Commit 780602d7 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
Browse files

MIPS: mm: Standardise on _PAGE_NO_READ, drop _PAGE_READ 



Ever since support for RI/XI was implemented by commit 6dd9344c
("MIPS: Implement Read Inhibit/eXecute Inhibit") we've had a mixture of
_PAGE_READ & _PAGE_NO_READ bits. Rather than keep both around, switch
away from using _PAGE_READ to determine page presence & instead invert
the use to _PAGE_NO_READ. Wherever we formerly had no definition for
_PAGE_NO_READ, change what was _PAGE_READ to _PAGE_NO_READ. The end
result is that we consistently use _PAGE_NO_READ to determine whether a
page is readable, regardless of whether RI/XI is implemented.

Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Reviewed-by: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alex Smith <alex.smith@imgtec.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13116/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 69497700

arch/mips/include/asm/pgtable-bits.h

+4 −15
Original line number Diff line number Diff line
@@ -49,7 +49,6 @@ enum pgtable_bits { 


	/* Used only by software (masked out before writing EntryLo*) */

	_PAGE_PRESENT_SHIFT = 24,

	_PAGE_READ_SHIFT,

	_PAGE_WRITE_SHIFT,

	_PAGE_ACCESSED_SHIFT,

	_PAGE_MODIFIED_SHIFT,
@@ -66,7 +65,7 @@ enum pgtable_bits { 
enum pgtable_bits {

	/* Used only by software (writes to EntryLo ignored) */

	_PAGE_PRESENT_SHIFT,

	_PAGE_READ_SHIFT,

	_PAGE_NO_READ_SHIFT,

	_PAGE_WRITE_SHIFT,

	_PAGE_ACCESSED_SHIFT,

	_PAGE_MODIFIED_SHIFT,
@@ -85,7 +84,7 @@ enum pgtable_bits { 
	/* Used only by software (masked out before writing EntryLo*) */

	_PAGE_PRESENT_SHIFT,

#if !defined(CONFIG_CPU_MIPSR2) && !defined(CONFIG_CPU_MIPSR6)

	_PAGE_READ_SHIFT,

	_PAGE_NO_READ_SHIFT,

#endif

	_PAGE_WRITE_SHIFT,

	_PAGE_ACCESSED_SHIFT,
@@ -98,7 +97,6 @@ enum pgtable_bits { 
#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)

	_PAGE_NO_EXEC_SHIFT,

	_PAGE_NO_READ_SHIFT,

	_PAGE_READ_SHIFT = _PAGE_NO_READ_SHIFT,

#endif

	_PAGE_GLOBAL_SHIFT,

	_PAGE_VALID_SHIFT,
@@ -110,11 +108,6 @@ enum pgtable_bits { 


/* Used only by software */

#define _PAGE_PRESENT		(1 << _PAGE_PRESENT_SHIFT)

#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)

# define _PAGE_READ		(cpu_has_rixi ? 0 : (1 << _PAGE_READ_SHIFT))

#else

# define _PAGE_READ		(1 << _PAGE_READ_SHIFT)

#endif

#define _PAGE_WRITE		(1 << _PAGE_WRITE_SHIFT)

#define _PAGE_ACCESSED		(1 << _PAGE_ACCESSED_SHIFT)

#define _PAGE_MODIFIED		(1 << _PAGE_MODIFIED_SHIFT)
@@ -125,11 +118,10 @@ enum pgtable_bits { 
/* Used by TLB hardware (placed in EntryLo*) */

#if (defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32))

# define _PAGE_NO_EXEC		(1 << _PAGE_NO_EXEC_SHIFT)

# define _PAGE_NO_READ		(1 << _PAGE_NO_READ_SHIFT)

#elif defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)

# define _PAGE_NO_EXEC		(cpu_has_rixi ? (1 << _PAGE_NO_EXEC_SHIFT) : 0)

# define _PAGE_NO_READ		(cpu_has_rixi ? (1 << _PAGE_NO_READ_SHIFT) : 0)

#endif

#define _PAGE_NO_READ		(1 << _PAGE_NO_READ_SHIFT)

#define _PAGE_GLOBAL		(1 << _PAGE_GLOBAL_SHIFT)

#define _PAGE_VALID		(1 << _PAGE_VALID_SHIFT)

#define _PAGE_DIRTY		(1 << _PAGE_DIRTY_SHIFT)
@@ -145,9 +137,6 @@ enum pgtable_bits { 
#ifndef _PAGE_NO_EXEC

#define _PAGE_NO_EXEC		0

#endif

#ifndef _PAGE_NO_READ

#define _PAGE_NO_READ		0

#endif



#define _PAGE_SILENT_READ	_PAGE_VALID

#define _PAGE_SILENT_WRITE	_PAGE_DIRTY
@@ -245,7 +234,7 @@ static inline uint64_t pte_to_entrylo(unsigned long pte_val) 
#define _CACHE_UNCACHED_ACCELERATED	(7<<_CACHE_SHIFT)

#endif



#define __READABLE	(_PAGE_SILENT_READ | _PAGE_READ | _PAGE_ACCESSED)

#define __READABLE	(_PAGE_SILENT_READ | _PAGE_ACCESSED)

#define __WRITEABLE	(_PAGE_SILENT_WRITE | _PAGE_WRITE | _PAGE_MODIFIED)



#define _PAGE_CHG_MASK	(_PAGE_ACCESSED | _PAGE_MODIFIED |	\

arch/mips/include/asm/pgtable.h

+7 −16
Original line number Diff line number Diff line
@@ -23,18 +23,19 @@ 
struct mm_struct;

struct vm_area_struct;



#define PAGE_NONE	__pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)

#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | \

#define PAGE_NONE	__pgprot(_PAGE_PRESENT | _PAGE_NO_READ | \

				 _CACHE_CACHABLE_NONCOHERENT)

#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | \

				 _page_cachable_default)

#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_NO_EXEC | \

#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \

				 _page_cachable_default)

#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_READ | \

#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | \

				 _page_cachable_default)

#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \

				 _PAGE_GLOBAL | _page_cachable_default)

#define PAGE_KERNEL_NC	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \

				 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)

#define PAGE_USERIO	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \

#define PAGE_USERIO	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | \

				 _page_cachable_default)

#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \

			__WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
@@ -338,7 +339,7 @@ static inline pte_t pte_mkdirty(pte_t pte) 
static inline pte_t pte_mkyoung(pte_t pte)

{

	pte.pte_low |= _PAGE_ACCESSED;

	if (pte.pte_low & _PAGE_READ)

	if (!(pte.pte_low & _PAGE_NO_READ))

		pte.pte_high |= _PAGE_SILENT_READ;

	return pte;

}
@@ -384,13 +385,8 @@ static inline pte_t pte_mkdirty(pte_t pte) 
static inline pte_t pte_mkyoung(pte_t pte)

{

	pte_val(pte) |= _PAGE_ACCESSED;

#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) || defined(CONFIG_CPU_LOONGSON3)

	if (!(pte_val(pte) & _PAGE_NO_READ))

		pte_val(pte) |= _PAGE_SILENT_READ;

	else

#endif

	if (pte_val(pte) & _PAGE_READ)

		pte_val(pte) |= _PAGE_SILENT_READ;

	return pte;

}
@@ -570,13 +566,8 @@ static inline pmd_t pmd_mkyoung(pmd_t pmd) 
{

	pmd_val(pmd) |= _PAGE_ACCESSED;



#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) || defined(CONFIG_CPU_LOONGSON3)

	if (!(pmd_val(pmd) & _PAGE_NO_READ))

		pmd_val(pmd) |= _PAGE_SILENT_READ;

	else

#endif

	if (pmd_val(pmd) & _PAGE_READ)

		pmd_val(pmd) |= _PAGE_SILENT_READ;



	return pmd;

}

arch/mips/mm/tlbex.c

+4 −9
Original line number Diff line number Diff line
@@ -234,20 +234,16 @@ static void output_pgtable_bits_defines(void) 
	pr_debug("\n");



	pr_define("_PAGE_PRESENT_SHIFT %d\n", _PAGE_PRESENT_SHIFT);

	pr_define("_PAGE_READ_SHIFT %d\n", _PAGE_READ_SHIFT);

	pr_define("_PAGE_NO_READ_SHIFT %d\n", _PAGE_NO_READ_SHIFT);

	pr_define("_PAGE_WRITE_SHIFT %d\n", _PAGE_WRITE_SHIFT);

	pr_define("_PAGE_ACCESSED_SHIFT %d\n", _PAGE_ACCESSED_SHIFT);

	pr_define("_PAGE_MODIFIED_SHIFT %d\n", _PAGE_MODIFIED_SHIFT);

#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT

	pr_define("_PAGE_HUGE_SHIFT %d\n", _PAGE_HUGE_SHIFT);

#endif

#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)

	if (cpu_has_rixi) {

#ifdef _PAGE_NO_EXEC_SHIFT

	if (cpu_has_rixi)

		pr_define("_PAGE_NO_EXEC_SHIFT %d\n", _PAGE_NO_EXEC_SHIFT);

		pr_define("_PAGE_NO_READ_SHIFT %d\n", _PAGE_NO_READ_SHIFT);

#endif

	}

#endif

	pr_define("_PAGE_GLOBAL_SHIFT %d\n", _PAGE_GLOBAL_SHIFT);

	pr_define("_PAGE_VALID_SHIFT %d\n", _PAGE_VALID_SHIFT);
@@ -1728,9 +1724,8 @@ build_pte_present(u32 **p, struct uasm_reloc **r, 
			cur = t;

		}

		uasm_i_andi(p, t, cur,

			(_PAGE_PRESENT | _PAGE_READ) >> _PAGE_PRESENT_SHIFT);

		uasm_i_xori(p, t, t,

			(_PAGE_PRESENT | _PAGE_READ) >> _PAGE_PRESENT_SHIFT);

			(_PAGE_PRESENT | _PAGE_NO_READ) >> _PAGE_PRESENT_SHIFT);

		uasm_i_xori(p, t, t, _PAGE_PRESENT >> _PAGE_PRESENT_SHIFT);

		uasm_il_bnez(p, r, t, lid);

		if (pte == t)

			/* You lose the SMP race :-(*/

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