/* SPDX-License-Identifier: GPL-2.0-only */
/*
* arch/arm/mm/proc-v7-3level.S
*
* Copyright (C) 2001 Deep Blue Solutions Ltd.
* Copyright (C) 2011 ARM Ltd.
* Author: Catalin Marinas <[email protected]>
* based on arch/arm/mm/proc-v7-2level.S
*/
#include <asm/assembler.h>
#define TTB_IRGN_NC (0 << 8)
#define TTB_IRGN_WBWA (1 << 8)
#define TTB_IRGN_WT (2 << 8)
#define TTB_IRGN_WB (3 << 8)
#define TTB_RGN_NC (0 << 10)
#define TTB_RGN_OC_WBWA (1 << 10)
#define TTB_RGN_OC_WT (2 << 10)
#define TTB_RGN_OC_WB (3 << 10)
#define TTB_S (3 << 12)
#define TTB_EAE (1 << 31)
/* 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_RGN_OC_WBWA)
#define PMD_FLAGS_SMP (PMD_SECT_WBWA|PMD_SECT_S)
#ifndef __ARMEB__
# define rpgdl r0
# define rpgdh r1
#else
# define rpgdl r1
# define rpgdh r0
#endif
/*
* cpu_v7_switch_mm(pgd_phys, tsk)
*
* Set the translation table base pointer to be pgd_phys (physical address of
* the new TTB).
*/
SYM_TYPED_FUNC_START(cpu_v7_switch_mm)
#ifdef CONFIG_MMU
mmid r2, r2
asid r2, r2
orr rpgdh, rpgdh, r2, lsl #(48 - 32) @ upper 32-bits of pgd
mcrr p15, 0, rpgdl, rpgdh, c2 @ set TTB 0
isb
#endif
ret lr
SYM_FUNC_END(cpu_v7_switch_mm)
#ifdef __ARMEB__
#define rl r3
#define rh r2
#else
#define rl r2
#define rh r3
#endif
/*
* cpu_v7_set_pte_ext(ptep, pte)
*
* Set a level 2 translation table entry.
* - ptep - pointer to level 3 translation table entry
* - pte - PTE value to store (64-bit in r2 and r3)
*/
SYM_TYPED_FUNC_START(cpu_v7_set_pte_ext)
#ifdef CONFIG_MMU
tst rl, #L_PTE_VALID
beq 1f
tst rh, #1 << (57 - 32) @ L_PTE_NONE
bicne rl, #L_PTE_VALID
bne 1f
eor ip, rh, #1 << (55 - 32) @ toggle L_PTE_DIRTY in temp reg to
@ test for !L_PTE_DIRTY || L_PTE_RDONLY
tst ip, #1 << (55 - 32) | 1 << (58 - 32)
orrne rl, #PTE_AP2
biceq rl, #PTE_AP2
1: strd r2, r3, [r0]
ALT_SMP(W(nop))
ALT_UP (mcr p15, 0, r0, c7, c10, 1) @ flush_pte
#endif
ret lr
SYM_FUNC_END(cpu_v7_set_pte_ext)
/*
* Memory region attributes for LPAE (defined in pgtable-3level.h):
*
* n = AttrIndx[2:0]
*
* n MAIR
* UNCACHED 000 00000000
* BUFFERABLE 001 01000100
* DEV_WC 001 01000100
* WRITETHROUGH 010 10101010
* WRITEBACK 011 11101110
* DEV_CACHED 011 11101110
* DEV_SHARED 100 00000100
* DEV_NONSHARED 100 00000100
* unused 101
* unused 110
* WRITEALLOC 111 11111111
*/
.equ PRRR, 0xeeaa4400 @ MAIR0
.equ NMRR, 0xff000004 @ MAIR1
/*
* Macro for setting up the TTBRx and TTBCR registers.
* - \ttbr1 updated.
*/
.macro v7_ttb_setup, zero, ttbr0l, ttbr0h, ttbr1, tmp
ldr \tmp, =swapper_pg_dir @ swapper_pg_dir virtual address
cmp \ttbr1, \tmp, lsr #12 @ PHYS_OFFSET > PAGE_OFFSET?
mov \tmp, #TTB_EAE @ for TTB control egister
ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP)
ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP)
ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP << 16)
ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP << 16)
/*
* Only use split TTBRs if PHYS_OFFSET <= PAGE_OFFSET (cmp above),
* otherwise booting secondary CPUs would end up using TTBR1 for the
* identity mapping set up in TTBR0.
*/
orrls \tmp, \tmp, #TTBR1_SIZE @ TTBCR.T1SZ
mcr p15, 0, \tmp, c2, c0, 2 @ TTBCR
mov \tmp, \ttbr1, lsr #20
mov \ttbr1, \ttbr1, lsl #12
addls \ttbr1, \ttbr1, #TTBR1_OFFSET
mcrr p15, 1, \ttbr1, \tmp, c2 @ load TTBR1
.endm
/*
* AT
* TFR EV X F IHD LR S
* .EEE ..EE PUI. .TAT 4RVI ZWRS BLDP WCAM
* rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
* 11 0 110 0 0011 1100 .111 1101 < we want
*/
.align 2
.type v7_crval, #object
v7_crval:
crval clear=0x0122c302, mmuset=0x30c03c7d, ucset=0x00c01c7c
Codebase Browser
linux