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Date: Thu, 13 Jun 2013 21:02:56 +0800
From: Tang Chen <tangchen@...fujitsu.com>
To: tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
akpm@...ux-foundation.org, tj@...nel.org, trenn@...e.de,
yinghai@...nel.org, jiang.liu@...wei.com, wency@...fujitsu.com,
laijs@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
mgorman@...e.de, minchan@...nel.org, mina86@...a86.com,
gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com,
lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com,
prarit@...hat.com
Cc: x86@...nel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Pekka Enberg <penberg@...nel.org>,
Jacob Shin <jacob.shin@....com>,
"Rafael J. Wysocki" <rjw@...k.pl>, linux-acpi@...r.kernel.org
Subject: [Part1 PATCH v5 09/22] x86, ACPI: Find acpi tables in initrd early from head_32.S/head64.c
From: Yinghai Lu <yinghai@...nel.org>
head64.c could use #PF handler setup page table to access initrd before
init mem mapping and initrd relocating.
head_32.S could use 32bit flat mode to access initrd before init mem
mapping initrd relocating.
This patch introduces x86_acpi_override_find(), which is called from
head_32.S/head64.c, to replace acpi_initrd_override_find(). So that we
can makes 32bit and 64 bit more consistent.
-v2: use inline function in header file instead according to tj.
also still need to keep #idef head_32.S to avoid compiling error.
-v3: need to move down reserve_initrd() after acpi_initrd_override_copy(),
to make sure we are using right address.
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: Jacob Shin <jacob.shin@....com>
Cc: Rafael J. Wysocki <rjw@...k.pl>
Cc: linux-acpi@...r.kernel.org
Tested-by: Thomas Renninger <trenn@...e.de>
Reviewed-by: Tang Chen <tangchen@...fujitsu.com>
Tested-by: Tang Chen <tangchen@...fujitsu.com>
---
arch/x86/include/asm/setup.h | 6 ++++++
arch/x86/kernel/head64.c | 2 ++
arch/x86/kernel/head_32.S | 4 ++++
arch/x86/kernel/setup.c | 34 ++++++++++++++++++++++++++++++----
4 files changed, 42 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index 4f71d48..6f885b7 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -42,6 +42,12 @@ extern void visws_early_detect(void);
static inline void visws_early_detect(void) { }
#endif
+#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
+void x86_acpi_override_find(void);
+#else
+static inline void x86_acpi_override_find(void) { }
+#endif
+
extern unsigned long saved_video_mode;
extern void reserve_standard_io_resources(void);
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 55b6761..229b281 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -175,6 +175,8 @@ void __init x86_64_start_kernel(char * real_mode_data)
if (console_loglevel == 10)
early_printk("Kernel alive\n");
+ x86_acpi_override_find();
+
clear_page(init_level4_pgt);
/* set init_level4_pgt kernel high mapping*/
init_level4_pgt[511] = early_level4_pgt[511];
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 73afd11..ca08f0e 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -149,6 +149,10 @@ ENTRY(startup_32)
call load_ucode_bsp
#endif
+#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
+ call x86_acpi_override_find
+#endif
+
/*
* Initialize page tables. This creates a PDE and a set of page
* tables, which are located immediately beyond __brk_base. The variable
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 142e042..d11b1b7 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -421,6 +421,34 @@ static void __init reserve_initrd(void)
}
#endif /* CONFIG_BLK_DEV_INITRD */
+#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
+void __init x86_acpi_override_find(void)
+{
+ unsigned long ramdisk_image, ramdisk_size;
+ unsigned char *p = NULL;
+
+#ifdef CONFIG_X86_32
+ struct boot_params *boot_params_p;
+
+ /*
+ * 32bit is from head_32.S, and it is 32bit flat mode.
+ * So need to use phys address to access global variables.
+ */
+ boot_params_p = (struct boot_params *)__pa_nodebug(&boot_params);
+ ramdisk_image = get_ramdisk_image(boot_params_p);
+ ramdisk_size = get_ramdisk_size(boot_params_p);
+ p = (unsigned char *)ramdisk_image;
+ acpi_initrd_override_find(p, ramdisk_size, true);
+#else
+ ramdisk_image = get_ramdisk_image(&boot_params);
+ ramdisk_size = get_ramdisk_size(&boot_params);
+ if (ramdisk_image)
+ p = __va(ramdisk_image);
+ acpi_initrd_override_find(p, ramdisk_size, false);
+#endif
+}
+#endif
+
static void __init parse_setup_data(void)
{
struct setup_data *data;
@@ -1117,12 +1145,10 @@ void __init setup_arch(char **cmdline_p)
/* Allocate bigger log buffer */
setup_log_buf(1);
- reserve_initrd();
-
- acpi_initrd_override_find((void *)initrd_start,
- initrd_end - initrd_start, false);
acpi_initrd_override_copy();
+ reserve_initrd();
+
reserve_crashkernel();
vsmp_init();
--
1.7.1
--
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