[PATCH v2 12/13] x86, boot: add fields to support load bzImage and ramdisk high
From: Yinghai Lu
Date: Sun Nov 18 2012 - 02:09:56 EST
ext_ramdisk_image/size will record high 32bits for ramdisk info.
code64_start_offset will be set for bzImage that support 64bit.
Let get_ramdisk_image/size to use ext_ramdisk_image/size to get
right positon for ramdisk.
bootloader will fill value to ext_ramdisk_image/size when it load
ramdisk high.
Also bootloader will check if code64_start_offset set to decicde if
it could load ramdisk high above 4G.
Update header version to 2.12.
-v2: add ext_cmd_line_ptr for above 4G support.
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Rob Landley <rob@xxxxxxxxxxx>
Cc: Matt Fleming <matt.fleming@xxxxxxxxx>
---
Documentation/x86/boot.txt | 39 ++++++++++++++++++++++++++++++++++++
arch/x86/boot/compressed/cmdline.c | 3 ++
arch/x86/boot/header.S | 8 ++++++-
arch/x86/include/asm/bootparam.h | 4 +++
arch/x86/kernel/head64.c | 3 ++
arch/x86/kernel/setup.c | 6 +++++
6 files changed, 62 insertions(+), 1 deletions(-)
diff --git a/Documentation/x86/boot.txt b/Documentation/x86/boot.txt
index 9efceff..bec29e1 100644
--- a/Documentation/x86/boot.txt
+++ b/Documentation/x86/boot.txt
@@ -57,6 +57,9 @@ Protocol 2.10: (Kernel 2.6.31) Added a protocol for relaxed alignment
Protocol 2.11: (Kernel 3.6) Added a field for offset of EFI handover
protocol entry point.
+Protocol 2.12: (Kernel 3.9) Added three fields for loading bzImage and
+ ramdisk above 4G with 64bit.
+
**** MEMORY LAYOUT
The traditional memory map for the kernel loader, used for Image or
@@ -193,6 +196,10 @@ Offset Proto Name Meaning
0258/8 2.10+ pref_address Preferred loading address
0260/4 2.10+ init_size Linear memory required during initialization
0264/4 2.11+ handover_offset Offset of handover entry point
+0268/4 2.12+ ext_ramdisk_image ramdisk_image 32 bits
+026C/4 2.12+ ext_ramdisk_size ramdisk_size high 32 bits
+0270/4 2.12+ code64_start_offset 64bit start offset for bzImage
+0274/4 2.12+ ext_cmd_line_ptr cmd_line_ptr high 32 bits
(1) For backwards compatibility, if the setup_sects field contains 0, the
real value is 4.
@@ -707,6 +714,38 @@ Offset/size: 0x264/4
See EFI HANDOVER PROTOCOL below for more details.
+Field name: ext_ramdisk_image
+Type: write
+Offset/size: 0x268/4
+Protocol: 2.12+
+
+ The high 32-bit linear address of the initial ramdisk or ramfs. Leave at
+ zero if there is no initial ramdisk/ramfs, or under 4G.
+
+Field name: ext_ramdisk_size
+Type: write
+Offset/size: 0x26c/4
+Protocol: 2.12+
+
+ High 32-bit size of the initial ramdisk or ramfs. Leave at zero if there
+ is no initial ramdisk/ramfs.
+
+Field name: code64_start_offset
+Type: modify (reloc)
+Offset/size: 0x270/4
+Protocol: 2.12+
+
+ The offset of 64bit code to start. It is offset to the load address
+ of the kernel, and can be used by the boot loader to determine if
+ the bzImage is for 64bit. 64bit loader could jump to load address
+ plus the offset directly.
+
+Field name: ext_cmd_line_ptr
+Type: write
+Offset/size: 0x274/4
+Protocol: 2.12+
+
+ cmd_line_ptr high 32 bits. Leave at zero if under 4G.
**** THE IMAGE CHECKSUM
diff --git a/arch/x86/boot/compressed/cmdline.c b/arch/x86/boot/compressed/cmdline.c
index b4c913c..00678d3 100644
--- a/arch/x86/boot/compressed/cmdline.c
+++ b/arch/x86/boot/compressed/cmdline.c
@@ -17,6 +17,9 @@ static unsigned long get_cmd_line_ptr(void)
{
unsigned long cmd_line_ptr = real_mode->hdr.cmd_line_ptr;
+ if (real_mode->hdr.version >= 0x020c)
+ cmd_line_ptr |= (u64)real_mode->hdr.ext_cmd_line_ptr << 32;
+
return cmd_line_ptr;
}
int cmdline_find_option(const char *option, char *buffer, int bufsize)
diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index 2a01744..0fcff87 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -279,7 +279,7 @@ _start:
# Part 2 of the header, from the old setup.S
.ascii "HdrS" # header signature
- .word 0x020b # header version number (>= 0x0105)
+ .word 0x020c # header version number (>= 0x0105)
# or else old loadlin-1.5 will fail)
.globl realmode_swtch
realmode_swtch: .word 0, 0 # default_switch, SETUPSEG
@@ -400,6 +400,12 @@ init_size: .long INIT_SIZE # kernel initialization size
handover_offset: .long 0x30 # offset to the handover
# protocol entry point
+ext_ramdisk_image: .long 0 # ramdisk_image high 32 bits
+ext_ramdisk_size: .long 0 # ramdisk_size high 32 bits
+code64_start_offset: .long BOOT_CODE64_START_OFFSET # startup_64 in
+ # arch/x86/boot/compressed/head_64.S
+ext_cmd_line_ptr: .long 0 # cmd_line_ptr high 32 bits.
+
# End of setup header #####################################################
.section ".entrytext", "ax"
diff --git a/arch/x86/include/asm/bootparam.h b/arch/x86/include/asm/bootparam.h
index 2ad874c..8068191 100644
--- a/arch/x86/include/asm/bootparam.h
+++ b/arch/x86/include/asm/bootparam.h
@@ -67,6 +67,10 @@ struct setup_header {
__u64 pref_address;
__u32 init_size;
__u32 handover_offset;
+ __u32 ext_ramdisk_image;
+ __u32 ext_ramdisk_size;
+ __u32 code64_start_offset;
+ __u32 ext_cmd_line_ptr;
} __attribute__((packed));
struct sys_desc_table {
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index ca00d73..e82001e 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -45,6 +45,9 @@ static unsigned long get_cmd_line_ptr(void)
{
unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
+ if (boot_params.hdr.version >= 0x020c)
+ cmd_line_ptr |= (u64)boot_params.hdr.ext_cmd_line_ptr << 32;
+
return cmd_line_ptr;
}
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 573fa7d7..6a0ffa3 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -302,12 +302,18 @@ static u64 __init get_ramdisk_image(void)
{
u64 ramdisk_image = boot_params.hdr.ramdisk_image;
+ if (boot_params.hdr.version >= 0x020c)
+ ramdisk_image |= (u64)boot_params.hdr.ext_ramdisk_image << 32;
+
return ramdisk_image;
}
static u64 __init get_ramdisk_size(void)
{
u64 ramdisk_size = boot_params.hdr.ramdisk_size;
+ if (boot_params.hdr.version >= 0x020c)
+ ramdisk_size |= (u64)boot_params.hdr.ext_ramdisk_size << 32;
+
return ramdisk_size;
}
--
1.7.7
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