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authorHuang, Ying <ying.huang@intel.com>2008-03-28 10:49:44 +0800
committerIngo Molnar <mingo@elte.hu>2008-04-26 21:34:42 +0200
commit8b664aa66e824a0ddf4ec56d41fa0cf7bb374de6 (patch)
tree57c5de72c38f630e126964b922c379c4a7e49100 /arch/x86
parent50eae2a7c9862afe263a2003c12f457ecfc9e6a2 (diff)
x86, boot: add linked list of struct setup_data
This patch adds a field of 64-bit physical pointer to NULL terminated single linked list of struct setup_data to real-mode kernel header. This is used as a more extensible boot parameters passing mechanism. Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/boot/header.S6
-rw-r--r--arch/x86/kernel/head64.c20
-rw-r--r--arch/x86/kernel/setup_64.c22
3 files changed, 47 insertions, 1 deletions
diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index 6d2df8d61c5..af86e431acf 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -120,7 +120,7 @@ _start:
# Part 2 of the header, from the old setup.S
.ascii "HdrS" # header signature
- .word 0x0208 # header version number (>= 0x0105)
+ .word 0x0209 # header version number (>= 0x0105)
# or else old loadlin-1.5 will fail)
.globl realmode_swtch
realmode_swtch: .word 0, 0 # default_switch, SETUPSEG
@@ -227,6 +227,10 @@ hardware_subarch_data: .quad 0
payload_offset: .long input_data
payload_length: .long input_data_end-input_data
+setup_data: .quad 0 # 64-bit physical pointer to
+ # single linked list of
+ # struct setup_data
+
# End of setup header #####################################################
.section ".inittext", "ax"
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index d31d6b72d60..e25c57b8aa8 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -11,6 +11,7 @@
#include <linux/string.h>
#include <linux/percpu.h>
#include <linux/start_kernel.h>
+#include <linux/io.h>
#include <asm/processor.h>
#include <asm/proto.h>
@@ -100,6 +101,24 @@ static void __init reserve_ebda_region(void)
reserve_early(lowmem, 0x100000, "BIOS reserved");
}
+static void __init reserve_setup_data(void)
+{
+ struct setup_data *data;
+ unsigned long pa_data;
+ char buf[32];
+
+ if (boot_params.hdr.version < 0x0209)
+ return;
+ pa_data = boot_params.hdr.setup_data;
+ while (pa_data) {
+ data = early_ioremap(pa_data, sizeof(*data));
+ sprintf(buf, "setup data %x", data->type);
+ reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
+ pa_data = data->next;
+ early_iounmap(data, sizeof(*data));
+ }
+}
+
void __init x86_64_start_kernel(char * real_mode_data)
{
int i;
@@ -156,6 +175,7 @@ void __init x86_64_start_kernel(char * real_mode_data)
#endif
reserve_ebda_region();
+ reserve_setup_data();
/*
* At this point everything still needed from the boot loader
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 17bdf234309..e1a21d6b367 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -264,6 +264,26 @@ void __attribute__((weak)) __init memory_setup(void)
machine_specific_memory_setup();
}
+static void __init parse_setup_data(void)
+{
+ struct setup_data *data;
+ unsigned long pa_data;
+
+ if (boot_params.hdr.version < 0x0209)
+ return;
+ pa_data = boot_params.hdr.setup_data;
+ while (pa_data) {
+ data = early_ioremap(pa_data, PAGE_SIZE);
+ switch (data->type) {
+ default:
+ break;
+ }
+ free_early(pa_data, pa_data+sizeof(*data)+data->len);
+ pa_data = data->next;
+ early_iounmap(data, PAGE_SIZE);
+ }
+}
+
/*
* setup_arch - architecture-specific boot-time initializations
*
@@ -316,6 +336,8 @@ void __init setup_arch(char **cmdline_p)
strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
*cmdline_p = command_line;
+ parse_setup_data();
+
parse_early_param();
#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT