diff options
Diffstat (limited to 'lib/xlat_mpu')
| -rw-r--r-- | lib/xlat_mpu/aarch64/enable_mpu.S | 53 | ||||
| -rw-r--r-- | lib/xlat_mpu/aarch64/xlat_mpu_arch.c | 69 | ||||
| -rw-r--r-- | lib/xlat_mpu/ro_xlat_mpu.mk | 14 | ||||
| -rw-r--r-- | lib/xlat_mpu/xlat_mpu.mk | 19 | ||||
| -rw-r--r-- | lib/xlat_mpu/xlat_mpu_context.c | 65 | ||||
| -rw-r--r-- | lib/xlat_mpu/xlat_mpu_core.c | 408 | ||||
| -rw-r--r-- | lib/xlat_mpu/xlat_mpu_private.h | 103 | ||||
| -rw-r--r-- | lib/xlat_mpu/xlat_mpu_utils.c | 83 |
8 files changed, 814 insertions, 0 deletions
diff --git a/lib/xlat_mpu/aarch64/enable_mpu.S b/lib/xlat_mpu/aarch64/enable_mpu.S new file mode 100644 index 0000000..0dda979 --- /dev/null +++ b/lib/xlat_mpu/aarch64/enable_mpu.S @@ -0,0 +1,53 @@ +/* + * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <asm_macros.S> +#include <assert_macros.S> +#include <lib/xlat_tables/xlat_tables_v2.h> +#include <platform_def.h> + + .global enable_mpu_direct_el2 + + /* void enable_mmu_direct_el2(unsigned int flags) */ +func enable_mpu_direct_el2 +#if ENABLE_ASSERTIONS + mrs x1, sctlr_el2 + tst x1, #SCTLR_M_BIT + ASM_ASSERT(eq) +#endif + mov x7, x0 + adrp x0, mmu_cfg_params + add x0, x0, :lo12:mmu_cfg_params + + /* (MAIRs are already set up) */ + + /* TCR */ + ldr x2, [x0, #(MMU_CFG_TCR << 3)] + msr tcr_el2, x2 + + /* + * Ensure all translation table writes have drained into memory, the TLB + * invalidation is complete, and translation register writes are + * committed before enabling the MMU + */ + dsb ish + isb + + /* Set and clear required fields of SCTLR */ + mrs x4, sctlr_el2 + mov_imm x5, SCTLR_WXN_BIT | SCTLR_C_BIT | SCTLR_M_BIT + orr x4, x4, x5 + + /* Additionally, amend SCTLR fields based on flags */ + bic x5, x4, #SCTLR_C_BIT + tst x7, #DISABLE_DCACHE + csel x4, x5, x4, ne + + msr sctlr_el2, x4 + isb + + ret +endfunc enable_mpu_direct_el2 diff --git a/lib/xlat_mpu/aarch64/xlat_mpu_arch.c b/lib/xlat_mpu/aarch64/xlat_mpu_arch.c new file mode 100644 index 0000000..5a2120b --- /dev/null +++ b/lib/xlat_mpu/aarch64/xlat_mpu_arch.c @@ -0,0 +1,69 @@ +/* + * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> +#include <stdbool.h> +#include <stdint.h> + +#include "../xlat_mpu_private.h" +#include <arch.h> +#include <arch_features.h> +#include <lib/cassert.h> +#include <lib/utils_def.h> +#include <lib/xlat_tables/xlat_tables_v2.h> + +#include <fvp_r_arch_helpers.h> + +#warning "xlat_mpu library is currently experimental and its API may change in future." + +#if ENABLE_ASSERTIONS +/* + * 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_mpu_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 { + assert(xlat_arch_current_el() >= 2U); + return (read_sctlr_el2() & SCTLR_M_BIT) != 0U; + } +} + +bool is_dcache_enabled(void) +{ + unsigned int el = get_current_el(); + + if (el == 1U) { + return (read_sctlr_el1() & SCTLR_C_BIT) != 0U; + } else { /* must be EL2 */ + return (read_sctlr_el2() & SCTLR_C_BIT) != 0U; + } +} + +unsigned int xlat_arch_current_el(void) +{ + unsigned int el = (unsigned int)GET_EL(read_CurrentEl()); + + assert(el > 0U); + + return el; +} + diff --git a/lib/xlat_mpu/ro_xlat_mpu.mk b/lib/xlat_mpu/ro_xlat_mpu.mk new file mode 100644 index 0000000..d3af3bd --- /dev/null +++ b/lib/xlat_mpu/ro_xlat_mpu.mk @@ -0,0 +1,14 @@ +# +# Copyright (c) 2021, Arm Limited. All rights reserved. +# +# SPDX-License-Identifier: BSD-3-Clause +# + +ifeq (${USE_DEBUGFS}, 1) + $(error "Debugfs requires functionality from the dynamic translation \ + library and is incompatible with ALLOW_RO_XLAT_TABLES.") +endif + +ifeq (${ARCH},aarch32) + $(error "The xlat_mpu library does not currently support AArch32.") +endif diff --git a/lib/xlat_mpu/xlat_mpu.mk b/lib/xlat_mpu/xlat_mpu.mk new file mode 100644 index 0000000..31bef04 --- /dev/null +++ b/lib/xlat_mpu/xlat_mpu.mk @@ -0,0 +1,19 @@ +# +# Copyright (c) 2021, Arm Limited and Contributors. All rights reserved. +# +# SPDX-License-Identifier: BSD-3-Clause +# + +XLAT_MPU_LIB_V1_SRCS := $(addprefix lib/xlat_mpu/, \ + ${ARCH}/enable_mpu.S \ + ${ARCH}/xlat_mpu_arch.c \ + xlat_mpu_context.c \ + xlat_mpu_core.c \ + xlat_mpu_utils.c) + +XLAT_MPU_LIB_V1 := 1 +$(eval $(call add_define,XLAT_MPU_LIB_V1)) + +ifeq (${ALLOW_XLAT_MPU}, 1) + include lib/xlat_mpu_v2/ro_xlat_mpu.mk +endif diff --git a/lib/xlat_mpu/xlat_mpu_context.c b/lib/xlat_mpu/xlat_mpu_context.c new file mode 100644 index 0000000..783f21d --- /dev/null +++ b/lib/xlat_mpu/xlat_mpu_context.c @@ -0,0 +1,65 @@ +/* + * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> + +#include <common/debug.h> + +#include "lib/xlat_mpu/xlat_mpu.h" +#include <lib/xlat_tables/xlat_tables_defs.h> +#include <lib/xlat_tables/xlat_tables_v2.h> +#include "xlat_mpu_private.h" + +#include <fvp_r_arch_helpers.h> +#include <platform_def.h> + +#warning "xlat_mpu library is currently experimental and its API may change in future." + + +/* + * MMU configuration register values for the active translation context. Used + * from the MMU assembly helpers. + */ +uint64_t mmu_cfg_params[MMU_CFG_PARAM_MAX]; + +/* + * Allocate and initialise the default translation context for the BL image + * currently executing. + */ +REGISTER_XLAT_CONTEXT(tf, MAX_MMAP_REGIONS, MAX_XLAT_TABLES, + PLAT_VIRT_ADDR_SPACE_SIZE, PLAT_PHY_ADDR_SPACE_SIZE); + +void mmap_add(const mmap_region_t *mm) +{ + mmap_add_ctx(&tf_xlat_ctx, mm); +} + +void __init init_xlat_tables(void) +{ + assert(tf_xlat_ctx.xlat_regime == EL_REGIME_INVALID); + + unsigned int current_el = xlat_arch_current_el(); + + if (current_el == 1U) { + tf_xlat_ctx.xlat_regime = EL1_EL0_REGIME; + } else { + assert(current_el == 2U); + tf_xlat_ctx.xlat_regime = EL2_REGIME; + } + /* Note: If EL3 is supported in future v8-R64, add EL3 assignment */ + init_xlat_tables_ctx(&tf_xlat_ctx); +} + +int xlat_get_mem_attributes(uintptr_t base_va, uint32_t *attr) +{ + return xlat_get_mem_attributes_ctx(&tf_xlat_ctx, base_va, attr); +} + +void enable_mpu_el2(unsigned int flags) +{ + /* EL2 is strictly MPU on v8-R64, so no need for setup_mpu_cfg() */ + enable_mpu_direct_el2(flags); +} diff --git a/lib/xlat_mpu/xlat_mpu_core.c b/lib/xlat_mpu/xlat_mpu_core.c new file mode 100644 index 0000000..33f381d --- /dev/null +++ b/lib/xlat_mpu/xlat_mpu_core.c @@ -0,0 +1,408 @@ +/* + * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> +#include <errno.h> +#include <stdbool.h> +#include <stdint.h> +#include <string.h> + +#include <arch_features.h> +#include <common/debug.h> +#include <lib/utils_def.h> +#include <lib/xlat_tables/xlat_tables_defs.h> +#include <lib/xlat_tables/xlat_tables_v2.h> +#include "xlat_mpu_private.h" + +#include <fvp_r_arch_helpers.h> +#include <platform_def.h> + +#warning "xlat_mpu library is currently experimental and its API may change in future." + + +/* Helper function that cleans the data cache only if it is enabled. */ +static inline __attribute__((unused)) + void xlat_clean_dcache_range(uintptr_t addr, size_t size) +{ + if (is_dcache_enabled()) { + clean_dcache_range(addr, size); + } +} + + + +/* Calculate region-attributes byte for PRBAR part of MPU-region descriptor: */ +uint64_t prbar_attr_value(uint32_t attr) +{ + uint64_t retValue = UL(0); + uint64_t extract; /* temp var holding bit extracted from attr */ + + /* Extract and stuff SH: */ + extract = (uint64_t) ((attr >> MT_SHAREABILITY_SHIFT) + & MT_SHAREABILITY_MASK); + retValue |= (extract << PRBAR_SH_SHIFT); + + /* Extract and stuff AP: */ + extract = (uint64_t) ((attr >> MT_PERM_SHIFT) & MT_PERM_MASK); + if (extract == 0U) { + retValue |= (UL(2) << PRBAR_AP_SHIFT); + } else /* extract == 1 */ { + retValue |= (UL(0) << PRBAR_AP_SHIFT); + } + + /* Extract and stuff XN: */ + extract = (uint64_t) ((attr >> MT_EXECUTE_SHIFT) & MT_EXECUTE_MASK); + retValue |= (extract << PRBAR_XN_SHIFT); + /* However, also don't execute in peripheral space: */ + extract = (uint64_t) ((attr >> MT_TYPE_SHIFT) & MT_TYPE_MASK); + if (extract == 0U) { + retValue |= (UL(1) << PRBAR_XN_SHIFT); + } + return retValue; +} + +/* Calculate region-attributes byte for PRLAR part of MPU-region descriptor: */ +uint64_t prlar_attr_value(uint32_t attr) +{ + uint64_t retValue = UL(0); + uint64_t extract; /* temp var holding bit extracted from attr */ + + /* Extract and stuff AttrIndx: */ + extract = (uint64_t) ((attr >> MT_TYPE_SHIFT) + & MT_TYPE_MASK); + switch (extract) { + case UL(0): + retValue |= (UL(1) << PRLAR_ATTR_SHIFT); + break; + case UL(2): + /* 0, so OR in nothing */ + break; + case UL(3): + retValue |= (UL(2) << PRLAR_ATTR_SHIFT); + break; + default: + retValue |= (extract << PRLAR_ATTR_SHIFT); + break; + } + + /* Stuff EN: */ + retValue |= (UL(1) << PRLAR_EN_SHIFT); + + /* Force NS to 0 (Secure); v8-R64 only supports Secure: */ + extract = ~(1U << PRLAR_NS_SHIFT); + retValue &= extract; + + return retValue; +} + +/* + * Function that writes an MPU "translation" into the MPU registers. If not + * possible (e.g., if no more MPU regions available) boot is aborted. + */ +static void mpu_map_region(mmap_region_t *mm) +{ + uint64_t prenr_el2_value = 0UL; + uint64_t prbar_attrs = 0UL; + uint64_t prlar_attrs = 0UL; + int region_to_use = 0; + + /* If all MPU regions in use, then abort boot: */ + prenr_el2_value = read_prenr_el2(); + assert(prenr_el2_value != 0xffffffff); + + /* Find and select first-available MPU region (PRENR has an enable bit + * for each MPU region, 1 for in-use or 0 for unused): + */ + for (region_to_use = 0; region_to_use < N_MPU_REGIONS; + region_to_use++) { + if (((prenr_el2_value >> region_to_use) & 1) == 0) { + break; + } + } + write_prselr_el2((uint64_t) (region_to_use)); + isb(); + + /* Set base and limit addresses: */ + write_prbar_el2(mm->base_pa & PRBAR_PRLAR_ADDR_MASK); + write_prlar_el2((mm->base_pa + mm->size - 1UL) + & PRBAR_PRLAR_ADDR_MASK); + dsbsy(); + isb(); + + /* Set attributes: */ + prbar_attrs = prbar_attr_value(mm->attr); + write_prbar_el2(read_prbar_el2() | prbar_attrs); + prlar_attrs = prlar_attr_value(mm->attr); + write_prlar_el2(read_prlar_el2() | prlar_attrs); + dsbsy(); + isb(); + + /* Mark this MPU region as used: */ + prenr_el2_value |= (1 << region_to_use); + write_prenr_el2(prenr_el2_value); + isb(); +} + +/* + * Function that verifies that a region can be mapped. + * Returns: + * 0: Success, the mapping is allowed. + * EINVAL: Invalid values were used as arguments. + * ERANGE: The memory limits were surpassed. + * ENOMEM: There is not enough memory in the mmap array. + * EPERM: Region overlaps another one in an invalid way. + */ +static int mmap_add_region_check(const xlat_ctx_t *ctx, const mmap_region_t *mm) +{ + unsigned long long base_pa = mm->base_pa; + uintptr_t base_va = mm->base_va; + size_t size = mm->size; + + unsigned long long end_pa = base_pa + size - 1U; + uintptr_t end_va = base_va + size - 1U; + + if (base_pa != base_va) { + return -EINVAL; /* MPU does not perform address translation */ + } + if ((base_pa % 64ULL) != 0ULL) { + return -EINVAL; /* MPU requires 64-byte alignment */ + } + /* Check for overflows */ + if ((base_pa > end_pa) || (base_va > end_va)) { + return -ERANGE; + } + if (end_pa > ctx->pa_max_address) { + return -ERANGE; + } + /* Check that there is space in the ctx->mmap array */ + if (ctx->mmap[ctx->mmap_num - 1].size != 0U) { + return -ENOMEM; + } + /* Check for PAs and VAs overlaps with all other regions */ + for (const mmap_region_t *mm_cursor = ctx->mmap; + mm_cursor->size != 0U; ++mm_cursor) { + + uintptr_t mm_cursor_end_va = + mm_cursor->base_va + mm_cursor->size - 1U; + + /* + * Check if one of the regions is completely inside the other + * one. + */ + bool fully_overlapped_va = + ((base_va >= mm_cursor->base_va) && + (end_va <= mm_cursor_end_va)) || + ((mm_cursor->base_va >= base_va) && + (mm_cursor_end_va <= end_va)); + + /* + * Full VA overlaps are only allowed if both regions are + * identity mapped (zero offset) or have the same VA to PA + * offset. Also, make sure that it's not the exact same area. + * This can only be done with static regions. + */ + if (fully_overlapped_va) { + +#if PLAT_XLAT_TABLES_DYNAMIC + if (((mm->attr & MT_DYNAMIC) != 0U) || + ((mm_cursor->attr & MT_DYNAMIC) != 0U)) { + return -EPERM; + } +#endif /* PLAT_XLAT_TABLES_DYNAMIC */ + if ((mm_cursor->base_va - mm_cursor->base_pa) + != (base_va - base_pa)) { + return -EPERM; + } + if ((base_va == mm_cursor->base_va) && + (size == mm_cursor->size)) { + return -EPERM; + } + } else { + /* + * If the regions do not have fully overlapping VAs, + * then they must have fully separated VAs and PAs. + * Partial overlaps are not allowed + */ + + unsigned long long mm_cursor_end_pa = + mm_cursor->base_pa + mm_cursor->size - 1U; + + bool separated_pa = (end_pa < mm_cursor->base_pa) || + (base_pa > mm_cursor_end_pa); + bool separated_va = (end_va < mm_cursor->base_va) || + (base_va > mm_cursor_end_va); + + if (!separated_va || !separated_pa) { + return -EPERM; + } + } + } + + return 0; +} + +void mmap_add_region_ctx(xlat_ctx_t *ctx, const mmap_region_t *mm) +{ + mmap_region_t *mm_cursor = ctx->mmap, *mm_destination; + const mmap_region_t *mm_end = ctx->mmap + ctx->mmap_num; + const mmap_region_t *mm_last; + unsigned long long end_pa = mm->base_pa + mm->size - 1U; + uintptr_t end_va = mm->base_va + mm->size - 1U; + int ret; + + /* Ignore empty regions */ + if (mm->size == 0U) { + return; + } + + /* Static regions must be added before initializing the xlat tables. */ + assert(!ctx->initialized); + + ret = mmap_add_region_check(ctx, mm); + if (ret != 0) { + ERROR("mmap_add_region_check() failed. error %d\n", ret); + assert(false); + return; + } + + /* + * Find the last entry marker in the mmap + */ + mm_last = ctx->mmap; + while ((mm_last->size != 0U) && (mm_last < mm_end)) { + ++mm_last; + } + + /* + * Check if we have enough space in the memory mapping table. + * This shouldn't happen as we have checked in mmap_add_region_check + * that there is free space. + */ + assert(mm_last->size == 0U); + + /* Make room for new region by moving other regions up by one place */ + mm_destination = mm_cursor + 1; + (void)memmove(mm_destination, mm_cursor, + (uintptr_t)mm_last - (uintptr_t)mm_cursor); + + /* + * Check we haven't lost the empty sentinel from the end of the array. + * This shouldn't happen as we have checked in mmap_add_region_check + * that there is free space. + */ + assert(mm_end->size == 0U); + + *mm_cursor = *mm; + + if (end_pa > ctx->max_pa) { + ctx->max_pa = end_pa; + } + if (end_va > ctx->max_va) { + ctx->max_va = end_va; + } +} + +void mmap_add_ctx(xlat_ctx_t *ctx, const mmap_region_t *mm) +{ + const mmap_region_t *mm_cursor = mm; + + while (mm_cursor->granularity != 0U) { + mmap_add_region_ctx(ctx, mm_cursor); + mm_cursor++; + } +} + +void __init init_xlat_tables_ctx(xlat_ctx_t *ctx) +{ + uint64_t mair = UL(0); + + assert(ctx != NULL); + assert(!ctx->initialized); + assert((ctx->xlat_regime == EL2_REGIME) || + (ctx->xlat_regime == EL1_EL0_REGIME)); + /* Note: Add EL3_REGIME if EL3 is supported in future v8-R64 cores. */ + assert(!is_mpu_enabled_ctx(ctx)); + + mmap_region_t *mm = ctx->mmap; + + assert(ctx->va_max_address >= + (xlat_get_min_virt_addr_space_size() - 1U)); + assert(ctx->va_max_address <= (MAX_VIRT_ADDR_SPACE_SIZE - 1U)); + assert(IS_POWER_OF_TWO(ctx->va_max_address + 1U)); + + xlat_mmap_print(mm); + + /* All tables must be zeroed before mapping any region. */ + + for (unsigned int i = 0U; i < ctx->base_table_entries; i++) + ctx->base_table[i] = INVALID_DESC; + + /* Also mark all MPU regions as invalid in the MPU hardware itself: */ + write_prenr_el2(0); + /* Sufficient for current, max-32-region implementations. */ + dsbsy(); + isb(); + while (mm->size != 0U) { + if (read_prenr_el2() == ALL_MPU_EL2_REGIONS_USED) { + ERROR("Not enough MPU regions to map region:\n" + " VA:0x%lx PA:0x%llx size:0x%zx attr:0x%x\n", + mm->base_va, mm->base_pa, mm->size, mm->attr); + panic(); + } else { +#if !(HW_ASSISTED_COHERENCY || WARMBOOT_ENABLE_DCACHE_EARLY) + xlat_clean_dcache_range((uintptr_t)mm->base_va, + mm->size); +#endif + mpu_map_region(mm); + } + mm++; + } + + ctx->initialized = true; + + xlat_tables_print(ctx); + + /* 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); + write_mair_el2(mair); + dsbsy(); + isb(); +} + +/* + * Function to wipe clean and disable all MPU regions. This function expects + * that the MPU has already been turned off, and caching concerns addressed, + * but it nevertheless also explicitly turns off the MPU. + */ +void clear_all_mpu_regions(void) +{ + uint64_t sctlr_el2_value = 0UL; + uint64_t region_n = 0UL; + + /* + * MPU should already be disabled, but explicitly disable it + * nevertheless: + */ + sctlr_el2_value = read_sctlr_el2() & ~(1UL); + write_sctlr_el2(sctlr_el2_value); + + /* Disable all regions: */ + write_prenr_el2(0UL); + + /* Sequence through all regions, zeroing them out and turning off: */ + for (region_n = 0UL; region_n < N_MPU_REGIONS; region_n++) { + write_prselr_el2(region_n); + isb(); + write_prbar_el2((uint64_t) 0); + write_prlar_el2((uint64_t) 0); + dsbsy(); + isb(); + } +} diff --git a/lib/xlat_mpu/xlat_mpu_private.h b/lib/xlat_mpu/xlat_mpu_private.h new file mode 100644 index 0000000..14800e9 --- /dev/null +++ b/lib/xlat_mpu/xlat_mpu_private.h @@ -0,0 +1,103 @@ +/* + * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#ifndef XLAT_MPU_PRIVATE_H +#define XLAT_MPU_PRIVATE_H + +#include <stdbool.h> + +#include <lib/xlat_tables/xlat_tables_defs.h> +#include <lib/xlat_tables/xlat_tables_v2.h> + +#include <platform_def.h> + +#if PLAT_XLAT_TABLES_DYNAMIC +/* + * Private shifts and masks to access fields of an mmap attribute + */ +/* Dynamic or static */ +#define MT_DYN_SHIFT U(31) + +/* + * Memory mapping private attributes + * + * Private attributes not exposed in the public header. + */ + +#endif /* PLAT_XLAT_TABLES_DYNAMIC */ + +/* Calculate region-attributes byte for PRBAR part of MPU-region descriptor: */ +uint64_t prbar_attr_value(uint32_t attr); +/* Calculate region-attributes byte for PRLAR part of MPU-region descriptor: */ +uint64_t prlar_attr_value(uint32_t attr); +/* Calculates the attr value for a given PRBAR and PRLAR entry value: */ +uint32_t region_attr(uint64_t prbar_attr, uint64_t prlar_attr); + +#define PRBAR_PRLAR_ADDR_MASK UL(0xffffffffffc0) + /* mask for PRBAR & PRLAR MPU-region field */ +/* MPU region attribute bit fields: */ +#define PRBAR_SH_SHIFT UL(4) +#define PRBAR_SH_MASK UL(0x3) +#define PRBAR_AP_SHIFT UL(2) +#define PRBAR_AP_MASK UL(0x3) +#define PRBAR_XN_SHIFT UL(1) +#define PRBAR_XN_MASK UL(0x3) +#define PRLAR_NS_SHIFT UL(4) +#define PRLAR_NS_MASK UL(0x3) +#define PRBAR_ATTR_SHIFT UL(0) +#define PRBAR_ATTR_MASK UL(0x3f) +#define PRLAR_ATTR_SHIFT UL(1) +#define PRLAR_ATTR_MASK UL(0x7) +#define PRLAR_EN_SHIFT UL(0) +#define PRLAR_EN_MASK UL(0x1) +/* Aspects of the source attributes not defined elsewhere: */ +#define MT_PERM_MASK UL(0x1) +#define MT_SEC_MASK UL(0x1) +#define MT_EXECUTE_MASK UL(0x3) +#define MT_TYPE_SHIFT UL(0) + +extern uint64_t mmu_cfg_params[MMU_CFG_PARAM_MAX]; + +/* + * Return the execute-never mask that will prevent instruction fetch at the + * given translation regime. + */ +uint64_t xlat_arch_regime_get_xn_desc(int xlat_regime); + +/* Print VA, PA, size and attributes of all regions in the mmap array. */ +void xlat_mmap_print(const mmap_region_t *mmap); + +/* + * Print the current state of the translation tables by reading them from + * memory. + */ +void xlat_tables_print(xlat_ctx_t *ctx); + +/* + * Returns a block/page table descriptor for the given level and attributes. + */ +uint64_t xlat_desc(const xlat_ctx_t *ctx, uint32_t attr, + unsigned long long addr_pa, unsigned int level); + +/* + * Architecture-specific initialization code. + */ + +/* Returns the current Exception Level. The returned EL must be 1 or higher. */ +unsigned int xlat_arch_current_el(void); + +/* + * Returns true if the MMU of the translation regime managed by the given + * xlat_ctx_t is enabled, false otherwise. + */ +bool is_mpu_enabled_ctx(const xlat_ctx_t *ctx); + +/* + * Returns minimum virtual address space size supported by the architecture + */ +uintptr_t xlat_get_min_virt_addr_space_size(void); + +#endif /* XLAT_MPU_PRIVATE_H */ diff --git a/lib/xlat_mpu/xlat_mpu_utils.c b/lib/xlat_mpu/xlat_mpu_utils.c new file mode 100644 index 0000000..dc5f956 --- /dev/null +++ b/lib/xlat_mpu/xlat_mpu_utils.c @@ -0,0 +1,83 @@ +/* + * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> +#include <errno.h> +#include <stdbool.h> +#include <stdint.h> +#include <stdio.h> + +#include <common/debug.h> +#include <lib/utils_def.h> +#include <lib/xlat_tables/xlat_tables_defs.h> +#include <lib/xlat_tables/xlat_tables_v2.h> +#include "xlat_mpu_private.h" + +#include <fvp_r_arch_helpers.h> +#include <platform_def.h> + +#warning "xlat_mpu library is currently experimental and its API may change in future." + + +void xlat_mmap_print(__unused const mmap_region_t *mmap) +{ + /* Empty */ +} + +#if LOG_LEVEL < LOG_LEVEL_VERBOSE + +void xlat_tables_print(__unused xlat_ctx_t *ctx) +{ + /* Empty */ +} + +#else /* if LOG_LEVEL >= LOG_LEVEL_VERBOSE */ + +static void xlat_tables_print_internal(__unused xlat_ctx_t *ctx) +{ + int region_to_use = 0; + uintptr_t region_base; + size_t region_size; + uint64_t prenr_el2_value = 0U; + + /* + * Keep track of how many invalid descriptors are counted in a row. + * Whenever multiple invalid descriptors are found, only the first one + * is printed, and a line is added to inform about how many descriptors + * have been omitted. + */ + + /* + * TODO: Remove this WARN() and comment when these API calls are more + * completely implemented and tested! + */ + WARN("%s in this early version of xlat_mpu library may not produce reliable results!", + __func__); + + /* + * Sequence through all regions and print those in-use (PRENR has an + * enable bit for each MPU region, 1 for in-use or 0 for unused): + */ + prenr_el2_value = read_prenr_el2(); + for (region_to_use = 0; region_to_use < N_MPU_REGIONS; + region_to_use++) { + if (((prenr_el2_value >> region_to_use) & 1U) == 0U) { + continue; + } + region_base = read_prbar_el2() & PRBAR_PRLAR_ADDR_MASK; + region_size = read_prlar_el2() & PRBAR_PRLAR_ADDR_MASK; + printf("Address: 0x%llx, size: 0x%llx ", + (long long) region_base, + (long long) region_size); + } +} + +void xlat_tables_print(__unused xlat_ctx_t *ctx) +{ + xlat_tables_print_internal(ctx); +} + +#endif /* LOG_LEVEL >= LOG_LEVEL_VERBOSE */ |