186 lines
5.0 KiB
C
186 lines
5.0 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef _M68K_PGTABLE_H
|
||
|
|
#define _M68K_PGTABLE_H
|
||
|
|
|
||
|
|
|
||
|
|
#if defined(CONFIG_SUN3) || defined(CONFIG_COLDFIRE)
|
||
|
|
#include <asm-generic/pgtable-nopmd.h>
|
||
|
|
#else
|
||
|
|
#include <asm-generic/pgtable-nopud.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <asm/setup.h>
|
||
|
|
|
||
|
|
#ifndef __ASSEMBLY__
|
||
|
|
#include <asm/processor.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/threads.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This file contains the functions and defines necessary to modify and use
|
||
|
|
* the m68k page table tree.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <asm/virtconvert.h>
|
||
|
|
|
||
|
|
/* Certain architectures need to do special things when pte's
|
||
|
|
* within a page table are directly modified. Thus, the following
|
||
|
|
* hook is made available.
|
||
|
|
*/
|
||
|
|
#define set_pte(pteptr, pteval) \
|
||
|
|
do{ \
|
||
|
|
*(pteptr) = (pteval); \
|
||
|
|
} while(0)
|
||
|
|
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
|
||
|
|
|
||
|
|
|
||
|
|
/* PMD_SHIFT determines the size of the area a second-level page table can map */
|
||
|
|
#if CONFIG_PGTABLE_LEVELS == 3
|
||
|
|
#define PMD_SHIFT 18
|
||
|
|
#endif
|
||
|
|
#define PMD_SIZE (1UL << PMD_SHIFT)
|
||
|
|
#define PMD_MASK (~(PMD_SIZE-1))
|
||
|
|
|
||
|
|
/* PGDIR_SHIFT determines what a third-level page table entry can map */
|
||
|
|
#ifdef CONFIG_SUN3
|
||
|
|
#define PGDIR_SHIFT 17
|
||
|
|
#elif defined(CONFIG_COLDFIRE)
|
||
|
|
#define PGDIR_SHIFT 22
|
||
|
|
#else
|
||
|
|
#define PGDIR_SHIFT 25
|
||
|
|
#endif
|
||
|
|
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
|
||
|
|
#define PGDIR_MASK (~(PGDIR_SIZE-1))
|
||
|
|
|
||
|
|
/*
|
||
|
|
* entries per page directory level: the m68k is configured as three-level,
|
||
|
|
* so we do have PMD level physically.
|
||
|
|
*/
|
||
|
|
#ifdef CONFIG_SUN3
|
||
|
|
#define PTRS_PER_PTE 16
|
||
|
|
#define __PAGETABLE_PMD_FOLDED 1
|
||
|
|
#define PTRS_PER_PMD 1
|
||
|
|
#define PTRS_PER_PGD 2048
|
||
|
|
#elif defined(CONFIG_COLDFIRE)
|
||
|
|
#define PTRS_PER_PTE 512
|
||
|
|
#define __PAGETABLE_PMD_FOLDED 1
|
||
|
|
#define PTRS_PER_PMD 1
|
||
|
|
#define PTRS_PER_PGD 1024
|
||
|
|
#else
|
||
|
|
#define PTRS_PER_PTE 64
|
||
|
|
#define PTRS_PER_PMD 128
|
||
|
|
#define PTRS_PER_PGD 128
|
||
|
|
#endif
|
||
|
|
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
|
||
|
|
|
||
|
|
/* Virtual address region for use by kernel_map() */
|
||
|
|
#ifdef CONFIG_SUN3
|
||
|
|
#define KMAP_START 0x0dc00000
|
||
|
|
#define KMAP_END 0x0e000000
|
||
|
|
#elif defined(CONFIG_COLDFIRE)
|
||
|
|
#define KMAP_START 0xe0000000
|
||
|
|
#define KMAP_END 0xf0000000
|
||
|
|
#elif defined(CONFIG_VIRT)
|
||
|
|
#define KMAP_START 0xdf000000
|
||
|
|
#define KMAP_END 0xff000000
|
||
|
|
#else
|
||
|
|
#define KMAP_START 0xd0000000
|
||
|
|
#define KMAP_END 0xf0000000
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_SUN3
|
||
|
|
extern unsigned long m68k_vmalloc_end;
|
||
|
|
#define VMALLOC_START 0x0f800000
|
||
|
|
#define VMALLOC_END m68k_vmalloc_end
|
||
|
|
#elif defined(CONFIG_COLDFIRE)
|
||
|
|
#define VMALLOC_START 0xd0000000
|
||
|
|
#define VMALLOC_END 0xe0000000
|
||
|
|
#elif defined(CONFIG_VIRT)
|
||
|
|
#define VMALLOC_OFFSET PAGE_SIZE
|
||
|
|
#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
|
||
|
|
#define VMALLOC_END KMAP_START
|
||
|
|
#else
|
||
|
|
/* 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. ;)
|
||
|
|
*/
|
||
|
|
#define VMALLOC_OFFSET (8*1024*1024)
|
||
|
|
#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
|
||
|
|
#define VMALLOC_END KMAP_START
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* zero page used for uninitialized stuff */
|
||
|
|
extern void *empty_zero_page;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* ZERO_PAGE is a global shared page that is always zero: used
|
||
|
|
* for zero-mapped memory areas etc..
|
||
|
|
*/
|
||
|
|
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
|
||
|
|
|
||
|
|
/* number of bits that fit into a memory pointer */
|
||
|
|
#define BITS_PER_PTR (8*sizeof(unsigned long))
|
||
|
|
|
||
|
|
/* to align the pointer to a pointer address */
|
||
|
|
#define PTR_MASK (~(sizeof(void*)-1))
|
||
|
|
|
||
|
|
/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
|
||
|
|
/* 64-bit machines, beware! SRB. */
|
||
|
|
#define SIZEOF_PTR_LOG2 2
|
||
|
|
|
||
|
|
extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The m68k doesn't have any external MMU info: the kernel page
|
||
|
|
* tables contain all the necessary information. The Sun3 does, but
|
||
|
|
* they are updated on demand.
|
||
|
|
*/
|
||
|
|
static inline void update_mmu_cache(struct vm_area_struct *vma,
|
||
|
|
unsigned long address, pte_t *ptep)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* !__ASSEMBLY__ */
|
||
|
|
|
||
|
|
/* MMU-specific headers */
|
||
|
|
|
||
|
|
#ifdef CONFIG_SUN3
|
||
|
|
#include <asm/sun3_pgtable.h>
|
||
|
|
#elif defined(CONFIG_COLDFIRE)
|
||
|
|
#include <asm/mcf_pgtable.h>
|
||
|
|
#else
|
||
|
|
#include <asm/motorola_pgtable.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __ASSEMBLY__
|
||
|
|
/*
|
||
|
|
* Macro to mark a page protection value as "uncacheable".
|
||
|
|
*/
|
||
|
|
#ifdef CONFIG_COLDFIRE
|
||
|
|
# define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | CF_PAGE_NOCACHE))
|
||
|
|
#else
|
||
|
|
#ifdef SUN3_PAGE_NOCACHE
|
||
|
|
# define __SUN3_PAGE_NOCACHE SUN3_PAGE_NOCACHE
|
||
|
|
#else
|
||
|
|
# define __SUN3_PAGE_NOCACHE 0
|
||
|
|
#endif
|
||
|
|
#define pgprot_noncached(prot) \
|
||
|
|
(MMU_IS_SUN3 \
|
||
|
|
? (__pgprot(pgprot_val(prot) | __SUN3_PAGE_NOCACHE)) \
|
||
|
|
: ((MMU_IS_851 || MMU_IS_030) \
|
||
|
|
? (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE030)) \
|
||
|
|
: (MMU_IS_040 || MMU_IS_060) \
|
||
|
|
? (__pgprot((pgprot_val(prot) & _CACHEMASK040) | _PAGE_NOCACHE_S)) \
|
||
|
|
: (prot)))
|
||
|
|
|
||
|
|
pgprot_t pgprot_dmacoherent(pgprot_t prot);
|
||
|
|
#define pgprot_dmacoherent(prot) pgprot_dmacoherent(prot)
|
||
|
|
|
||
|
|
#endif /* CONFIG_COLDFIRE */
|
||
|
|
#endif /* !__ASSEMBLY__ */
|
||
|
|
|
||
|
|
#endif /* _M68K_PGTABLE_H */
|