298 lines
9.4 KiB
C
298 lines
9.4 KiB
C
/*
|
|
* linux/arch/unicore32/include/asm/pgtable.h
|
|
*
|
|
* Code specific to PKUnity SoC and UniCore ISA
|
|
*
|
|
* Copyright (C) 2001-2010 GUAN Xue-tao
|
|
*
|
|
* 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.
|
|
*/
|
|
#ifndef __UNICORE_PGTABLE_H__
|
|
#define __UNICORE_PGTABLE_H__
|
|
|
|
#define __ARCH_USE_5LEVEL_HACK
|
|
#include <asm-generic/pgtable-nopmd.h>
|
|
#include <asm/cpu-single.h>
|
|
|
|
#include <asm/memory.h>
|
|
#include <asm/pgtable-hwdef.h>
|
|
|
|
/*
|
|
* Just any arbitrary offset to the start of the vmalloc VM area: the
|
|
* current 8MB value just means that there will be a 8MB "hole" after the
|
|
* physical memory until the kernel virtual memory starts. That means that
|
|
* any out-of-bounds memory accesses will hopefully be caught.
|
|
* The vmalloc() routines leaves a hole of 4kB between each vmalloced
|
|
* area for the same reason. ;)
|
|
*
|
|
* Note that platforms may override VMALLOC_START, but they must provide
|
|
* VMALLOC_END. VMALLOC_END defines the (exclusive) limit of this space,
|
|
* which may not overlap IO space.
|
|
*/
|
|
#ifndef VMALLOC_START
|
|
#define VMALLOC_OFFSET SZ_8M
|
|
#define VMALLOC_START (((unsigned long)high_memory + VMALLOC_OFFSET) \
|
|
& ~(VMALLOC_OFFSET-1))
|
|
#define VMALLOC_END (0xff000000UL)
|
|
#endif
|
|
|
|
#define PTRS_PER_PTE 1024
|
|
#define PTRS_PER_PGD 1024
|
|
|
|
/*
|
|
* PGDIR_SHIFT determines what a third-level page table entry can map
|
|
*/
|
|
#define PGDIR_SHIFT 22
|
|
|
|
#ifndef __ASSEMBLY__
|
|
extern void __pte_error(const char *file, int line, unsigned long val);
|
|
extern void __pgd_error(const char *file, int line, unsigned long val);
|
|
|
|
#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte))
|
|
#define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
|
|
#define PGDIR_MASK (~(PGDIR_SIZE-1))
|
|
|
|
/*
|
|
* This is the lowest virtual address we can permit any user space
|
|
* mapping to be mapped at. This is particularly important for
|
|
* non-high vector CPUs.
|
|
*/
|
|
#define FIRST_USER_ADDRESS PAGE_SIZE
|
|
|
|
#define FIRST_USER_PGD_NR 1
|
|
#define USER_PTRS_PER_PGD ((TASK_SIZE/PGDIR_SIZE) - FIRST_USER_PGD_NR)
|
|
|
|
/*
|
|
* section address mask and size definitions.
|
|
*/
|
|
#define SECTION_SHIFT 22
|
|
#define SECTION_SIZE (1UL << SECTION_SHIFT)
|
|
#define SECTION_MASK (~(SECTION_SIZE-1))
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
/*
|
|
* The pgprot_* and protection_map entries will be fixed up in runtime
|
|
* to include the cachable bits based on memory policy, as well as any
|
|
* architecture dependent bits.
|
|
*/
|
|
#define _PTE_DEFAULT (PTE_PRESENT | PTE_YOUNG | PTE_CACHEABLE)
|
|
|
|
extern pgprot_t pgprot_user;
|
|
extern pgprot_t pgprot_kernel;
|
|
|
|
#define PAGE_NONE pgprot_user
|
|
#define PAGE_SHARED __pgprot(pgprot_val(pgprot_user | PTE_READ \
|
|
| PTE_WRITE))
|
|
#define PAGE_SHARED_EXEC __pgprot(pgprot_val(pgprot_user | PTE_READ \
|
|
| PTE_WRITE \
|
|
| PTE_EXEC))
|
|
#define PAGE_COPY __pgprot(pgprot_val(pgprot_user | PTE_READ)
|
|
#define PAGE_COPY_EXEC __pgprot(pgprot_val(pgprot_user | PTE_READ \
|
|
| PTE_EXEC))
|
|
#define PAGE_READONLY __pgprot(pgprot_val(pgprot_user | PTE_READ))
|
|
#define PAGE_READONLY_EXEC __pgprot(pgprot_val(pgprot_user | PTE_READ \
|
|
| PTE_EXEC))
|
|
#define PAGE_KERNEL pgprot_kernel
|
|
#define PAGE_KERNEL_EXEC __pgprot(pgprot_val(pgprot_kernel | PTE_EXEC))
|
|
|
|
#define __PAGE_NONE __pgprot(_PTE_DEFAULT)
|
|
#define __PAGE_SHARED __pgprot(_PTE_DEFAULT | PTE_READ \
|
|
| PTE_WRITE)
|
|
#define __PAGE_SHARED_EXEC __pgprot(_PTE_DEFAULT | PTE_READ \
|
|
| PTE_WRITE \
|
|
| PTE_EXEC)
|
|
#define __PAGE_COPY __pgprot(_PTE_DEFAULT | PTE_READ)
|
|
#define __PAGE_COPY_EXEC __pgprot(_PTE_DEFAULT | PTE_READ \
|
|
| PTE_EXEC)
|
|
#define __PAGE_READONLY __pgprot(_PTE_DEFAULT | PTE_READ)
|
|
#define __PAGE_READONLY_EXEC __pgprot(_PTE_DEFAULT | PTE_READ \
|
|
| PTE_EXEC)
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
/*
|
|
* The table below defines the page protection levels that we insert into our
|
|
* Linux page table version. These get translated into the best that the
|
|
* architecture can perform. Note that on UniCore hardware:
|
|
* 1) We cannot do execute protection
|
|
* 2) If we could do execute protection, then read is implied
|
|
* 3) write implies read permissions
|
|
*/
|
|
#define __P000 __PAGE_NONE
|
|
#define __P001 __PAGE_READONLY
|
|
#define __P010 __PAGE_COPY
|
|
#define __P011 __PAGE_COPY
|
|
#define __P100 __PAGE_READONLY_EXEC
|
|
#define __P101 __PAGE_READONLY_EXEC
|
|
#define __P110 __PAGE_COPY_EXEC
|
|
#define __P111 __PAGE_COPY_EXEC
|
|
|
|
#define __S000 __PAGE_NONE
|
|
#define __S001 __PAGE_READONLY
|
|
#define __S010 __PAGE_SHARED
|
|
#define __S011 __PAGE_SHARED
|
|
#define __S100 __PAGE_READONLY_EXEC
|
|
#define __S101 __PAGE_READONLY_EXEC
|
|
#define __S110 __PAGE_SHARED_EXEC
|
|
#define __S111 __PAGE_SHARED_EXEC
|
|
|
|
#ifndef __ASSEMBLY__
|
|
/*
|
|
* ZERO_PAGE is a global shared page that is always zero: used
|
|
* for zero-mapped memory areas etc..
|
|
*/
|
|
extern struct page *empty_zero_page;
|
|
#define ZERO_PAGE(vaddr) (empty_zero_page)
|
|
|
|
#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
|
|
#define pfn_pte(pfn, prot) (__pte(((pfn) << PAGE_SHIFT) \
|
|
| pgprot_val(prot)))
|
|
|
|
#define pte_none(pte) (!pte_val(pte))
|
|
#define pte_clear(mm, addr, ptep) set_pte(ptep, __pte(0))
|
|
#define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
|
|
#define pte_offset_kernel(dir, addr) (pmd_page_vaddr(*(dir)) \
|
|
+ __pte_index(addr))
|
|
|
|
#define pte_offset_map(dir, addr) (pmd_page_vaddr(*(dir)) \
|
|
+ __pte_index(addr))
|
|
#define pte_unmap(pte) do { } while (0)
|
|
|
|
#define set_pte(ptep, pte) cpu_set_pte(ptep, pte)
|
|
|
|
#define set_pte_at(mm, addr, ptep, pteval) \
|
|
do { \
|
|
set_pte(ptep, pteval); \
|
|
} while (0)
|
|
|
|
/*
|
|
* The following only work if pte_present() is true.
|
|
* Undefined behaviour if not..
|
|
*/
|
|
#define pte_present(pte) (pte_val(pte) & PTE_PRESENT)
|
|
#define pte_write(pte) (pte_val(pte) & PTE_WRITE)
|
|
#define pte_dirty(pte) (pte_val(pte) & PTE_DIRTY)
|
|
#define pte_young(pte) (pte_val(pte) & PTE_YOUNG)
|
|
#define pte_exec(pte) (pte_val(pte) & PTE_EXEC)
|
|
#define pte_special(pte) (0)
|
|
|
|
#define PTE_BIT_FUNC(fn, op) \
|
|
static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
|
|
|
|
PTE_BIT_FUNC(wrprotect, &= ~PTE_WRITE);
|
|
PTE_BIT_FUNC(mkwrite, |= PTE_WRITE);
|
|
PTE_BIT_FUNC(mkclean, &= ~PTE_DIRTY);
|
|
PTE_BIT_FUNC(mkdirty, |= PTE_DIRTY);
|
|
PTE_BIT_FUNC(mkold, &= ~PTE_YOUNG);
|
|
PTE_BIT_FUNC(mkyoung, |= PTE_YOUNG);
|
|
|
|
static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
|
|
|
|
/*
|
|
* Mark the prot value as uncacheable.
|
|
*/
|
|
#define pgprot_noncached(prot) \
|
|
__pgprot(pgprot_val(prot) & ~PTE_CACHEABLE)
|
|
#define pgprot_writecombine(prot) \
|
|
__pgprot(pgprot_val(prot) & ~PTE_CACHEABLE)
|
|
#define pgprot_dmacoherent(prot) \
|
|
__pgprot(pgprot_val(prot) & ~PTE_CACHEABLE)
|
|
|
|
#define pmd_none(pmd) (!pmd_val(pmd))
|
|
#define pmd_present(pmd) (pmd_val(pmd) & PMD_PRESENT)
|
|
#define pmd_bad(pmd) (((pmd_val(pmd) & \
|
|
(PMD_PRESENT | PMD_TYPE_MASK)) \
|
|
!= (PMD_PRESENT | PMD_TYPE_TABLE)))
|
|
|
|
#define set_pmd(pmdpd, pmdval) \
|
|
do { \
|
|
*(pmdpd) = pmdval; \
|
|
} while (0)
|
|
|
|
#define pmd_clear(pmdp) \
|
|
do { \
|
|
set_pmd(pmdp, __pmd(0));\
|
|
clean_pmd_entry(pmdp); \
|
|
} while (0)
|
|
|
|
#define pmd_page_vaddr(pmd) ((pte_t *)__va(pmd_val(pmd) & PAGE_MASK))
|
|
#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd)))
|
|
|
|
/*
|
|
* 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, prot) pfn_pte(page_to_pfn(page), prot)
|
|
|
|
/* to find an entry in a page-table-directory */
|
|
#define pgd_index(addr) ((addr) >> PGDIR_SHIFT)
|
|
|
|
#define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr))
|
|
|
|
/* to find an entry in a kernel page-table-directory */
|
|
#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
|
|
|
|
/* Find an entry in the third-level page table.. */
|
|
#define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
|
|
|
|
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
|
|
{
|
|
const unsigned long mask = PTE_EXEC | PTE_WRITE | PTE_READ;
|
|
pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
|
|
return pte;
|
|
}
|
|
|
|
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
|
|
|
|
/*
|
|
* Encode and decode a swap entry. Swap entries are stored in the Linux
|
|
* page tables as follows:
|
|
*
|
|
* 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
|
|
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
|
|
* <--------------- offset --------------> <--- type --> 0 0 0 0 0
|
|
*
|
|
* This gives us up to 127 swap files and 32GB per swap file. Note that
|
|
* the offset field is always non-zero.
|
|
*/
|
|
#define __SWP_TYPE_SHIFT 5
|
|
#define __SWP_TYPE_BITS 7
|
|
#define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1)
|
|
#define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
|
|
|
|
#define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) \
|
|
& __SWP_TYPE_MASK)
|
|
#define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT)
|
|
#define __swp_entry(type, offset) ((swp_entry_t) { \
|
|
((type) << __SWP_TYPE_SHIFT) | \
|
|
((offset) << __SWP_OFFSET_SHIFT) })
|
|
|
|
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
|
|
#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
|
|
|
|
/*
|
|
* It is an error for the kernel to have more swap files than we can
|
|
* encode in the PTEs. This ensures that we know when MAX_SWAPFILES
|
|
* is increased beyond what we presently support.
|
|
*/
|
|
#define MAX_SWAPFILES_CHECK() \
|
|
BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
|
|
|
|
/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
|
|
/* FIXME: this is not correct */
|
|
#define kern_addr_valid(addr) (1)
|
|
|
|
#include <asm-generic/pgtable.h>
|
|
|
|
#define pgtable_cache_init() do { } while (0)
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif /* __UNICORE_PGTABLE_H__ */
|