diff options
Diffstat (limited to 'arch/csky/abiv1/inc/abi/pgtable-bits.h')
| -rw-r--r-- | arch/csky/abiv1/inc/abi/pgtable-bits.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/csky/abiv1/inc/abi/pgtable-bits.h b/arch/csky/abiv1/inc/abi/pgtable-bits.h new file mode 100644 index 000000000..ae7a2f76d --- /dev/null +++ b/arch/csky/abiv1/inc/abi/pgtable-bits.h @@ -0,0 +1,55 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __ASM_CSKY_PGTABLE_BITS_H +#define __ASM_CSKY_PGTABLE_BITS_H + +/* implemented in software */ +#define _PAGE_PRESENT (1<<0) +#define _PAGE_READ (1<<1) +#define _PAGE_WRITE (1<<2) +#define _PAGE_ACCESSED (1<<3) +#define _PAGE_MODIFIED (1<<4) + +/* We borrow bit 9 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (1<<9) + +/* implemented in hardware */ +#define _PAGE_GLOBAL (1<<6) +#define _PAGE_VALID (1<<7) +#define _PAGE_DIRTY (1<<8) + +#define _PAGE_CACHE (3<<9) +#define _PAGE_UNCACHE (2<<9) +#define _PAGE_SO _PAGE_UNCACHE +#define _CACHE_MASK (7<<9) + +#define _CACHE_CACHED _PAGE_CACHE +#define _CACHE_UNCACHED _PAGE_UNCACHE + +#define _PAGE_PROT_NONE _PAGE_READ + +/* + * 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_PRESENT (zero) + * bit 1: _PAGE_READ (zero) + * bit 2 - 5: swap type[0 - 3] + * bit 6: _PAGE_GLOBAL (zero) + * bit 7: _PAGE_VALID (zero) + * bit 8: swap type[4] + * bit 9: exclusive marker + * bit 10 - 31: swap offset + */ +#define __swp_type(x) ((((x).val >> 2) & 0xf) | \ + (((x).val >> 4) & 0x10)) +#define __swp_offset(x) ((x).val >> 10) +#define __swp_entry(type, offset) ((swp_entry_t) { \ + ((type & 0xf) << 2) | \ + ((type & 0x10) << 4) | \ + ((offset) << 10)}) + +#define HAVE_ARCH_UNMAPPED_AREA + +#endif /* __ASM_CSKY_PGTABLE_BITS_H */ |