提交 4996c023 编写于 作者: T Takao Indoh 提交者: Len Brown

ACPI: introduce "acpi_rsdp=" parameter for kdump

There is a problem with putting the first kernel in EFI virtual mode,
it is that when the second kernel comes up it tries to initialize the
EFI again and once we have put EFI in virtual mode we can not really
do that.

Actually, EFI is not necessary for kdump, we can boot the second kernel
with "noefi" parameter, but the boot will mostly fail because 2nd kernel
cannot find RSDP.

In this situation, we introduced "acpi_rsdp=" kernel parameter, so that
kexec-tools can pass the "noefi acpi_rsdp=X" to the second kernel to
make kdump works. The physical address of the RSDP can be got from
sysfs(/sys/firmware/efi/systab).
Signed-off-by: NTakao Indoh <indou.takao@jp.fujitsu.com>
Reviewed-by: NWANG Cong <amwang@redhat.com>
Reviewed-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: NLen Brown <len.brown@intel.com>
上级 1765a367
......@@ -163,6 +163,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
See also Documentation/power/pm.txt, pci=noacpi
acpi_rsdp= [ACPI,EFI,KEXEC]
Pass the RSDP address to the kernel, mostly used
on machines running EFI runtime service to boot the
second kernel for kdump.
acpi_apic_instance= [ACPI, IOAPIC]
Format: <int>
2: use 2nd APIC table, if available
......
......@@ -237,8 +237,23 @@ void acpi_os_vprintf(const char *fmt, va_list args)
#endif
}
#ifdef CONFIG_KEXEC
static unsigned long acpi_rsdp;
static int __init setup_acpi_rsdp(char *arg)
{
acpi_rsdp = simple_strtoul(arg, NULL, 16);
return 0;
}
early_param("acpi_rsdp", setup_acpi_rsdp);
#endif
acpi_physical_address __init acpi_os_get_root_pointer(void)
{
#ifdef CONFIG_KEXEC
if (acpi_rsdp)
return acpi_rsdp;
#endif
if (efi_enabled) {
if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
return efi.acpi20;
......
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