* [PATCH v2 0/3] x86: make rsdp address accessible via boot params
@ 2017-12-07 12:28 Juergen Gross
0 siblings, 0 replies; 2+ messages in thread
From: Juergen Gross @ 2017-12-07 12:28 UTC (permalink / raw)
To: linux-kernel, xen-devel, x86
Cc: Juergen Gross, corbet, rjw, linux-acpi, mingo, hpa,
boris.ostrovsky, tglx, lenb
In the non-EFI boot path the ACPI RSDP table is currently found via
either EBDA or by searching through low memory for the RSDP magic.
This requires the RSDP to be located in the first 1MB of physical
memory. Xen PVH guests, however, get the RSDP address via the start of
day information block.
In order to support an arbitrary RSDP address this patch series adds
the physical address of the RSDP to the boot params structure filled
by the boot loader. A kernel booted directly in PVH mode can save the
RSDP address in the boot params, while a kernel booted in PVH mode via
grub can rely on the RSDP address being specified by grub2 (which in
turn got the address via the start of day information block from Xen).
Juergen Gross (3):
x86/boot: add acpi rsdp address to setup_header
x86/acpi: take rsdp address for boot params if available
x86/xen: supply rsdp address in boot params for pvh guests
Documentation/x86/boot.txt | 19 +++++++++++++++++++
arch/x86/boot/header.S | 6 +++++-
arch/x86/include/uapi/asm/bootparam.h | 1 +
arch/x86/xen/enlighten_pvh.c | 5 ++++-
drivers/acpi/osl.c | 8 ++++++++
5 files changed, 37 insertions(+), 2 deletions(-)
--
2.12.3
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^ permalink raw reply [flat|nested] 2+ messages in thread
* [PATCH v2 0/3] x86: make rsdp address accessible via boot params
@ 2017-12-07 12:28 Juergen Gross
0 siblings, 0 replies; 2+ messages in thread
From: Juergen Gross @ 2017-12-07 12:28 UTC (permalink / raw)
To: linux-kernel, xen-devel, x86
Cc: boris.ostrovsky, hpa, tglx, mingo, corbet, rjw, lenb, linux-acpi,
Juergen Gross
In the non-EFI boot path the ACPI RSDP table is currently found via
either EBDA or by searching through low memory for the RSDP magic.
This requires the RSDP to be located in the first 1MB of physical
memory. Xen PVH guests, however, get the RSDP address via the start of
day information block.
In order to support an arbitrary RSDP address this patch series adds
the physical address of the RSDP to the boot params structure filled
by the boot loader. A kernel booted directly in PVH mode can save the
RSDP address in the boot params, while a kernel booted in PVH mode via
grub can rely on the RSDP address being specified by grub2 (which in
turn got the address via the start of day information block from Xen).
Juergen Gross (3):
x86/boot: add acpi rsdp address to setup_header
x86/acpi: take rsdp address for boot params if available
x86/xen: supply rsdp address in boot params for pvh guests
Documentation/x86/boot.txt | 19 +++++++++++++++++++
arch/x86/boot/header.S | 6 +++++-
arch/x86/include/uapi/asm/bootparam.h | 1 +
arch/x86/xen/enlighten_pvh.c | 5 ++++-
drivers/acpi/osl.c | 8 ++++++++
5 files changed, 37 insertions(+), 2 deletions(-)
--
2.12.3
^ permalink raw reply [flat|nested] 2+ messages in thread
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