_index(void) +{ + return mfcr("cr<0, 15>"); +} + +static inline void write_mmu_index(int value) +{ + mtcr("cr<0, 15>", value); +} + +static inline int read_mmu_entrylo0(void) +{ + return mfcr("cr<2, 15>"); +} + +static inline int read_mmu_entrylo1(void) +{ + return mfcr("cr<3, 15>"); +} + +static inline void write_mmu_pagemask(int value) +{ + mtcr("cr<6, 15>", value); +} + +static inline int read_mmu_entryhi(void) +{ + return mfcr("cr<4, 15>"); +} + +static inline void write_mmu_entryhi(int value) +{ + mtcr("cr<4, 15>", value); +} + +/* + * TLB operations. + */ +static inline void tlb_probe(void) +{ + mtcr("cr<8, 15>", 0x80000000); +} + +static inline void tlb_read(void) +{ + mtcr("cr<8, 15>", 0x40000000); +} + +static inline void tlb_invalid_all(void) +{ +#ifdef CONFIG_CPU_HAS_TLBI + asm volatile("tlbi.alls\n":::"memory"); + sync_is(); +#else + mtcr("cr<8, 15>", 0x04000000); +#endif +} + +static inline void tlb_invalid_indexed(void) +{ + mtcr("cr<8, 15>", 0x02000000); +} + +/* setup hardrefil pgd */ +static inline unsigned long get_pgd(void) +{ + return mfcr("cr<29, 15>"); +} + +static inline void setup_pgd(unsigned long pgd, bool kernel) +{ + if (kernel) + mtcr("cr<28, 15>", pgd); + else + mtcr("cr<29, 15>", pgd); +} + +#endif /* __ASM_CSKY_CKMMUV2_H */ diff --git a/arch/csky/abiv2/inc/abi/page.h b/arch/csky/abiv2/inc/abi/page.h new file mode 100644 index 000000000000..0a70cb553dca --- /dev/null +++ b/arch/csky/abiv2/inc/abi/page.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +static inline void clear_user_page(void *addr, unsigned long vaddr, + struct page *page) +{ + clear_page(addr); +} + +static inline void copy_user_page(void *to, void *from, unsigned long vaddr, + struct page *page) +{ + copy_page(to, from); +} diff --git a/arch/csky/abiv2/inc/abi/pgtable-bits.h b/arch/csky/abiv2/inc/abi/pgtable-bits.h new file mode 100644 index 000000000000..b20ae19702e3 --- /dev/null +++ b/arch/csky/abiv2/inc/abi/pgtable-bits.h @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_PGTABLE_BITS_H +#define __ASM_CSKY_PGTABLE_BITS_H + +/* implemented in software */ +#define _PAGE_ACCESSED (1<<7) +#define PAGE_ACCESSED_BIT (7) + +#define _PAGE_READ (1<<8) +#define _PAGE_WRITE (1<<9) +#define _PAGE_PRESENT (1<<10) + +#define _PAGE_MODIFIED (1<<11) +#define PAGE_MODIFIED_BIT (11) + +/* implemented in hardware */ +#define _PAGE_GLOBAL (1<<0) + +#define _PAGE_VALID (1<<1) +#define PAGE_VALID_BIT (1) + +#define _PAGE_DIRTY (1<<2) +#define PAGE_DIRTY_BIT (2) + +#define _PAGE_SO (1<<5) +#define _PAGE_BUF (1<<6) + +#define _PAGE_CACHE (1<<3) + +#define _CACHE_MASK _PAGE_CACHE + +#define _CACHE_CACHED (_PAGE_VALID | _PAGE_CACHE | _PAGE_BUF) +#define _CACHE_UNCACHED (_PAGE_VALID | _PAGE_SO) + +#endif /* __ASM_CSKY_PGTABLE_BITS_H */ -- cgit