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/*
 * include/asm-xtensa/pgtable.h
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Copyright (C) 2001 - 2013 Tensilica Inc.
 */

#ifndef _XTENSA_PGTABLE_H
#define _XTENSA_PGTABLE_H

#define __ARCH_USE_5LEVEL_HACK
#include <asm-generic/pgtable-nopmd.h>
#include <asm/page.h>
#include <asm/kmem_layout.h>

/*
 * We only use two ring levels, user and kernel space.
 */

#ifdef CONFIG_MMU
#define USER_RING		1	/* user ring level */
#else
#define USER_RING		0
#endif
#define KERNEL_RING		0	/* kernel ring level */

/*
 * The Xtensa architecture port of Linux has a two-level page table system,
 * i.e. the logical three-level Linux page table layout is folded.
 * Each task has the following memory page tables:
 *
 *   PGD table (page directory), ie. 3rd-level page table:
 *	One page (4 kB) of 1024 (PTRS_PER_PGD) pointers to PTE tables
 *	(Architectures that don't have the PMD folded point to the PMD tables)
 *
 *	The pointer to the PGD table for a given task can be retrieved from
 *	the task structure (struct task_struct*) t, e.g. current():
 *	  (t->mm ? t->mm : t->active_mm)->pgd
 *
 *   PMD tables (page middle-directory), ie. 2nd-level page tables:
 *	Absent for the Xtensa architecture (folded, PTRS_PER_PMD == 1).
 *
 *   PTE tables (page table entry), ie. 1st-level page tables:
 *	One page (4 kB) of 1024 (PTRS_PER_PTE) PTEs with a special PTE
 *	invalid_pte_table for absent mappings.
 *
 * The individual pages are 4 kB big with special pages for the empty_zero_page.
 */

#define PGDIR_SHIFT	22
#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
#define PGDIR_MASK	(~(PGDIR_SIZE-1))

/*
 * Entries per page directory level: we use two-level, so
 * we don't really have any PMD directory physically.
 */
#define PTRS_PER_PTE		1024
#define PTRS_PER_PTE_SHIFT	10
#define PTRS_PER_PGD		1024
#define PGD_ORDER		0
#define USER_PTRS_PER_PGD	(TASK_SIZE/PGDIR_SIZE)
#define FIRST_USER_ADDRESS	0UL
#define FIRST_USER_PGD_NR	(FIRST_USER_ADDRESS >> PGDIR_SHIFT)

/*
 * Virtual memory area. We keep a distance to other memory regions to be
 * on the safe side. We also use this area for cache aliasing.
 */
#define VMALLOC_START		(XCHAL_KSEG_CACHED_VADDR - 0x10000000)
#define VMALLOC_END		(VMALLOC_START + 0x07FEFFFF)
#define TLBTEMP_BASE_1		(VMALLOC_END + 1)
#define TLBTEMP_BASE_2		(TLBTEMP_BASE_1 + DCACHE_WAY_SIZE)
#if 2 * DCACHE_WAY_SIZE > ICACHE_WAY_SIZE
#define TLBTEMP_SIZE		(2 * DCACHE_WAY_SIZE)
#else
#define TLBTEMP_SIZE		ICACHE_WAY_SIZE
#endif

/*
 * For the Xtensa architecture, the PTE layout is as follows:
 *
 *		31------12  11  10-9   8-6  5-4  3-2  1-0
 *		+-----------------------------------------+
 *		|           |   Software   |   HARDWARE   |
 *		|    PPN    |          ADW | RI |Attribute|
 *		+-----------------------------------------+
 *   pte_none	|             MBZ          | 01 | 11 | 00 |
 *		+-----------------------------------------+
 *   present	|    PPN    | 0 | 00 | ADW | RI | CA | wx |
 *		+- - - - - - - - - - - - - - - - - - - - -+
 *   (PAGE_NONE)|    PPN    | 0 | 00 | ADW | 01 | 11 | 11 |
 *		+-----------------------------------------+
 *   swap	|     index     |   type   | 01 | 11 | 00 |
 *		+-----------------------------------------+
 *
 * For T1050 hardware and earlier the layout differs for present and (PAGE_NONE)
 *		+-----------------------------------------+
 *   present	|    PPN    | 0 | 00 | ADW | RI | CA | w1 |
 *		+-----------------------------------------+
 *   (PAGE_NONE)|    PPN    | 0 | 00 | ADW | 01 | 01 | 00 |
 *		+-----------------------------------------+
 *
 *  Legend:
 *   PPN        Physical Page Number
 *   ADW	software: accessed (young) / dirty / writable
 *   RI         ring (0=privileged, 1=user, 2 and 3 are unused)
 *   CA		cache attribute: 00 bypass, 01 writeback, 10 writethrough
 *		(11 is invalid and used to mark pages that are not present)
 *   w		page is writable (hw)
 *   x		page is executable (hw)
 *   index      swap offset / PAGE_SIZE (bit 11-31: 21 bits -> 8 GB)
 *		(note that the index is always non-zero)
 *   type       swap type (5 bits -> 32 types)
 *
 *  Notes:
 *   - (PROT_NONE) is a special case of 'present' but causes an exception for
 *     any access (read, write, and execute).
 *   - 'multihit-exception' has the highest priority of all MMU exceptions,
 *     so the ring must be set to 'RING_USER' even for 'non-present' pages.
 *   - on older hardware, the exectuable flag was not supported and
 *     used as a 'valid' flag, so it needs to be always set.
 *   - we need to keep track of certain flags in software (dirty and young)
 *     to do this, we use write exceptions and have a separate software w-flag.
 *   - attribute value 1101 (and 1111 on T1050 and earlier) is reserved
 */

#define _PAGE_ATTRIB_MASK	0xf

#define _PAGE_HW_EXEC		(1<<0)	/* hardware: page is executable */
#define _PAGE_HW_WRITE		(1<<1)	/* hardware: page is writable */

#define _PAGE_CA_BYPASS		(0<<2)	/* bypass, non-speculative */
#define _PAGE_CA_WB		(1<<2)	/* write-back */
#define _PAGE_CA_WT		(2<<2)	/* write-through */
#define _PAGE_CA_MASK		(3<<2)
#define _PAGE_CA_INVALID	(3<<2)

/* We use invalid attribute values to distinguish special pte entries */
#if XCHAL_HW_VERSION_MAJOR < 2000
#define _PAGE_HW_VALID		0x01	/* older HW needed this bit set */
#define _PAGE_NONE		0x04
#else
#define _PAGE_HW_VALID		0x00
#define _PAGE_NONE		0x0f
#endif

#define _PAGE_USER		(1<<4)	/* user access (ring=1) */

/* Software */
#define _PAGE_WRITABLE_BIT	6
#define _PAGE_WRITABLE		(1<<6)	/* software: page writable */
#define _PAGE_DIRTY		(1<<7)	/* software: page dirty */
#define _PAGE_ACCESSED		(1<<8)	/* software: page accessed (read) */

#ifdef CONFIG_MMU

#define _PAGE_CHG_MASK	   (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
#define _PAGE_PRESENT	   (_PAGE_HW_VALID | _PAGE_CA_WB | _PAGE_ACCESSED)

#define PAGE_NONE	   __pgprot(_PAGE_NONE | _PAGE_USER)
#define PAGE_COPY	   __pgprot(_PAGE_PRESENT | _PAGE_USER)
#define PAGE_COPY_EXEC	   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_HW_EXEC)
#define PAGE_READONLY	   __pgprot(_PAGE_PRESENT | _PAGE_USER)
#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_HW_EXEC)
#define PAGE_SHARED	   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITABLE)
#define PAGE_SHARED_EXEC \
	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITABLE | _PAGE_HW_EXEC)
#define PAGE_KERNEL	   __pgprot(_PAGE_PRESENT | _PAGE_HW_WRITE)
#define PAGE_KERNEL_EXEC   __pgprot(_PAGE_PRESENT|_PAGE_HW_WRITE|_PAGE_HW_EXEC)

#if (DCACHE_WAY_SIZE > PAGE_SIZE)
# define _PAGE_DIRECTORY   (_PAGE_HW_VALID | _PAGE_ACCESSED | _PAGE_CA_BYPASS)
#else
# define _PAGE_DIRECTORY   (_PAGE_HW_VALID | _PAGE_ACCESSED | _PAGE_CA_WB)
#endif

#else /* no mmu */

# define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
# define PAGE_NONE       __pgprot(0)
# define PAGE_SHARED     __pgprot(0)
# define PAGE_COPY       __pgprot(0)
# define PAGE_READONLY   __pgprot(0)
# define PAGE_KERNEL     __pgprot(0)

#endif

/*
 * On certain configurations of Xtensa MMUs (eg. the initial Linux config),
 * the MMU can't do page protection for execute, and considers that the same as
 * read.  Also, write permissions may imply read permissions.
 * What follows is the closest we can get by reasonable means..
 * See linux/mm/mmap.c for protection_map[] array that uses these definitions.
 */
#define __P000	PAGE_NONE		/* private --- */
#define __P001	PAGE_READONLY		/* private --r */
#define __P010	PAGE_COPY		/* private -w- */
#define __P011	PAGE_COPY		/* private -wr */
#define __P100	PAGE_READONLY_EXEC	/* private x-- */
#define __P101	PAGE_READONLY_EXEC	/* private x-r */
#define __P110	PAGE_COPY_EXEC		/* private xw- */
#define __P111	PAGE_COPY_EXEC		/* private xwr */

#define __S000	PAGE_NONE		/* shared  --- */
#define __S001	PAGE_READONLY		/* shared  --r */
#define __S010	PAGE_SHARED		/* shared  -w- */
#define __S011	PAGE_SHARED		/* shared  -wr */
#define __S100	PAGE_READONLY_EXEC	/* shared  x-- */
#define __S101	PAGE_READONLY_EXEC	/* shared  x-r */
#define __S110	PAGE_SHARED_EXEC	/* shared  xw- */
#define __S111	PAGE_SHARED_EXEC	/* shared  xwr */

#ifndef __ASSEMBLY__

#define pte_ERROR(e) \
	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
#define pgd_ERROR(e) \
	printk("%s:%d: bad pgd entry %08lx.\n", __FILE__, __LINE__, pgd_val(e))

extern unsigned long empty_zero_page[1024];

#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))

#ifdef CONFIG_MMU
extern pgd_t swapper_pg_dir[PAGE_SIZE/sizeof(pgd_t)];
extern void paging_init(void);
#else
# define swapper_pg_dir NULL
static inline void paging_init(void) { }
#endif
static inline void pgtable_cache_init(void) { }

/*
 * The pmd contains the kernel virtual address of the pte page.
 */
#define pmd_page_vaddr(pmd) ((unsigned long)(pmd_val(pmd) & PAGE_MASK))
#define pmd_page(pmd) virt_to_page(pmd_val(pmd))

/*
 * pte status.
 */
# define pte_none(pte)	 (pte_val(pte) == (_PAGE_CA_INVALID | _PAGE_USER))
#if XCHAL_HW_VERSION_MAJOR < 2000
# define pte_present(pte) ((pte_val(pte) & _PAGE_CA_MASK) != _PAGE_CA_INVALID)
#else
# define pte_present(pte)						\
	(((pte_val(pte) & _PAGE_CA_MASK) != _PAGE_CA_INVALID)		\
	 || ((pte_val(pte) & _PAGE_ATTRIB_MASK) == _PAGE_NONE))
#endif
#define pte_clear(mm,addr,ptep)						\
	do { update_pte(ptep, __pte(_PAGE_CA_INVALID | _PAGE_USER)); } while (0)

#define pmd_none(pmd)	 (!pmd_val(pmd))
#define pmd_present(pmd) (pmd_val(pmd) & PAGE_MASK)
#define pmd_bad(pmd)	 (pmd_val(pmd) & ~PAGE_MASK)
#define pmd_clear(pmdp)	 do { set_pmd(pmdp, __pmd(0)); } while (0)

static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITABLE; }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_special(pte_t pte) { return 0; }

static inline pte_t pte_wrprotect(pte_t pte)	
	{ pte_val(pte) &= ~(_PAGE_WRITABLE | _PAGE_HW_WRITE); return pte; }
static inline pte_t pte_mkclean(pte_t pte)
	{ pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HW_WRITE); return pte; }
static inline pte_t pte_mkold(pte_t pte)
	{ pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
static inline pte_t pte_mkdirty(pte_t pte)
	{ pte_val(pte) |= _PAGE_DIRTY; return pte; }
static inline pte_t pte_mkyoung(pte_t pte)
	{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
static inline pte_t pte_mkwrite(pte_t pte)
	{ pte_val(pte) |= _PAGE_WRITABLE; return pte; }
static inline pte_t pte_mkspecial(pte_t pte)
	{ return pte; }

#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) & ~_PAGE_CA_MASK))

/*
 * Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */

#define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
#define pte_same(a,b)		(pte_val(a) == pte_val(b))
#define pte_page(x)		pfn_to_page(pte_pfn(x))
#define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define mk_pte(page, prot)	pfn_pte(page_to_pfn(page), prot)

static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
}

/*
 * Certain architectures need to do special things when pte's
 * within a page table are directly modified.  Thus, the following
 * hook is made available.
 */
static inline void update_pte(pte_t *ptep, pte_t pteval)
{
	*ptep = pteval;
#if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK
	__asm__ __volatile__ ("dhwb %0, 0" :: "a" (ptep));
#endif

}

struct mm_struct;

static inline void
set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pteval)
{
	update_pte(ptep, pteval);
}

static inline void set_pte(pte_t *ptep, pte_t pteval)
{
	update_pte(ptep, pteval);
}

static inline void
set_pmd(pmd_t *pmdp, pmd_t pmdval)
{
	*pmdp = pmdval;
}

struct vm_area_struct;

static inline int
ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr,
			  pte_t *ptep)
{
	pte_t pte = *ptep;
	if (!pte_young(pte))
		return 0;
	update_pte(ptep, pte_mkold(pte));
	return 1;
}

static inline pte_t
ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
	pte_t pte = *ptep;
	pte_clear(mm, addr, ptep);
	return pte;
}

static inline void
ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
	pte_t pte = *ptep;
	update_pte(ptep, pte_wrprotect(pte));
}

/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(address)	pgd_offset(&init_mm, address)

/* to find an entry in a page-table-directory */
#define pgd_offset(mm,address)	((mm)->pgd + pgd_index(address))

#define pgd_index(address)	((address) >> PGDIR_SHIFT)

/* Find an entry in the second-level page table.. */
#define pmd_offset(dir,address) ((pmd_t*)(dir))

/* Find an entry in the third-level page table.. */
#define pte_index(address)	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset_kernel(dir,addr) 					\
	((pte_t*) pmd_page_vaddr(*(dir)) + pte_index(addr))
#define pte_offset_map(dir,addr)	pte_offset_kernel((dir),(addr))
#define pte_unmap(pte)		do { } while (0)


/*
 * Encode and decode a swap and file entry.
 */
#define SWP_TYPE_BITS		5
#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)

#define __swp_type(entry)	(((entry).val >> 6) & 0x1f)
#define __swp_offset(entry)	((entry).val >> 11)
#define __swp_entry(type,offs)	\
	((swp_entry_t){((type) << 6) | ((offs) << 11) | \
	 _PAGE_CA_INVALID | _PAGE_USER})
#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)	((pte_t) { (x).val })

#endif /*  !defined (__ASSEMBLY__) */


#ifdef __ASSEMBLY__

/* Assembly macro _PGD_INDEX is the same as C pgd_index(unsigned long),
 *                _PGD_OFFSET as C pgd_offset(struct mm_struct*, unsigned long),
 *                _PMD_OFFSET as C pmd_offset(pgd_t*, unsigned long)
 *                _PTE_OFFSET as C pte_offset(pmd_t*, unsigned long)
 *
 * Note: We require an additional temporary register which can be the same as
 *       the register that holds the address.
 *
 * ((pte_t*) ((unsigned long)(pmd_val(*pmd) & PAGE_MASK)) + pte_index(addr))
 *
 */
#define _PGD_INDEX(rt,rs)	extui	rt, rs, PGDIR_SHIFT, 32-PGDIR_SHIFT
#define _PTE_INDEX(rt,rs)	extui	rt, rs, PAGE_SHIFT, PTRS_PER_PTE_SHIFT

#define _PGD_OFFSET(mm,adr,tmp)		l32i	mm, mm, MM_PGD;		\
					_PGD_INDEX(tmp, adr);		\
					addx4	mm, tmp, mm

#define _PTE_OFFSET(pmd,adr,tmp)	_PTE_INDEX(tmp, adr);		\
					srli	pmd, pmd, PAGE_SHIFT;	\
					slli	pmd, pmd, PAGE_SHIFT;	\
					addx4	pmd, tmp, pmd

#else

#define kern_addr_valid(addr)	(1)

extern  void update_mmu_cache(struct vm_area_struct * vma,
			      unsigned long address, pte_t *ptep);

typedef pte_t *pte_addr_t;

#endif /* !defined (__ASSEMBLY__) */

#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
#define __HAVE_ARCH_PTEP_MKDIRTY
#define __HAVE_ARCH_PTE_SAME
/* We provide our own get_unmapped_area to cope with
 * SHM area cache aliasing for userland.
 */
#define HAVE_ARCH_UNMAPPED_AREA

#include <asm-generic/pgtable.h>

#endif /* _XTENSA_PGTABLE_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 685 B 0644
asm-offsets.h File 35 B 0644
asm-uaccess.h File 4.11 KB 0644
asmmacro.h File 2.76 KB 0644
atomic.h File 7.38 KB 0644
barrier.h File 542 B 0644
bitops.h File 5.08 KB 0644
bootparam.h File 1.37 KB 0644
bugs.h File 451 B 0644
cache.h File 969 B 0644
cacheasm.h File 3.77 KB 0644
cacheflush.h File 5.76 KB 0644
checksum.h File 6 KB 0644
cmpxchg.h File 3.9 KB 0644
coprocessor.h File 5.05 KB 0644
current.h File 675 B 0644
delay.h File 1.63 KB 0644
dma-mapping.h File 855 B 0644
dma.h File 1.79 KB 0644
elf.h File 5.75 KB 0644
fixmap.h File 2.5 KB 0644
flat.h File 686 B 0644
ftrace.h File 979 B 0644
futex.h File 2.59 KB 0644
highmem.h File 2.33 KB 0644
hw_breakpoint.h File 1.45 KB 0644
hw_irq.h File 320 B 0644
initialize_mmu.h File 4.58 KB 0644
io.h File 2.09 KB 0644
irq.h File 1.46 KB 0644
irqflags.h File 1.99 KB 0644
kmem_layout.h File 2.07 KB 0644
mmu.h File 462 B 0644
mmu_context.h File 3.62 KB 0644
module.h File 525 B 0644
mxregs.h File 1.3 KB 0644
nommu_context.h File 602 B 0644
page.h File 5.69 KB 0644
pci-bridge.h File 2.16 KB 0644
pci.h File 1.37 KB 0644
perf_event.h File 108 B 0644
pgalloc.h File 1.84 KB 0644
pgtable.h File 14.89 KB 0644
platform.h File 1.75 KB 0644
processor.h File 7.44 KB 0644
ptrace.h File 3.74 KB 0644
regs.h File 3.87 KB 0644
segment.h File 376 B 0644
serial.h File 443 B 0644
shmparam.h File 561 B 0644
signal.h File 502 B 0644
smp.h File 967 B 0644
spinlock.h File 4.6 KB 0644
spinlock_types.h File 412 B 0644
stacktrace.h File 1.13 KB 0644
string.h File 2.65 KB 0644
switch_to.h File 601 B 0644
syscall.h File 982 B 0644
sysmem.h File 426 B 0644
thread_info.h File 3.62 KB 0644
timex.h File 1.79 KB 0644
tlb.h File 1.1 KB 0644
tlbflush.h File 5.53 KB 0644
traps.h File 1.87 KB 0644
types.h File 501 B 0644
uaccess.h File 8.67 KB 0644
ucontext.h File 540 B 0644
unaligned.h File 864 B 0644
unistd.h File 639 B 0644
user.h File 507 B 0644
vectors.h File 4.05 KB 0644
vga.h File 434 B 0644