[linux-block.git] / arch / arm / mm / proc-v7-2level.S

/*
 * arch/arm/mm/proc-v7-2level.S
 *
 * Copyright (C) 2001 Deep Blue Solutions Ltd.
 *
 * 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.
 */

#define TTB_S		(1 << 1)
#define TTB_RGN_NC	(0 << 3)
#define TTB_RGN_OC_WBWA	(1 << 3)
#define TTB_RGN_OC_WT	(2 << 3)
#define TTB_RGN_OC_WB	(3 << 3)
#define TTB_NOS		(1 << 5)
#define TTB_IRGN_NC	((0 << 0) | (0 << 6))
#define TTB_IRGN_WBWA	((0 << 0) | (1 << 6))
#define TTB_IRGN_WT	((1 << 0) | (0 << 6))
#define TTB_IRGN_WB	((1 << 0) | (1 << 6))

/* PTWs cacheable, inner WB not shareable, outer WB not shareable */
#define TTB_FLAGS_UP	TTB_IRGN_WB|TTB_RGN_OC_WB
#define PMD_FLAGS_UP	PMD_SECT_WB

/* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */
#define TTB_FLAGS_SMP	TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA
#define PMD_FLAGS_SMP	PMD_SECT_WBWA|PMD_SECT_S

/*
 *	cpu_v7_switch_mm(pgd_phys, tsk)
 *
 *	Set the translation table base pointer to be pgd_phys
 *
 *	- pgd_phys - physical address of new TTB
 *
 *	It is assumed that:
 *	- we are not using split page tables
 */
ENTRY(cpu_v7_switch_mm)
#ifdef CONFIG_MMU
	mov	r2, #0
	ldr	r1, [r1, #MM_CONTEXT_ID]	@ get mm->context.id
	ALT_SMP(orr	r0, r0, #TTB_FLAGS_SMP)
	ALT_UP(orr	r0, r0, #TTB_FLAGS_UP)
#ifdef CONFIG_ARM_ERRATA_430973
	mcr	p15, 0, r2, c7, c5, 6		@ flush BTAC/BTB
#endif
#ifdef CONFIG_ARM_ERRATA_754322
	dsb
#endif
	mcr	p15, 0, r1, c13, c0, 1		@ set context ID
	isb
	mcr	p15, 0, r0, c2, c0, 0		@ set TTB 0
	isb
#endif
	mov	pc, lr
ENDPROC(cpu_v7_switch_mm)

/*
 *	cpu_v7_set_pte_ext(ptep, pte)
 *
 *	Set a level 2 translation table entry.
 *
 *	- ptep  - pointer to level 2 translation table entry
 *		  (hardware version is stored at +2048 bytes)
 *	- pte   - PTE value to store
 *	- ext	- value for extended PTE bits
 */
ENTRY(cpu_v7_set_pte_ext)
#ifdef CONFIG_MMU
	str	r1, [r0]			@ linux version

	bic	r3, r1, #0x000003f0
	bic	r3, r3, #PTE_TYPE_MASK
	orr	r3, r3, r2
	orr	r3, r3, #PTE_EXT_AP0 | 2

	tst	r1, #1 << 4
	orrne	r3, r3, #PTE_EXT_TEX(1)

	eor	r1, r1, #L_PTE_DIRTY
	tst	r1, #L_PTE_RDONLY | L_PTE_DIRTY
	orrne	r3, r3, #PTE_EXT_APX

	tst	r1, #L_PTE_USER
	orrne	r3, r3, #PTE_EXT_AP1
#ifdef CONFIG_CPU_USE_DOMAINS
	@ allow kernel read/write access to read-only user pages
	tstne	r3, #PTE_EXT_APX
	bicne	r3, r3, #PTE_EXT_APX | PTE_EXT_AP0
#endif

	tst	r1, #L_PTE_XN
	orrne	r3, r3, #PTE_EXT_XN

	tst	r1, #L_PTE_YOUNG
	tstne	r1, #L_PTE_PRESENT
	moveq	r3, #0

 ARM(	str	r3, [r0, #2048]! )
 THUMB(	add	r0, r0, #2048 )
 THUMB(	str	r3, [r0] )
	mcr	p15, 0, r0, c7, c10, 1		@ flush_pte
#endif
	mov	pc, lr
ENDPROC(cpu_v7_set_pte_ext)

	/*
	 * Memory region attributes with SCTLR.TRE=1
	 *
	 *   n = TEX[0],C,B
	 *   TR = PRRR[2n+1:2n]		- memory type
	 *   IR = NMRR[2n+1:2n]		- inner cacheable property
	 *   OR = NMRR[2n+17:2n+16]	- outer cacheable property
	 *
	 *			n	TR	IR	OR
	 *   UNCACHED		000	00
	 *   BUFFERABLE		001	10	00	00
	 *   WRITETHROUGH	010	10	10	10
	 *   WRITEBACK		011	10	11	11
	 *   reserved		110
	 *   WRITEALLOC		111	10	01	01
	 *   DEV_SHARED		100	01
	 *   DEV_NONSHARED	100	01
	 *   DEV_WC		001	10
	 *   DEV_CACHED		011	10
	 *
	 * Other attributes:
	 *
	 *   DS0 = PRRR[16] = 0		- device shareable property
	 *   DS1 = PRRR[17] = 1		- device shareable property
	 *   NS0 = PRRR[18] = 0		- normal shareable property
	 *   NS1 = PRRR[19] = 1		- normal shareable property
	 *   NOS = PRRR[24+n] = 1	- not outer shareable
	 */
.equ	PRRR,	0xff0a81a8
.equ	NMRR,	0x40e040e0

	/*
	 * Macro for setting up the TTBRx and TTBCR registers.
	 * - \ttb0 and \ttb1 updated with the corresponding flags.
	 */
	.macro	v7_ttb_setup, zero, ttbr0, ttbr1, tmp
	mcr	p15, 0, \zero, c2, c0, 2	@ TTB control register
	ALT_SMP(orr	\ttbr0, \ttbr0, #TTB_FLAGS_SMP)
	ALT_UP(orr	\ttbr0, \ttbr0, #TTB_FLAGS_UP)
	ALT_SMP(orr	\ttbr1, \ttbr1, #TTB_FLAGS_SMP)
	ALT_UP(orr	\ttbr1, \ttbr1, #TTB_FLAGS_UP)
	mcr	p15, 0, \ttbr1, c2, c0, 1	@ load TTB1
	.endm

	__CPUINIT

	/*   AT
	 *  TFR   EV X F   I D LR    S
	 * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
	 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
	 *    1    0 110       0011 1100 .111 1101 < we want
	 */
	.align	2
	.type	v7_crval, #object
v7_crval:
	crval	clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c

	.previous
Commit	Line	Data
8d2cd3a3 CM	1	/*
	2	* arch/arm/mm/proc-v7-2level.S
	3	*
	4	* Copyright (C) 2001 Deep Blue Solutions Ltd.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#define TTB_S (1 << 1)
	12	#define TTB_RGN_NC (0 << 3)
	13	#define TTB_RGN_OC_WBWA (1 << 3)
	14	#define TTB_RGN_OC_WT (2 << 3)
	15	#define TTB_RGN_OC_WB (3 << 3)
	16	#define TTB_NOS (1 << 5)
	17	#define TTB_IRGN_NC ((0 << 0) \| (0 << 6))
	18	#define TTB_IRGN_WBWA ((0 << 0) \| (1 << 6))
	19	#define TTB_IRGN_WT ((1 << 0) \| (0 << 6))
	20	#define TTB_IRGN_WB ((1 << 0) \| (1 << 6))
	21
	22	/* PTWs cacheable, inner WB not shareable, outer WB not shareable */
	23	#define TTB_FLAGS_UP TTB_IRGN_WB\|TTB_RGN_OC_WB
	24	#define PMD_FLAGS_UP PMD_SECT_WB
	25
	26	/* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */
	27	#define TTB_FLAGS_SMP TTB_IRGN_WBWA\|TTB_S\|TTB_NOS\|TTB_RGN_OC_WBWA
	28	#define PMD_FLAGS_SMP PMD_SECT_WBWA\|PMD_SECT_S
	29
	30	/*
	31	* cpu_v7_switch_mm(pgd_phys, tsk)
	32	*
	33	* Set the translation table base pointer to be pgd_phys
	34	*
	35	* - pgd_phys - physical address of new TTB
	36	*
	37	* It is assumed that:
	38	* - we are not using split page tables
	39	*/
	40	ENTRY(cpu_v7_switch_mm)
	41	#ifdef CONFIG_MMU
	42	mov r2, #0
	43	ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id
	44	ALT_SMP(orr r0, r0, #TTB_FLAGS_SMP)
	45	ALT_UP(orr r0, r0, #TTB_FLAGS_UP)
	46	#ifdef CONFIG_ARM_ERRATA_430973
	47	mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB
	48	#endif
8d2cd3a3 CM	49	#ifdef CONFIG_ARM_ERRATA_754322
	50	dsb
	51	#endif
	52	mcr p15, 0, r1, c13, c0, 1 @ set context ID
	53	isb
3c5f7e7b WD	54	mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
3c5f7e7b WD	55	isb
8d2cd3a3 CM	56	#endif
	57	mov pc, lr
	58	ENDPROC(cpu_v7_switch_mm)
	59
	60	/*
	61	* cpu_v7_set_pte_ext(ptep, pte)
	62	*
	63	* Set a level 2 translation table entry.
	64	*
	65	* - ptep - pointer to level 2 translation table entry
	66	* (hardware version is stored at +2048 bytes)
	67	* - pte - PTE value to store
	68	* - ext - value for extended PTE bits
	69	*/
	70	ENTRY(cpu_v7_set_pte_ext)
	71	#ifdef CONFIG_MMU
	72	str r1, [r0] @ linux version
	73
	74	bic r3, r1, #0x000003f0
	75	bic r3, r3, #PTE_TYPE_MASK
	76	orr r3, r3, r2
	77	orr r3, r3, #PTE_EXT_AP0 \| 2
	78
	79	tst r1, #1 << 4
	80	orrne r3, r3, #PTE_EXT_TEX(1)
	81
	82	eor r1, r1, #L_PTE_DIRTY
	83	tst r1, #L_PTE_RDONLY \| L_PTE_DIRTY
	84	orrne r3, r3, #PTE_EXT_APX
	85
	86	tst r1, #L_PTE_USER
	87	orrne r3, r3, #PTE_EXT_AP1
	88	#ifdef CONFIG_CPU_USE_DOMAINS
	89	@ allow kernel read/write access to read-only user pages
	90	tstne r3, #PTE_EXT_APX
	91	bicne r3, r3, #PTE_EXT_APX \| PTE_EXT_AP0
	92	#endif
	93
	94	tst r1, #L_PTE_XN
	95	orrne r3, r3, #PTE_EXT_XN
	96
	97	tst r1, #L_PTE_YOUNG
	98	tstne r1, #L_PTE_PRESENT
	99	moveq r3, #0
	100
	101	ARM( str r3, [r0, #2048]! )
	102	THUMB( add r0, r0, #2048 )
	103	THUMB( str r3, [r0] )
	104	mcr p15, 0, r0, c7, c10, 1 @ flush_pte
	105	#endif
	106	mov pc, lr
	107	ENDPROC(cpu_v7_set_pte_ext)
	108
	109	/*
	110	* Memory region attributes with SCTLR.TRE=1
	111	*
	112	* n = TEX[0],C,B
	113	* TR = PRRR[2n+1:2n] - memory type
	114	* IR = NMRR[2n+1:2n] - inner cacheable property
	115	* OR = NMRR[2n+17:2n+16] - outer cacheable property
	116	*
	117	* n TR IR OR
	118	* UNCACHED 000 00
	119	* BUFFERABLE 001 10 00 00
120	* WRITETHROUGH 010 10 10 10
121	* WRITEBACK 011 10 11 11
122	* reserved 110
123	* WRITEALLOC 111 10 01 01
124	* DEV_SHARED 100 01
125	* DEV_NONSHARED 100 01
126	* DEV_WC 001 10
127	* DEV_CACHED 011 10
128	*
129	* Other attributes:
130	*
131	* DS0 = PRRR[16] = 0 - device shareable property
132	* DS1 = PRRR[17] = 1 - device shareable property
133	* NS0 = PRRR[18] = 0 - normal shareable property
134	* NS1 = PRRR[19] = 1 - normal shareable property
135	* NOS = PRRR[24+n] = 1 - not outer shareable
136	*/
137	.equ PRRR, 0xff0a81a8
138	.equ NMRR, 0x40e040e0
139
140	/*
141	* Macro for setting up the TTBRx and TTBCR registers.
142	* - \ttb0 and \ttb1 updated with the corresponding flags.
143	*/
144	.macro v7_ttb_setup, zero, ttbr0, ttbr1, tmp
145	mcr p15, 0, \zero, c2, c0, 2 @ TTB control register
146	ALT_SMP(orr \ttbr0, \ttbr0, #TTB_FLAGS_SMP)
147	ALT_UP(orr \ttbr0, \ttbr0, #TTB_FLAGS_UP)
148	ALT_SMP(orr \ttbr1, \ttbr1, #TTB_FLAGS_SMP)
149	ALT_UP(orr \ttbr1, \ttbr1, #TTB_FLAGS_UP)
150	mcr p15, 0, \ttbr1, c2, c0, 1 @ load TTB1
151	.endm
152
153	__CPUINIT
154
155	/* AT
156	* TFR EV X F I D LR S
157	* .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
158	* rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
159	* 1 0 110 0011 1100 .111 1101 < we want
160	*/
161	.align 2
162	.type v7_crval, #object
163	v7_crval:
164	crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c
165
166	.previous