diff options
Diffstat (limited to 'arch/csky/abiv2/inc/abi/pgtable-bits.h')
| -rw-r--r-- | arch/csky/abiv2/inc/abi/pgtable-bits.h | 42 |
1 files changed, 29 insertions, 13 deletions
diff --git a/arch/csky/abiv2/inc/abi/pgtable-bits.h b/arch/csky/abiv2/inc/abi/pgtable-bits.h index 137f7932c83b..526152bd2156 100644 --- a/arch/csky/abiv2/inc/abi/pgtable-bits.h +++ b/arch/csky/abiv2/inc/abi/pgtable-bits.h @@ -1,37 +1,53 @@ /* 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) + +/* We borrow bit 7 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (1<<7) /* 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) +#define _CACHE_CACHED (_PAGE_CACHE | _PAGE_BUF) +#define _CACHE_UNCACHED (0) + +#define _PAGE_PROT_NONE _PAGE_WRITE + +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTE: + * bit 0: _PAGE_GLOBAL (zero) + * bit 1: _PAGE_VALID (zero) + * bit 2 - 6: swap type + * bit 7: exclusive marker + * bit 8: swap offset[0] + * bit 9: _PAGE_WRITE (zero) + * bit 10: _PAGE_PRESENT (zero) + * bit 11 - 31: swap offset[1 - 21] + */ +#define __swp_type(x) (((x).val >> 2) & 0x1f) +#define __swp_offset(x) ((((x).val >> 8) & 0x1) | \ + (((x).val >> 10) & 0x3ffffe)) +#define __swp_entry(type, offset) ((swp_entry_t) { \ + ((type & 0x1f) << 2) | \ + ((offset & 0x1) << 8) | \ + ((offset & 0x3ffffe) << 10)}) #endif /* __ASM_CSKY_PGTABLE_BITS_H */ |