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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:13:47 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:13:47 +0000 |
commit | 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 (patch) | |
tree | bcf648efac40ca6139842707f0eba5a4496a6dd2 /services/std_svc/spm/spm_mm/spm_mm_xlat.c | |
parent | Initial commit. (diff) | |
download | arm-trusted-firmware-102b0d2daa97dae68d3eed54d8fe37a9cc38a892.tar.xz arm-trusted-firmware-102b0d2daa97dae68d3eed54d8fe37a9cc38a892.zip |
Adding upstream version 2.8.0+dfsg.upstream/2.8.0+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'services/std_svc/spm/spm_mm/spm_mm_xlat.c')
-rw-r--r-- | services/std_svc/spm/spm_mm/spm_mm_xlat.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/services/std_svc/spm/spm_mm/spm_mm_xlat.c b/services/std_svc/spm/spm_mm/spm_mm_xlat.c new file mode 100644 index 0000000..6261016 --- /dev/null +++ b/services/std_svc/spm/spm_mm/spm_mm_xlat.c @@ -0,0 +1,159 @@ +/* + * Copyright (c) 2018-2022, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <arch.h> +#include <arch_helpers.h> +#include <assert.h> +#include <errno.h> +#include <lib/xlat_tables/xlat_tables_v2.h> +#include <platform_def.h> +#include <plat/common/platform.h> +#include <services/spm_mm_partition.h> +#include <services/spm_mm_svc.h> + +#include "spm_mm_private.h" +#include "spm_mm_shim_private.h" + +/* Place translation tables by default along with the ones used by BL31. */ +#ifndef PLAT_SP_IMAGE_XLAT_SECTION_NAME +#define PLAT_SP_IMAGE_XLAT_SECTION_NAME "xlat_table" +#endif +#ifndef PLAT_SP_IMAGE_BASE_XLAT_SECTION_NAME +#define PLAT_SP_IMAGE_BASE_XLAT_SECTION_NAME ".bss" +#endif + +/* Allocate and initialise the translation context for the secure partitions. */ +REGISTER_XLAT_CONTEXT2(sp, + PLAT_SP_IMAGE_MMAP_REGIONS, + PLAT_SP_IMAGE_MAX_XLAT_TABLES, + PLAT_VIRT_ADDR_SPACE_SIZE, PLAT_PHY_ADDR_SPACE_SIZE, + EL1_EL0_REGIME, PLAT_SP_IMAGE_XLAT_SECTION_NAME, + PLAT_SP_IMAGE_BASE_XLAT_SECTION_NAME); + +/* Lock used for SP_MEMORY_ATTRIBUTES_GET and SP_MEMORY_ATTRIBUTES_SET */ +static spinlock_t mem_attr_smc_lock; + +/* Get handle of Secure Partition translation context */ +xlat_ctx_t *spm_get_sp_xlat_context(void) +{ + return &sp_xlat_ctx; +}; + +/* + * Attributes are encoded using a different format in the SMC interface than in + * the Trusted Firmware, where the mmap_attr_t enum type is used. This function + * converts an attributes value from the SMC format to the mmap_attr_t format by + * setting MT_RW/MT_RO, MT_USER/MT_PRIVILEGED and MT_EXECUTE/MT_EXECUTE_NEVER. + * The other fields are left as 0 because they are ignored by the function + * xlat_change_mem_attributes_ctx(). + */ +static unsigned int smc_attr_to_mmap_attr(unsigned int attributes) +{ + unsigned int tf_attr = 0U; + + unsigned int access = (attributes & MM_SP_MEMORY_ATTRIBUTES_ACCESS_MASK) + >> MM_SP_MEMORY_ATTRIBUTES_ACCESS_SHIFT; + + if (access == MM_SP_MEMORY_ATTRIBUTES_ACCESS_RW) { + tf_attr |= MT_RW | MT_USER; + } else if (access == MM_SP_MEMORY_ATTRIBUTES_ACCESS_RO) { + tf_attr |= MT_RO | MT_USER; + } else { + /* Other values are reserved. */ + assert(access == MM_SP_MEMORY_ATTRIBUTES_ACCESS_NOACCESS); + /* The only requirement is that there's no access from EL0 */ + tf_attr |= MT_RO | MT_PRIVILEGED; + } + + if ((attributes & MM_SP_MEMORY_ATTRIBUTES_NON_EXEC) == 0) { + tf_attr |= MT_EXECUTE; + } else { + tf_attr |= MT_EXECUTE_NEVER; + } + + return tf_attr; +} + +/* + * This function converts attributes from the Trusted Firmware format into the + * SMC interface format. + */ +static unsigned int smc_mmap_to_smc_attr(unsigned int attr) +{ + unsigned int smc_attr = 0U; + + unsigned int data_access; + + if ((attr & MT_USER) == 0) { + /* No access from EL0. */ + data_access = MM_SP_MEMORY_ATTRIBUTES_ACCESS_NOACCESS; + } else { + if ((attr & MT_RW) != 0) { + assert(MT_TYPE(attr) != MT_DEVICE); + data_access = MM_SP_MEMORY_ATTRIBUTES_ACCESS_RW; + } else { + data_access = MM_SP_MEMORY_ATTRIBUTES_ACCESS_RO; + } + } + + smc_attr |= (data_access & MM_SP_MEMORY_ATTRIBUTES_ACCESS_MASK) + << MM_SP_MEMORY_ATTRIBUTES_ACCESS_SHIFT; + + if ((attr & MT_EXECUTE_NEVER) != 0U) { + smc_attr |= MM_SP_MEMORY_ATTRIBUTES_NON_EXEC; + } + + return smc_attr; +} + +int32_t spm_memory_attributes_get_smc_handler(sp_context_t *sp_ctx, + uintptr_t base_va) +{ + uint32_t attributes; + + spin_lock(&mem_attr_smc_lock); + + int rc = xlat_get_mem_attributes_ctx(sp_ctx->xlat_ctx_handle, + base_va, &attributes); + + spin_unlock(&mem_attr_smc_lock); + + /* Convert error codes of xlat_get_mem_attributes_ctx() into SPM. */ + assert((rc == 0) || (rc == -EINVAL)); + + if (rc == 0) { + return (int32_t) smc_mmap_to_smc_attr(attributes); + } else { + return SPM_MM_INVALID_PARAMETER; + } +} + +int spm_memory_attributes_set_smc_handler(sp_context_t *sp_ctx, + u_register_t page_address, + u_register_t pages_count, + u_register_t smc_attributes) +{ + uintptr_t base_va = (uintptr_t) page_address; + size_t size = (size_t) (pages_count * PAGE_SIZE); + uint32_t attributes = (uint32_t) smc_attributes; + + INFO(" Start address : 0x%lx\n", base_va); + INFO(" Number of pages: %i (%zi bytes)\n", (int) pages_count, size); + INFO(" Attributes : 0x%x\n", attributes); + + spin_lock(&mem_attr_smc_lock); + + int ret = xlat_change_mem_attributes_ctx(sp_ctx->xlat_ctx_handle, + base_va, size, + smc_attr_to_mmap_attr(attributes)); + + spin_unlock(&mem_attr_smc_lock); + + /* Convert error codes of xlat_change_mem_attributes_ctx() into SPM. */ + assert((ret == 0) || (ret == -EINVAL)); + + return (ret == 0) ? SPM_MM_SUCCESS : SPM_MM_INVALID_PARAMETER; +} |