AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

[PATCH] x86-64: modify copy_bootdata to use virtual addresses

Browse Source 
Use virtual addresses instead of physical addresses
in copy bootdata.  In addition fix the implementation
of the old bootloader convention.  Everything is
at real_mode_data always.  It is just that sometimes
real_mode_data was relocated by setup.S to not sit at
0x90000.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Vivek Goyal 2007-05-02 19:27:07 +02:00 committed by Andi Kleen
parent 93fd755e47
commit 278c0eb7f9
1 changed files with 8 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
arch/x86_64/kernel/head64.c
View File

@ -29,25 +29,24 @@ static void __init clear_bss(void)
}
#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
#define OLD_CL_MAGIC_ADDR 0x90020
#define OLD_CL_MAGIC_ADDR 0x20
#define OLD_CL_MAGIC 0xA33F
#define OLD_CL_BASE_ADDR 0x90000
#define OLD_CL_OFFSET 0x90022
#define OLD_CL_OFFSET 0x22
static void __init copy_bootdata(char *real_mode_data)
{
int new_data;
unsigned long new_data;
char * command_line;
memcpy(x86_boot_params, real_mode_data, BOOT_PARAM_SIZE);
new_data = *(int *) (x86_boot_params + NEW_CL_POINTER);
new_data = *(u32 *) (x86_boot_params + NEW_CL_POINTER);
if (!new_data) {
if (OLD_CL_MAGIC != * (u16 *) OLD_CL_MAGIC_ADDR) {
if (OLD_CL_MAGIC != *(u16 *)(real_mode_data + OLD_CL_MAGIC_ADDR)) {
return;
}
new_data = OLD_CL_BASE_ADDR + * (u16 *) OLD_CL_OFFSET;
new_data = __pa(real_mode_data) + *(u16 *)(real_mode_data + OLD_CL_OFFSET);
}
command_line = (char *) ((u64)(new_data));
command_line = __va(new_data);
memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
}
@ -74,7 +73,7 @@ void __init x86_64_start_kernel(char * real_mode_data)
cpu_pda(i) = &boot_cpu_pda[i];
pda_init(0);
copy_bootdata(real_mode_data);
copy_bootdata(__va(real_mode_data));
#ifdef CONFIG_SMP
cpu_set(0, cpu_online_map);
#endif