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>
19 #include <linux/efi-bgrt.h>
54 		return -EINVAL;  in parse_acpi()
66 		return -EINVAL;	/* Core will print when we return error */  in parse_acpi()
122  * acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
143 		return -ENODEV;  in acpi_fadt_sanity_check()
154 	if (table->revision < 5 ||  in acpi_fadt_sanity_check()
155 	   (table->revision == 5 && fadt->minor_revision < 1)) {  in acpi_fadt_sanity_check()
157 		       table->revision, fadt->minor_revision);  in acpi_fadt_sanity_check()
159 		if (!fadt->arm_boot_flags) {  in acpi_fadt_sanity_check()
160 			ret = -EINVAL;  in acpi_fadt_sanity_check()
166 	if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {  in acpi_fadt_sanity_check()
168 		ret = -EINVAL;  in acpi_fadt_sanity_check()
187  * We can parse ACPI boot-time tables such as MADT after
192  * - ACPI tables are initialized and sanity checks passed
193  * - acpi=force was passed in the command line and ACPI was not disabled
204 	 * - ACPI has been disabled explicitly (acpi=off), or  in acpi_boot_table_init()
205 	 * - the device tree is not empty (it has more than just a /chosen node,  in acpi_boot_table_init()
242 				((struct acpi_table_facs *)facs)->hardware_signature;  in acpi_boot_table_init()
252 		 * behaviour, use acpi=nospcr to disable console in ACPI SPCR  in acpi_boot_table_init()
258 			pr_info("Use ACPI SPCR as default console: No\n");  in acpi_boot_table_init()
260 			pr_info("Use ACPI SPCR as default console: Yes\n");  in acpi_boot_table_init()
270 	 * Although UEFI specifies the use of Normal Write-through for  in __acpi_get_writethrough_mem_attribute()
273 	 * purpose, emit a warning and use Normal Non-cacheable instead.  in __acpi_get_writethrough_mem_attribute()
275 	pr_warn_once("No MAIR allocation for EFI_MEMORY_WT; treating as Normal Non-cacheable\n");  in __acpi_get_writethrough_mem_attribute()
310 		u64 end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);  in acpi_os_ioremap()
312 		if (phys < md->phys_addr || phys >= end)  in acpi_os_ioremap()
331 		switch (region->type) {  in acpi_os_ioremap()
332 		case EFI_LOADER_CODE:  in acpi_os_ioremap()
333 		case EFI_LOADER_DATA:  in acpi_os_ioremap()
334 		case EFI_BOOT_SERVICES_CODE:  in acpi_os_ioremap()
335 		case EFI_BOOT_SERVICES_DATA:  in acpi_os_ioremap()
336 		case EFI_CONVENTIONAL_MEMORY:  in acpi_os_ioremap()
337 		case EFI_PERSISTENT_MEMORY:  in acpi_os_ioremap()
346 			 * NOMAP attribute set: this enables the use of ACPI  in acpi_os_ioremap()
349 			 * below. As this particular use case only requires  in acpi_os_ioremap()
350 			 * read access, fall through to the R/O mapping case.  in acpi_os_ioremap()
354 		case EFI_RUNTIME_SERVICES_CODE:  in acpi_os_ioremap()
362 		case EFI_ACPI_MEMORY_NVS:  in acpi_os_ioremap()
364 			 * ACPI NVS marks an area reserved for use by the  in acpi_os_ioremap()
368 			 * as read-only.  in acpi_os_ioremap()
373 		case EFI_ACPI_RECLAIM_MEMORY:  in acpi_os_ioremap()
378 			 * that memory and use it for something else. We never  in acpi_os_ioremap()
380 			 * anyway, in which case we should use the existing  in acpi_os_ioremap()
388 			if (region->attribute & EFI_MEMORY_WB)  in acpi_os_ioremap()
390 			else if (region->attribute & EFI_MEMORY_WC)  in acpi_os_ioremap()
392 			else if (region->attribute & EFI_MEMORY_WT)  in acpi_os_ioremap()
407 	int err = -ENOENT;  in apei_claim_sea()
432 	 * APEI NMI-like notifications are deferred to irq_work. Unless  in apei_claim_sea()
433 	 * we interrupted irqs-masked code, we can do that now.  in apei_claim_sea()
443 			err = -EINPROGRESS;  in apei_claim_sea()