1 // SPDX-License-Identifier: GPL-2.0-only
3  *  ARM64 Specific Low-Level ACPI Boot Support
5  *  Copyright (C) 2013-2014, Linaro Ltd.
16 #include <linux/arm-smccc.h>
18 #include <linux/efi.h>
19 #include <linux/efi-bgrt.h>
51 		return -EINVAL;  in parse_acpi()
61 		return -EINVAL;	/* Core will print when we return error */  in parse_acpi()
117  * acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
130 	 * FADT is required on arm64; retrieve it to check its presence  in acpi_fadt_sanity_check()
138 		return -ENODEV;  in acpi_fadt_sanity_check()
149 	if (table->revision < 5 ||  in acpi_fadt_sanity_check()
150 	   (table->revision == 5 && fadt->minor_revision < 1)) {  in acpi_fadt_sanity_check()
152 		       table->revision, fadt->minor_revision);  in acpi_fadt_sanity_check()
154 		if (!fadt->arm_boot_flags) {  in acpi_fadt_sanity_check()
155 			ret = -EINVAL;  in acpi_fadt_sanity_check()
161 	if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {  in acpi_fadt_sanity_check()
163 		ret = -EINVAL;  in acpi_fadt_sanity_check()
182  * We can parse ACPI boot-time tables such as MADT after
187  * - ACPI tables are initialized and sanity checks passed
188  * - acpi=force was passed in the command line and ACPI was not disabled
197 	 * - ACPI has been disabled explicitly (acpi=off), or  in acpi_boot_table_init()
198 	 * - the device tree is not empty (it has more than just a /chosen node,  in acpi_boot_table_init()
239 	 * Although UEFI specifies the use of Normal Write-through for  in __acpi_get_writethrough_mem_attribute()
242 	 * purpose, emit a warning and use Normal Non-cacheable instead.  in __acpi_get_writethrough_mem_attribute()
244 	pr_warn_once("No MAIR allocation for EFI_MEMORY_WT; treating as Normal Non-cacheable\n");  in __acpi_get_writethrough_mem_attribute()
251 	 * According to "Table 8 Map: EFI memory types to AArch64 memory  in __acpi_get_mem_attribute()
252 	 * types" of UEFI 2.5 section 2.3.6.1, each EFI memory type is  in __acpi_get_mem_attribute()
254 	 * The EFI memory attribute advises all possible capabilities  in __acpi_get_mem_attribute()
279 		u64 end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);  in acpi_os_ioremap()
281 		if (phys < md->phys_addr || phys >= end)  in acpi_os_ioremap()
285 			pr_warn(FW_BUG "requested region covers multiple EFI memory regions\n");  in acpi_os_ioremap()
294 	 * EFI memory map at all, as it only describes normal memory, and MMIO  in acpi_os_ioremap()
296 	 * the EFI runtime services.  in acpi_os_ioremap()
300 		switch (region->type) {  in acpi_os_ioremap()
347 			if (region->attribute & EFI_MEMORY_WB)  in acpi_os_ioremap()
349 			else if (region->attribute & EFI_MEMORY_WC)  in acpi_os_ioremap()
351 			else if (region->attribute & EFI_MEMORY_WT)  in acpi_os_ioremap()
366 	int err = -ENOENT;  in apei_claim_sea()
391 	 * APEI NMI-like notifications are deferred to irq_work. Unless  in apei_claim_sea()
392 	 * we interrupted irqs-masked code, we can do that now.  in apei_claim_sea()
402 			err = -EINPROGRESS;  in apei_claim_sea()
418  * Implements ARM64 specific callbacks to support ACPI FFH Operation Region as
439 		return -EOPNOTSUPP;  in acpi_ffh_address_space_arch_setup()
444 		return -EOPNOTSUPP;  in acpi_ffh_address_space_arch_setup()
449 		return -ENOMEM;  in acpi_ffh_address_space_arch_setup()
452 		ffh_ctxt->invoke_ffh_fn = __arm_smccc_smc;  in acpi_ffh_address_space_arch_setup()
453 		ffh_ctxt->invoke_ffh64_fn = arm_smccc_1_2_smc;  in acpi_ffh_address_space_arch_setup()
455 		ffh_ctxt->invoke_ffh_fn = __arm_smccc_hvc;  in acpi_ffh_address_space_arch_setup()
456 		ffh_ctxt->invoke_ffh64_fn = arm_smccc_1_2_hvc;  in acpi_ffh_address_space_arch_setup()
459 	memcpy(ffh_ctxt, handler_ctxt, sizeof(ffh_ctxt->info));  in acpi_ffh_address_space_arch_setup()
481 	if (ffh_ctxt->info.offset == 0) {  in acpi_ffh_address_space_arch_handler()
488 		    ffh_ctxt->info.length > 32) {  in acpi_ffh_address_space_arch_handler()
491 			int idx, len = ffh_ctxt->info.length >> 2;  in acpi_ffh_address_space_arch_handler()
496 			ffh_ctxt->invoke_ffh_fn(a[0], a[1], a[2], a[3], a[4],  in acpi_ffh_address_space_arch_handler()
501 	} else if (ffh_ctxt->info.offset == 1) {  in acpi_ffh_address_space_arch_handler()
505 		if (!ARM_SMCCC_IS_FAST_CALL(r->a0) || !ARM_SMCCC_IS_64(r->a0) ||  in acpi_ffh_address_space_arch_handler()
506 		    !acpi_ffh_smccc_owner_allowed(r->a0) ||  in acpi_ffh_address_space_arch_handler()
507 		    ffh_ctxt->info.length > sizeof(*r)) {  in acpi_ffh_address_space_arch_handler()
510 			ffh_ctxt->invoke_ffh64_fn(r, r);  in acpi_ffh_address_space_arch_handler()
511 			memcpy(value, r, ffh_ctxt->info.length);  in acpi_ffh_address_space_arch_handler()