From: Chao Fan <fanc.fnst@cn.fujitsu.com>
To: <linux-kernel@vger.kernel.org>, <x86@kernel.org>,
<linux-efi@vger.kernel.org>, <linux-acpi@vger.kernel.org>,
<bp@alien8.de>, <tglx@linutronix.de>, <mingo@redhat.com>,
<hpa@zytor.com>, <keescook@chromium.org>, <bhe@redhat.com>,
<msys.mizuma@gmail.com>
Cc: <indou.takao@jp.fujitsu.com>, <caoj.fnst@cn.fujitsu.com>,
<fanc.fnst@cn.fujitsu.com>
Subject: [PATCH v9 5/8] x86/boot: Add get_acpi_rsdp() to parse RSDP in cmdlien from kexec
Date: Wed, 17 Oct 2018 18:20:09 +0800 [thread overview]
Message-ID: <20181017102012.872-6-fanc.fnst@cn.fujitsu.com> (raw)
In-Reply-To: <20181017102012.872-1-fanc.fnst@cn.fujitsu.com>
If KEXEC write the RSDP pointer to cmdline, parse the cmdline
and use it.
Imitate from early_param of "acpi_rsdp".
Signed-off-by: Chao Fan <fanc.fnst@cn.fujitsu.com>
---
arch/x86/boot/compressed/acpitb.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/arch/x86/boot/compressed/acpitb.c b/arch/x86/boot/compressed/acpitb.c
index 50fa65cf824d..37b1f4407be8 100644
--- a/arch/x86/boot/compressed/acpitb.c
+++ b/arch/x86/boot/compressed/acpitb.c
@@ -8,6 +8,9 @@
#include <linux/numa.h>
#include <linux/acpi.h>
+#define STATIC
+#include <linux/decompress/mm.h>
+
/* Search EFI table for RSDP table. */
static void efi_get_rsdp_addr(acpi_physical_address *rsdp_addr)
{
@@ -200,3 +203,23 @@ static void bios_get_rsdp_addr(acpi_physical_address *rsdp_addr)
*rsdp_addr = (acpi_physical_address)address;
}
}
+
+static void get_acpi_rsdp(acpi_physical_address *rsdp_addr)
+{
+#ifdef CONFIG_KEXEC
+ unsigned long long res;
+ int len = 0;
+ char *val;
+
+ val = malloc(20);
+ len = cmdline_find_option("acpi_rsdp", val, 20);
+
+ if (len == -1)
+ return;
+
+ if (len > 0) {
+ val[len] = 0;
+ *rsdp_addr = (acpi_physical_address)kstrtoull(val, 0, &res);
+ }
+#endif
+}
--
2.17.2
next prev parent reply other threads:[~2018-10-17 10:21 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-17 10:20 [PATCH v9 0/8] x86/boot/KASLR: Parse ACPI table and limit kaslr in immovable memory Chao Fan
2018-10-17 10:20 ` [PATCH v9 1/8] x86/boot: Introduce cmdline_find_option_arg()to detect if option=arg in cmdline Chao Fan
2018-10-18 4:01 ` Baoquan He
2018-10-18 6:15 ` Chao Fan
2018-10-17 10:20 ` [PATCH v9 2/8] x86/boot: Copy kstrtoull() to compressed period Chao Fan
2018-10-18 4:03 ` Baoquan He
2018-10-18 5:51 ` Chao Fan
2018-10-18 6:01 ` Baoquan He
2018-10-18 6:08 ` Chao Fan
2018-10-17 10:20 ` [PATCH v9 3/8] x86/boot: Add efi_get_rsdp_addr() to dig out RSDP from EFI table Chao Fan
2018-10-18 4:35 ` Baoquan He
2018-10-18 5:54 ` Chao Fan
2018-10-18 5:56 ` Baoquan He
2018-10-18 6:10 ` Chao Fan
2018-10-17 10:20 ` [PATCH v9 4/8] x86/boot: Add bios_get_rsdp_addr() to search RSDP in memory Chao Fan
2018-10-17 10:20 ` Chao Fan [this message]
2018-10-21 2:26 ` [PATCH v9 5/8] x86/boot: Add get_acpi_rsdp() to parse RSDP in cmdlien from kexec Baoquan He
2018-10-22 5:30 ` Fan, Chao
2018-10-22 6:06 ` Baoquan He
2018-10-22 7:30 ` Chao Fan
2018-10-22 7:36 ` Baoquan He
2018-10-17 10:20 ` [PATCH v9 6/8] x86/boot: Dig out SRAT table from RSDP and find immovable memory Chao Fan
2018-10-18 6:12 ` Chao Fan
2018-10-21 2:34 ` Baoquan He
2018-10-22 5:29 ` Fan, Chao
2018-10-22 6:08 ` Baoquan He
2018-10-17 10:20 ` [PATCH v9 7/8] x86/boot/KASLR: Walk srat tables to filter " Chao Fan
2018-10-18 4:23 ` Baoquan He
2018-10-18 5:56 ` Chao Fan
2018-10-17 10:20 ` [PATCH v9 8/8] x86/boot/KASLR: Limit kaslr to choosing the " Chao Fan
2018-10-18 4:21 ` Baoquan He
2018-10-22 10:13 ` Chao Fan
2018-10-22 10:24 ` Baoquan He
2018-10-22 10:49 ` Chao Fan
2018-10-18 3:59 ` [PATCH v9 0/8] x86/boot/KASLR: Parse ACPI table and limit kaslr in " Baoquan He
2018-10-18 5:48 ` Chao Fan
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