diff options
| -rw-r--r-- | arch/x86/kernel/acpi/boot.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 3d525c6124f6..803b684676ff 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -1338,6 +1338,26 @@ static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d) } /* + * ACPI offers an alternative platform interface model that removes + * ACPI hardware requirements for platforms that do not implement + * the PC Architecture. + * + * We initialize the Hardware-reduced ACPI model here: + */ +static void __init acpi_reduced_hw_init(void) +{ + if (acpi_gbl_reduced_hardware) { + /* + * Override x86_init functions and bypass legacy pic + * in Hardware-reduced ACPI mode + */ + x86_init.timers.timer_init = x86_init_noop; + x86_init.irqs.pre_vector_init = x86_init_noop; + legacy_pic = &null_legacy_pic; + } +} + +/* * If your system is blacklisted here, but you find that acpi=force * works for you, please contact linux-acpi@vger.kernel.org */ @@ -1536,6 +1556,11 @@ int __init early_acpi_boot_init(void) */ early_acpi_process_madt(); + /* + * Hardware-reduced ACPI mode initialization: + */ + acpi_reduced_hw_init(); + return 0; } |