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Subject[PATCH v6 2/4] x86/boot: Add max_addr field in struct boot_params
Date
From: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>

Add max_addr field in struct boot_params. max_addr shows the
maximum memory address to be reachable by memory hot-add.
max_addr is set by parsing ACPI SRAT.

Reviewed-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
---
Documentation/x86/zero-page.rst | 4 ++++
arch/x86/include/uapi/asm/bootparam.h | 2 +-
2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/x86/zero-page.rst b/Documentation/x86/zero-page.rst
index f088f5881666..cc3938d68481 100644
--- a/Documentation/x86/zero-page.rst
+++ b/Documentation/x86/zero-page.rst
@@ -19,6 +19,7 @@ Offset/Size Proto Name Meaning
058/008 ALL tboot_addr Physical address of tboot shared page
060/010 ALL ist_info Intel SpeedStep (IST) BIOS support information
(struct ist_info)
+078/010 ALL max_addr The possible maximum physical memory address [1]_
080/010 ALL hd0_info hd0 disk parameter, OBSOLETE!!
090/010 ALL hd1_info hd1 disk parameter, OBSOLETE!!
0A0/010 ALL sys_desc_table System description table (struct sys_desc_table),
@@ -43,3 +44,6 @@ Offset/Size Proto Name Meaning
(array of struct e820_entry)
D00/1EC ALL eddbuf EDD data (array of struct edd_info)
=========== ===== ======================= =================================================
+
+.. [1] max_addr shows the maximum memory address to be reachable by memory
+ hot-add. max_addr is set by parsing ACPI SRAT.
diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
index c895df5482c5..6efad338bba9 100644
--- a/arch/x86/include/uapi/asm/bootparam.h
+++ b/arch/x86/include/uapi/asm/bootparam.h
@@ -158,7 +158,7 @@ struct boot_params {
__u64 tboot_addr; /* 0x058 */
struct ist_info ist_info; /* 0x060 */
__u64 acpi_rsdp_addr; /* 0x070 */
- __u8 _pad3[8]; /* 0x078 */
+ __u64 max_addr; /* 0x078 */
__u8 hd0_info[16]; /* obsolete! */ /* 0x080 */
__u8 hd1_info[16]; /* obsolete! */ /* 0x090 */
struct sys_desc_table sys_desc_table; /* obsolete! */ /* 0x0a0 */
--
2.20.1
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