Commit 046835b4 authored by Vladimir Murzin's avatar Vladimir Murzin Committed by Russell King
Browse files

ARM: 8757/1: NOMMU: Support PMSAv8 MPU 



ARMv8R/M architecture defines new memory protection scheme - PMSAv8
which is not compatible with PMSAv7.

Key differences to PMSAv7 are:
 - Region geometry is defined by base and limit addresses
 - Addresses need to be either 32 or 64 byte aligned
 - No region priority due to overlapping regions are not allowed
 - It is unified, i.e. no distinction between data/instruction regions
 - Memory attributes are controlled via MAIR

This patch implements support for PMSAv8 MPU defined by ARMv8R/M
architecture.

Signed-off-by: default avatarVladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
parent 3c241210

arch/arm/include/asm/mpu.h

+49 −3
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
/* ID_MMFR0 data relevant to MPU */

#define MMFR0_PMSA		(0xF << 4)

#define MMFR0_PMSAv7		(3 << 4)

#define MMFR0_PMSAv8		(4 << 4)



/* MPU D/I Size Register fields */

#define PMSAv7_RSR_SZ		1
@@ -47,12 +48,43 @@ 
#define PMSAv7_AP_PL1RW_PL0R0	(0x2 << 8)

#define PMSAv7_AP_PL1RW_PL0NA	(0x1 << 8)



#define PMSAv8_BAR_XN		1



#define PMSAv8_LAR_EN		1

#define PMSAv8_LAR_IDX(n)	(((n) & 0x7) << 1)





#define PMSAv8_AP_PL1RW_PL0NA	(0 << 1)

#define PMSAv8_AP_PL1RW_PL0RW	(1 << 1)

#define PMSAv8_AP_PL1RO_PL0RO	(3 << 1)



#ifdef CONFIG_SMP

#define PMSAv8_RGN_SHARED	(3 << 3) // inner sharable

#else

#define PMSAv8_RGN_SHARED	(0 << 3)

#endif



#define PMSAv8_RGN_DEVICE_nGnRnE	0

#define PMSAv8_RGN_NORMAL		1



#define PMSAv8_MAIR(attr, mt)	((attr) << ((mt) * 8))



#ifdef CONFIG_CPU_V7M

#define PMSAv8_MINALIGN		32

#else

#define PMSAv8_MINALIGN		64

#endif



/* For minimal static MPU region configurations */

#define PMSAv7_PROBE_REGION	0

#define PMSAv7_BG_REGION	1

#define PMSAv7_RAM_REGION	2

#define PMSAv7_ROM_REGION	3



/* Fixed for PMSAv8 only */

#define PMSAv8_XIP_REGION	0

#define PMSAv8_KERNEL_REGION	1



/* Maximum number of regions Linux is interested in */

#define MPU_MAX_REGIONS	16
@@ -63,9 +95,18 @@ 


struct mpu_rgn {

	/* Assume same attributes for d/i-side  */

	u32 drbar;

	u32 drsr;

	u32 dracr;

	union {

		u32 drbar;   /* PMSAv7 */

		u32 prbar;   /* PMSAv8 */

	};

	union {

		u32 drsr;   /* PMSAv7 */

		u32 prlar;  /* PMSAv8 */

	};

	union {

		u32 dracr;  /* PMSAv7 */

		u32 unused; /* not used in PMSAv8 */

	};

};



struct mpu_rgn_info {
@@ -76,10 +117,15 @@ extern struct mpu_rgn_info mpu_rgn_info; 


#ifdef CONFIG_ARM_MPU

extern void __init pmsav7_adjust_lowmem_bounds(void);

extern void __init pmsav8_adjust_lowmem_bounds(void);



extern void __init pmsav7_setup(void);

extern void __init pmsav8_setup(void);

#else

static inline void pmsav7_adjust_lowmem_bounds(void) {};

static inline void pmsav8_adjust_lowmem_bounds(void) {};

static inline void pmsav7_setup(void) {};

static inline void pmsav8_setup(void) {};

#endif



#endif /* __ASSEMBLY__ */

arch/arm/include/asm/v7m.h

+8 −0
Original line number Diff line number Diff line
@@ -68,6 +68,14 @@ 
#define PMSAv7_RBAR		0x9c

#define PMSAv7_RASR		0xa0



#define PMSAv8_RNR		0x98

#define PMSAv8_RBAR		0x9c

#define PMSAv8_RLAR		0xa0

#define PMSAv8_RBAR_A(n)	(PMSAv8_RBAR + 8*(n))

#define PMSAv8_RLAR_A(n)	(PMSAv8_RLAR + 8*(n))

#define PMSAv8_MAIR0		0xc0

#define PMSAv8_MAIR1		0xc4



/* Cache opeartions */

#define	V7M_SCB_ICIALLU		0x250	/* I-cache invalidate all to PoU */

#define	V7M_SCB_ICIMVAU		0x258	/* I-cache invalidate by MVA to PoU */

arch/arm/kernel/asm-offsets.c

+2 −0
Original line number Diff line number Diff line
@@ -197,6 +197,8 @@ int main(void) 
  DEFINE(MPU_RGN_DRBAR,	offsetof(struct mpu_rgn, drbar));

  DEFINE(MPU_RGN_DRSR,	offsetof(struct mpu_rgn, drsr));

  DEFINE(MPU_RGN_DRACR,	offsetof(struct mpu_rgn, dracr));

  DEFINE(MPU_RGN_PRBAR,	offsetof(struct mpu_rgn, prbar));

  DEFINE(MPU_RGN_PRLAR,	offsetof(struct mpu_rgn, prlar));

#endif

  return 0; 

}

arch/arm/kernel/head-nommu.S

+163 −0
Original line number Diff line number Diff line
@@ -132,6 +132,25 @@ M_CLASS(ldr r3, [r12, 0x50]) 
AR_CLASS(mrc	p15, 0, r3, c0, c1, 4)          @ Read ID_MMFR0

	and	r3, r3, #(MMFR0_PMSA)           @ PMSA field

	teq	r3, #(MMFR0_PMSAv7)             @ PMSA v7

	beq	1f

	teq	r3, #(MMFR0_PMSAv8)		@ PMSA v8

	/*

	 * Memory region attributes for PMSAv8:

	 *

	 *   n = AttrIndx[2:0]

	 *                      n       MAIR

	 *   DEVICE_nGnRnE      000     00000000

	 *   NORMAL             001     11111111

	 */

	ldreq	r3, =PMSAv8_MAIR(0x00, PMSAv8_RGN_DEVICE_nGnRnE) | \

		     PMSAv8_MAIR(0xff, PMSAv8_RGN_NORMAL)

AR_CLASS(mcreq	p15, 0, r3, c10, c2, 0)		@ MAIR 0

M_CLASS(streq	r3, [r12, #PMSAv8_MAIR0])

	moveq	r3, #0

AR_CLASS(mcreq	p15, 0, r3, c10, c2, 1)		@ MAIR 1

M_CLASS(streq	r3, [r12, #PMSAv8_MAIR1])



1:

#endif

#ifdef CONFIG_CPU_CP15

	/*
@@ -235,6 +254,8 @@ M_CLASS(ldr r0, [r12, 0x50]) 
	and	r0, r0, #(MMFR0_PMSA)		@ PMSA field

	teq	r0, #(MMFR0_PMSAv7)		@ PMSA v7

	beq	__setup_pmsa_v7

	teq	r0, #(MMFR0_PMSAv8)		@ PMSA v8

	beq	__setup_pmsa_v8



	ret	lr

ENDPROC(__setup_mpu)
@@ -304,6 +325,119 @@ M_CLASS(ldr r0, [r12, #MPU_TYPE]) 
	ret	lr

ENDPROC(__setup_pmsa_v7)



ENTRY(__setup_pmsa_v8)

	mov	r0, #0

AR_CLASS(mcr	p15, 0, r0, c6, c2, 1)		@ PRSEL

M_CLASS(str	r0, [r12, #PMSAv8_RNR])

	isb



#ifdef CONFIG_XIP_KERNEL

	ldr	r5, =CONFIG_XIP_PHYS_ADDR		@ ROM start

	ldr     r6, =(_exiprom)				@ ROM end

	sub	r6, r6, #1

	bic	r6, r6, #(PMSAv8_MINALIGN - 1)



	orr	r5, r5, #(PMSAv8_AP_PL1RW_PL0NA | PMSAv8_RGN_SHARED)

	orr	r6, r6, #(PMSAv8_LAR_IDX(PMSAv8_RGN_NORMAL) | PMSAv8_LAR_EN)



AR_CLASS(mcr	p15, 0, r5, c6, c8, 0)			@ PRBAR0

AR_CLASS(mcr	p15, 0, r6, c6, c8, 1)			@ PRLAR0

M_CLASS(str	r5, [r12, #PMSAv8_RBAR_A(0)])

M_CLASS(str	r6, [r12, #PMSAv8_RLAR_A(0)])

#endif



	ldr	r5, =KERNEL_START

	ldr	r6, =KERNEL_END

	sub	r6, r6, #1

	bic	r6, r6, #(PMSAv8_MINALIGN - 1)



	orr	r5, r5, #(PMSAv8_AP_PL1RW_PL0NA | PMSAv8_RGN_SHARED)

	orr	r6, r6, #(PMSAv8_LAR_IDX(PMSAv8_RGN_NORMAL) | PMSAv8_LAR_EN)



AR_CLASS(mcr	p15, 0, r5, c6, c8, 4)			@ PRBAR1

AR_CLASS(mcr	p15, 0, r6, c6, c8, 5)			@ PRLAR1

M_CLASS(str	r5, [r12, #PMSAv8_RBAR_A(1)])

M_CLASS(str	r6, [r12, #PMSAv8_RLAR_A(1)])



	/* Setup Background: 0x0 - min(KERNEL_START, XIP_PHYS_ADDR) */

#ifdef CONFIG_XIP_KERNEL

	ldr	r6, =KERNEL_START

	ldr	r5, =CONFIG_XIP_PHYS_ADDR

	cmp	r6, r5

	movcs	r6, r5

#else

	ldr	r6, =KERNEL_START

#endif

	cmp	r6, #0

	beq	1f



	mov	r5, #0

	sub	r6, r6, #1

	bic	r6, r6, #(PMSAv8_MINALIGN - 1)



	orr	r5, r5, #(PMSAv8_AP_PL1RW_PL0NA | PMSAv8_RGN_SHARED | PMSAv8_BAR_XN)

	orr	r6, r6, #(PMSAv8_LAR_IDX(PMSAv8_RGN_DEVICE_nGnRnE) | PMSAv8_LAR_EN)



AR_CLASS(mcr	p15, 0, r5, c6, c9, 0)			@ PRBAR2

AR_CLASS(mcr	p15, 0, r6, c6, c9, 1)			@ PRLAR2

M_CLASS(str	r5, [r12, #PMSAv8_RBAR_A(2)])

M_CLASS(str	r6, [r12, #PMSAv8_RLAR_A(2)])



1:

	/* Setup Background: max(KERNEL_END, _exiprom) - 0xffffffff */

#ifdef CONFIG_XIP_KERNEL

	ldr	r5, =KERNEL_END

	ldr	r6, =(_exiprom)

	cmp	r5, r6

	movcc	r5, r6

#else

	ldr	r5, =KERNEL_END

#endif

	mov	r6, #0xffffffff

	bic	r6, r6, #(PMSAv8_MINALIGN - 1)



	orr	r5, r5, #(PMSAv8_AP_PL1RW_PL0NA | PMSAv8_RGN_SHARED | PMSAv8_BAR_XN)

	orr	r6, r6, #(PMSAv8_LAR_IDX(PMSAv8_RGN_DEVICE_nGnRnE) | PMSAv8_LAR_EN)



AR_CLASS(mcr	p15, 0, r5, c6, c9, 4)			@ PRBAR3

AR_CLASS(mcr	p15, 0, r6, c6, c9, 5)			@ PRLAR3

M_CLASS(str	r5, [r12, #PMSAv8_RBAR_A(3)])

M_CLASS(str	r6, [r12, #PMSAv8_RLAR_A(3)])



#ifdef CONFIG_XIP_KERNEL

	/* Setup Background: min(_exiprom, KERNEL_END) - max(KERNEL_START, XIP_PHYS_ADDR) */

	ldr	r5, =(_exiprom)

	ldr	r6, =KERNEL_END

	cmp	r5, r6

	movcs	r5, r6



	ldr	r6, =KERNEL_START

	ldr	r0, =CONFIG_XIP_PHYS_ADDR

	cmp	r6, r0

	movcc	r6, r0



	sub	r6, r6, #1

	bic	r6, r6, #(PMSAv8_MINALIGN - 1)



	orr	r5, r5, #(PMSAv8_AP_PL1RW_PL0NA | PMSAv8_RGN_SHARED | PMSAv8_BAR_XN)

	orr	r6, r6, #(PMSAv8_LAR_IDX(PMSAv8_RGN_DEVICE_nGnRnE) | PMSAv8_LAR_EN)



#ifdef CONFIG_CPU_V7M

	/* There is no alias for n == 4 */

	mov	r0, #4

	str	r0, [r12, #PMSAv8_RNR]			@ PRSEL

	isb



	str	r5, [r12, #PMSAv8_RBAR_A(0)]

	str	r6, [r12, #PMSAv8_RLAR_A(0)]

#else

	mcr	p15, 0, r5, c6, c10, 1			@ PRBAR4

	mcr	p15, 0, r6, c6, c10, 2			@ PRLAR4

#endif

#endif

	ret	lr

ENDPROC(__setup_pmsa_v8)



#ifdef CONFIG_SMP

/*

 * r6: pointer at mpu_rgn_info
@@ -319,6 +453,8 @@ ENTRY(__secondary_setup_mpu) 
	and	r0, r0, #(MMFR0_PMSA)		@ PMSA field

	teq	r0, #(MMFR0_PMSAv7)		@ PMSA v7

	beq	__secondary_setup_pmsa_v7

	teq	r0, #(MMFR0_PMSAv8)		@ PMSA v8

	beq	__secondary_setup_pmsa_v8

	b	__error_p

ENDPROC(__secondary_setup_mpu)
@@ -361,6 +497,33 @@ ENTRY(__secondary_setup_pmsa_v7) 
	ret	lr

ENDPROC(__secondary_setup_pmsa_v7)



ENTRY(__secondary_setup_pmsa_v8)

	ldr	r4, [r6, #MPU_RNG_INFO_USED]

#ifndef CONFIG_XIP_KERNEL

	add	r4, r4, #1

#endif

	mov	r5, #MPU_RNG_SIZE

	add	r3, r6, #MPU_RNG_INFO_RNGS

	mla	r3, r4, r5, r3



1:

	sub	r3, r3, #MPU_RNG_SIZE

	sub	r4, r4, #1



	mcr	p15, 0, r4, c6, c2, 1		@ PRSEL

	isb



	ldr	r5, [r3, #MPU_RGN_PRBAR]

	ldr	r6, [r3, #MPU_RGN_PRLAR]



	mcr	p15, 0, r5, c6, c3, 0		@ PRBAR

	mcr	p15, 0, r6, c6, c3, 1           @ PRLAR



	cmp	r4, #0

	bgt	1b



	ret	lr

ENDPROC(__secondary_setup_pmsa_v8)

#endif /* CONFIG_SMP */

#endif /* CONFIG_ARM_MPU */

#include "head-common.S"

arch/arm/kernel/vmlinux-xip.lds.S

+4 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <asm/cache.h>

#include <asm/thread_info.h>

#include <asm/memory.h>

#include <asm/mpu.h>

#include <asm/page.h>



#include "vmlinux.lds.h"
@@ -148,6 +149,9 @@ SECTIONS 
	__init_end = .;



	BSS_SECTION(0, 0, 8)

#ifdef CONFIG_ARM_MPU

	. = ALIGN(PMSAv8_MINALIGN);

#endif

	_end = .;



	STABS_DEBUG

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