Re: [Patch] Move multiboot helpers out of the kernel

[phcoder <phcoder@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 1475 bytes --]

Rediffed
2009-03-14  Vladimir Serbinenko  <phcoder@gmail.com>

      Move multiboot helper out of kernel

      * conf/i386-pc.rmk: Add loader/i386/multiboot_helper.S to
      _multiboot.mod
      * conf/i386-coreboot.rmk: Likewise
      * conf/i386-ieee1275.rmk: Likewise
      * kern/i386/loader.S: Move multiboot helpers from here...
      * loader/i386/multiboot_helper.S: ...moved here
      * include/grub/i386/loader.h: Move declarations of multiboot
      helpers from here...
      * include/grub/i386/multiboot.h: ...moved here
      * loader/i386/multiboot.c: Added include of
      grub/cpu/multiboot.h

phcoder wrote:
> Hello. multiboot helpers have no real reason to stay in kernel. So here 
> is the proposition to move them out of it to _multiboot.mod.
> Changelog:
> 2009-02-11  Vladimir Serbinenko  <phcoder@gmail.com>
> 
>     Move multiboot helper out of kernel
> 
>     * conf/i386-pc.rmk: Add loader/i386/multiboot.S to
>     _multiboot.mod
>     * conf/i386-coreboot.rmk: Likewise
>     * conf/i386-ieee1275.rmk: Likewise
>     * kern/i386/loader.S: Move multiboot helpers from here...
>     * loader/i386/multiboot.S: ...moved here
>     * include/grub/i386/loader.h: Move declarations of multiboot
>     helpers from here...
>     * include/grub/i386/multiboot.h: ...moved here
>     * loader/i386/pc/multiboot.c: Added include of
>     grub/cpu/multiboot.h
> 
> Thanks
> Vladimir 'phcoder' Serbinenko
> 


-- 

Regards
Vladimir 'phcoder' Serbinenko

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Index: conf/i386-pc.rmk
===================================================================
--- conf/i386-pc.rmk	(revision 2030)
+++ conf/i386-pc.rmk	(working copy)
@@ -238,11 +238,13 @@
 
 # For _multiboot.mod.
 _multiboot_mod_SOURCES = loader/i386/multiboot.c \
+			 loader/i386/multiboot_helper.S \
                          loader/i386/pc/multiboot2.c \
                          loader/multiboot2.c \
                          loader/multiboot_loader.c
 _multiboot_mod_CFLAGS = $(COMMON_CFLAGS)
 _multiboot_mod_LDFLAGS = $(COMMON_LDFLAGS)
+_multiboot_mod_ASFLAGS = $(COMMON_ASFLAGS)
 
 # For multiboot.mod.
 multiboot_mod_SOURCES = loader/multiboot_loader_normal.c 
Index: conf/i386-coreboot.rmk
===================================================================
--- conf/i386-coreboot.rmk	(revision 2030)
+++ conf/i386-coreboot.rmk	(working copy)
@@ -151,10 +151,12 @@
 # For _multiboot.mod.
 _multiboot_mod_SOURCES = loader/i386/multiboot.c \
                          loader/i386/pc/multiboot2.c \
+			 loader/i386/multiboot_helper.S \
                          loader/multiboot2.c \
                          loader/multiboot_loader.c
 _multiboot_mod_CFLAGS = $(COMMON_CFLAGS)
 _multiboot_mod_LDFLAGS = $(COMMON_LDFLAGS)
+_multiboot_mod_ASFLAGS = $(COMMON_ASFLAGS)
 
 # For multiboot.mod.
 multiboot_mod_SOURCES = loader/multiboot_loader_normal.c 
Index: conf/i386-ieee1275.rmk
===================================================================
--- conf/i386-ieee1275.rmk	(revision 2030)
+++ conf/i386-ieee1275.rmk	(working copy)
@@ -126,10 +126,12 @@
 
 # For _multiboot.mod.
 _multiboot_mod_SOURCES = loader/ieee1275/multiboot2.c \
+			 loader/i386/multiboot_helper.S \
 			 loader/multiboot2.c \
 			 loader/multiboot_loader.c
 _multiboot_mod_CFLAGS = $(COMMON_CFLAGS)
 _multiboot_mod_LDFLAGS = $(COMMON_LDFLAGS)
+_multiboot_mod_ASFLAGS = $(COMMON_ASFLAGS)
 
 # For multiboot.mod.
 multiboot_mod_SOURCES = loader/multiboot_loader_normal.c 
Index: kern/i386/loader.S
===================================================================
--- kern/i386/loader.S	(revision 2030)
+++ kern/i386/loader.S	(working copy)
@@ -118,107 +118,7 @@
 	.word	0
 	.code32
 
-
 /*
- * This starts the multiboot kernel.
- */
-
-VARIABLE(grub_multiboot_payload_size)
-	.long	0
-VARIABLE(grub_multiboot_payload_orig)
-	.long	0
-VARIABLE(grub_multiboot_payload_dest)
-	.long	0
-VARIABLE(grub_multiboot_payload_entry_offset)
-	.long	0
-
-/*
- * The relocators below understand the following parameters:
- * ecx:	Size of the block to be copied.
- * esi:	Where to copy from (always lowest address, even if we're relocating
- *      backwards).
- * edi:	Where to copy to (likewise).
- * edx:	Offset of the entry point (relative to the beginning of the block).
- */
-VARIABLE(grub_multiboot_forward_relocator)
-	/* Add entry offset.  */
-	addl	%edi, %edx
-
-	/* Forward copy.  */
-	cld
-	rep
-	movsb
-
-	jmp	*%edx
-VARIABLE(grub_multiboot_forward_relocator_end)
-
-VARIABLE(grub_multiboot_backward_relocator)
-	/* Add entry offset (before %edi is mangled).  */
-	addl	%edi, %edx
-
-	/* Backward movsb is implicitly off-by-one.  compensate that.  */
-	decl	%esi
-	decl	%edi
-
-	/* Backward copy.  */
-	std
-	addl	%ecx, %esi
-	addl	%ecx, %edi
-	rep
-	movsb
-
-	jmp	*%edx
-VARIABLE(grub_multiboot_backward_relocator_end)
-
-FUNCTION(grub_multiboot_real_boot)
-	/* Push the entry address on the stack.  */
-	pushl	%eax
-	/* Move the address of the multiboot information structure to ebx.  */
-	movl	%edx,%ebx
-
-	/* Unload all modules and stop the floppy driver.  */
-	call	EXT_C(grub_dl_unload_all)
-	call	EXT_C(grub_stop_floppy)
-
-	/* Interrupts should be disabled.  */
-	cli
-
-	/* Where do we copy what from.  */
-	movl	EXT_C(grub_multiboot_payload_size), %ecx
-	movl	EXT_C(grub_multiboot_payload_orig), %esi
-	movl	EXT_C(grub_multiboot_payload_dest), %edi
-	movl	EXT_C(grub_multiboot_payload_entry_offset), %edx
-
-	/* Move the magic value into eax.  */
-	movl	$MULTIBOOT_MAGIC2, %eax
-				
-	/* Jump to the relocator.  */
-	popl	%ebp
-	jmp 	*%ebp
-	
-/*
- * This starts the multiboot 2 kernel.
- */
-
-FUNCTION(grub_multiboot2_real_boot)
-        /* Push the entry address on the stack.  */
-        pushl   %eax
-        /* Move the address of the multiboot information structure to ebx.  */
-        movl    %edx,%ebx
-
-        /* Unload all modules and stop the floppy driver.  */
-        call    EXT_C(grub_dl_unload_all)
-        call    EXT_C(grub_stop_floppy)
-
-        /* Interrupts should be disabled.  */
-        cli
-
-        /* Move the magic value into eax and jump to the kernel.  */
-        movl    $MULTIBOOT2_BOOTLOADER_MAGIC,%eax
-        popl    %ecx
-        jmp     *%ecx
-
-/*
  * Use cdecl calling convention for *BSD kernels.
  */
 
Index: include/grub/i386/loader.h
===================================================================
--- include/grub/i386/loader.h	(revision 2030)
+++ include/grub/i386/loader.h	(working copy)
@@ -22,7 +22,6 @@
 #include <grub/types.h>
 #include <grub/err.h>
 #include <grub/symbol.h>
-#include <grub/multiboot.h>
 
 extern grub_uint32_t EXPORT_VAR(grub_linux_prot_size);
 extern char *EXPORT_VAR(grub_linux_tmp_addr);
@@ -33,31 +32,15 @@
 
 grub_err_t EXPORT_FUNC(grub_linux_boot) (void);
 
-/* The asm part of the multiboot loader.  */
-void EXPORT_FUNC(grub_multiboot_real_boot) (grub_addr_t entry,
-					    struct grub_multiboot_info *mbi)
-     __attribute__ ((noreturn));
-void EXPORT_FUNC(grub_multiboot2_real_boot) (grub_addr_t entry,
-                                             struct grub_multiboot_info *mbi)
-     __attribute__ ((noreturn));
 void EXPORT_FUNC(grub_unix_real_boot) (grub_addr_t entry, ...)
      __attribute__ ((cdecl,noreturn));
 
-extern grub_addr_t EXPORT_VAR(grub_multiboot_payload_orig);
-extern grub_addr_t EXPORT_VAR(grub_multiboot_payload_dest);
-extern grub_size_t EXPORT_VAR(grub_multiboot_payload_size);
-extern grub_uint32_t EXPORT_VAR(grub_multiboot_payload_entry_offset);
-
 /* It is necessary to export these functions, because normal mode commands
    reuse rescue mode commands.  */
 void grub_rescue_cmd_linux (int argc, char *argv[]);
 void grub_rescue_cmd_initrd (int argc, char *argv[]);
 
-extern grub_uint8_t EXPORT_VAR(grub_multiboot_forward_relocator);
-extern grub_uint8_t EXPORT_VAR(grub_multiboot_forward_relocator_end);
-extern grub_uint8_t EXPORT_VAR(grub_multiboot_backward_relocator);
-extern grub_uint8_t EXPORT_VAR(grub_multiboot_backward_relocator_end);
+void EXPORT_FUNC(grub_stop_floppy) (void);
 
-#define RELOCATOR_SIZEOF(x)	(&grub_multiboot_##x##_relocator_end - &grub_multiboot_##x##_relocator)
 
 #endif /* ! GRUB_LOADER_CPU_HEADER */
Index: include/grub/i386/multiboot.h
===================================================================
--- include/grub/i386/multiboot.h	(revision 0)
+++ include/grub/i386/multiboot.h	(revision 0)
@@ -0,0 +1,42 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_MULTIBOOT_CPU_HEADER
+#define GRUB_MULTIBOOT_CPU_HEADER	1
+
+/* The asm part of the multiboot loader.  */
+void grub_multiboot_real_boot (grub_addr_t entry,
+			       struct grub_multiboot_info *mbi)
+     __attribute__ ((noreturn));
+void grub_multiboot2_real_boot (grub_addr_t entry,
+				struct grub_multiboot_info *mbi)
+     __attribute__ ((noreturn));
+
+extern grub_addr_t grub_multiboot_payload_orig;
+extern grub_addr_t grub_multiboot_payload_dest;
+extern grub_size_t grub_multiboot_payload_size;
+extern grub_uint32_t grub_multiboot_payload_entry_offset;
+
+extern grub_uint8_t grub_multiboot_forward_relocator;
+extern grub_uint8_t grub_multiboot_forward_relocator_end;
+extern grub_uint8_t grub_multiboot_backward_relocator;
+extern grub_uint8_t grub_multiboot_backward_relocator_end;
+
+#define RELOCATOR_SIZEOF(x)	(&grub_multiboot_##x##_relocator_end - &grub_multiboot_##x##_relocator)
+
+#endif /* ! GRUB_MULTIBOOT_CPU_HEADER */
Index: loader/i386/multiboot.c
===================================================================
--- loader/i386/multiboot.c	(revision 2030)
+++ loader/i386/multiboot.c	(working copy)
@@ -32,6 +32,7 @@
 #include <grub/multiboot.h>
 #include <grub/machine/init.h>
 #include <grub/machine/memory.h>
+#include <grub/cpu/multiboot.h>
 #include <grub/elf.h>
 #include <grub/aout.h>
 #include <grub/file.h>
@@ -53,6 +54,8 @@
 static grub_err_t
 grub_multiboot_boot (void)
 {
+  grub_stop_floppy ();
+
   grub_multiboot_real_boot (entry, mbi_dest);
 
   /* Not reached.  */
Index: loader/i386/pc/multiboot2.c
===================================================================
--- loader/i386/pc/multiboot2.c	(revision 2030)
+++ loader/i386/pc/multiboot2.c	(working copy)
@@ -73,6 +73,7 @@
 void
 grub_mb2_arch_boot (grub_addr_t entry, void *tags)
 {
+  grub_stop_floppy ();
   grub_multiboot2_real_boot (entry, tags);
 }
 
Index: loader/i386/multiboot_helper.S
===================================================================
--- loader/i386/multiboot_helper.S	(revision 0)
+++ loader/i386/multiboot_helper.S	(revision 0)
@@ -0,0 +1,115 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+#include <multiboot.h>
+#include <multiboot2.h>
+	
+	.p2align	2	/* force 4-byte alignment */
+
+/*
+ * This starts the multiboot kernel.
+ */
+
+VARIABLE(grub_multiboot_payload_size)
+	.long	0
+VARIABLE(grub_multiboot_payload_orig)
+	.long	0
+VARIABLE(grub_multiboot_payload_dest)
+	.long	0
+VARIABLE(grub_multiboot_payload_entry_offset)
+	.long	0
+
+/*
+ * The relocators below understand the following parameters:
+ * ecx:	Size of the block to be copied.
+ * esi:	Where to copy from (always lowest address, even if we're relocating
+ *      backwards).
+ * edi:	Where to copy to (likewise).
+ * edx:	Offset of the entry point (relative to the beginning of the block).
+ */
+
+VARIABLE(grub_multiboot_forward_relocator)
+	/* Add entry offset.  */
+	addl	%edi, %edx
+
+	/* Forward copy.  */
+	cld
+	rep
+	movsb
+
+	jmp	*%edx
+VARIABLE(grub_multiboot_forward_relocator_end)
+
+VARIABLE(grub_multiboot_backward_relocator)
+	/* Add entry offset (before %edi is mangled).  */
+	addl	%edi, %edx
+
+	/* Backward movsb is implicitly off-by-one.  compensate that.  */
+	decl	%esi
+	decl	%edi
+
+	/* Backward copy.  */
+	std
+	addl	%ecx, %esi
+	addl	%ecx, %edi
+	rep
+	movsb
+
+	jmp	*%edx
+VARIABLE(grub_multiboot_backward_relocator_end)
+
+FUNCTION(grub_multiboot_real_boot)
+	/* Push the entry address on the stack.  */
+	pushl	%eax
+	/* Move the address of the multiboot information structure to ebx.  */
+	movl	%edx,%ebx
+
+	/* Interrupts should be disabled.  */
+	cli
+
+	/* Where do we copy what from.  */
+	movl	EXT_C(grub_multiboot_payload_size), %ecx
+	movl	EXT_C(grub_multiboot_payload_orig), %esi
+	movl	EXT_C(grub_multiboot_payload_dest), %edi
+	movl	EXT_C(grub_multiboot_payload_entry_offset), %edx
+
+	/* Move the magic value into eax.  */
+	movl	$MULTIBOOT_MAGIC2, %eax
+				
+	/* Jump to the relocator.  */
+	popl	%ebp
+	jmp 	*%ebp
+
+/*
+ * This starts the multiboot 2 kernel.
+ */
+
+FUNCTION(grub_multiboot2_real_boot)
+        /* Push the entry address on the stack.  */
+        pushl   %eax
+        /* Move the address of the multiboot information structure to ebx.  */
+        movl    %edx,%ebx
+
+        /* Interrupts should be disabled.  */
+        cli
+
+        /* Move the magic value into eax and jump to the kernel.  */
+        movl    $MULTIBOOT2_BOOTLOADER_MAGIC,%eax
+        popl    %ecx
+        jmp     *%ecx