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Subject[PATCH 6/20] x86_64: Modify copy bootdata to use virtual addresses


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>
---

arch/x86_64/kernel/head64.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)

diff -puN arch/x86_64/kernel/head64.c~x86_64-modify-copy_bootdata-to-use-virtual-addresses arch/x86_64/kernel/head64.c
--- linux-2.6.19-rc6-reloc/arch/x86_64/kernel/head64.c~x86_64-modify-copy_bootdata-to-use-virtual-addresses 2006-11-17 00:07:30.000000000 -0500
+++ linux-2.6.19-rc6-reloc-root/arch/x86_64/kernel/head64.c 2006-11-17 00:07:30.000000000 -0500
@@ -29,27 +29,26 @@ 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

extern char saved_command_line[];

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(saved_command_line, command_line, COMMAND_LINE_SIZE);
}

@@ -74,7 +73,7 @@ void __init x86_64_start_kernel(char * r
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
_
-
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