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m68k: runtime patching infrastructure

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Add the basic infrastructure to allow runtime patching of kernel and modules
to optimize a few functions with parameters, which are only calculated once
during bootup and are otherwise constant.  Use this for the conversion between
virtual and physical addresses.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roman Zippel 2007-05-31 00:40:50 -07:00 • committed by Linus Torvalds
commit fbe9c96129
9 changed files with 107 additions and 7 deletions
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33
include/asm-m68k/module.h
View file

@ -1,7 +1,38 @@
#ifndef _ASM_M68K_MODULE_H
#define _ASM_M68K_MODULE_H
struct mod_arch_specific { };
struct mod_arch_specific {
struct m68k_fixup_info *fixup_start, *fixup_end;
};
#define MODULE_ARCH_INIT { \
.fixup_start = __start_fixup, \
.fixup_end = __stop_fixup, \
}
#define Elf_Shdr Elf32_Shdr
#define Elf_Sym Elf32_Sym
#define Elf_Ehdr Elf32_Ehdr
enum m68k_fixup_type {
m68k_fixup_memoffset,
};
struct m68k_fixup_info {
enum m68k_fixup_type type;
void *addr;
};
#define m68k_fixup(type, addr) \
" .section \".m68k_fixup\",\"aw\"\n" \
" .long " #type "," #addr "\n" \
" .previous\n"
extern struct m68k_fixup_info __start_fixup[], __stop_fixup[];
struct module;
extern void module_fixup(struct module *mod, struct m68k_fixup_info *start,
struct m68k_fixup_info *end);
#endif /* _ASM_M68K_MODULE_H */

29
include/asm-m68k/page.h
View file

@ -27,6 +27,8 @@
#ifndef __ASSEMBLY__
#include <asm/module.h>
#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
#define free_user_page(page, addr) free_page(addr)
@ -114,14 +116,35 @@ typedef struct { unsigned long pgprot; } pgprot_t;
#ifndef __ASSEMBLY__
extern unsigned long m68k_memoffset;
#ifndef CONFIG_SUN3
#define WANT_PAGE_VIRTUAL
#ifdef CONFIG_SINGLE_MEMORY_CHUNK
extern unsigned long m68k_memoffset;
#define __pa(vaddr) ((unsigned long)(vaddr)+m68k_memoffset)
#define __va(paddr) ((void *)((unsigned long)(paddr)-m68k_memoffset))
static inline unsigned long ___pa(void *vaddr)
{
unsigned long paddr;
asm (
"1: addl #0,%0\n"
m68k_fixup(%c2, 1b+2)
: "=r" (paddr)
: "0" (vaddr), "i" (m68k_fixup_memoffset));
return paddr;
}
#define __pa(vaddr) ___pa((void *)(vaddr))
static inline void *__va(unsigned long paddr)
{
void *vaddr;
asm (
"1: subl #0,%0\n"
m68k_fixup(%c2, 1b+2)
: "=r" (vaddr)
: "0" (paddr), "i" (m68k_fixup_memoffset));
return vaddr;
}
#else
#define __pa(vaddr) virt_to_phys((void *)(vaddr))
#define __va(paddr) phys_to_virt((unsigned long)(paddr))