215 lines
5.8 KiB
Diff
215 lines
5.8 KiB
Diff
Subject: [PATCH] m68k: runtime patching infrastructure
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From: Roman Zippel <zippel@linux-m68k.org>
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Add the basic infrastructure to allow runtime patching of kernel and
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modules to optimize a few functions with parameters, which are only
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calculated once during bootup and are otherwise constant.
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Use this for the conversion between virtual and physical addresses.
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Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
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Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
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---
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arch/m68k/Makefile | 1 +
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arch/m68k/kernel/module.c | 24 +++++++++++++++++++++++-
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arch/m68k/kernel/module.lds | 7 +++++++
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arch/m68k/kernel/vmlinux-std.lds | 5 +++++
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arch/m68k/kernel/vmlinux-sun3.lds | 5 +++++
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arch/m68k/mm/motorola.c | 3 +++
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include/asm-m68k/module.h | 33 ++++++++++++++++++++++++++++++++-
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include/asm-m68k/page.h | 29 ++++++++++++++++++++++++++---
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8 files changed, 102 insertions(+), 5 deletions(-)
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--- linux-m68k-2.6.21.orig/arch/m68k/Makefile
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+++ linux-m68k-2.6.21/arch/m68k/Makefile
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@@ -19,6 +19,7 @@ COMPILE_ARCH = $(shell uname -m)
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# override top level makefile
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AS += -m68020
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LDFLAGS := -m m68kelf
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+LDFLAGS_MODULE += -T $(srctree)/arch/m68k/kernel/module.lds
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ifneq ($(COMPILE_ARCH),$(ARCH))
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# prefix for cross-compiling binaries
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CROSS_COMPILE = m68k-linux-gnu-
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--- linux-m68k-2.6.21.orig/arch/m68k/kernel/module.c
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+++ linux-m68k-2.6.21/arch/m68k/kernel/module.c
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@@ -1,3 +1,9 @@
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+/*
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+ * This file is subject to the terms and conditions of the GNU General Public
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+ * License. See the file COPYING in the main directory of this archive
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+ * for more details.
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+ */
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+
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#include <linux/moduleloader.h>
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#include <linux/elf.h>
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#include <linux/vmalloc.h>
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@@ -116,10 +122,26 @@ int apply_relocate_add(Elf32_Shdr *sechd
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return 0;
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}
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+void module_fixup(struct module *mod, struct m68k_fixup_info *start,
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+ struct m68k_fixup_info *end)
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+{
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+ struct m68k_fixup_info *fixup;
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+
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+ for (fixup = start; fixup < end; fixup++) {
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+ switch (fixup->type) {
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+ case m68k_fixup_memoffset:
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+ *(u32 *)fixup->addr = m68k_memoffset;
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+ break;
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+ }
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+ }
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+}
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+
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int module_finalize(const Elf_Ehdr *hdr,
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const Elf_Shdr *sechdrs,
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- struct module *me)
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+ struct module *mod)
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{
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+ module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end);
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+
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return 0;
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}
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--- /dev/null
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+++ linux-m68k-2.6.21/arch/m68k/kernel/module.lds
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@@ -0,0 +1,7 @@
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+SECTIONS {
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+ .m68k_fixup : {
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+ __start_fixup = .;
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+ *(.m68k_fixup)
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+ __stop_fixup = .;
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+ }
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+}
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--- linux-m68k-2.6.21.orig/arch/m68k/kernel/vmlinux-std.lds
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+++ linux-m68k-2.6.21/arch/m68k/kernel/vmlinux-std.lds
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@@ -60,6 +60,11 @@ SECTIONS
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__con_initcall_start = .;
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.con_initcall.init : { *(.con_initcall.init) }
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__con_initcall_end = .;
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+ .m68k_fixup : {
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+ __start_fixup = .;
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+ *(.m68k_fixup)
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+ __stop_fixup = .;
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+ }
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SECURITY_INIT
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#ifdef CONFIG_BLK_DEV_INITRD
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. = ALIGN(8192);
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--- linux-m68k-2.6.21.orig/arch/m68k/kernel/vmlinux-sun3.lds
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+++ linux-m68k-2.6.21/arch/m68k/kernel/vmlinux-sun3.lds
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@@ -54,6 +54,11 @@ __init_begin = .;
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__con_initcall_start = .;
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.con_initcall.init : { *(.con_initcall.init) }
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__con_initcall_end = .;
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+ .m68k_fixup : {
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+ __start_fixup = .;
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+ *(.m68k_fixup)
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+ __stop_fixup = .;
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+ }
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SECURITY_INIT
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#ifdef CONFIG_BLK_DEV_INITRD
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. = ALIGN(8192);
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--- linux-m68k-2.6.21.orig/arch/m68k/mm/motorola.c
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+++ linux-m68k-2.6.21/arch/m68k/mm/motorola.c
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@@ -222,6 +222,9 @@ void __init paging_init(void)
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pgprot_val(protection_map[i]) |= _PAGE_CACHE040;
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}
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+ module_fixup(NULL, __start_fixup, __stop_fixup);
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+ flush_icache();
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+
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/*
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* Map the physical memory available into the kernel virtual
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* address space. It may allocate some memory for page
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--- linux-m68k-2.6.21.orig/include/asm-m68k/module.h
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+++ linux-m68k-2.6.21/include/asm-m68k/module.h
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@@ -1,7 +1,38 @@
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#ifndef _ASM_M68K_MODULE_H
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#define _ASM_M68K_MODULE_H
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-struct mod_arch_specific { };
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+
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+struct mod_arch_specific {
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+ struct m68k_fixup_info *fixup_start, *fixup_end;
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+};
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+
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+#define MODULE_ARCH_INIT { \
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+ .fixup_start = __start_fixup, \
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+ .fixup_end = __stop_fixup, \
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+}
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+
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#define Elf_Shdr Elf32_Shdr
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#define Elf_Sym Elf32_Sym
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#define Elf_Ehdr Elf32_Ehdr
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+
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+
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+enum m68k_fixup_type {
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+ m68k_fixup_memoffset,
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+};
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+
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+struct m68k_fixup_info {
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+ enum m68k_fixup_type type;
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+ void *addr;
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+};
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+
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+#define m68k_fixup(type, addr) \
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+ " .section \".m68k_fixup\",\"aw\"\n" \
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+ " .long " #type "," #addr "\n" \
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+ " .previous\n"
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+
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+extern struct m68k_fixup_info __start_fixup[], __stop_fixup[];
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+
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+struct module;
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+extern void module_fixup(struct module *mod, struct m68k_fixup_info *start,
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+ struct m68k_fixup_info *end);
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+
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#endif /* _ASM_M68K_MODULE_H */
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--- linux-m68k-2.6.21.orig/include/asm-m68k/page.h
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+++ linux-m68k-2.6.21/include/asm-m68k/page.h
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@@ -27,6 +27,8 @@
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#ifndef __ASSEMBLY__
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+#include <asm/module.h>
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+
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#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
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#define free_user_page(page, addr) free_page(addr)
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@@ -114,14 +116,35 @@ typedef struct { unsigned long pgprot; }
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#ifndef __ASSEMBLY__
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+extern unsigned long m68k_memoffset;
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+
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#ifndef CONFIG_SUN3
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#define WANT_PAGE_VIRTUAL
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#ifdef CONFIG_SINGLE_MEMORY_CHUNK
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-extern unsigned long m68k_memoffset;
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-#define __pa(vaddr) ((unsigned long)(vaddr)+m68k_memoffset)
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-#define __va(paddr) ((void *)((unsigned long)(paddr)-m68k_memoffset))
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+static inline unsigned long ___pa(void *vaddr)
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+{
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+ unsigned long paddr;
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+ asm (
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+ "1: addl #0,%0\n"
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+ m68k_fixup(%c2, 1b+2)
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+ : "=r" (paddr)
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+ : "0" (vaddr), "i" (m68k_fixup_memoffset));
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+ return paddr;
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+}
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+#define __pa(vaddr) ___pa((void *)(vaddr))
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+static inline void *__va(unsigned long paddr)
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+{
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+ void *vaddr;
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+ asm (
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+ "1: subl #0,%0\n"
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+ m68k_fixup(%c2, 1b+2)
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+ : "=r" (vaddr)
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+ : "0" (paddr), "i" (m68k_fixup_memoffset));
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+ return vaddr;
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+}
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+
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#else
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#define __pa(vaddr) virt_to_phys((void *)(vaddr))
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#define __va(paddr) phys_to_virt((unsigned long)(paddr))
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