1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * arch/arm/mm/proc-v7-3level.S
  4 *
  5 * Copyright (C) 2001 Deep Blue Solutions Ltd.
  6 * Copyright (C) 2011 ARM Ltd.
  7 * Author: Catalin Marinas <catalin.marinas@arm.com>
  8 *   based on arch/arm/mm/proc-v7-2level.S
  9 */
 10#include <asm/assembler.h>
 11
 12#define TTB_IRGN_NC	(0 << 8)
 13#define TTB_IRGN_WBWA	(1 << 8)
 14#define TTB_IRGN_WT	(2 << 8)
 15#define TTB_IRGN_WB	(3 << 8)
 16#define TTB_RGN_NC	(0 << 10)
 17#define TTB_RGN_OC_WBWA	(1 << 10)
 18#define TTB_RGN_OC_WT	(2 << 10)
 19#define TTB_RGN_OC_WB	(3 << 10)
 20#define TTB_S		(3 << 12)
 21#define TTB_EAE		(1 << 31)
 22
 23/* PTWs cacheable, inner WB not shareable, outer WB not shareable */
 24#define TTB_FLAGS_UP	(TTB_IRGN_WB|TTB_RGN_OC_WB)
 25#define PMD_FLAGS_UP	(PMD_SECT_WB)
 26
 27/* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */
 28#define TTB_FLAGS_SMP	(TTB_IRGN_WBWA|TTB_S|TTB_RGN_OC_WBWA)
 29#define PMD_FLAGS_SMP	(PMD_SECT_WBWA|PMD_SECT_S)
 30
 31#ifndef __ARMEB__
 32#  define rpgdl	r0
 33#  define rpgdh	r1
 34#else
 35#  define rpgdl	r1
 36#  define rpgdh	r0
 37#endif
 38
 39/*
 40 * cpu_v7_switch_mm(pgd_phys, tsk)
 41 *
 42 * Set the translation table base pointer to be pgd_phys (physical address of
 43 * the new TTB).
 44 */
 45ENTRY(cpu_v7_switch_mm)
 46#ifdef CONFIG_MMU
 47	mmid	r2, r2
 48	asid	r2, r2
 49	orr	rpgdh, rpgdh, r2, lsl #(48 - 32)	@ upper 32-bits of pgd
 50	mcrr	p15, 0, rpgdl, rpgdh, c2		@ set TTB 0
 51	isb
 52#endif
 53	ret	lr
 54ENDPROC(cpu_v7_switch_mm)
 55
 56#ifdef __ARMEB__
 57#define rl r3
 58#define rh r2
 59#else
 60#define rl r2
 61#define rh r3
 62#endif
 63
 64/*
 65 * cpu_v7_set_pte_ext(ptep, pte)
 66 *
 67 * Set a level 2 translation table entry.
 68 * - ptep - pointer to level 3 translation table entry
 69 * - pte - PTE value to store (64-bit in r2 and r3)
 70 */
 71ENTRY(cpu_v7_set_pte_ext)
 72#ifdef CONFIG_MMU
 73	tst	rl, #L_PTE_VALID
 74	beq	1f
 75	tst	rh, #1 << (57 - 32)		@ L_PTE_NONE
 76	bicne	rl, #L_PTE_VALID
 77	bne	1f
 78
 79	eor	ip, rh, #1 << (55 - 32)	@ toggle L_PTE_DIRTY in temp reg to
 80					@ test for !L_PTE_DIRTY || L_PTE_RDONLY
 81	tst	ip, #1 << (55 - 32) | 1 << (58 - 32)
 82	orrne	rl, #PTE_AP2
 83	biceq	rl, #PTE_AP2
 84
 851:	strd	r2, r3, [r0]
 86	ALT_SMP(W(nop))
 87	ALT_UP (mcr	p15, 0, r0, c7, c10, 1)		@ flush_pte
 88#endif
 89	ret	lr
 90ENDPROC(cpu_v7_set_pte_ext)
 91
 92	/*
 93	 * Memory region attributes for LPAE (defined in pgtable-3level.h):
 94	 *
 95	 *   n = AttrIndx[2:0]
 96	 *
 97	 *			n	MAIR
 98	 *   UNCACHED		000	00000000
 99	 *   BUFFERABLE		001	01000100
100	 *   DEV_WC		001	01000100
101	 *   WRITETHROUGH	010	10101010
102	 *   WRITEBACK		011	11101110
103	 *   DEV_CACHED		011	11101110
104	 *   DEV_SHARED		100	00000100
105	 *   DEV_NONSHARED	100	00000100
106	 *   unused		101
107	 *   unused		110
108	 *   WRITEALLOC		111	11111111
109	 */
110.equ	PRRR,	0xeeaa4400			@ MAIR0
111.equ	NMRR,	0xff000004			@ MAIR1
112
113	/*
114	 * Macro for setting up the TTBRx and TTBCR registers.
115	 * - \ttbr1 updated.
116	 */
117	.macro	v7_ttb_setup, zero, ttbr0l, ttbr0h, ttbr1, tmp
118	ldr	\tmp, =swapper_pg_dir		@ swapper_pg_dir virtual address
119	cmp	\ttbr1, \tmp, lsr #12		@ PHYS_OFFSET > PAGE_OFFSET?
120	mov	\tmp, #TTB_EAE			@ for TTB control egister
121	ALT_SMP(orr	\tmp, \tmp, #TTB_FLAGS_SMP)
122	ALT_UP(orr	\tmp, \tmp, #TTB_FLAGS_UP)
123	ALT_SMP(orr	\tmp, \tmp, #TTB_FLAGS_SMP << 16)
124	ALT_UP(orr	\tmp, \tmp, #TTB_FLAGS_UP << 16)
125	/*
126	 * Only use split TTBRs if PHYS_OFFSET <= PAGE_OFFSET (cmp above),
127	 * otherwise booting secondary CPUs would end up using TTBR1 for the
128	 * identity mapping set up in TTBR0.
129	 */
130	orrls	\tmp, \tmp, #TTBR1_SIZE				@ TTBCR.T1SZ
131	mcr	p15, 0, \tmp, c2, c0, 2				@ TTBCR
132	mov	\tmp, \ttbr1, lsr #20
133	mov	\ttbr1, \ttbr1, lsl #12
134	addls	\ttbr1, \ttbr1, #TTBR1_OFFSET
135	mcrr	p15, 1, \ttbr1, \tmp, c2			@ load TTBR1
136	.endm
137
138	/*
139	 *   AT
140	 *  TFR   EV X F   IHD LR    S
141	 * .EEE ..EE PUI. .TAT 4RVI ZWRS BLDP WCAM
142	 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
143	 *   11    0 110    0  0011 1100 .111 1101 < we want
144	 */
145	.align	2
146	.type	v7_crval, #object
147v7_crval:
148	crval	clear=0x0122c302, mmuset=0x30c03c7d, ucset=0x00c01c7c