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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2004, 2007-2010, 2011-2012, 2019-20 Synopsys, Inc. (www.synopsys.com)
*
* MMUv3 (arc700) / MMUv4 (archs) are software page walked and software managed.
* This file contains the TLB access registers and commands
*/
#ifndef _ASM_ARC_MMU_ARCV2_H
#define _ASM_ARC_MMU_ARCV2_H
/*
* TLB Management regs
*/
#define ARC_REG_MMU_BCR 0x06f
#ifdef CONFIG_ARC_MMU_V3
#define ARC_REG_TLBPD0 0x405
#define ARC_REG_TLBPD1 0x406
#define ARC_REG_TLBPD1HI 0 /* Dummy: allows common code */
#define ARC_REG_TLBINDEX 0x407
#define ARC_REG_TLBCOMMAND 0x408
#define ARC_REG_PID 0x409
#define ARC_REG_SCRATCH_DATA0 0x418
#else
#define ARC_REG_TLBPD0 0x460
#define ARC_REG_TLBPD1 0x461
#define ARC_REG_TLBPD1HI 0x463
#define ARC_REG_TLBINDEX 0x464
#define ARC_REG_TLBCOMMAND 0x465
#define ARC_REG_PID 0x468
#define ARC_REG_SCRATCH_DATA0 0x46c
#endif
/* Bits in MMU PID reg */
#define __TLB_ENABLE (1 << 31)
#define __PROG_ENABLE (1 << 30)
#define MMU_ENABLE (__TLB_ENABLE | __PROG_ENABLE)
/* Bits in TLB Index reg */
#define TLB_LKUP_ERR 0x80000000
#ifdef CONFIG_ARC_MMU_V3
#define TLB_DUP_ERR (TLB_LKUP_ERR | 0x00000001)
#else
#define TLB_DUP_ERR (TLB_LKUP_ERR | 0x40000000)
#endif
/*
* TLB Commands
*/
#define TLBWrite 0x1
#define TLBRead 0x2
#define TLBGetIndex 0x3
#define TLBProbe 0x4
#define TLBWriteNI 0x5 /* write JTLB without inv uTLBs */
#define TLBIVUTLB 0x6 /* explicitly inv uTLBs */
#ifdef CONFIG_ARC_MMU_V4
#define TLBInsertEntry 0x7
#define TLBDeleteEntry 0x8
#endif
/* Masks for actual TLB "PD"s */
#define PTE_BITS_IN_PD0 (_PAGE_GLOBAL | _PAGE_PRESENT | _PAGE_HW_SZ)
#define PTE_BITS_RWX (_PAGE_EXECUTE | _PAGE_WRITE | _PAGE_READ)
#define PTE_BITS_NON_RWX_IN_PD1 (PAGE_MASK_PHYS | _PAGE_CACHEABLE)
#ifndef __ASSEMBLY__
struct mm_struct;
extern int pae40_exist_but_not_enab(void);
static inline int is_pae40_enabled(void)
{
return IS_ENABLED(CONFIG_ARC_HAS_PAE40);
}
static inline void mmu_setup_asid(struct mm_struct *mm, unsigned long asid)
{
write_aux_reg(ARC_REG_PID, asid | MMU_ENABLE);
}
static inline void mmu_setup_pgd(struct mm_struct *mm, void *pgd)
{
/* PGD cached in MMU reg to avoid 3 mem lookups: task->mm->pgd */
#ifdef CONFIG_ISA_ARCV2
write_aux_reg(ARC_REG_SCRATCH_DATA0, (unsigned int)pgd);
#endif
}
#else
.macro ARC_MMU_REENABLE reg
lr \reg, [ARC_REG_PID]
or \reg, \reg, MMU_ENABLE
sr \reg, [ARC_REG_PID]
.endm
#endif /* !__ASSEMBLY__ */
#endif
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