3  *  ARM64 Specific Low-Level ACPI Boot Support
13 #define pr_fmt(fmt) "ACPI: " fmt
15 #include <linux/acpi.h>
32 #include <acpi/ghes.h>
33 #include <acpi/processor.h>
39 int acpi_noirq = 1;		/* skip ACPI IRQ initialization */
43 int acpi_pci_disabled = 1;	/* skip ACPI PCI scan and IRQ initialization */
56 	/* "acpi=off" disables both ACPI table parsing and interpreter */  in parse_acpi()
59 	else if (strcmp(arg, "on") == 0) /* prefer ACPI over DT */  in parse_acpi()
61 	else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */  in parse_acpi()
70 early_param("acpi", parse_acpi);
92  * or early_memremap() should be called here to for ACPI table mapping.
136 	 * and carry out revision and ACPI HW reduced compliancy tests  in acpi_fadt_sanity_check()
150 	 * is a minor revision of FADT which was introduced by ACPI 5.1,  in acpi_fadt_sanity_check()
151 	 * we only deal with ACPI 5.1 or newer revision to get GIC and SMP  in acpi_fadt_sanity_check()
167 		pr_err("FADT not ACPI hardware reduced compliant\n");  in acpi_fadt_sanity_check()
184  *	3. check ACPI FADT revision
185  *	4. check ACPI FADT HW reduced flag
187  * We can parse ACPI boot-time tables such as MADT after
190  * On return ACPI is enabled if either:
192  * - ACPI tables are initialized and sanity checks passed
193  * - acpi=force was passed in the command line and ACPI was not disabled
194  *   explicitly through acpi=off command line parameter
196  * ACPI is disabled on function return otherwise
201 	 * Enable ACPI instead of device tree unless  in acpi_boot_table_init()
202 	 * - ACPI has been disabled explicitly (acpi=off), or  in acpi_boot_table_init()
205 	 *   and ACPI has not been [force] enabled (acpi=on|force)  in acpi_boot_table_init()
212 	 * ACPI is disabled at this point. Enable it in order to parse  in acpi_boot_table_init()
213 	 * the ACPI tables and carry out sanity checks  in acpi_boot_table_init()
218 	 * If ACPI tables are initialized and FADT sanity checks passed,  in acpi_boot_table_init()
219 	 * leave ACPI enabled and carry on booting; otherwise disable ACPI  in acpi_boot_table_init()
221 	 * If acpi=force was passed on the command line it forces ACPI  in acpi_boot_table_init()
225 		pr_err("Failed to init ACPI tables\n");  in acpi_boot_table_init()
250 		 * behaviour, use acpi=nospcr to disable console in ACPI SPCR  in acpi_boot_table_init()
255 		pr_info("Use ACPI SPCR as default console: %s\n",  in acpi_boot_table_init()
342 			 * NOMAP attribute set: this enables the use of ACPI  in acpi_os_ioremap()
361 			 * ACPI reclaim memory is used to pass firmware tables  in acpi_os_ioremap()