3  *  RISC-V Specific Low-Level ACPI Boot Support
16 #include <linux/acpi.h>
24 int acpi_noirq = 1;		/* skip ACPI IRQ initialization */
28 int acpi_pci_disabled = 1;	/* skip ACPI PCI scan and IRQ initialization */
42 	/* "acpi=off" disables both ACPI table parsing and interpreter */  in parse_acpi()
45 	else if (strcmp(arg, "on") == 0) /* prefer ACPI over DT */  in parse_acpi()
47 	else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */  in parse_acpi()
54 early_param("acpi", parse_acpi);
71 	 * and carry out revision and ACPI HW reduced compliancy tests  in acpi_fadt_sanity_check()
89 	 * the ACPI spec, we need to update this check for exact minor revision  in acpi_fadt_sanity_check()
96 		pr_err("FADT not ACPI hardware reduced compliant\n");  in acpi_fadt_sanity_check()
112  *	3. check ACPI FADT HW reduced flag
114  * We can parse ACPI boot-time tables such as MADT after
117  * On return ACPI is enabled if either:
119  * - ACPI tables are initialized and sanity checks passed
120  * - acpi=force was passed in the command line and ACPI was not disabled
121  *   explicitly through acpi=off command line parameter
123  * ACPI is disabled on function return otherwise
128 	 * Enable ACPI instead of device tree unless  in acpi_boot_table_init()
129 	 * - ACPI has been disabled explicitly (acpi=off), or  in acpi_boot_table_init()
130 	 * - firmware has not populated ACPI ptr in EFI system table  in acpi_boot_table_init()
131 	 *   and ACPI has not been [force] enabled (acpi=on|force)  in acpi_boot_table_init()
139 	 * ACPI is disabled at this point. Enable it in order to parse  in acpi_boot_table_init()
140 	 * the ACPI tables and carry out sanity checks  in acpi_boot_table_init()
145 	 * If ACPI tables are initialized and FADT sanity checks passed,  in acpi_boot_table_init()
146 	 * leave ACPI enabled and carry on booting; otherwise disable ACPI  in acpi_boot_table_init()
148 	 * If acpi=force was passed on the command line it forces ACPI  in acpi_boot_table_init()
152 		pr_err("Failed to init ACPI tables\n");  in acpi_boot_table_init()
187  * Instead of parsing (and freeing) the ACPI table, cache
206  * or early_memremap() should be called here to for ACPI table mapping.
270 			 * NOMAP attribute set: this enables the use of ACPI  in acpi_os_ioremap()
287 			 * ACPI reclaim memory is used to pass firmware tables  in acpi_os_ioremap()