arch/arm/include/asm/armv8/mmu.h

/*
 * (C) Copyright 2013
 * David Feng <fenghua@phytium.com.cn>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#ifndef _ASM_ARMV8_MMU_H_
#define _ASM_ARMV8_MMU_H_

#ifdef __ASSEMBLY__
#define _AC(X, Y)	X
#else
#define _AC(X, Y)	(X##Y)
#endif

#define UL(x)		_AC(x, UL)

/***************************************************************/
/*
 * The following definitions are related each other, shoud be
 * calculated specifically.
 */
#define VA_BITS			(42)	/* 42 bits virtual address */

/* PAGE_SHIFT determines the page size */
#undef  PAGE_SIZE
#define PAGE_SHIFT		16
#define PAGE_SIZE		(1 << PAGE_SHIFT)
#define PAGE_MASK		(~(PAGE_SIZE-1))

/*
 * section address mask and size definitions.
 */
#define SECTION_SHIFT		29
#define SECTION_SIZE		(UL(1) << SECTION_SHIFT)
#define SECTION_MASK		(~(SECTION_SIZE-1))
/***************************************************************/

/*
 * Memory types
 */
#define MT_DEVICE_NGNRNE	0
#define MT_DEVICE_NGNRE		1
#define MT_DEVICE_GRE		2
#define MT_NORMAL_NC		3
#define MT_NORMAL		4

#define MEMORY_ATTRIBUTES	((0x00 << (MT_DEVICE_NGNRNE*8)) |	\
				(0x04 << (MT_DEVICE_NGNRE*8)) |		\
				(0x0c << (MT_DEVICE_GRE*8)) |		\
				(0x44 << (MT_NORMAL_NC*8)) |		\
				(UL(0xff) << (MT_NORMAL*8)))

/*
 * Hardware page table definitions.
 *
 * Level 2 descriptor (PMD).
 */
#define PMD_TYPE_MASK		(3 << 0)
#define PMD_TYPE_FAULT		(0 << 0)
#define PMD_TYPE_TABLE		(3 << 0)
#define PMD_TYPE_SECT		(1 << 0)

/*
 * Section
 */
#define PMD_SECT_OUTER_SHARE	(2 << 8)
#define PMD_SECT_INNER_SHARE	(3 << 8)
#define PMD_SECT_AF		(1 << 10)
#define PMD_SECT_NG		(1 << 11)
#define PMD_SECT_PXN		(UL(1) << 53)
#define PMD_SECT_UXN		(UL(1) << 54)

/*
 * AttrIndx[2:0]
 */
#define PMD_ATTRINDX(t)		((t) << 2)
#define PMD_ATTRINDX_MASK	(7 << 2)

/*
 * TCR flags.
 */
#define TCR_T0SZ(x)		((64 - (x)) << 0)
#define TCR_IRGN_NC		(0 << 8)
#define TCR_IRGN_WBWA		(1 << 8)
#define TCR_IRGN_WT		(2 << 8)
#define TCR_IRGN_WBNWA		(3 << 8)
#define TCR_IRGN_MASK		(3 << 8)
#define TCR_ORGN_NC		(0 << 10)
#define TCR_ORGN_WBWA		(1 << 10)
#define TCR_ORGN_WT		(2 << 10)
#define TCR_ORGN_WBNWA		(3 << 10)
#define TCR_ORGN_MASK		(3 << 10)
#define TCR_SHARED_NON		(0 << 12)
#define TCR_SHARED_OUTER	(2 << 12)
#define TCR_SHARED_INNER	(3 << 12)
#define TCR_TG0_4K		(0 << 14)
#define TCR_TG0_64K		(1 << 14)
#define TCR_TG0_16K		(2 << 14)
#define TCR_EL1_IPS_BITS	(UL(3) << 32)	/* 42 bits physical address */
#define TCR_EL2_IPS_BITS	(3 << 16)	/* 42 bits physical address */
#define TCR_EL3_IPS_BITS	(3 << 16)	/* 42 bits physical address */

/* PTWs cacheable, inner/outer WBWA and non-shareable */
#define TCR_FLAGS		(TCR_TG0_64K |		\
				TCR_SHARED_NON |	\
				TCR_ORGN_WBWA |		\
				TCR_IRGN_WBWA |		\
				TCR_T0SZ(VA_BITS))

#ifndef __ASSEMBLY__
void set_pgtable_section(u64 *page_table, u64 index,
			 u64 section, u64 memory_type);
static inline void set_ttbr_tcr_mair(int el, u64 table, u64 tcr, u64 attr)
{
	asm volatile("dsb sy");
	if (el == 1) {
		asm volatile("msr ttbr0_el1, %0" : : "r" (table) : "memory");
		asm volatile("msr tcr_el1, %0" : : "r" (tcr) : "memory");
		asm volatile("msr mair_el1, %0" : : "r" (attr) : "memory");
	} else if (el == 2) {
		asm volatile("msr ttbr0_el2, %0" : : "r" (table) : "memory");
		asm volatile("msr tcr_el2, %0" : : "r" (tcr) : "memory");
		asm volatile("msr mair_el2, %0" : : "r" (attr) : "memory");
	} else if (el == 3) {
		asm volatile("msr ttbr0_el3, %0" : : "r" (table) : "memory");
		asm volatile("msr tcr_el3, %0" : : "r" (tcr) : "memory");
		asm volatile("msr mair_el3, %0" : : "r" (attr) : "memory");
	} else {
		hang();
	}
	asm volatile("isb");
}
#endif
#endif /* _ASM_ARMV8_MMU_H_ */