3  *  RISC-V Specific Low-Level ACPI Boot Support
16 #include <linux/acpi.h>
22 int acpi_noirq = 1;		/* skip ACPI IRQ initialization */
26 int acpi_pci_disabled = 1;	/* skip ACPI PCI scan and IRQ initialization */
40 	/* "acpi=off" disables both ACPI table parsing and interpreter */  in parse_acpi()
43 	else if (strcmp(arg, "on") == 0) /* prefer ACPI over DT */  in parse_acpi()
45 	else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */  in parse_acpi()
52 early_param("acpi", parse_acpi);
69 	 * and carry out revision and ACPI HW reduced compliancy tests  in acpi_fadt_sanity_check()
87 	 * the ACPI spec, we need to update this check for exact minor revision  in acpi_fadt_sanity_check()
94 		pr_err("FADT not ACPI hardware reduced compliant\n");  in acpi_fadt_sanity_check()
110  *	3. check ACPI FADT HW reduced flag
112  * We can parse ACPI boot-time tables such as MADT after
115  * On return ACPI is enabled if either:
117  * - ACPI tables are initialized and sanity checks passed
118  * - acpi=force was passed in the command line and ACPI was not disabled
119  *   explicitly through acpi=off command line parameter
121  * ACPI is disabled on function return otherwise
126 	 * Enable ACPI instead of device tree unless  in acpi_boot_table_init()
127 	 * - ACPI has been disabled explicitly (acpi=off), or  in acpi_boot_table_init()
128 	 * - firmware has not populated ACPI ptr in EFI system table  in acpi_boot_table_init()
129 	 *   and ACPI has not been [force] enabled (acpi=on|force)  in acpi_boot_table_init()
137 	 * ACPI is disabled at this point. Enable it in order to parse  in acpi_boot_table_init()
138 	 * the ACPI tables and carry out sanity checks  in acpi_boot_table_init()
143 	 * If ACPI tables are initialized and FADT sanity checks passed,  in acpi_boot_table_init()
144 	 * leave ACPI enabled and carry on booting; otherwise disable ACPI  in acpi_boot_table_init()
146 	 * If acpi=force was passed on the command line it forces ACPI  in acpi_boot_table_init()
150 		pr_err("Failed to init ACPI tables\n");  in acpi_boot_table_init()
177  * Instead of parsing (and freeing) the ACPI table, cache
201  * or early_memremap() should be called here to for ACPI table mapping.
265 			 * NOMAP attribute set: this enables the use of ACPI  in acpi_os_ioremap()
282 			 * ACPI reclaim memory is used to pass firmware tables  in acpi_os_ioremap()
309  * These interfaces are defined just to enable building ACPI core.
311  * controller support is added in RISC-V ACPI.