3  *  ARM64 Specific Low-Level ACPI Boot Support
13 #define pr_fmt(fmt) "ACPI: " fmt
15 #include <linux/acpi.h>
31 #include <acpi/ghes.h>
37 int acpi_noirq = 1;		/* skip ACPI IRQ initialization */
41 int acpi_pci_disabled = 1;	/* skip ACPI PCI scan and IRQ initialization */
53 	/* "acpi=off" disables both ACPI table parsing and interpreter */  in parse_acpi()
56 	else if (strcmp(arg, "on") == 0) /* prefer ACPI over DT */  in parse_acpi()
58 	else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */  in parse_acpi()
65 early_param("acpi", parse_acpi);
87  * or early_memremap() should be called here to for ACPI table mapping.
131 	 * and carry out revision and ACPI HW reduced compliancy tests  in acpi_fadt_sanity_check()
145 	 * is a minor revision of FADT which was introduced by ACPI 5.1,  in acpi_fadt_sanity_check()
146 	 * we only deal with ACPI 5.1 or newer revision to get GIC and SMP  in acpi_fadt_sanity_check()
162 		pr_err("FADT not ACPI hardware reduced compliant\n");  in acpi_fadt_sanity_check()
179  *	3. check ACPI FADT revision
180  *	4. check ACPI FADT HW reduced flag
182  * We can parse ACPI boot-time tables such as MADT after
185  * On return ACPI is enabled if either:
187  * - ACPI tables are initialized and sanity checks passed
188  * - acpi=force was passed in the command line and ACPI was not disabled
189  *   explicitly through acpi=off command line parameter
191  * ACPI is disabled on function return otherwise
196 	 * Enable ACPI instead of device tree unless  in acpi_boot_table_init()
197 	 * - ACPI has been disabled explicitly (acpi=off), or  in acpi_boot_table_init()
200 	 *   and ACPI has not been [force] enabled (acpi=on|force)  in acpi_boot_table_init()
207 	 * ACPI is disabled at this point. Enable it in order to parse  in acpi_boot_table_init()
208 	 * the ACPI tables and carry out sanity checks  in acpi_boot_table_init()
213 	 * If ACPI tables are initialized and FADT sanity checks passed,  in acpi_boot_table_init()
214 	 * leave ACPI enabled and carry on booting; otherwise disable ACPI  in acpi_boot_table_init()
216 	 * If acpi=force was passed on the command line it forces ACPI  in acpi_boot_table_init()
220 		pr_err("Failed to init ACPI tables\n");  in acpi_boot_table_init()
315 			 * NOMAP attribute set: this enables the use of ACPI  in acpi_os_ioremap()
334 			 * ACPI reclaim memory is used to pass firmware tables  in acpi_os_ioremap()
418  * Implements ARM64 specific callbacks to support ACPI FFH Operation Region as