unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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x86: clean up setup.h and the boot code

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Make <asm/setup.h> usable by the boot code.

Clean up vestiges of the old command-line protocol from setup.h and
head_32.S (it is still supported from the boot loader point of
view, since it is converted to the new command-line protocol by the
boot code.)

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
H. Peter Anvin 2007-10-23 22:37:25 +02:00 committed by Thomas Gleixner
parent 0de80bcc2b
commit fa76dab935
4 changed files with 11 additions and 17 deletions
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2
arch/x86/boot/boot.h
View file

@ -23,7 +23,7 @@
#include <linux/types.h>
#include <linux/edd.h>
#include <asm/boot.h>
#include <asm/bootparam.h>
#include <asm/setup.h>
/* Useful macros */
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))

2
arch/x86/boot/main.c
View file

@ -26,8 +26,6 @@ char *heap_end = _end; /* Default end of heap = no heap */
* screws up the old-style command line protocol, adjust by
* filling in the new-style command line pointer instead.
*/
#define OLD_CL_MAGIC 0xA33F
#define OLD_CL_ADDRESS 0x20
static void copy_boot_params(void)
{

7
arch/x86/kernel/head_32.S
View file

@ -124,12 +124,7 @@ ENTRY(startup_32)
movsl
movl boot_params - __PAGE_OFFSET + NEW_CL_POINTER,%esi
andl %esi,%esi
jnz 2f # New command line protocol
cmpw $(OLD_CL_MAGIC),OLD_CL_MAGIC_ADDR
jne 1f
movzwl OLD_CL_OFFSET,%esi
addl $(OLD_CL_BASE_ADDR),%esi
2:
jz 1f # No comand line
movl $(boot_command_line - __PAGE_OFFSET),%edi
movl $(COMMAND_LINE_SIZE/4),%ecx
rep

17
include/asm-x86/setup.h
View file

@ -14,19 +14,19 @@
#define MAXMEM_PFN PFN_DOWN(MAXMEM)
#define MAX_NONPAE_PFN (1 << 20)
#define PARAM_SIZE 4096
#define OLD_CL_MAGIC_ADDR 0x90020
#define OLD_CL_MAGIC 0xA33F
#define OLD_CL_BASE_ADDR 0x90000
#define OLD_CL_OFFSET 0x90022
#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
#endif /* __i386__ */
#define PARAM_SIZE 4096 /* sizeof(struct boot_params) */
#define OLD_CL_MAGIC 0xA33F
#define OLD_CL_ADDRESS 0x020 /* Relative to real mode data */
#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
#ifndef __ASSEMBLY__
#include <asm/bootparam.h>
#ifndef _SETUP
/*
* This is set up by the setup-routine at boot-time
*/
@ -56,6 +56,7 @@ extern unsigned long init_pg_tables_end;
#endif
#endif /* __i386__ */
#endif /* _SETUP */
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */