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linux/arch/m68k/include/asm/mcf_pgtable.h
Mike Rapoport 974b9b2c68 mm: consolidate pte_index() and pte_offset_*() definitions 
All architectures define pte_index() as

	(address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)

and all architectures define pte_offset_kernel() as an entry in the array
of PTEs indexed by the pte_index().

For the most architectures the pte_offset_kernel() implementation relies
on the availability of pmd_page_vaddr() that converts a PMD entry value to
the virtual address of the page containing PTEs array.

Let's move x86 definitions of the PTE accessors to the generic place in
<linux/pgtable.h> and then simply drop the respective definitions from the
other architectures.

The architectures that didn't provide pmd_page_vaddr() are updated to have
that defined.

The generic implementation of pte_offset_kernel() can be overridden by an
architecture and alpha makes use of this because it has special ordering
requirements for its version of pte_offset_kernel().

[rppt@linux.ibm.com: v2]
  Link: http://lkml.kernel.org/r/20200514170327.31389-11-rppt@kernel.org
[rppt@linux.ibm.com: update]
  Link: http://lkml.kernel.org/r/20200514170327.31389-12-rppt@kernel.org
[rppt@linux.ibm.com: update]
  Link: http://lkml.kernel.org/r/20200514170327.31389-13-rppt@kernel.org
[akpm@linux-foundation.org: fix x86 warning]
[sfr@canb.auug.org.au: fix powerpc build]
  Link: http://lkml.kernel.org/r/20200607153443.GB738695@linux.ibm.com

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200514170327.31389-10-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-09 09:39:14 -07:00

330 lines
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _MCF_PGTABLE_H
#define _MCF_PGTABLE_H
#include <asm/mcfmmu.h>
#include <asm/page.h>
/*
* MMUDR bits, in proper place. We write these directly into the MMUDR
* after masking from the pte.
*/
#define CF_PAGE_LOCKED MMUDR_LK /* 0x00000002 */
#define CF_PAGE_EXEC MMUDR_X /* 0x00000004 */
#define CF_PAGE_WRITABLE MMUDR_W /* 0x00000008 */
#define CF_PAGE_READABLE MMUDR_R /* 0x00000010 */
#define CF_PAGE_SYSTEM MMUDR_SP /* 0x00000020 */
#define CF_PAGE_COPYBACK MMUDR_CM_CCB /* 0x00000040 */
#define CF_PAGE_NOCACHE MMUDR_CM_NCP /* 0x00000080 */
#define CF_CACHEMASK (~MMUDR_CM_CCB)
#define CF_PAGE_MMUDR_MASK 0x000000fe
#define _PAGE_NOCACHE030 CF_PAGE_NOCACHE
/*
* MMUTR bits, need shifting down.
*/
#define CF_PAGE_MMUTR_MASK 0x00000c00
#define CF_PAGE_MMUTR_SHIFT 10
#define CF_PAGE_VALID (MMUTR_V << CF_PAGE_MMUTR_SHIFT)
#define CF_PAGE_SHARED (MMUTR_SG << CF_PAGE_MMUTR_SHIFT)
/*
* Fake bits, not implemented in CF, will get masked out before
* hitting hardware.
*/
#define CF_PAGE_DIRTY 0x00000001
#define CF_PAGE_ACCESSED 0x00001000
#define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */
#define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */
#define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */
#define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */
#define _DESCTYPE_MASK 0x003
#define _CACHEMASK040 (~0x060)
#define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */
/*
* Externally used page protection values.
*/
#define _PAGE_PRESENT (CF_PAGE_VALID)
#define _PAGE_ACCESSED (CF_PAGE_ACCESSED)
#define _PAGE_DIRTY (CF_PAGE_DIRTY)
#define _PAGE_READWRITE (CF_PAGE_READABLE \
| CF_PAGE_WRITABLE \
| CF_PAGE_SYSTEM \
| CF_PAGE_SHARED)
/*
* Compound page protection values.
*/
#define PAGE_NONE __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED)
#define PAGE_SHARED __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_SHARED)
#define PAGE_INIT __pgprot(CF_PAGE_VALID \
| CF_PAGE_READABLE \
| CF_PAGE_WRITABLE \
| CF_PAGE_EXEC \
| CF_PAGE_SYSTEM)
#define PAGE_KERNEL __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_WRITABLE \
| CF_PAGE_EXEC \
| CF_PAGE_SYSTEM \
| CF_PAGE_SHARED)
#define PAGE_COPY __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_DIRTY)
/*
* Page protections for initialising protection_map. See mm/mmap.c
* for use. In general, the bit positions are xwr, and P-items are
* private, the S-items are shared.
*/
#define __P000 PAGE_NONE
#define __P001 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE)
#define __P010 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_WRITABLE)
#define __P011 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_WRITABLE)
#define __P100 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_EXEC)
#define __P101 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_EXEC)
#define __P110 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_WRITABLE \
| CF_PAGE_EXEC)
#define __P111 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_WRITABLE \
| CF_PAGE_EXEC)
#define __S000 PAGE_NONE
#define __S001 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE)
#define __S010 PAGE_SHARED
#define __S011 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_SHARED \
| CF_PAGE_READABLE)
#define __S100 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_EXEC)
#define __S101 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_EXEC)
#define __S110 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_SHARED \
| CF_PAGE_EXEC)
#define __S111 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_SHARED \
| CF_PAGE_READABLE \
| CF_PAGE_EXEC)
#define PTE_MASK PAGE_MASK
#define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
#ifndef __ASSEMBLY__
/*
* 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 mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
return pte;
}
#define pmd_set(pmdp, ptep) do {} while (0)
static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
{
pgd_val(*pgdp) = virt_to_phys(pmdp);
}
#define __pte_page(pte) ((unsigned long) (pte_val(pte) & PAGE_MASK))
#define pmd_page_vaddr(pmd) ((unsigned long) (pmd_val(pmd)))
static inline int pte_none(pte_t pte)
{
return !pte_val(pte);
}
static inline int pte_present(pte_t pte)
{
return pte_val(pte) & CF_PAGE_VALID;
}
static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
pte_val(*ptep) = 0;
}
#define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
#define pte_page(pte) virt_to_page(__pte_page(pte))
static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
#define pmd_none(pmd) pmd_none2(&(pmd))
static inline int pmd_bad2(pmd_t *pmd) { return 0; }
#define pmd_bad(pmd) pmd_bad2(&(pmd))
#define pmd_present(pmd) (!pmd_none2(&(pmd)))
static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
#define pte_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
__FILE__, __LINE__, pte_val(e))
#define pgd_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
__FILE__, __LINE__, pgd_val(e))
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not...
* [we have the full set here even if they don't change from m68k]
*/
static inline int pte_read(pte_t pte)
{
return pte_val(pte) & CF_PAGE_READABLE;
}
static inline int pte_write(pte_t pte)
{
return pte_val(pte) & CF_PAGE_WRITABLE;
}
static inline int pte_exec(pte_t pte)
{
return pte_val(pte) & CF_PAGE_EXEC;
}
static inline int pte_dirty(pte_t pte)
{
return pte_val(pte) & CF_PAGE_DIRTY;
}
static inline int pte_young(pte_t pte)
{
return pte_val(pte) & CF_PAGE_ACCESSED;
}
static inline pte_t pte_wrprotect(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_WRITABLE;
return pte;
}
static inline pte_t pte_rdprotect(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_READABLE;
return pte;
}
static inline pte_t pte_exprotect(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_EXEC;
return pte;
}
static inline pte_t pte_mkclean(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_DIRTY;
return pte;
}
static inline pte_t pte_mkold(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_ACCESSED;
return pte;
}
static inline pte_t pte_mkwrite(pte_t pte)
{
pte_val(pte) |= CF_PAGE_WRITABLE;
return pte;
}
static inline pte_t pte_mkread(pte_t pte)
{
pte_val(pte) |= CF_PAGE_READABLE;
return pte;
}
static inline pte_t pte_mkexec(pte_t pte)
{
pte_val(pte) |= CF_PAGE_EXEC;
return pte;
}
static inline pte_t pte_mkdirty(pte_t pte)
{
pte_val(pte) |= CF_PAGE_DIRTY;
return pte;
}
static inline pte_t pte_mkyoung(pte_t pte)
{
pte_val(pte) |= CF_PAGE_ACCESSED;
return pte;
}
static inline pte_t pte_mknocache(pte_t pte)
{
pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
return pte;
}
static inline pte_t pte_mkcache(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_NOCACHE;
return pte;
}
#define swapper_pg_dir kernel_pg_dir
extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
/*
* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e))
*/
#define __swp_type(x) ((x).val & 0xFF)
#define __swp_offset(x) ((x).val >> 11)
#define __swp_entry(typ, off) ((swp_entry_t) { (typ) | \
(off << 11) })
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x) (__pte((x).val))
#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
#endif /* !__ASSEMBLY__ */
#endif /* _MCF_PGTABLE_H */
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