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| author | Juergen Gross <jgross@suse.com> | 2018-11-20 08:25:29 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-11-20 09:43:11 +0100 |
| commit | e6e094e053af75cbc164e950814d3d084fb1e698 (patch) | |
| tree | c36f72645677611b5710ffe9f3b010c1f0b012a8 | |
| parent | 3841840449817ba6cf3e636008bc4e1061a03388 (diff) | |
| download | linux-e6e094e053af75cbc164e950814d3d084fb1e698.tar.gz linux-e6e094e053af75cbc164e950814d3d084fb1e698.tar.bz2 linux-e6e094e053af75cbc164e950814d3d084fb1e698.zip | |
x86/acpi, x86/boot: Take RSDP address from boot params if available
In case the RSDP address in struct boot_params is specified don't try
to find the table by searching, but take the address directly as set
by the boot loader.
Suggested-by: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: boris.ostrovsky@oracle.com
Cc: bp@alien8.de
Cc: daniel.kiper@oracle.com
Cc: sstabellini@kernel.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/20181120072529.5489-3-jgross@suse.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | arch/x86/include/uapi/asm/bootparam.h | 3 | ||||
| -rw-r--r-- | arch/x86/kernel/acpi/boot.c | 2 |
2 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h index a06cbf019744..60733f137e9a 100644 --- a/arch/x86/include/uapi/asm/bootparam.h +++ b/arch/x86/include/uapi/asm/bootparam.h @@ -155,7 +155,8 @@ struct boot_params { __u8 _pad2[4]; /* 0x054 */ __u64 tboot_addr; /* 0x058 */ struct ist_info ist_info; /* 0x060 */ - __u8 _pad3[16]; /* 0x070 */ + __u64 acpi_rsdp_addr; /* 0x070 */ + __u8 _pad3[8]; /* 0x078 */ __u8 hd0_info[16]; /* obsolete! */ /* 0x080 */ __u8 hd1_info[16]; /* obsolete! */ /* 0x090 */ struct sys_desc_table sys_desc_table; /* obsolete! */ /* 0x0a0 */ diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index fb3b1f3a5aba..06635fbca81c 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -1776,5 +1776,5 @@ void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size) u64 x86_default_get_root_pointer(void) { - return 0; + return boot_params.acpi_rsdp_addr; } |