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sh: Preliminary support for SH-X2 MMU.

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This adds some preliminary support for the SH-X2 MMU, used by
newer SH-4A parts (particularly SH7785).

This MMU implements a 'compat' mode with SH-X MMUs and an
'extended' mode for SH-X2 extended features. Extended features
include additional page sizes (8kB, 4MB, 64MB), as well as the
addition of page execute permissions.

The extended mode attributes are placed in a second data array,
which requires us to switch to 64-bit PTEs when in X2 mode.

With the addition of the exec perms, we also overhaul the mmap
prots somewhat, now that it's possible to handle them more
intelligently.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2006-11-20 14:30:26 +09:00
parent b552c7e8bc
commit 21440cf04a
8 changed files with 376 additions and 161 deletions
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49
arch/sh/mm/Kconfig
View File

@ -235,13 +235,22 @@ config MEMORY_SIZE
config 32BIT config 32BIT
bool "Support 32-bit physical addressing through PMB" bool "Support 32-bit physical addressing through PMB"
depends on CPU_SH4A && MMU depends on CPU_SH4A && MMU && (!X2TLB || BROKEN)
default y default y
help help
If you say Y here, physical addressing will be extended to If you say Y here, physical addressing will be extended to
32-bits through the SH-4A PMB. If this is not set, legacy 32-bits through the SH-4A PMB. If this is not set, legacy
29-bit physical addressing will be used. 29-bit physical addressing will be used.
config X2TLB
bool "Enable extended TLB mode"
depends on CPU_SUBTYPE_SH7785 && MMU && EXPERIMENTAL
help
Selecting this option will enable the extended mode of the SH-X2
TLB. For legacy SH-X behaviour and interoperability, say N. For
all of the fun new features and a willingless to submit bug reports,
say Y.
config VSYSCALL config VSYSCALL
bool "Support vsyscall page" bool "Support vsyscall page"
depends on MMU depends on MMU
@ -255,17 +264,53 @@ config VSYSCALL
For systems with an MMU that can afford to give up a page, For systems with an MMU that can afford to give up a page,
(the default value) say Y. (the default value) say Y.
choice
prompt "Kernel page size"
default PAGE_SIZE_4KB
config PAGE_SIZE_4KB
bool "4kB"
help
This is the default page size used by all SuperH CPUs.
config PAGE_SIZE_8KB
bool "8kB"
depends on EXPERIMENTAL && X2TLB
help
This enables 8kB pages as supported by SH-X2 and later MMUs.
config PAGE_SIZE_64KB
bool "64kB"
depends on EXPERIMENTAL && CPU_SH4
help
This enables support for 64kB pages, possible on all SH-4
CPUs and later. Highly experimental, not recommended.
endchoice
choice choice
prompt "HugeTLB page size" prompt "HugeTLB page size"
depends on HUGETLB_PAGE && CPU_SH4 && MMU depends on HUGETLB_PAGE && CPU_SH4 && MMU
default HUGETLB_PAGE_SIZE_64K default HUGETLB_PAGE_SIZE_64K
config HUGETLB_PAGE_SIZE_64K config HUGETLB_PAGE_SIZE_64K
bool "64K" bool "64kB"
config HUGETLB_PAGE_SIZE_256K
bool "256kB"
depends on X2TLB
config HUGETLB_PAGE_SIZE_1MB config HUGETLB_PAGE_SIZE_1MB
bool "1MB" bool "1MB"
config HUGETLB_PAGE_SIZE_4MB
bool "4MB"
depends on X2TLB
config HUGETLB_PAGE_SIZE_64MB
bool "64MB"
depends on X2TLB
endchoice endchoice
source "mm/Kconfig" source "mm/Kconfig"

4
arch/sh/mm/init.c
View File

@ -93,7 +93,7 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
pud = pud_offset(pgd, addr); pud = pud_offset(pgd, addr);
if (pud_none(*pud)) { if (pud_none(*pud)) {
pmd = (pmd_t *)get_zeroed_page(GFP_ATOMIC); pmd = (pmd_t *)get_zeroed_page(GFP_ATOMIC);
set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); set_pud(pud, __pud(__pa(pmd) | _PAGE_TABLE));
if (pmd != pmd_offset(pud, 0)) { if (pmd != pmd_offset(pud, 0)) {
pud_ERROR(*pud); pud_ERROR(*pud);
return; return;
@ -103,7 +103,7 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
pmd = pmd_offset(pud, addr); pmd = pmd_offset(pud, addr);
if (pmd_none(*pmd)) { if (pmd_none(*pmd)) {
pte = (pte_t *)get_zeroed_page(GFP_ATOMIC); pte = (pte_t *)get_zeroed_page(GFP_ATOMIC);
set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
if (pte != pte_offset_kernel(pmd, 0)) { if (pte != pte_offset_kernel(pmd, 0)) {
pmd_ERROR(*pmd); pmd_ERROR(*pmd);
return; return;

4
arch/sh/mm/ioremap.c
View File

@ -28,9 +28,7 @@ static inline void remap_area_pte(pte_t * pte, unsigned long address,
{ {
unsigned long end; unsigned long end;
unsigned long pfn; unsigned long pfn;
pgprot_t pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | pgprot_t pgprot = __pgprot(pgprot_val(PAGE_KERNEL_NOCACHE) | flags);
_PAGE_DIRTY | _PAGE_ACCESSED |
_PAGE_HW_SHARED | _PAGE_FLAGS_HARD | flags);
address &= ~PMD_MASK; address &= ~PMD_MASK;
end = address + size; end = address + size;

12
arch/sh/mm/pg-sh4.c
View File

@ -37,10 +37,6 @@ void clear_user_page(void *to, unsigned long address, struct page *page)
if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0)
clear_page(to); clear_page(to);
else { else {
pgprot_t pgprot = __pgprot(_PAGE_PRESENT |
_PAGE_RW | _PAGE_CACHABLE |
_PAGE_DIRTY | _PAGE_ACCESSED |
_PAGE_HW_SHARED | _PAGE_FLAGS_HARD);
unsigned long phys_addr = PHYSADDR(to); unsigned long phys_addr = PHYSADDR(to);
unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS); unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS);
pgd_t *pgd = pgd_offset_k(p3_addr); pgd_t *pgd = pgd_offset_k(p3_addr);
@ -50,7 +46,7 @@ void clear_user_page(void *to, unsigned long address, struct page *page)
pte_t entry; pte_t entry;
unsigned long flags; unsigned long flags;
entry = pfn_pte(phys_addr >> PAGE_SHIFT, pgprot); entry = pfn_pte(phys_addr >> PAGE_SHIFT, PAGE_KERNEL);
down(&p3map_sem[(address & CACHE_ALIAS)>>12]); down(&p3map_sem[(address & CACHE_ALIAS)>>12]);
set_pte(pte, entry); set_pte(pte, entry);
local_irq_save(flags); local_irq_save(flags);
@ -77,10 +73,6 @@ void copy_user_page(void *to, void *from, unsigned long address,
if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0)
copy_page(to, from); copy_page(to, from);
else { else {
pgprot_t pgprot = __pgprot(_PAGE_PRESENT |
_PAGE_RW | _PAGE_CACHABLE |
_PAGE_DIRTY | _PAGE_ACCESSED |
_PAGE_HW_SHARED | _PAGE_FLAGS_HARD);
unsigned long phys_addr = PHYSADDR(to); unsigned long phys_addr = PHYSADDR(to);
unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS); unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS);
pgd_t *pgd = pgd_offset_k(p3_addr); pgd_t *pgd = pgd_offset_k(p3_addr);
@ -90,7 +82,7 @@ void copy_user_page(void *to, void *from, unsigned long address,
pte_t entry; pte_t entry;
unsigned long flags; unsigned long flags;
entry = pfn_pte(phys_addr >> PAGE_SHIFT, pgprot); entry = pfn_pte(phys_addr >> PAGE_SHIFT, PAGE_KERNEL);
down(&p3map_sem[(address & CACHE_ALIAS)>>12]); down(&p3map_sem[(address & CACHE_ALIAS)>>12]);
set_pte(pte, entry); set_pte(pte, entry);
local_irq_save(flags); local_irq_save(flags);

2
include/asm-sh/elf.h
View File

@ -74,7 +74,7 @@ typedef struct user_fpu_struct elf_fpregset_t;
#define ELF_ARCH EM_SH #define ELF_ARCH EM_SH
#define USE_ELF_CORE_DUMP #define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE 4096 #define ELF_EXEC_PAGESIZE PAGE_SIZE
/* This is the location that an ET_DYN program is loaded if exec'ed. Typical /* This is the location that an ET_DYN program is loaded if exec'ed. Typical
use of this is to invoke "./ld.so someprog" to test out a new version of use of this is to invoke "./ld.so someprog" to test out a new version of

35
include/asm-sh/page.h
View File

@ -13,9 +13,16 @@
[ P4 control ] 0xE0000000 [ P4 control ] 0xE0000000
*/ */
/* PAGE_SHIFT determines the page size */ /* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT 12 #if defined(CONFIG_PAGE_SIZE_4KB)
# define PAGE_SHIFT 12
#elif defined(CONFIG_PAGE_SIZE_8KB)
# define PAGE_SHIFT 13
#elif defined(CONFIG_PAGE_SIZE_64KB)
# define PAGE_SHIFT 16
#else
# error "Bogus kernel page size?"
#endif
#ifdef __ASSEMBLY__ #ifdef __ASSEMBLY__
#define PAGE_SIZE (1 << PAGE_SHIFT) #define PAGE_SIZE (1 << PAGE_SHIFT)
@ -28,8 +35,14 @@
#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
#define HPAGE_SHIFT 16 #define HPAGE_SHIFT 16
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
#define HPAGE_SHIFT 18
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
#define HPAGE_SHIFT 20 #define HPAGE_SHIFT 20
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
#define HPAGE_SHIFT 22
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
#define HPAGE_SHIFT 26
#endif #endif
#ifdef CONFIG_HUGETLB_PAGE #ifdef CONFIG_HUGETLB_PAGE
@ -69,15 +82,25 @@ extern void __copy_user_page(void *to, void *from, void *orig_to);
/* /*
* These are used to make use of C type-checking.. * These are used to make use of C type-checking..
*/ */
typedef struct { unsigned long pte; } pte_t; #ifdef CONFIG_X2TLB
typedef struct { unsigned long pgd; } pgd_t; typedef struct { unsigned long pte_low, pte_high; } pte_t;
typedef struct { unsigned long long pgprot; } pgprot_t;
#define pte_val(x) \
((x).pte_low | ((unsigned long long)(x).pte_high << 32))
#define __pte(x) \
({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
#else
typedef struct { unsigned long pte_low; } pte_t;
typedef struct { unsigned long pgprot; } pgprot_t; typedef struct { unsigned long pgprot; } pgprot_t;
#define pte_val(x) ((x).pte_low)
#define __pte(x) ((pte_t) { (x) } )
#endif
typedef struct { unsigned long pgd; } pgd_t;
#define pte_val(x) ((x).pte)
#define pgd_val(x) ((x).pgd) #define pgd_val(x) ((x).pgd)
#define pgprot_val(x) ((x).pgprot) #define pgprot_val(x) ((x).pgprot)
#define __pte(x) ((pte_t) { (x) } )
#define __pgd(x) ((pgd_t) { (x) } ) #define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } ) #define __pgprot(x) ((pgprot_t) { (x) } )

70
include/asm-sh/pgtable-2level.h
View File

@ -1,70 +0,0 @@
#ifndef __ASM_SH_PGTABLE_2LEVEL_H
#define __ASM_SH_PGTABLE_2LEVEL_H
/*
* traditional two-level paging structure:
*/
#define PGDIR_SHIFT 22
#define PTRS_PER_PGD 1024
/*
* this is two-level, so we don't really have any
* PMD directory physically.
*/
#define PMD_SHIFT 22
#define PTRS_PER_PMD 1
#define PTRS_PER_PTE 1024
#ifndef __ASSEMBLY__
#define pte_ERROR(e) \
printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
#define pmd_ERROR(e) \
printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
#define pgd_ERROR(e) \
printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
/*
* The "pgd_xxx()" functions here are trivial for a folded two-level
* setup: the pgd is never bad, and a pmd always exists (as it's folded
* into the pgd entry)
*/
static inline int pgd_none(pgd_t pgd) { return 0; }
static inline int pgd_bad(pgd_t pgd) { return 0; }
static inline int pgd_present(pgd_t pgd) { return 1; }
static inline void pgd_clear (pgd_t * pgdp) { }
/*
* Certain architectures need to do special things when PTEs
* within a page table are directly modified. Thus, the following
* hook is made available.
*/
#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
/*
* (pmds are folded into pgds so this doesn't get actually called,
* but the define is needed for a generic inline function.)
*/
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
#define pgd_page_vaddr(pgd) \
((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
#define pgd_page(pgd) \
(phys_to_page(pgd_val(pgd)))
static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
{
return (pmd_t *) dir;
}
#define pte_pfn(x) ((unsigned long)(((x).pte >> PAGE_SHIFT)))
#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_SH_PGTABLE_2LEVEL_H */

359
include/asm-sh/pgtable.h
View File

@ -15,15 +15,10 @@
#include <asm-generic/pgtable-nopmd.h> #include <asm-generic/pgtable-nopmd.h>
#include <asm/page.h> #include <asm/page.h>
#define PTRS_PER_PGD 1024
#ifndef __ASSEMBLY__ #ifndef __ASSEMBLY__
#include <asm/addrspace.h> #include <asm/addrspace.h>
#include <asm/fixmap.h> #include <asm/fixmap.h>
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
extern void paging_init(void);
/* /*
* ZERO_PAGE is a global shared page that is always zero: used * ZERO_PAGE is a global shared page that is always zero: used
* for zero-mapped memory areas etc.. * for zero-mapped memory areas etc..
@ -33,15 +28,28 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
#endif /* !__ASSEMBLY__ */ #endif /* !__ASSEMBLY__ */
/* traditional two-level paging structure */ /*
#define PGDIR_SHIFT 22 * traditional two-level paging structure
#define PTRS_PER_PMD 1 */
#define PTRS_PER_PTE 1024 /* PTE bits */
#define PMD_SIZE (1UL << PMD_SHIFT) #ifdef CONFIG_X2TLB
#define PMD_MASK (~(PMD_SIZE-1)) # define PTE_MAGNITUDE 3 /* 64-bit PTEs on extended mode SH-X2 TLB */
#else
# define PTE_MAGNITUDE 2 /* 32-bit PTEs */
#endif
#define PTE_SHIFT PAGE_SHIFT
#define PTE_BITS (PTE_SHIFT - PTE_MAGNITUDE)
/* PGD bits */
#define PGDIR_SHIFT (PTE_SHIFT + PTE_BITS)
#define PGDIR_BITS (32 - PGDIR_SHIFT)
#define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1)) #define PGDIR_MASK (~(PGDIR_SIZE-1))
/* Entries per level */
#define PTRS_PER_PTE (1UL << PTE_BITS)
#define PTRS_PER_PGD (1UL << PGDIR_BITS)
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE) #define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0 #define FIRST_USER_ADDRESS 0
@ -57,7 +65,8 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
/* /*
* Linux PTEL encoding. * Linux PTEL encoding.
* *
* Hardware and software bit definitions for the PTEL value: * Hardware and software bit definitions for the PTEL value (see below for
* notes on SH-X2 MMUs and 64-bit PTEs):
* *
* - Bits 0 and 7 are reserved on SH-3 (_PAGE_WT and _PAGE_SZ1 on SH-4). * - Bits 0 and 7 are reserved on SH-3 (_PAGE_WT and _PAGE_SZ1 on SH-4).
* *
@ -76,20 +85,57 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
* *
* - Bits 31, 30, and 29 remain unused by everyone and can be used for future * - Bits 31, 30, and 29 remain unused by everyone and can be used for future
* software flags, although care must be taken to update _PAGE_CLEAR_FLAGS. * software flags, although care must be taken to update _PAGE_CLEAR_FLAGS.
*
* XXX: Leave the _PAGE_FILE and _PAGE_WT overhaul for a rainy day.
*
* SH-X2 MMUs and extended PTEs
*
* SH-X2 supports an extended mode TLB with split data arrays due to the
* number of bits needed for PR and SZ (now EPR and ESZ) encodings. The PR and
* SZ bit placeholders still exist in data array 1, but are implemented as
* reserved bits, with the real logic existing in data array 2.
*
* The downside to this is that we can no longer fit everything in to a 32-bit
* PTE encoding, so a 64-bit pte_t is necessary for these parts. On the plus
* side, this gives us quite a few spare bits to play with for future usage.
*/ */
/* Legacy and compat mode bits */
#define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */ #define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */
#define _PAGE_HW_SHARED 0x002 /* SH-bit : shared among processes */ #define _PAGE_HW_SHARED 0x002 /* SH-bit : shared among processes */
#define _PAGE_DIRTY 0x004 /* D-bit : page changed */ #define _PAGE_DIRTY 0x004 /* D-bit : page changed */
#define _PAGE_CACHABLE 0x008 /* C-bit : cachable */ #define _PAGE_CACHABLE 0x008 /* C-bit : cachable */
#define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */ #ifndef CONFIG_X2TLB
#define _PAGE_RW 0x020 /* PR0-bit : write access allowed */ # define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */
#define _PAGE_USER 0x040 /* PR1-bit : user space access allowed */ # define _PAGE_RW 0x020 /* PR0-bit : write access allowed */
#define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */ # define _PAGE_USER 0x040 /* PR1-bit : user space access allowed*/
# define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */
#endif
#define _PAGE_PRESENT 0x100 /* V-bit : page is valid */ #define _PAGE_PRESENT 0x100 /* V-bit : page is valid */
#define _PAGE_PROTNONE 0x200 /* software: if not present */ #define _PAGE_PROTNONE 0x200 /* software: if not present */
#define _PAGE_ACCESSED 0x400 /* software: page referenced */ #define _PAGE_ACCESSED 0x400 /* software: page referenced */
#define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */ #define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */
/* Extended mode bits */
#define _PAGE_EXT_ESZ0 0x0010 /* ESZ0-bit: Size of page */
#define _PAGE_EXT_ESZ1 0x0020 /* ESZ1-bit: Size of page */
#define _PAGE_EXT_ESZ2 0x0040 /* ESZ2-bit: Size of page */
#define _PAGE_EXT_ESZ3 0x0080 /* ESZ3-bit: Size of page */
#define _PAGE_EXT_USER_EXEC 0x0100 /* EPR0-bit: User space executable */
#define _PAGE_EXT_USER_WRITE 0x0200 /* EPR1-bit: User space writable */
#define _PAGE_EXT_USER_READ 0x0400 /* EPR2-bit: User space readable */
#define _PAGE_EXT_KERN_EXEC 0x0800 /* EPR3-bit: Kernel space executable */
#define _PAGE_EXT_KERN_WRITE 0x1000 /* EPR4-bit: Kernel space writable */
#define _PAGE_EXT_KERN_READ 0x2000 /* EPR5-bit: Kernel space readable */
/* Wrapper for extended mode pgprot twiddling */
#ifdef CONFIG_X2TLB
# define _PAGE_EXT(x) ((unsigned long long)(x) << 32)
#else
# define _PAGE_EXT(x) (0)
#endif
/* software: moves to PTEA.TC (Timing Control) */ /* software: moves to PTEA.TC (Timing Control) */
#define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */ #define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */
#define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */ #define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */
@ -114,37 +160,165 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
#define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS)) #define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS))
/* Hardware flags: SZ0=1 (4k-byte) */ /* Hardware flags, page size encoding */
#define _PAGE_FLAGS_HARD _PAGE_SZ0 #if defined(CONFIG_X2TLB)
# if defined(CONFIG_PAGE_SIZE_4KB)
#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ0)
#define _PAGE_SZHUGE (_PAGE_SZ1) # elif defined(CONFIG_PAGE_SIZE_8KB)
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ1)
#define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1) # elif defined(CONFIG_PAGE_SIZE_64KB)
# define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ2)
# endif
#else
# if defined(CONFIG_PAGE_SIZE_4KB)
# define _PAGE_FLAGS_HARD _PAGE_SZ0
# elif defined(CONFIG_PAGE_SIZE_64KB)
# define _PAGE_FLAGS_HARD _PAGE_SZ1
# endif
#endif #endif
#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY) #if defined(CONFIG_X2TLB)
#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY) # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY) # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2)
# elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
# define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2)
# elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
# define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2)
# elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
# define _PAGE_SZHUGE (_PAGE_EXT_ESZ3)
# elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
# define _PAGE_SZHUGE (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3)
# endif
#else
# if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
# define _PAGE_SZHUGE (_PAGE_SZ1)
# elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
# define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1)
# endif
#endif
#define _PAGE_CHG_MASK \
(PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY)
#ifndef __ASSEMBLY__ #ifndef __ASSEMBLY__
#ifdef CONFIG_MMU #if defined(CONFIG_X2TLB) /* SH-X2 TLB */
#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_FLAGS_HARD) #define _PAGE_TABLE \
#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_FLAGS_HARD) (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY | \
#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) _PAGE_EXT(_PAGE_EXT_USER_READ | _PAGE_EXT_USER_WRITE))
#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) #define _KERNPG_TABLE \
(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY | \
_PAGE_EXT(_PAGE_EXT_KERN_READ | _PAGE_EXT_KERN_WRITE))
#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
_PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
_PAGE_EXT(_PAGE_EXT_USER_READ | \
_PAGE_EXT_USER_WRITE))
#define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
_PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
_PAGE_EXT(_PAGE_EXT_USER_EXEC | \
_PAGE_EXT_USER_READ))
#define PAGE_COPY PAGE_EXECREAD
#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
_PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
_PAGE_EXT(_PAGE_EXT_USER_READ))
#define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
_PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
_PAGE_EXT(_PAGE_EXT_USER_WRITE))
#define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
_PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
_PAGE_EXT(_PAGE_EXT_USER_WRITE | \
_PAGE_EXT_USER_READ | \
_PAGE_EXT_USER_EXEC))
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
_PAGE_DIRTY | _PAGE_ACCESSED | \
_PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
_PAGE_EXT(_PAGE_EXT_KERN_READ | \
_PAGE_EXT_KERN_WRITE | \
_PAGE_EXT_KERN_EXEC))
#define PAGE_KERNEL_NOCACHE \ #define PAGE_KERNEL_NOCACHE \
__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \
#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) _PAGE_ACCESSED | _PAGE_HW_SHARED | \
_PAGE_FLAGS_HARD | \
_PAGE_EXT(_PAGE_EXT_KERN_READ | \
_PAGE_EXT_KERN_WRITE | \
_PAGE_EXT_KERN_EXEC))
#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
_PAGE_DIRTY | _PAGE_ACCESSED | \
_PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
_PAGE_EXT(_PAGE_EXT_KERN_READ | \
_PAGE_EXT_KERN_EXEC))
#define PAGE_KERNEL_PCC(slot, type) \ #define PAGE_KERNEL_PCC(slot, type) \
__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | (type)) __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \
_PAGE_ACCESSED | _PAGE_FLAGS_HARD | \
_PAGE_EXT(_PAGE_EXT_KERN_READ | \
_PAGE_EXT_KERN_WRITE | \
_PAGE_EXT_KERN_EXEC) \
(slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \
(type))
#elif defined(CONFIG_MMU) /* SH-X TLB */
#define _PAGE_TABLE \
(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
#define _KERNPG_TABLE \
(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
_PAGE_CACHABLE | _PAGE_ACCESSED | \
_PAGE_FLAGS_HARD)
#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
#define PAGE_EXECREAD PAGE_READONLY
#define PAGE_RWX PAGE_SHARED
#define PAGE_WRITEONLY PAGE_SHARED
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \
_PAGE_DIRTY | _PAGE_ACCESSED | \
_PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
#define PAGE_KERNEL_NOCACHE \
__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
_PAGE_ACCESSED | _PAGE_HW_SHARED | \
_PAGE_FLAGS_HARD)
#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
_PAGE_DIRTY | _PAGE_ACCESSED | \
_PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
#define PAGE_KERNEL_PCC(slot, type) \
__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
_PAGE_ACCESSED | _PAGE_FLAGS_HARD | \
(slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \
(type))
#else /* no mmu */ #else /* no mmu */
#define PAGE_NONE __pgprot(0) #define PAGE_NONE __pgprot(0)
#define PAGE_SHARED __pgprot(0) #define PAGE_SHARED __pgprot(0)
#define PAGE_COPY __pgprot(0) #define PAGE_COPY __pgprot(0)
#define PAGE_EXECREAD __pgprot(0)
#define PAGE_RWX __pgprot(0)
#define PAGE_READONLY __pgprot(0) #define PAGE_READONLY __pgprot(0)
#define PAGE_WRITEONLY __pgprot(0)
#define PAGE_KERNEL __pgprot(0) #define PAGE_KERNEL __pgprot(0)
#define PAGE_KERNEL_NOCACHE __pgprot(0) #define PAGE_KERNEL_NOCACHE __pgprot(0)
#define PAGE_KERNEL_RO __pgprot(0) #define PAGE_KERNEL_RO __pgprot(0)
@ -154,27 +328,32 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
#endif /* __ASSEMBLY__ */ #endif /* __ASSEMBLY__ */
/* /*
* As i386 and MIPS, SuperH can't do page protection for execute, and * SH-X and lower (legacy) SuperH parts (SH-3, SH-4, some SH-4A) can't do page
* considers that the same as a read. Also, write permissions imply * protection for execute, and considers it the same as a read. Also, write
* read permissions. This is the closest we can get.. * permission implies read permission. This is the closest we can get..
*
* SH-X2 (SH7785) and later parts take this to the opposite end of the extreme,
* not only supporting separate execute, read, and write bits, but having
* completely separate permission bits for user and kernel space.
*/ */
/*xwr*/
#define __P000 PAGE_NONE #define __P000 PAGE_NONE
#define __P001 PAGE_READONLY #define __P001 PAGE_READONLY
#define __P010 PAGE_COPY #define __P010 PAGE_COPY
#define __P011 PAGE_COPY #define __P011 PAGE_COPY
#define __P100 PAGE_READONLY #define __P100 PAGE_EXECREAD
#define __P101 PAGE_READONLY #define __P101 PAGE_EXECREAD
#define __P110 PAGE_COPY #define __P110 PAGE_COPY
#define __P111 PAGE_COPY #define __P111 PAGE_COPY
#define __S000 PAGE_NONE #define __S000 PAGE_NONE
#define __S001 PAGE_READONLY #define __S001 PAGE_READONLY
#define __S010 PAGE_SHARED #define __S010 PAGE_WRITEONLY
#define __S011 PAGE_SHARED #define __S011 PAGE_SHARED
#define __S100 PAGE_READONLY #define __S100 PAGE_EXECREAD
#define __S101 PAGE_READONLY #define __S101 PAGE_EXECREAD
#define __S110 PAGE_SHARED #define __S110 PAGE_RWX
#define __S111 PAGE_SHARED #define __S111 PAGE_RWX
#ifndef __ASSEMBLY__ #ifndef __ASSEMBLY__
@ -183,7 +362,17 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
* within a page table are directly modified. Thus, the following * within a page table are directly modified. Thus, the following
* hook is made available. * hook is made available.
*/ */
#ifdef CONFIG_X2TLB
static inline void set_pte(pte_t *ptep, pte_t pte)
{
ptep->pte_high = pte.pte_high;
smp_wmb();
ptep->pte_low = pte.pte_low;
}
#else
#define set_pte(pteptr, pteval) (*(pteptr) = pteval) #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
#endif
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
/* /*
@ -192,7 +381,7 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
*/ */
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval) #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
#define pte_pfn(x) ((unsigned long)(((x).pte >> PAGE_SHIFT))) #define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
@ -212,28 +401,52 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
* The following only work if pte_present() is true. * The following only work if pte_present() is true.
* Undefined behaviour if not.. * Undefined behaviour if not..
*/ */
static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; } #define pte_not_present(pte) (!(pte_val(pte) & _PAGE_PRESENT))
static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; } #define pte_dirty(pte) (pte_val(pte) & _PAGE_DIRTY)
static inline int pte_dirty(pte_t pte){ return pte_val(pte) & _PAGE_DIRTY; } #define pte_young(pte) (pte_val(pte) & _PAGE_ACCESSED)
static inline int pte_young(pte_t pte){ return pte_val(pte) & _PAGE_ACCESSED; } #define pte_file(pte) (pte_val(pte) & _PAGE_FILE)
static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
static inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_RW; }
static inline int pte_not_present(pte_t pte){ return !(pte_val(pte) & _PAGE_PRESENT); }
static inline pte_t pte_rdprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; } #ifdef CONFIG_X2TLB
static inline pte_t pte_exprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; } #define pte_read(pte) ((pte).pte_high & _PAGE_EXT_USER_READ)
static inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; } #define pte_exec(pte) ((pte).pte_high & _PAGE_EXT_USER_EXEC)
static inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; } #define pte_write(pte) ((pte).pte_high & _PAGE_EXT_USER_WRITE)
static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; } #else
static inline pte_t pte_mkread(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; } #define pte_read(pte) (pte_val(pte) & _PAGE_USER)
static inline pte_t pte_mkexec(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; } #define pte_exec(pte) (pte_val(pte) & _PAGE_USER)
static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; } #define pte_write(pte) (pte_val(pte) & _PAGE_RW)
static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
#ifdef CONFIG_HUGETLB_PAGE
static inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_SZHUGE)); return pte; }
#endif #endif
#define PTE_BIT_FUNC(h,fn,op) \
static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; }
#ifdef CONFIG_X2TLB
/*
* We cheat a bit in the SH-X2 TLB case. As the permission bits are
* individually toggled (and user permissions are entirely decoupled from
* kernel permissions), we attempt to couple them a bit more sanely here.
*/
PTE_BIT_FUNC(high, rdprotect, &= ~_PAGE_EXT_USER_READ);
PTE_BIT_FUNC(high, mkread, |= _PAGE_EXT_USER_READ | _PAGE_EXT_KERN_READ);
PTE_BIT_FUNC(high, wrprotect, &= ~_PAGE_EXT_USER_WRITE);
PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE);
PTE_BIT_FUNC(high, exprotect, &= ~_PAGE_EXT_USER_EXEC);
PTE_BIT_FUNC(high, mkexec, |= _PAGE_EXT_USER_EXEC | _PAGE_EXT_KERN_EXEC);
PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE);
#else
PTE_BIT_FUNC(low, rdprotect, &= ~_PAGE_USER);
PTE_BIT_FUNC(low, mkread, |= _PAGE_USER);
PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW);
PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW);
PTE_BIT_FUNC(low, exprotect, &= ~_PAGE_USER);
PTE_BIT_FUNC(low, mkexec, |= _PAGE_USER);
PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE);
#endif
PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY);
PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY);
PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED);
PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED);
/* /*
* Macro and implementation to make a page protection as uncachable. * Macro and implementation to make a page protection as uncachable.
*/ */
@ -258,7 +471,11 @@ static inline pgprot_t pgprot_noncached(pgprot_t _prot)
#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{ set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot))); return pte; } {
set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) |
pgprot_val(newprot)));
return pte;
}
#define pmd_page_vaddr(pmd) \ #define pmd_page_vaddr(pmd) \
((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
@ -283,8 +500,15 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
#define pte_unmap(pte) do { } while (0) #define pte_unmap(pte) do { } while (0)
#define pte_unmap_nested(pte) do { } while (0) #define pte_unmap_nested(pte) do { } while (0)
#ifdef CONFIG_X2TLB
#define pte_ERROR(e) \
printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \
&(e), (e).pte_high, (e).pte_low)
#else
#define pte_ERROR(e) \ #define pte_ERROR(e) \
printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
#endif
#define pgd_ERROR(e) \ #define pgd_ERROR(e) \
printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
@ -337,6 +561,9 @@ extern unsigned int kobjsize(const void *objp);
extern pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep); extern pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
#endif #endif
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
extern void paging_init(void);
#include <asm-generic/pgtable.h> #include <asm-generic/pgtable.h>
#endif /* !__ASSEMBLY__ */ #endif /* !__ASSEMBLY__ */