More X86-64 boot options can be found in
Documentation/x86/x86_64/boot-options.txt .
X86 Either 32-bit or 64-bit x86 (same as X86-32+X86-64)
+ X86_UV SGI UV support is enabled.
XEN Xen support is enabled
In addition, the following text indicates that the option:
acpi= [HW,ACPI,X86,ARM64]
Advanced Configuration and Power Interface
- Format: { force | off | strict | noirq | rsdt |
+ Format: { force | on | off | strict | noirq | rsdt |
copy_dsdt }
force -- enable ACPI if default was off
+ on -- enable ACPI but allow fallback to DT [arm64]
off -- disable ACPI if default was on
noirq -- do not use ACPI for IRQ routing
strict -- Be less tolerant of platforms that are not
strictly ACPI specification compliant.
rsdt -- prefer RSDT over (default) XSDT
copy_dsdt -- copy DSDT to memory
- For ARM64, ONLY "acpi=off" or "acpi=force" are available
+ For ARM64, ONLY "acpi=off", "acpi=on" or "acpi=force"
+ are available
See also Documentation/power/runtime_pm.txt, pci=noacpi
acpi_osi=!* # remove all strings
acpi_osi=! # disable all built-in OS vendor
strings
+ acpi_osi=!! # enable all built-in OS vendor
+ strings
acpi_osi= # disable all strings
'acpi_osi=!' can be used in combination with single or
Format: <int> (must be >=0)
Default: 64
+ bau= [X86_UV] Enable the BAU on SGI UV. The default
+ behavior is to disable the BAU (i.e. bau=0).
+ Format: { "0" | "1" }
+ 0 - Disable the BAU.
+ 1 - Enable the BAU.
+ unset - Disable the BAU.
+
baycom_epp= [HW,AX25]
Format: <io>,<mode>
hwp_only
Only load intel_pstate on systems which support
hardware P state control (HWP) if available.
+ support_acpi_ppc
+ Enforce ACPI _PPC performance limits. If the Fixed ACPI
+ Description Table, specifies preferred power management
+ profile as "Enterprise Server" or "Performance Server",
+ then this feature is turned on by default.
intremap= [X86-64, Intel-IOMMU]
on enable Interrupt Remapping (default)
Lazy RCU callbacks are those which RCU can
prove do nothing more than free memory.
+ rcuperf.gp_exp= [KNL]
+ Measure performance of expedited synchronous
+ grace-period primitives.
+
+ rcuperf.holdoff= [KNL]
+ Set test-start holdoff period. The purpose of
+ this parameter is to delay the start of the
+ test until boot completes in order to avoid
+ interference.
+
+ rcuperf.nreaders= [KNL]
+ Set number of RCU readers. The value -1 selects
+ N, where N is the number of CPUs. A value
+ "n" less than -1 selects N-n+1, where N is again
+ the number of CPUs. For example, -2 selects N
+ (the number of CPUs), -3 selects N+1, and so on.
+ A value of "n" less than or equal to -N selects
+ a single reader.
+
+ rcuperf.nwriters= [KNL]
+ Set number of RCU writers. The values operate
+ the same as for rcuperf.nreaders.
+ N, where N is the number of CPUs
+
+ rcuperf.perf_runnable= [BOOT]
+ Start rcuperf running at boot time.
+
+ rcuperf.shutdown= [KNL]
+ Shut the system down after performance tests
+ complete. This is useful for hands-off automated
+ testing.
+
+ rcuperf.perf_type= [KNL]
+ Specify the RCU implementation to test.
+
+ rcuperf.verbose= [KNL]
+ Enable additional printk() statements.
+
rcutorture.cbflood_inter_holdoff= [KNL]
Set holdoff time (jiffies) between successive
callback-flood tests.
{
struct acpi_table_madt *madt = NULL;
- if (!cpu_has_apic)
+ if (!boot_cpu_has(X86_FEATURE_APIC))
return -EINVAL;
madt = (struct acpi_table_madt *)table;
polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
- acpi_penalize_sci_irq(bus_irq, trigger, polarity);
/*
* stash over-ride to indicate we've been here
static int __init acpi_parse_fadt(struct acpi_table_header *table)
{
+ if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
+ pr_debug("ACPI: no legacy devices present\n");
+ x86_platform.legacy.devices.pnpbios = 0;
+ }
+
+ if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
+ pr_debug("ACPI: not registering RTC platform device\n");
+ x86_platform.legacy.rtc = 0;
+ }
#ifdef CONFIG_X86_PM_TIMER
/* detect the location of the ACPI PM Timer */
{
int count;
- if (!cpu_has_apic)
+ if (!boot_cpu_has(X86_FEATURE_APIC))
return -ENODEV;
/*
int ret;
struct acpi_subtable_proc madt_proc[2];
- if (!cpu_has_apic)
+ if (!boot_cpu_has(X86_FEATURE_APIC))
return -ENODEV;
/*
if (acpi_disabled || acpi_noirq)
return -ENODEV;
- if (!cpu_has_apic)
+ if (!boot_cpu_has(X86_FEATURE_APIC))
return -ENODEV;
/*
*/
void __init efi_reserve_boot_services(void)
{
- void *p;
+ efi_memory_desc_t *md;
- for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
- efi_memory_desc_t *md = p;
+ for_each_efi_memory_desc(md) {
u64 start = md->phys_addr;
u64 size = md->num_pages << EFI_PAGE_SHIFT;
bool already_reserved;
void __init efi_free_boot_services(void)
{
- void *p;
+ efi_memory_desc_t *md;
- for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
- efi_memory_desc_t *md = p;
+ for_each_efi_memory_desc(md) {
unsigned long long start = md->phys_addr;
unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
bool efi_poweroff_required(void)
{
- return !!acpi_gbl_reduced_hardware;
+ return acpi_gbl_reduced_hardware || acpi_no_s5;
}
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