lib/xlat_tables_v2/aarch64/xlat_tables_arch.c - tf-a-mtk - Git at Google

 /*
  * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 #include <assert.h>
 #include <stdbool.h>
 #include <stdint.h>

 #include <arch.h>
 #include <arch_features.h>
 #include <arch_helpers.h>
 #include <lib/cassert.h>
 #include <lib/utils_def.h>
 #include <lib/xlat_tables/xlat_tables_v2.h>

 #include "../xlat_tables_private.h"

 /*
  * Returns true if the provided granule size is supported, false otherwise.
  */
 bool xlat_arch_is_granule_size_supported(size_t size)
 {
 	u_register_t id_aa64mmfr0_el1 = read_id_aa64mmfr0_el1();

 	if (size == PAGE_SIZE_4KB) {
 		return ((id_aa64mmfr0_el1 >> ID_AA64MMFR0_EL1_TGRAN4_SHIFT) &
 			 ID_AA64MMFR0_EL1_TGRAN4_MASK) ==
 			 ID_AA64MMFR0_EL1_TGRAN4_SUPPORTED;
 	} else if (size == PAGE_SIZE_16KB) {
 		return ((id_aa64mmfr0_el1 >> ID_AA64MMFR0_EL1_TGRAN16_SHIFT) &
 			 ID_AA64MMFR0_EL1_TGRAN16_MASK) ==
 			 ID_AA64MMFR0_EL1_TGRAN16_SUPPORTED;
 	} else if (size == PAGE_SIZE_64KB) {
 		return ((id_aa64mmfr0_el1 >> ID_AA64MMFR0_EL1_TGRAN64_SHIFT) &
 			 ID_AA64MMFR0_EL1_TGRAN64_MASK) ==
 			 ID_AA64MMFR0_EL1_TGRAN64_SUPPORTED;
 	} else {
 		return 0;
 	}
 }

 size_t xlat_arch_get_max_supported_granule_size(void)
 {
 	if (xlat_arch_is_granule_size_supported(PAGE_SIZE_64KB)) {
 		return PAGE_SIZE_64KB;
 	} else if (xlat_arch_is_granule_size_supported(PAGE_SIZE_16KB)) {
 		return PAGE_SIZE_16KB;
 	} else {
 		assert(xlat_arch_is_granule_size_supported(PAGE_SIZE_4KB));
 		return PAGE_SIZE_4KB;
 	}
 }

 unsigned long long tcr_physical_addr_size_bits(unsigned long long max_addr)
 {
 	/* Physical address can't exceed 48 bits */
 	assert((max_addr & ADDR_MASK_48_TO_63) == 0U);

 	/* 48 bits address */
 	if ((max_addr & ADDR_MASK_44_TO_47) != 0U)
 		return TCR_PS_BITS_256TB;

 	/* 44 bits address */
 	if ((max_addr & ADDR_MASK_42_TO_43) != 0U)
 		return TCR_PS_BITS_16TB;

 	/* 42 bits address */
 	if ((max_addr & ADDR_MASK_40_TO_41) != 0U)
 		return TCR_PS_BITS_4TB;

 	/* 40 bits address */
 	if ((max_addr & ADDR_MASK_36_TO_39) != 0U)
 		return TCR_PS_BITS_1TB;

 	/* 36 bits address */
 	if ((max_addr & ADDR_MASK_32_TO_35) != 0U)
 		return TCR_PS_BITS_64GB;

 	return TCR_PS_BITS_4GB;
 }

 #if ENABLE_ASSERTIONS
 /*
  * Physical Address ranges supported in the AArch64 Memory Model. Value 0b110 is
  * supported in ARMv8.2 onwards.
  */
 static const unsigned int pa_range_bits_arr[] = {
 	PARANGE_0000, PARANGE_0001, PARANGE_0010, PARANGE_0011, PARANGE_0100,
 	PARANGE_0101, PARANGE_0110
 };

 unsigned long long xlat_arch_get_max_supported_pa(void)
 {
 	u_register_t pa_range = read_id_aa64mmfr0_el1() &
 						ID_AA64MMFR0_EL1_PARANGE_MASK;

 	/* All other values are reserved */
 	assert(pa_range < ARRAY_SIZE(pa_range_bits_arr));

 	return (1ULL << pa_range_bits_arr[pa_range]) - 1ULL;
 }

 /*
  * Return minimum virtual address space size supported by the architecture
  */
 uintptr_t xlat_get_min_virt_addr_space_size(void)
 {
 	uintptr_t ret;

 	if (is_armv8_4_ttst_present())
 		ret = MIN_VIRT_ADDR_SPACE_SIZE_TTST;
 	else
 		ret = MIN_VIRT_ADDR_SPACE_SIZE;

 	return ret;
 }
 #endif /* ENABLE_ASSERTIONS*/

 bool is_mmu_enabled_ctx(const xlat_ctx_t *ctx)
 {
 	if (ctx->xlat_regime == EL1_EL0_REGIME) {
 		assert(xlat_arch_current_el() >= 1U);
 		return (read_sctlr_el1() & SCTLR_M_BIT) != 0U;
 	} else if (ctx->xlat_regime == EL2_REGIME) {
 		assert(xlat_arch_current_el() >= 2U);
 		return (read_sctlr_el2() & SCTLR_M_BIT) != 0U;
 	} else {
 		assert(ctx->xlat_regime == EL3_REGIME);
 		assert(xlat_arch_current_el() >= 3U);
 		return (read_sctlr_el3() & SCTLR_M_BIT) != 0U;
 	}
 }

 bool is_dcache_enabled(void)
 {
 	unsigned int el = (unsigned int)GET_EL(read_CurrentEl());

 	if (el == 1U) {
 		return (read_sctlr_el1() & SCTLR_C_BIT) != 0U;
 	} else if (el == 2U) {
 		return (read_sctlr_el2() & SCTLR_C_BIT) != 0U;
 	} else {
 		return (read_sctlr_el3() & SCTLR_C_BIT) != 0U;
 	}
 }

 uint64_t xlat_arch_regime_get_xn_desc(int xlat_regime)
 {
 	if (xlat_regime == EL1_EL0_REGIME) {
 		return UPPER_ATTRS(UXN) | UPPER_ATTRS(PXN);
 	} else {
 		assert((xlat_regime == EL2_REGIME) ||
 		       (xlat_regime == EL3_REGIME));
 		return UPPER_ATTRS(XN);
 	}
 }

 void xlat_arch_tlbi_va(uintptr_t va, int xlat_regime)
 {
 	/*
 	 * Ensure the translation table write has drained into memory before
 	 * invalidating the TLB entry.
 	 */
 	dsbishst();

 	/*
 	 * This function only supports invalidation of TLB entries for the EL3
 	 * and EL1&0 translation regimes.
 	 *
 	 * Also, it is architecturally UNDEFINED to invalidate TLBs of a higher
 	 * exception level (see section D4.9.2 of the ARM ARM rev B.a).
 	 */
 	if (xlat_regime == EL1_EL0_REGIME) {
 		assert(xlat_arch_current_el() >= 1U);
 		tlbivaae1is(TLBI_ADDR(va));
 	} else if (xlat_regime == EL2_REGIME) {
 		assert(xlat_arch_current_el() >= 2U);
 		tlbivae2is(TLBI_ADDR(va));
 	} else {
 		assert(xlat_regime == EL3_REGIME);
 		assert(xlat_arch_current_el() >= 3U);
 		tlbivae3is(TLBI_ADDR(va));
 	}
 }

 void xlat_arch_tlbi_va_sync(void)
 {
 	/*
 	 * A TLB maintenance instruction can complete at any time after
 	 * it is issued, but is only guaranteed to be complete after the
 	 * execution of DSB by the PE that executed the TLB maintenance
 	 * instruction. After the TLB invalidate instruction is
 	 * complete, no new memory accesses using the invalidated TLB
 	 * entries will be observed by any observer of the system
 	 * domain. See section D4.8.2 of the ARMv8 (issue k), paragraph
 	 * "Ordering and completion of TLB maintenance instructions".
 	 */
 	dsbish();

 	/*
 	 * The effects of a completed TLB maintenance instruction are
 	 * only guaranteed to be visible on the PE that executed the
 	 * instruction after the execution of an ISB instruction by the
 	 * PE that executed the TLB maintenance instruction.
 	 */
 	isb();
 }

 unsigned int xlat_arch_current_el(void)
 {
 	unsigned int el = (unsigned int)GET_EL(read_CurrentEl());

 	assert(el > 0U);

 	return el;
 }

 void setup_mmu_cfg(uint64_t *params, unsigned int flags,
 		   const uint64_t *base_table, unsigned long long max_pa,
 		   uintptr_t max_va, int xlat_regime)
 {
 	uint64_t mair, ttbr0, tcr;
 	uintptr_t virtual_addr_space_size;

 	/* Set attributes in the right indices of the MAIR. */
 	mair = MAIR_ATTR_SET(ATTR_DEVICE, ATTR_DEVICE_INDEX);
 	mair |= MAIR_ATTR_SET(ATTR_IWBWA_OWBWA_NTR, ATTR_IWBWA_OWBWA_NTR_INDEX);
 	mair |= MAIR_ATTR_SET(ATTR_NON_CACHEABLE, ATTR_NON_CACHEABLE_INDEX);

 	/*
 	 * Limit the input address ranges and memory region sizes translated
 	 * using TTBR0 to the given virtual address space size.
 	 */
 	assert(max_va < ((uint64_t)UINTPTR_MAX));

 	virtual_addr_space_size = (uintptr_t)max_va + 1U;

 	assert(virtual_addr_space_size >=
 		xlat_get_min_virt_addr_space_size());
 	assert(virtual_addr_space_size <= MAX_VIRT_ADDR_SPACE_SIZE);
 	assert(IS_POWER_OF_TWO(virtual_addr_space_size));

 	/*
 	 * __builtin_ctzll(0) is undefined but here we are guaranteed that
 	 * virtual_addr_space_size is in the range [1,UINTPTR_MAX].
 	 */
 	int t0sz = 64 - __builtin_ctzll(virtual_addr_space_size);

 	tcr = (uint64_t)t0sz << TCR_T0SZ_SHIFT;

 	/*
 	 * Set the cacheability and shareability attributes for memory
 	 * associated with translation table walks.
 	 */
 	if ((flags & XLAT_TABLE_NC) != 0U) {
 		/* Inner & outer non-cacheable non-shareable. */
 		tcr |= TCR_SH_NON_SHAREABLE |
 			TCR_RGN_OUTER_NC | TCR_RGN_INNER_NC;
 	} else {
 		/* Inner & outer WBWA & shareable. */
 		tcr |= TCR_SH_INNER_SHAREABLE |
 			TCR_RGN_OUTER_WBA | TCR_RGN_INNER_WBA;
 	}

 	/*
 	 * It is safer to restrict the max physical address accessible by the
 	 * hardware as much as possible.
 	 */
 	unsigned long long tcr_ps_bits = tcr_physical_addr_size_bits(max_pa);

 	if (xlat_regime == EL1_EL0_REGIME) {
 		/*
 		 * TCR_EL1.EPD1: Disable translation table walk for addresses
 		 * that are translated using TTBR1_EL1.
 		 */
 		tcr |= TCR_EPD1_BIT | (tcr_ps_bits << TCR_EL1_IPS_SHIFT);
 	} else if (xlat_regime == EL2_REGIME) {
 		tcr |= TCR_EL2_RES1 | (tcr_ps_bits << TCR_EL2_PS_SHIFT);
 	} else {
 		assert(xlat_regime == EL3_REGIME);
 		tcr |= TCR_EL3_RES1 | (tcr_ps_bits << TCR_EL3_PS_SHIFT);
 	}

 	/* Set TTBR bits as well */
 	ttbr0 = (uint64_t) base_table;

 	if (is_armv8_2_ttcnp_present()) {
 		/* Enable CnP bit so as to share page tables with all PEs. */
 		ttbr0 |= TTBR_CNP_BIT;
 	}

 	params[MMU_CFG_MAIR] = mair;
 	params[MMU_CFG_TCR] = tcr;
 	params[MMU_CFG_TTBR0] = ttbr0;
 }
	/*
	* Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	#include <assert.h>
	#include <stdbool.h>
	#include <stdint.h>

	#include <arch.h>
	#include <arch_features.h>
	#include <arch_helpers.h>
	#include <lib/cassert.h>
	#include <lib/utils_def.h>
	#include <lib/xlat_tables/xlat_tables_v2.h>

	#include "../xlat_tables_private.h"

	/*
	* Returns true if the provided granule size is supported, false otherwise.
	*/
	bool xlat_arch_is_granule_size_supported(size_t size)
	{
	u_register_t id_aa64mmfr0_el1 = read_id_aa64mmfr0_el1();

	if (size == PAGE_SIZE_4KB) {
	return ((id_aa64mmfr0_el1 >> ID_AA64MMFR0_EL1_TGRAN4_SHIFT) &
	ID_AA64MMFR0_EL1_TGRAN4_MASK) ==
	ID_AA64MMFR0_EL1_TGRAN4_SUPPORTED;
	} else if (size == PAGE_SIZE_16KB) {
	return ((id_aa64mmfr0_el1 >> ID_AA64MMFR0_EL1_TGRAN16_SHIFT) &
	ID_AA64MMFR0_EL1_TGRAN16_MASK) ==
	ID_AA64MMFR0_EL1_TGRAN16_SUPPORTED;
	} else if (size == PAGE_SIZE_64KB) {
	return ((id_aa64mmfr0_el1 >> ID_AA64MMFR0_EL1_TGRAN64_SHIFT) &
	ID_AA64MMFR0_EL1_TGRAN64_MASK) ==
	ID_AA64MMFR0_EL1_TGRAN64_SUPPORTED;
	} else {
	return 0;
	}
	}

	size_t xlat_arch_get_max_supported_granule_size(void)
	{
	if (xlat_arch_is_granule_size_supported(PAGE_SIZE_64KB)) {
	return PAGE_SIZE_64KB;
	} else if (xlat_arch_is_granule_size_supported(PAGE_SIZE_16KB)) {
	return PAGE_SIZE_16KB;
	} else {
	assert(xlat_arch_is_granule_size_supported(PAGE_SIZE_4KB));
	return PAGE_SIZE_4KB;
	}
	}

	unsigned long long tcr_physical_addr_size_bits(unsigned long long max_addr)
	{
	/* Physical address can't exceed 48 bits */
	assert((max_addr & ADDR_MASK_48_TO_63) == 0U);

	/* 48 bits address */
	if ((max_addr & ADDR_MASK_44_TO_47) != 0U)
	return TCR_PS_BITS_256TB;

	/* 44 bits address */
	if ((max_addr & ADDR_MASK_42_TO_43) != 0U)
	return TCR_PS_BITS_16TB;

	/* 42 bits address */
	if ((max_addr & ADDR_MASK_40_TO_41) != 0U)
	return TCR_PS_BITS_4TB;

	/* 40 bits address */
	if ((max_addr & ADDR_MASK_36_TO_39) != 0U)
	return TCR_PS_BITS_1TB;

	/* 36 bits address */
	if ((max_addr & ADDR_MASK_32_TO_35) != 0U)
	return TCR_PS_BITS_64GB;

	return TCR_PS_BITS_4GB;
	}

	#if ENABLE_ASSERTIONS
	/*
	* Physical Address ranges supported in the AArch64 Memory Model. Value 0b110 is
	* supported in ARMv8.2 onwards.
	*/
	static const unsigned int pa_range_bits_arr[] = {
	PARANGE_0000, PARANGE_0001, PARANGE_0010, PARANGE_0011, PARANGE_0100,
	PARANGE_0101, PARANGE_0110
	};

	unsigned long long xlat_arch_get_max_supported_pa(void)
	{
	u_register_t pa_range = read_id_aa64mmfr0_el1() &
	ID_AA64MMFR0_EL1_PARANGE_MASK;

	/* All other values are reserved */
	assert(pa_range < ARRAY_SIZE(pa_range_bits_arr));

	return (1ULL << pa_range_bits_arr[pa_range]) - 1ULL;
	}

	/*
	* Return minimum virtual address space size supported by the architecture
	*/
	uintptr_t xlat_get_min_virt_addr_space_size(void)
	{
	uintptr_t ret;

	if (is_armv8_4_ttst_present())
	ret = MIN_VIRT_ADDR_SPACE_SIZE_TTST;
	else
	ret = MIN_VIRT_ADDR_SPACE_SIZE;

	return ret;
	}
	#endif /* ENABLE_ASSERTIONS*/

	bool is_mmu_enabled_ctx(const xlat_ctx_t *ctx)
	{
	if (ctx->xlat_regime == EL1_EL0_REGIME) {
	assert(xlat_arch_current_el() >= 1U);
	return (read_sctlr_el1() & SCTLR_M_BIT) != 0U;
	} else if (ctx->xlat_regime == EL2_REGIME) {
	assert(xlat_arch_current_el() >= 2U);
	return (read_sctlr_el2() & SCTLR_M_BIT) != 0U;
	} else {
	assert(ctx->xlat_regime == EL3_REGIME);
	assert(xlat_arch_current_el() >= 3U);
	return (read_sctlr_el3() & SCTLR_M_BIT) != 0U;
	}
	}

	bool is_dcache_enabled(void)
	{
	unsigned int el = (unsigned int)GET_EL(read_CurrentEl());

	if (el == 1U) {
	return (read_sctlr_el1() & SCTLR_C_BIT) != 0U;
	} else if (el == 2U) {
	return (read_sctlr_el2() & SCTLR_C_BIT) != 0U;
	} else {
	return (read_sctlr_el3() & SCTLR_C_BIT) != 0U;
	}
	}

	uint64_t xlat_arch_regime_get_xn_desc(int xlat_regime)
	{
	if (xlat_regime == EL1_EL0_REGIME) {
	return UPPER_ATTRS(UXN) \| UPPER_ATTRS(PXN);
	} else {
	assert((xlat_regime == EL2_REGIME) \|\|
	(xlat_regime == EL3_REGIME));
	return UPPER_ATTRS(XN);
	}
	}

	void xlat_arch_tlbi_va(uintptr_t va, int xlat_regime)
	{
	/*
	* Ensure the translation table write has drained into memory before
	* invalidating the TLB entry.
	*/
	dsbishst();

	/*
	* This function only supports invalidation of TLB entries for the EL3
	* and EL1&0 translation regimes.
	*
	* Also, it is architecturally UNDEFINED to invalidate TLBs of a higher
	* exception level (see section D4.9.2 of the ARM ARM rev B.a).
	*/
	if (xlat_regime == EL1_EL0_REGIME) {
	assert(xlat_arch_current_el() >= 1U);
	tlbivaae1is(TLBI_ADDR(va));
	} else if (xlat_regime == EL2_REGIME) {
	assert(xlat_arch_current_el() >= 2U);
	tlbivae2is(TLBI_ADDR(va));
	} else {
	assert(xlat_regime == EL3_REGIME);
	assert(xlat_arch_current_el() >= 3U);
	tlbivae3is(TLBI_ADDR(va));
	}
	}

	void xlat_arch_tlbi_va_sync(void)
	{
	/*
	* A TLB maintenance instruction can complete at any time after
	* it is issued, but is only guaranteed to be complete after the
	* execution of DSB by the PE that executed the TLB maintenance
	* instruction. After the TLB invalidate instruction is
	* complete, no new memory accesses using the invalidated TLB
	* entries will be observed by any observer of the system
	* domain. See section D4.8.2 of the ARMv8 (issue k), paragraph
	* "Ordering and completion of TLB maintenance instructions".
	*/
	dsbish();

	/*
	* The effects of a completed TLB maintenance instruction are
	* only guaranteed to be visible on the PE that executed the
	* instruction after the execution of an ISB instruction by the
	* PE that executed the TLB maintenance instruction.
	*/
	isb();
	}

	unsigned int xlat_arch_current_el(void)
	{
	unsigned int el = (unsigned int)GET_EL(read_CurrentEl());

	assert(el > 0U);

	return el;
	}

	void setup_mmu_cfg(uint64_t *params, unsigned int flags,
	const uint64_t *base_table, unsigned long long max_pa,
	uintptr_t max_va, int xlat_regime)
	{
	uint64_t mair, ttbr0, tcr;
	uintptr_t virtual_addr_space_size;

	/* Set attributes in the right indices of the MAIR. */
	mair = MAIR_ATTR_SET(ATTR_DEVICE, ATTR_DEVICE_INDEX);
	mair \|= MAIR_ATTR_SET(ATTR_IWBWA_OWBWA_NTR, ATTR_IWBWA_OWBWA_NTR_INDEX);
	mair \|= MAIR_ATTR_SET(ATTR_NON_CACHEABLE, ATTR_NON_CACHEABLE_INDEX);

	/*
	* Limit the input address ranges and memory region sizes translated
	* using TTBR0 to the given virtual address space size.
	*/
	assert(max_va < ((uint64_t)UINTPTR_MAX));

	virtual_addr_space_size = (uintptr_t)max_va + 1U;

	assert(virtual_addr_space_size >=
	xlat_get_min_virt_addr_space_size());
	assert(virtual_addr_space_size <= MAX_VIRT_ADDR_SPACE_SIZE);
	assert(IS_POWER_OF_TWO(virtual_addr_space_size));

	/*
	* __builtin_ctzll(0) is undefined but here we are guaranteed that
	* virtual_addr_space_size is in the range [1,UINTPTR_MAX].
	*/
	int t0sz = 64 - __builtin_ctzll(virtual_addr_space_size);

	tcr = (uint64_t)t0sz << TCR_T0SZ_SHIFT;

	/*
	* Set the cacheability and shareability attributes for memory
	* associated with translation table walks.
	*/
	if ((flags & XLAT_TABLE_NC) != 0U) {
	/* Inner & outer non-cacheable non-shareable. */
	tcr \|= TCR_SH_NON_SHAREABLE \|
	TCR_RGN_OUTER_NC \| TCR_RGN_INNER_NC;
	} else {
	/* Inner & outer WBWA & shareable. */
	tcr \|= TCR_SH_INNER_SHAREABLE \|
	TCR_RGN_OUTER_WBA \| TCR_RGN_INNER_WBA;
	}

	/*
	* It is safer to restrict the max physical address accessible by the
	* hardware as much as possible.
	*/
	unsigned long long tcr_ps_bits = tcr_physical_addr_size_bits(max_pa);

	if (xlat_regime == EL1_EL0_REGIME) {
	/*
	* TCR_EL1.EPD1: Disable translation table walk for addresses
	* that are translated using TTBR1_EL1.
	*/
	tcr \|= TCR_EPD1_BIT \| (tcr_ps_bits << TCR_EL1_IPS_SHIFT);
	} else if (xlat_regime == EL2_REGIME) {
	tcr \|= TCR_EL2_RES1 \| (tcr_ps_bits << TCR_EL2_PS_SHIFT);
	} else {
	assert(xlat_regime == EL3_REGIME);
	tcr \|= TCR_EL3_RES1 \| (tcr_ps_bits << TCR_EL3_PS_SHIFT);
	}

	/* Set TTBR bits as well */
	ttbr0 = (uint64_t) base_table;

	if (is_armv8_2_ttcnp_present()) {
	/* Enable CnP bit so as to share page tables with all PEs. */
	ttbr0 \|= TTBR_CNP_BIT;
	}

	params[MMU_CFG_MAIR] = mair;
	params[MMU_CFG_TCR] = tcr;
	params[MMU_CFG_TTBR0] = ttbr0;
	}