mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-20 14:16:02 +00:00
![Mike Rapoport](/assets/img/avatar_default.png)
32-bit version of sparc has three-level page tables and can use pgtable-nopud and folding of the upper layers. Replace usage of include/asm-generic/4level-fixup.h with include/asm-generic/pgtable-nopud.h and adjust page table manipulation macros and functions accordingly. Link: http://lkml.kernel.org/r/1572938135-31886-11-git-send-email-rppt@kernel.org Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: David S. Miller <davem@davemloft.net> Tested-by: Anatoly Pugachev <matorola@gmail.com> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Helge Deller <deller@gmx.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Mark Salter <msalter@redhat.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Peter Rosin <peda@axentia.se> Cc: Richard Weinberger <richard@nod.at> Cc: Rolf Eike Beer <eike-kernel@sf-tec.de> Cc: Russell King <linux@armlinux.org.uk> Cc: Russell King <rmk+kernel@armlinux.org.uk> Cc: Sam Creasey <sammy@sammy.net> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
448 lines
11 KiB
C
448 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _SPARC_PGTABLE_H
|
|
#define _SPARC_PGTABLE_H
|
|
|
|
/* asm/pgtable.h: Defines and functions used to work
|
|
* with Sparc page tables.
|
|
*
|
|
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
|
|
* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
|
|
*/
|
|
|
|
#include <linux/const.h>
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <asm-generic/pgtable-nopud.h>
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/mm_types.h>
|
|
#include <asm/types.h>
|
|
#include <asm/pgtsrmmu.h>
|
|
#include <asm/vaddrs.h>
|
|
#include <asm/oplib.h>
|
|
#include <asm/cpu_type.h>
|
|
|
|
|
|
struct vm_area_struct;
|
|
struct page;
|
|
|
|
void load_mmu(void);
|
|
unsigned long calc_highpages(void);
|
|
unsigned long __init bootmem_init(unsigned long *pages_avail);
|
|
|
|
#define pte_ERROR(e) __builtin_trap()
|
|
#define pmd_ERROR(e) __builtin_trap()
|
|
#define pgd_ERROR(e) __builtin_trap()
|
|
|
|
#define PMD_SHIFT 22
|
|
#define PMD_SIZE (1UL << PMD_SHIFT)
|
|
#define PMD_MASK (~(PMD_SIZE-1))
|
|
#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
|
|
#define PGDIR_SHIFT SRMMU_PGDIR_SHIFT
|
|
#define PGDIR_SIZE SRMMU_PGDIR_SIZE
|
|
#define PGDIR_MASK SRMMU_PGDIR_MASK
|
|
#define PTRS_PER_PTE 1024
|
|
#define PTRS_PER_PMD SRMMU_PTRS_PER_PMD
|
|
#define PTRS_PER_PGD SRMMU_PTRS_PER_PGD
|
|
#define USER_PTRS_PER_PGD PAGE_OFFSET / SRMMU_PGDIR_SIZE
|
|
#define FIRST_USER_ADDRESS 0UL
|
|
#define PTE_SIZE (PTRS_PER_PTE*4)
|
|
|
|
#define PAGE_NONE SRMMU_PAGE_NONE
|
|
#define PAGE_SHARED SRMMU_PAGE_SHARED
|
|
#define PAGE_COPY SRMMU_PAGE_COPY
|
|
#define PAGE_READONLY SRMMU_PAGE_RDONLY
|
|
#define PAGE_KERNEL SRMMU_PAGE_KERNEL
|
|
|
|
/* Top-level page directory - dummy used by init-mm.
|
|
* srmmu.c will assign the real one (which is dynamically sized) */
|
|
#define swapper_pg_dir NULL
|
|
|
|
void paging_init(void);
|
|
|
|
extern unsigned long ptr_in_current_pgd;
|
|
|
|
/* xwr */
|
|
#define __P000 PAGE_NONE
|
|
#define __P001 PAGE_READONLY
|
|
#define __P010 PAGE_COPY
|
|
#define __P011 PAGE_COPY
|
|
#define __P100 PAGE_READONLY
|
|
#define __P101 PAGE_READONLY
|
|
#define __P110 PAGE_COPY
|
|
#define __P111 PAGE_COPY
|
|
|
|
#define __S000 PAGE_NONE
|
|
#define __S001 PAGE_READONLY
|
|
#define __S010 PAGE_SHARED
|
|
#define __S011 PAGE_SHARED
|
|
#define __S100 PAGE_READONLY
|
|
#define __S101 PAGE_READONLY
|
|
#define __S110 PAGE_SHARED
|
|
#define __S111 PAGE_SHARED
|
|
|
|
/* First physical page can be anywhere, the following is needed so that
|
|
* va-->pa and vice versa conversions work properly without performance
|
|
* hit for all __pa()/__va() operations.
|
|
*/
|
|
extern unsigned long phys_base;
|
|
extern unsigned long pfn_base;
|
|
|
|
/*
|
|
* ZERO_PAGE is a global shared page that is always zero: used
|
|
* for zero-mapped memory areas etc..
|
|
*/
|
|
extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
|
|
|
|
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
|
|
|
|
/*
|
|
* In general all page table modifications should use the V8 atomic
|
|
* swap instruction. This insures the mmu and the cpu are in sync
|
|
* with respect to ref/mod bits in the page tables.
|
|
*/
|
|
static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value)
|
|
{
|
|
__asm__ __volatile__("swap [%2], %0" :
|
|
"=&r" (value) : "0" (value), "r" (addr) : "memory");
|
|
return value;
|
|
}
|
|
|
|
/* 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 set_pte(pte_t *ptep, pte_t pteval)
|
|
{
|
|
srmmu_swap((unsigned long *)ptep, pte_val(pteval));
|
|
}
|
|
|
|
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
|
|
|
|
static inline int srmmu_device_memory(unsigned long x)
|
|
{
|
|
return ((x & 0xF0000000) != 0);
|
|
}
|
|
|
|
static inline struct page *pmd_page(pmd_t pmd)
|
|
{
|
|
if (srmmu_device_memory(pmd_val(pmd)))
|
|
BUG();
|
|
return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4));
|
|
}
|
|
|
|
static inline unsigned long pud_page_vaddr(pud_t pud)
|
|
{
|
|
if (srmmu_device_memory(pud_val(pud))) {
|
|
return ~0;
|
|
} else {
|
|
unsigned long v = pud_val(pud) & SRMMU_PTD_PMASK;
|
|
return (unsigned long)__nocache_va(v << 4);
|
|
}
|
|
}
|
|
|
|
static inline int pte_present(pte_t pte)
|
|
{
|
|
return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE);
|
|
}
|
|
|
|
static inline int pte_none(pte_t pte)
|
|
{
|
|
return !pte_val(pte);
|
|
}
|
|
|
|
static inline void __pte_clear(pte_t *ptep)
|
|
{
|
|
set_pte(ptep, __pte(0));
|
|
}
|
|
|
|
static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
|
|
{
|
|
__pte_clear(ptep);
|
|
}
|
|
|
|
static inline int pmd_bad(pmd_t pmd)
|
|
{
|
|
return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
|
|
}
|
|
|
|
static inline int pmd_present(pmd_t pmd)
|
|
{
|
|
return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
|
|
}
|
|
|
|
static inline int pmd_none(pmd_t pmd)
|
|
{
|
|
return !pmd_val(pmd);
|
|
}
|
|
|
|
static inline void pmd_clear(pmd_t *pmdp)
|
|
{
|
|
int i;
|
|
for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++)
|
|
set_pte((pte_t *)&pmdp->pmdv[i], __pte(0));
|
|
}
|
|
|
|
static inline int pud_none(pud_t pud)
|
|
{
|
|
return !(pud_val(pud) & 0xFFFFFFF);
|
|
}
|
|
|
|
static inline int pud_bad(pud_t pud)
|
|
{
|
|
return (pud_val(pud) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
|
|
}
|
|
|
|
static inline int pud_present(pud_t pud)
|
|
{
|
|
return ((pud_val(pud) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
|
|
}
|
|
|
|
static inline void pud_clear(pud_t *pudp)
|
|
{
|
|
set_pte((pte_t *)pudp, __pte(0));
|
|
}
|
|
|
|
/*
|
|
* The following only work if pte_present() is true.
|
|
* Undefined behaviour if not..
|
|
*/
|
|
static inline int pte_write(pte_t pte)
|
|
{
|
|
return pte_val(pte) & SRMMU_WRITE;
|
|
}
|
|
|
|
static inline int pte_dirty(pte_t pte)
|
|
{
|
|
return pte_val(pte) & SRMMU_DIRTY;
|
|
}
|
|
|
|
static inline int pte_young(pte_t pte)
|
|
{
|
|
return pte_val(pte) & SRMMU_REF;
|
|
}
|
|
|
|
static inline int pte_special(pte_t pte)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline pte_t pte_wrprotect(pte_t pte)
|
|
{
|
|
return __pte(pte_val(pte) & ~SRMMU_WRITE);
|
|
}
|
|
|
|
static inline pte_t pte_mkclean(pte_t pte)
|
|
{
|
|
return __pte(pte_val(pte) & ~SRMMU_DIRTY);
|
|
}
|
|
|
|
static inline pte_t pte_mkold(pte_t pte)
|
|
{
|
|
return __pte(pte_val(pte) & ~SRMMU_REF);
|
|
}
|
|
|
|
static inline pte_t pte_mkwrite(pte_t pte)
|
|
{
|
|
return __pte(pte_val(pte) | SRMMU_WRITE);
|
|
}
|
|
|
|
static inline pte_t pte_mkdirty(pte_t pte)
|
|
{
|
|
return __pte(pte_val(pte) | SRMMU_DIRTY);
|
|
}
|
|
|
|
static inline pte_t pte_mkyoung(pte_t pte)
|
|
{
|
|
return __pte(pte_val(pte) | SRMMU_REF);
|
|
}
|
|
|
|
#define pte_mkspecial(pte) (pte)
|
|
|
|
#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
|
|
|
|
static inline unsigned long pte_pfn(pte_t pte)
|
|
{
|
|
if (srmmu_device_memory(pte_val(pte))) {
|
|
/* Just return something that will cause
|
|
* pfn_valid() to return false. This makes
|
|
* copy_one_pte() to just directly copy to
|
|
* PTE over.
|
|
*/
|
|
return ~0UL;
|
|
}
|
|
return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4);
|
|
}
|
|
|
|
#define pte_page(pte) pfn_to_page(pte_pfn(pte))
|
|
|
|
/*
|
|
* Conversion functions: convert a page and protection to a page entry,
|
|
* and a page entry and page directory to the page they refer to.
|
|
*/
|
|
static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
|
|
{
|
|
return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot));
|
|
}
|
|
|
|
static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot)
|
|
{
|
|
return __pte(((page) >> 4) | pgprot_val(pgprot));
|
|
}
|
|
|
|
static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
|
|
{
|
|
return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot));
|
|
}
|
|
|
|
#define pgprot_noncached pgprot_noncached
|
|
static inline pgprot_t pgprot_noncached(pgprot_t prot)
|
|
{
|
|
pgprot_val(prot) &= ~pgprot_val(__pgprot(SRMMU_CACHE));
|
|
return prot;
|
|
}
|
|
|
|
static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
|
|
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
|
|
{
|
|
return __pte((pte_val(pte) & SRMMU_CHG_MASK) |
|
|
pgprot_val(newprot));
|
|
}
|
|
|
|
#define pgd_index(address) ((address) >> PGDIR_SHIFT)
|
|
|
|
/* to find an entry in a page-table-directory */
|
|
#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
|
|
|
|
/* to find an entry in a kernel page-table-directory */
|
|
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
|
|
|
|
/* Find an entry in the second-level page table.. */
|
|
static inline pmd_t *pmd_offset(pud_t * dir, unsigned long address)
|
|
{
|
|
return (pmd_t *) pud_page_vaddr(*dir) +
|
|
((address >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
|
|
}
|
|
|
|
/* Find an entry in the third-level page table.. */
|
|
pte_t *pte_offset_kernel(pmd_t * dir, unsigned long address);
|
|
|
|
/*
|
|
* This shortcut works on sun4m (and sun4d) because the nocache area is static.
|
|
*/
|
|
#define pte_offset_map(d, a) pte_offset_kernel(d,a)
|
|
#define pte_unmap(pte) do{}while(0)
|
|
|
|
struct seq_file;
|
|
void mmu_info(struct seq_file *m);
|
|
|
|
/* Fault handler stuff... */
|
|
#define FAULT_CODE_PROT 0x1
|
|
#define FAULT_CODE_WRITE 0x2
|
|
#define FAULT_CODE_USER 0x4
|
|
|
|
#define update_mmu_cache(vma, address, ptep) do { } while (0)
|
|
|
|
void srmmu_mapiorange(unsigned int bus, unsigned long xpa,
|
|
unsigned long xva, unsigned int len);
|
|
void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len);
|
|
|
|
/* Encode and de-code a swap entry */
|
|
static inline unsigned long __swp_type(swp_entry_t entry)
|
|
{
|
|
return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK;
|
|
}
|
|
|
|
static inline unsigned long __swp_offset(swp_entry_t entry)
|
|
{
|
|
return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK;
|
|
}
|
|
|
|
static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset)
|
|
{
|
|
return (swp_entry_t) {
|
|
(type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT
|
|
| (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT };
|
|
}
|
|
|
|
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
|
|
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
|
|
|
|
static inline unsigned long
|
|
__get_phys (unsigned long addr)
|
|
{
|
|
switch (sparc_cpu_model){
|
|
case sun4m:
|
|
case sun4d:
|
|
return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static inline int
|
|
__get_iospace (unsigned long addr)
|
|
{
|
|
switch (sparc_cpu_model){
|
|
case sun4m:
|
|
case sun4d:
|
|
return (srmmu_get_pte (addr) >> 28);
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
extern unsigned long *sparc_valid_addr_bitmap;
|
|
|
|
/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
|
|
#define kern_addr_valid(addr) \
|
|
(test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
|
|
|
|
/*
|
|
* For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
|
|
* its high 4 bits. These macros/functions put it there or get it from there.
|
|
*/
|
|
#define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
|
|
#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
|
|
#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
|
|
|
|
int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
|
|
unsigned long, pgprot_t);
|
|
|
|
static inline int io_remap_pfn_range(struct vm_area_struct *vma,
|
|
unsigned long from, unsigned long pfn,
|
|
unsigned long size, pgprot_t prot)
|
|
{
|
|
unsigned long long offset, space, phys_base;
|
|
|
|
offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
|
|
space = GET_IOSPACE(pfn);
|
|
phys_base = offset | (space << 32ULL);
|
|
|
|
return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
|
|
}
|
|
#define io_remap_pfn_range io_remap_pfn_range
|
|
|
|
#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
|
|
#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
|
|
({ \
|
|
int __changed = !pte_same(*(__ptep), __entry); \
|
|
if (__changed) { \
|
|
set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
|
|
flush_tlb_page(__vma, __address); \
|
|
} \
|
|
__changed; \
|
|
})
|
|
|
|
#include <asm-generic/pgtable.h>
|
|
|
|
#endif /* !(__ASSEMBLY__) */
|
|
|
|
#define VMALLOC_START _AC(0xfe600000,UL)
|
|
#define VMALLOC_END _AC(0xffc00000,UL)
|
|
|
|
/* We provide our own get_unmapped_area to cope with VA holes for userland */
|
|
#define HAVE_ARCH_UNMAPPED_AREA
|
|
|
|
#endif /* !(_SPARC_PGTABLE_H) */
|