From: Masayoshi Mizuma <[email protected]> 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.
Signed-off-by: Masayoshi Mizuma <[email protected]> --- 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 f088f5881..cc3938d68 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 c895df548..6efad338b 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 */ -- 2.18.1
