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[Xen-changelog] [xen-unstable] [MINIOS] New make structure to support di

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Subject: [Xen-changelog] [xen-unstable] [MINIOS] New make structure to support different architectures.
From: Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 17 Jan 2007 10:40:16 -0800
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# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1169046590 0
# Node ID 8690e3448971b254558f1b233801b47e045ba9c2
# Parent  120d882a4d8efe5a82365ff54b91d6cfbf636dde
[MINIOS] New make structure to support different architectures.
Signed-off-by: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>
---
 extras/mini-os/minios-x86_32.lds          |   45 ---
 extras/mini-os/minios-x86_64.lds          |   54 ----
 extras/mini-os/x86_32.S                   |  287 ----------------------
 extras/mini-os/x86_64.S                   |  385 ------------------------------
 extras/mini-os/Makefile                   |  168 +++++--------
 extras/mini-os/arch/x86/Makefile          |   29 ++
 extras/mini-os/arch/x86/arch.mk           |   28 ++
 extras/mini-os/arch/x86/minios-x86_32.lds |   45 +++
 extras/mini-os/arch/x86/minios-x86_64.lds |   54 ++++
 extras/mini-os/arch/x86/x86_32.S          |  287 ++++++++++++++++++++++
 extras/mini-os/arch/x86/x86_64.S          |  385 ++++++++++++++++++++++++++++++
 extras/mini-os/minios.mk                  |   62 ++++
 12 files changed, 965 insertions(+), 864 deletions(-)

diff -r 120d882a4d8e -r 8690e3448971 extras/mini-os/Makefile
--- a/extras/mini-os/Makefile   Wed Jan 17 15:03:27 2007 +0000
+++ b/extras/mini-os/Makefile   Wed Jan 17 15:09:50 2007 +0000
@@ -1,112 +1,88 @@ debug ?= y
-debug ?= y
+# Common Makefile for mini-os.
+#
+# Every architecture directory below mini-os/arch has to have a
+# Makefile and a arch.mk.
+#
+
 pae ?= n
 
 XEN_ROOT = ../..
 include $(XEN_ROOT)/Config.mk
 
+XEN_INTERFACE_VERSION := 0x00030204
+export XEN_INTERFACE_VERSION
+
 # Set TARGET_ARCH
-override TARGET_ARCH     := $(XEN_TARGET_ARCH)
+override TARGET_ARCH := $(XEN_TARGET_ARCH)
 
-XEN_INTERFACE_VERSION := 0x00030204
+# Set mini-os root path, used in mini-os.mk.
+MINI-OS_ROOT=$(PWD)
+export MINI-OS_ROOT
 
-# NB. '-Wcast-qual' is nasty, so I omitted it.
-CFLAGS := -fno-builtin -Wall -Werror -Wredundant-decls -Wno-format
-CFLAGS += -Wstrict-prototypes -Wnested-externs -Wpointer-arith -Winline
-CFLAGS += -D__XEN_INTERFACE_VERSION__=$(XEN_INTERFACE_VERSION)
+# Try to find out the architecture family TARGET_ARCH_FAM.
+# First check whether x86_... is contained (for x86_32, x86_32y, x86_64).
+# If not x86 then use $(TARGET_ARCH) -> for ia64, ...
+ifeq ($(findstring x86_,$(TARGET_ARCH)),x86_)
+TARGET_ARCH_FAM = x86
+else
+TARGET_ARCH_FAM = $(TARGET_ARCH)
+endif
 
-ASFLAGS = -D__ASSEMBLY__
+# The architecture family directory below mini-os.
+TARGET_ARCH_DIR := arch/$(TARGET_ARCH_FAM)
 
-LDLIBS =  -L. -lminios
-LDFLAGS_FINAL := -N -T minios-$(TARGET_ARCH).lds
-LDFLAGS :=
+# Export these variables for possible use in architecture dependent makefiles.
+export TARGET_ARCH
+export TARGET_ARCH_DIR
+export TARGET_ARCH_FAM
+
+# This is used for architecture specific links.
+# This can be overwritten from arch specific rules.
+ARCH_LINKS =
+
+# For possible special header directories.
+# This can be overwritten from arch specific rules.
+EXTRA_INC =
+
+# Special build dependencies.
+# Build all after touching this/these file(s) (see minios.mk)
+SPEC_DEPENDS = minios.mk
+
+# Include the architecture family's special makerules.
+# This must be before include minios.mk!
+include $(TARGET_ARCH_DIR)/arch.mk
+
+# Include common mini-os makerules.
+include minios.mk
+
+# Define some default flags for linking.
+LDLIBS := 
+LDFLAGS := 
+LDARCHLIB := -L$(TARGET_ARCH_DIR) -l$(ARCH_LIB_NAME)
+LDFLAGS_FINAL := -N -T $(TARGET_ARCH_DIR)/minios-$(TARGET_ARCH).lds
 
 # Prefix for global API names. All other symbols are localised before
 # linking with EXTRA_OBJS.
 GLOBAL_PREFIX := xenos_
 EXTRA_OBJS =
 
-# For possible special source directories.
-EXTRA_SRC =
-# For possible special header directories.
-EXTRA_INC =
-
-# Standard name for architecture specific subdirectories.
-TARGET_ARCH_DIR = $(TARGET_ARCH)
-# This is used for architecture specific links.
-ARCH_LINKS =
-
-ifeq ($(TARGET_ARCH),x86_32)
-CFLAGS += -m32 -march=i686
-LDFLAGS += -m elf_i386
-TARGET_ARCH_DIR = x86
-EXTRA_INC += $(TARGET_ARCH_DIR)/$(TARGET_ARCH)
-EXTRA_SRC += arch/$(EXTRA_INC)
-endif
-
-ifeq ($(TARGET_ARCH)$(pae),x86_32y)
-CFLAGS  += -DCONFIG_X86_PAE=1
-ASFLAGS += -DCONFIG_X86_PAE=1
-TARGET_ARCH_DIR = x86
-EXTRA_INC += $(TARGET_ARCH_DIR)/$(TARGET_ARCH)
-EXTRA_SRC += arch/$(EXTRA_INC)
-endif
-
-ifeq ($(TARGET_ARCH),x86_64)
-CFLAGS += -m64 -mno-red-zone -fpic -fno-reorder-blocks
-CFLAGS += -fno-asynchronous-unwind-tables
-LDFLAGS += -m elf_x86_64
-TARGET_ARCH_DIR = x86
-EXTRA_INC += $(TARGET_ARCH_DIR)/$(TARGET_ARCH)
-EXTRA_SRC += arch/$(EXTRA_INC)
-endif
-
-ifeq ($(TARGET_ARCH),ia64)
-CFLAGS += -mfixed-range=f2-f5,f12-f15,f32-f127 -mconstant-gp
-ASFLAGS += -x assembler-with-cpp -Wall
-ASFLAGS += -mfixed-range=f2-f5,f12-f15,f32-f127 -fomit-frame-pointer
-ASFLAGS += -fno-builtin -fno-common -fno-strict-aliasing -mconstant-gp
-ARCH_LINKS = IA64_LINKS                # Special link on ia64 needed
-define arch_links
-[ -e include/ia64/asm-xsi-offsets.h ] || ln -sf 
../../../../xen/include/asm-ia64/asm-xsi-offsets.h 
include/ia64/asm-xsi-offsets.h
-endef
-endif
-
-ifeq ($(debug),y)
-CFLAGS += -g
-else
-CFLAGS += -O3
-endif
-
-# Add the special header directories to the include paths.
-extra_incl := $(foreach dir,$(EXTRA_INC),-Iinclude/$(dir))
-override CPPFLAGS := -Iinclude $(CPPFLAGS) -Iinclude/$(TARGET_ARCH_DIR)        
$(extra_incl)
-
 TARGET := mini-os
 
-HEAD := $(TARGET_ARCH).o
+# Subdirectories common to mini-os
+SUBDIRS := lib xenbus console
+
+# The common mini-os objects to build.
 OBJS := $(patsubst %.c,%.o,$(wildcard *.c))
 OBJS += $(patsubst %.c,%.o,$(wildcard lib/*.c))
 OBJS += $(patsubst %.c,%.o,$(wildcard xenbus/*.c))
 OBJS += $(patsubst %.c,%.o,$(wildcard console/*.c))
-OBJS += $(patsubst %.S,%.o,$(wildcard arch/$(TARGET_ARCH_DIR)/*.S))
-OBJS += $(patsubst %.c,%.o,$(wildcard arch/$(TARGET_ARCH_DIR)/*.c))
-# For special wanted source directories.
-extra_objs := $(foreach dir,$(EXTRA_SRC),$(patsubst %.c,%.o,$(wildcard 
$(dir)/*.c)))
-OBJS += $(extra_objs)
-extra_objs := $(foreach dir,$(EXTRA_SRC),$(patsubst %.S,%.o,$(wildcard 
$(dir)/*.S)))
-OBJS += $(extra_objs)
 
-HDRS := $(wildcard include/*.h)
-HDRS += $(wildcard include/xen/*.h)
-HDRS += $(wildcard include/$(TARGET_ARCH_DIR)/*.h)
-# For special wanted header directories.
-extra_heads := $(foreach dir,$(EXTRA_INC),$(wildcard $(dir)/*.h))
-HDRS += $(extra_heads)
 
 .PHONY: default
 default: $(TARGET)
 
-# Create special architecture specific links.
+# Create special architecture specific links. The function arch_links
+# has to be defined in arch.mk (see include above).
 ifneq ($(ARCH_LINKS),)
 $(ARCH_LINKS):
        $(arch_links)
@@ -116,24 +92,29 @@ links:     $(ARCH_LINKS)
 links: $(ARCH_LINKS)
        [ -e include/xen ] || ln -sf ../../../xen/include/public include/xen
 
-$(TARGET): links $(OBJS) $(HEAD)
-       $(LD) -r $(LDFLAGS) $(HEAD) $(OBJS) -o $@.o
+.PHONY: arch_lib
+arch_lib:
+       $(MAKE) --directory=$(TARGET_ARCH_DIR) || exit 1;
+
+$(TARGET): links $(OBJS) arch_lib
+       $(LD) -r $(LDFLAGS) $(HEAD_OBJ) $(OBJS) $(LDARCHLIB) -o $@.o
        $(OBJCOPY) -w -G $(GLOBAL_PREFIX)* -G _start $@.o $@.o
        $(LD) $(LDFLAGS) $(LDFLAGS_FINAL) $@.o $(EXTRA_OBJS) -o $@
        gzip -f -9 -c $@ >$@.gz
 
-.PHONY: clean
-clean:
-       find . -type f -name '*.o' | xargs rm -f
-       rm -f *.o *~ core $(TARGET) $(TARGET).gz
+.PHONY: clean arch_clean
+
+arch_clean:
+       $(MAKE) --directory=$(TARGET_ARCH_DIR) clean || exit 1;
+
+clean: arch_clean
+       for dir in $(SUBDIRS); do \
+               rm -f $$dir/*.o; \
+       done
+       rm -f *.o *~ core $(TARGET).elf $(TARGET).raw $(TARGET) $(TARGET).gz
        find . -type l | xargs rm -f
        rm -f tags TAGS
 
-%.o: %.c $(HDRS) Makefile
-       $(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
-
-%.o: %.S $(HDRS) Makefile
-       $(CC) $(ASFLAGS) $(CPPFLAGS) -c $< -o $@
 
 define all_sources
      ( find . -follow -name SCCS -prune -o -name '*.[chS]' -print )
@@ -147,3 +128,4 @@ cscope:
 .PHONY: tags
 tags:
        $(all_sources) | xargs ctags
+
diff -r 120d882a4d8e -r 8690e3448971 extras/mini-os/arch/x86/Makefile
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/extras/mini-os/arch/x86/Makefile  Wed Jan 17 15:09:50 2007 +0000
@@ -0,0 +1,29 @@
+#
+# x86 architecture specific makefiles.
+# It's is used for x86_32, x86_32y and x86_64
+#
+
+# Rebuild all after touching this/these extra file(s) (see mini-os.mk)
+SPEC_DEP = arch.mk
+
+# include arch.mk has to be before mini-os.mk!
+include arch.mk
+include ../../minios.mk
+
+# Sources here are all *.c *.S without $(TARGET_ARCH).S
+# This is handled in $(HEAD_ARCH_OBJ)
+ARCH_SRCS := $(wildcard *.c)
+
+# The objects built from the sources.
+ARCH_OBJS := $(patsubst %.c,%.o,$(ARCH_SRCS))
+
+all: $(ARCH_LIB)
+
+# $(HEAD_ARCH_OBJ) is only build here, needed on linking
+# in ../../Makefile.
+$(ARCH_LIB): $(ARCH_OBJS) $(HEAD_ARCH_OBJ)
+       $(AR) rv $(ARCH_LIB) $(ARCH_OBJS)
+
+clean:
+       rm -f $(ARCH_LIB) $(ARCH_OBJS)
+
diff -r 120d882a4d8e -r 8690e3448971 extras/mini-os/arch/x86/arch.mk
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/extras/mini-os/arch/x86/arch.mk   Wed Jan 17 15:09:50 2007 +0000
@@ -0,0 +1,28 @@
+#
+# Architecture special makerules for x86 family
+# (including x86_32, x86_32y and x86_64).
+#
+
+ifeq ($(TARGET_ARCH),x86_32)
+ARCH_CFLAGS  := -m32 -march=i686
+ARCH_LDFLAGS := -m elf_i386
+EXTRA_INC += $(TARGET_ARCH_FAM)/$(TARGET_ARCH)
+EXTRA_SRC += arch/$(EXTRA_INC)
+endif
+
+ifeq ($(TARGET_ARCH)$(pae),x86_32y)
+ARCH_CFLAGS  := -DCONFIG_X86_PAE=1
+ARCH_ASFLAGS := -DCONFIG_X86_PAE=1
+EXTRA_INC += $(TARGET_ARCH_FAM)/$(TARGET_ARCH)
+EXTRA_SRC += arch/$(EXTRA_INC)
+endif
+
+ifeq ($(TARGET_ARCH),x86_64)
+ARCH_CFLAGS := -m64 -mno-red-zone -fpic -fno-reorder-blocks
+ARCH_CFLAGS := -fno-asynchronous-unwind-tables
+ARCH_LDFLAGS := -m elf_x86_64
+EXTRA_INC += $(TARGET_ARCH_FAM)/$(TARGET_ARCH)
+EXTRA_SRC += arch/$(EXTRA_INC)
+endif
+
+
diff -r 120d882a4d8e -r 8690e3448971 extras/mini-os/arch/x86/minios-x86_32.lds
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/extras/mini-os/arch/x86/minios-x86_32.lds Wed Jan 17 15:09:50 2007 +0000
@@ -0,0 +1,45 @@
+OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
+OUTPUT_ARCH(i386)
+ENTRY(_start)
+SECTIONS
+{
+  . = 0x0;
+  _text = .;                   /* Text and read-only data */
+  .text : {
+       *(.text)
+       *(.gnu.warning)
+       } = 0x9090
+
+  _etext = .;                  /* End of text section */
+
+  .rodata : { *(.rodata) *(.rodata.*) }
+
+  .data : {                    /* Data */
+       *(.data)
+       CONSTRUCTORS
+       }
+
+  _edata = .;                  /* End of data section */
+
+  __bss_start = .;             /* BSS */
+  .bss : {
+       *(.bss)
+       }
+  _end = . ;
+
+  /* Sections to be discarded */
+  /DISCARD/ : {
+       *(.text.exit)
+       *(.data.exit)
+       *(.exitcall.exit)
+       }
+
+  /* Stabs debugging sections.  */
+  .stab 0 : { *(.stab) }
+  .stabstr 0 : { *(.stabstr) }
+  .stab.excl 0 : { *(.stab.excl) }
+  .stab.exclstr 0 : { *(.stab.exclstr) }
+  .stab.index 0 : { *(.stab.index) }
+  .stab.indexstr 0 : { *(.stab.indexstr) }
+  .comment 0 : { *(.comment) }
+}
diff -r 120d882a4d8e -r 8690e3448971 extras/mini-os/arch/x86/minios-x86_64.lds
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/extras/mini-os/arch/x86/minios-x86_64.lds Wed Jan 17 15:09:50 2007 +0000
@@ -0,0 +1,54 @@
+OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
+OUTPUT_ARCH(i386:x86-64)
+ENTRY(_start)
+SECTIONS
+{
+  . = 0x0;
+  _text = .;                   /* Text and read-only data */
+  .text : {
+       *(.text)
+       *(.gnu.warning)
+       } = 0x9090
+
+  _etext = .;                  /* End of text section */
+
+  .rodata : { *(.rodata) *(.rodata.*) }
+
+  .data : {                    /* Data */
+       *(.data)
+       CONSTRUCTORS
+       }
+
+  _edata = .;                  /* End of data section */
+
+  . = ALIGN(8192);             /* init_task */
+  .data.init_task : { *(.data.init_task) }
+
+  . = ALIGN(4096);
+  .data.page_aligned : { *(.data.idt) }
+
+  . = ALIGN(32);
+  .data.cacheline_aligned : { *(.data.cacheline_aligned) }
+
+  __bss_start = .;             /* BSS */
+  .bss : {
+       *(.bss)
+       }
+  _end = . ;
+
+  /* Sections to be discarded */
+  /DISCARD/ : {
+       *(.text.exit)
+       *(.data.exit)
+       *(.exitcall.exit)
+       }
+
+  /* Stabs debugging sections.  */
+  .stab 0 : { *(.stab) }
+  .stabstr 0 : { *(.stabstr) }
+  .stab.excl 0 : { *(.stab.excl) }
+  .stab.exclstr 0 : { *(.stab.exclstr) }
+  .stab.index 0 : { *(.stab.index) }
+  .stab.indexstr 0 : { *(.stab.indexstr) }
+  .comment 0 : { *(.comment) }
+}
diff -r 120d882a4d8e -r 8690e3448971 extras/mini-os/arch/x86/x86_32.S
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/extras/mini-os/arch/x86/x86_32.S  Wed Jan 17 15:09:50 2007 +0000
@@ -0,0 +1,287 @@
+#include <os.h>
+#include <xen/arch-x86_32.h>
+
+.section __xen_guest
+       .ascii  "GUEST_OS=Mini-OS"
+       .ascii  ",XEN_VER=xen-3.0"
+       .ascii  ",VIRT_BASE=0x0" /* &_text from minios_x86_32.lds */
+       .ascii  ",ELF_PADDR_OFFSET=0x0"
+       .ascii  ",HYPERCALL_PAGE=0x2"
+#ifdef CONFIG_X86_PAE
+       .ascii  ",PAE=yes"
+#else
+       .ascii  ",PAE=no"
+#endif
+       .ascii  ",LOADER=generic"
+       .byte   0
+.text
+
+.globl _start, shared_info, hypercall_page
+                        
+_start:
+        cld
+        lss stack_start,%esp
+        push %esi 
+        call start_kernel
+
+stack_start:
+       .long stack+8192, __KERNEL_SS
+
+        /* Unpleasant -- the PTE that maps this page is actually overwritten */
+        /* to map the real shared-info page! :-)                             */
+        .org 0x1000
+shared_info:
+        .org 0x2000
+
+hypercall_page:
+        .org 0x3000
+
+ES             = 0x20
+ORIG_EAX       = 0x24
+EIP            = 0x28
+CS             = 0x2C
+
+#define ENTRY(X) .globl X ; X :
+
+#define SAVE_ALL \
+       cld; \
+       pushl %es; \
+       pushl %ds; \
+       pushl %eax; \
+       pushl %ebp; \
+       pushl %edi; \
+       pushl %esi; \
+       pushl %edx; \
+       pushl %ecx; \
+       pushl %ebx; \
+       movl $(__KERNEL_DS),%edx; \
+       movl %edx,%ds; \
+       movl %edx,%es;
+
+#define RESTORE_ALL    \
+       popl %ebx;      \
+       popl %ecx;      \
+       popl %edx;      \
+       popl %esi;      \
+       popl %edi;      \
+       popl %ebp;      \
+       popl %eax;      \
+       popl %ds;       \
+       popl %es;       \
+       addl $4,%esp;   \
+       iret;           \
+
+ENTRY(divide_error)
+       pushl $0                # no error code
+       pushl $do_divide_error
+do_exception:
+    pushl %ds
+       pushl %eax
+       xorl %eax, %eax
+       pushl %ebp
+       pushl %edi
+       pushl %esi
+       pushl %edx
+       decl %eax                       # eax = -1
+       pushl %ecx
+       pushl %ebx
+       cld
+       movl %es, %ecx
+       movl ES(%esp), %edi             # get the function address
+       movl ORIG_EAX(%esp), %edx       # get the error code
+       movl %eax, ORIG_EAX(%esp)
+       movl %ecx, ES(%esp)
+       movl $(__KERNEL_DS), %ecx
+       movl %ecx, %ds
+       movl %ecx, %es
+       movl %esp,%eax                  # pt_regs pointer
+    pushl %edx
+    pushl %eax
+       call *%edi
+    jmp ret_from_exception
+    
+ret_from_exception:
+        movb CS(%esp),%cl
+       test $2,%cl          # slow return to ring 2 or 3
+       jne  safesti
+        RESTORE_ALL
+
+# A note on the "critical region" in our callback handler.
+# We want to avoid stacking callback handlers due to events occurring
+# during handling of the last event. To do this, we keep events disabled
+# until weve done all processing. HOWEVER, we must enable events before
+# popping the stack frame (cant be done atomically) and so it would still
+# be possible to get enough handler activations to overflow the stack.
+# Although unlikely, bugs of that kind are hard to track down, so wed
+# like to avoid the possibility.
+# So, on entry to the handler we detect whether we interrupted an
+# existing activation in its critical region -- if so, we pop the current
+# activation and restart the handler using the previous one.
+ENTRY(hypervisor_callback)
+        pushl %eax
+        SAVE_ALL
+        movl EIP(%esp),%eax
+        cmpl $scrit,%eax
+        jb   11f
+        cmpl $ecrit,%eax
+        jb   critical_region_fixup
+11:     push %esp
+        call do_hypervisor_callback
+        add  $4,%esp
+        movl HYPERVISOR_shared_info,%esi
+        xorl %eax,%eax
+        movb CS(%esp),%cl
+       test $2,%cl          # slow return to ring 2 or 3
+        jne  safesti
+safesti:movb $0,1(%esi)     # reenable event callbacks
+scrit:  /**** START OF CRITICAL REGION ****/
+        testb $0xFF,(%esi)
+        jnz  14f              # process more events if necessary...
+        RESTORE_ALL
+14:     movb $1,1(%esi)
+        jmp  11b
+ecrit:  /**** END OF CRITICAL REGION ****/
+# [How we do the fixup]. We want to merge the current stack frame with the
+# just-interrupted frame. How we do this depends on where in the critical
+# region the interrupted handler was executing, and so how many saved
+# registers are in each frame. We do this quickly using the lookup table
+# 'critical_fixup_table'. For each byte offset in the critical region, it
+# provides the number of bytes which have already been popped from the
+# interrupted stack frame. 
+critical_region_fixup:
+        addl $critical_fixup_table-scrit,%eax
+        movzbl (%eax),%eax    # %eax contains num bytes popped
+        mov  %esp,%esi
+        add  %eax,%esi        # %esi points at end of src region
+        mov  %esp,%edi
+        add  $0x34,%edi       # %edi points at end of dst region
+        mov  %eax,%ecx
+        shr  $2,%ecx          # convert words to bytes
+        je   16f              # skip loop if nothing to copy
+15:     subl $4,%esi          # pre-decrementing copy loop
+        subl $4,%edi
+        movl (%esi),%eax
+        movl %eax,(%edi)
+        loop 15b
+16:     movl %edi,%esp        # final %edi is top of merged stack
+        jmp  11b
+         
+critical_fixup_table:        
+        .byte 0x00,0x00,0x00                  # testb $0xff,(%esi)
+        .byte 0x00,0x00                       # jne  14f
+        .byte 0x00                            # pop  %ebx
+        .byte 0x04                            # pop  %ecx
+        .byte 0x08                            # pop  %edx
+        .byte 0x0c                            # pop  %esi
+        .byte 0x10                            # pop  %edi
+        .byte 0x14                            # pop  %ebp
+        .byte 0x18                            # pop  %eax
+        .byte 0x1c                            # pop  %ds
+        .byte 0x20                            # pop  %es
+        .byte 0x24,0x24,0x24                  # add  $4,%esp
+        .byte 0x28                            # iret
+        .byte 0x00,0x00,0x00,0x00             # movb $1,1(%esi)
+        .byte 0x00,0x00                       # jmp  11b
+       
+# Hypervisor uses this for application faults while it executes.
+ENTRY(failsafe_callback)
+      pop  %ds
+      pop  %es
+      pop  %fs
+      pop  %gs
+      iret
+                
+ENTRY(coprocessor_error)
+       pushl $0
+       pushl $do_coprocessor_error
+       jmp do_exception
+
+ENTRY(simd_coprocessor_error)
+       pushl $0
+       pushl $do_simd_coprocessor_error
+       jmp do_exception
+
+ENTRY(device_not_available)
+        iret
+
+ENTRY(debug)
+       pushl $0
+       pushl $do_debug
+       jmp do_exception
+
+ENTRY(int3)
+       pushl $0
+       pushl $do_int3
+       jmp do_exception
+
+ENTRY(overflow)
+       pushl $0
+       pushl $do_overflow
+       jmp do_exception
+
+ENTRY(bounds)
+       pushl $0
+       pushl $do_bounds
+       jmp do_exception
+
+ENTRY(invalid_op)
+       pushl $0
+       pushl $do_invalid_op
+       jmp do_exception
+
+
+ENTRY(coprocessor_segment_overrun)
+       pushl $0
+       pushl $do_coprocessor_segment_overrun
+       jmp do_exception
+
+
+ENTRY(invalid_TSS)
+       pushl $do_invalid_TSS
+       jmp do_exception
+
+
+ENTRY(segment_not_present)
+       pushl $do_segment_not_present
+       jmp do_exception
+
+
+ENTRY(stack_segment)
+       pushl $do_stack_segment
+       jmp do_exception
+
+
+ENTRY(general_protection)
+       pushl $do_general_protection
+       jmp do_exception
+
+
+ENTRY(alignment_check)
+       pushl $do_alignment_check
+       jmp do_exception
+
+
+ENTRY(page_fault)
+    pushl $do_page_fault
+    jmp do_exception
+    
+ENTRY(machine_check)
+       pushl $0
+       pushl $do_machine_check
+       jmp do_exception
+
+
+ENTRY(spurious_interrupt_bug)
+       pushl $0
+       pushl $do_spurious_interrupt_bug
+       jmp do_exception
+
+
+
+ENTRY(thread_starter)
+    popl %eax
+    popl %ebx
+    pushl %eax
+    call *%ebx
+    call exit_thread 
+    
diff -r 120d882a4d8e -r 8690e3448971 extras/mini-os/arch/x86/x86_64.S
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/extras/mini-os/arch/x86/x86_64.S  Wed Jan 17 15:09:50 2007 +0000
@@ -0,0 +1,385 @@
+#include <os.h>
+#include <xen/features.h>
+
+.section __xen_guest
+       .ascii  "GUEST_OS=Mini-OS"
+       .ascii  ",XEN_VER=xen-3.0"
+       .ascii  ",VIRT_BASE=0x0" /* &_text from minios_x86_64.lds */
+       .ascii  ",ELF_PADDR_OFFSET=0x0"
+       .ascii  ",HYPERCALL_PAGE=0x2"
+       .ascii  ",LOADER=generic"
+       .byte   0
+.text
+
+#define ENTRY(X) .globl X ; X :
+.globl _start, shared_info, hypercall_page
+
+
+_start:
+        cld
+        movq stack_start(%rip),%rsp
+        movq %rsi,%rdi
+        call start_kernel
+
+stack_start:
+        .quad stack+8192
+
+        /* Unpleasant -- the PTE that maps this page is actually overwritten */
+        /* to map the real shared-info page! :-)                             */
+        .org 0x1000
+shared_info:
+        .org 0x2000
+
+hypercall_page:
+        .org 0x3000
+
+
+/* Offsets into shared_info_t. */                
+#define evtchn_upcall_pending          /* 0 */
+#define evtchn_upcall_mask             1
+
+NMI_MASK = 0x80000000
+
+#define RDI 112
+#define ORIG_RAX 120       /* + error_code */ 
+#define EFLAGS 144
+
+#define REST_SKIP 6*8                  
+.macro SAVE_REST
+       subq $REST_SKIP,%rsp
+#      CFI_ADJUST_CFA_OFFSET   REST_SKIP
+       movq %rbx,5*8(%rsp) 
+#      CFI_REL_OFFSET  rbx,5*8
+       movq %rbp,4*8(%rsp) 
+#      CFI_REL_OFFSET  rbp,4*8
+       movq %r12,3*8(%rsp) 
+#      CFI_REL_OFFSET  r12,3*8
+       movq %r13,2*8(%rsp) 
+#      CFI_REL_OFFSET  r13,2*8
+       movq %r14,1*8(%rsp) 
+#      CFI_REL_OFFSET  r14,1*8
+       movq %r15,(%rsp) 
+#      CFI_REL_OFFSET  r15,0*8
+.endm          
+
+
+.macro RESTORE_REST
+       movq (%rsp),%r15
+#      CFI_RESTORE r15
+       movq 1*8(%rsp),%r14
+#      CFI_RESTORE r14
+       movq 2*8(%rsp),%r13
+#      CFI_RESTORE r13
+       movq 3*8(%rsp),%r12
+#      CFI_RESTORE r12
+       movq 4*8(%rsp),%rbp
+#      CFI_RESTORE rbp
+       movq 5*8(%rsp),%rbx
+#      CFI_RESTORE rbx
+       addq $REST_SKIP,%rsp
+#      CFI_ADJUST_CFA_OFFSET   -(REST_SKIP)
+.endm
+
+
+#define ARG_SKIP 9*8
+.macro RESTORE_ARGS 
skiprax=0,addskip=0,skiprcx=0,skipr11=0,skipr8910=0,skiprdx=0
+       .if \skipr11
+       .else
+       movq (%rsp),%r11
+#      CFI_RESTORE r11
+       .endif
+       .if \skipr8910
+       .else
+       movq 1*8(%rsp),%r10
+#      CFI_RESTORE r10
+       movq 2*8(%rsp),%r9
+#      CFI_RESTORE r9
+       movq 3*8(%rsp),%r8
+#      CFI_RESTORE r8
+       .endif
+       .if \skiprax
+       .else
+       movq 4*8(%rsp),%rax
+#      CFI_RESTORE rax
+       .endif
+       .if \skiprcx
+       .else
+       movq 5*8(%rsp),%rcx
+#      CFI_RESTORE rcx
+       .endif
+       .if \skiprdx
+       .else
+       movq 6*8(%rsp),%rdx
+#      CFI_RESTORE rdx
+       .endif
+       movq 7*8(%rsp),%rsi
+#      CFI_RESTORE rsi
+       movq 8*8(%rsp),%rdi
+#      CFI_RESTORE rdi
+       .if ARG_SKIP+\addskip > 0
+       addq $ARG_SKIP+\addskip,%rsp
+#      CFI_ADJUST_CFA_OFFSET   -(ARG_SKIP+\addskip)
+       .endif
+.endm  
+
+
+.macro HYPERVISOR_IRET flag
+#    testb $3,1*8(%rsp)    /* Don't need to do that in Mini-os, as */
+#      jnz   2f               /* there is no userspace? */
+       testl $NMI_MASK,2*8(%rsp)
+       jnz   2f
+
+       testb $1,(xen_features+XENFEAT_supervisor_mode_kernel)
+       jnz   1f
+
+       /* Direct iret to kernel space. Correct CS and SS. */
+       orb   $3,1*8(%rsp)
+       orb   $3,4*8(%rsp)
+1:     iretq
+
+2:     /* Slow iret via hypervisor. */
+       andl  $~NMI_MASK, 16(%rsp)
+       pushq $\flag
+       jmp  hypercall_page + (__HYPERVISOR_iret * 32)
+.endm
+
+/*
+ * Exception entry point. This expects an error code/orig_rax on the stack
+ * and the exception handler in %rax.  
+ */                                            
+ENTRY(error_entry)
+#      _frame RDI
+       /* rdi slot contains rax, oldrax contains error code */
+       cld     
+       subq  $14*8,%rsp
+#      CFI_ADJUST_CFA_OFFSET   (14*8)
+       movq %rsi,13*8(%rsp)
+#      CFI_REL_OFFSET  rsi,RSI
+       movq 14*8(%rsp),%rsi    /* load rax from rdi slot */
+       movq %rdx,12*8(%rsp)
+#      CFI_REL_OFFSET  rdx,RDX
+       movq %rcx,11*8(%rsp)
+#      CFI_REL_OFFSET  rcx,RCX
+       movq %rsi,10*8(%rsp)    /* store rax */ 
+#      CFI_REL_OFFSET  rax,RAX
+       movq %r8, 9*8(%rsp)
+#      CFI_REL_OFFSET  r8,R8
+       movq %r9, 8*8(%rsp)
+#      CFI_REL_OFFSET  r9,R9
+       movq %r10,7*8(%rsp)
+#      CFI_REL_OFFSET  r10,R10
+       movq %r11,6*8(%rsp)
+#      CFI_REL_OFFSET  r11,R11
+       movq %rbx,5*8(%rsp) 
+#      CFI_REL_OFFSET  rbx,RBX
+       movq %rbp,4*8(%rsp) 
+#      CFI_REL_OFFSET  rbp,RBP
+       movq %r12,3*8(%rsp) 
+#      CFI_REL_OFFSET  r12,R12
+       movq %r13,2*8(%rsp) 
+#      CFI_REL_OFFSET  r13,R13
+       movq %r14,1*8(%rsp) 
+#      CFI_REL_OFFSET  r14,R14
+       movq %r15,(%rsp) 
+#      CFI_REL_OFFSET  r15,R15
+#if 0        
+       cmpl $__KERNEL_CS,CS(%rsp)
+       je  error_kernelspace
+#endif        
+error_call_handler:
+       movq %rdi, RDI(%rsp)            
+       movq %rsp,%rdi
+       movq ORIG_RAX(%rsp),%rsi        # get error code 
+       movq $-1,ORIG_RAX(%rsp)
+       call *%rax
+
+.macro zeroentry sym
+#      INTR_FRAME
+    movq (%rsp),%rcx
+    movq 8(%rsp),%r11
+    addq $0x10,%rsp /* skip rcx and r11 */
+       pushq $0        /* push error code/oldrax */ 
+#      CFI_ADJUST_CFA_OFFSET 8
+       pushq %rax      /* push real oldrax to the rdi slot */ 
+#      CFI_ADJUST_CFA_OFFSET 8
+       leaq  \sym(%rip),%rax
+       jmp error_entry
+#      CFI_ENDPROC
+.endm  
+
+.macro errorentry sym
+#      XCPT_FRAME
+        movq (%rsp),%rcx
+        movq 8(%rsp),%r11
+        addq $0x10,%rsp /* rsp points to the error code */
+       pushq %rax
+#      CFI_ADJUST_CFA_OFFSET 8
+       leaq  \sym(%rip),%rax
+       jmp error_entry
+#      CFI_ENDPROC
+.endm
+
+#define XEN_GET_VCPU_INFO(reg) movq HYPERVISOR_shared_info,reg
+#define XEN_PUT_VCPU_INFO(reg)
+#define XEN_PUT_VCPU_INFO_fixup
+#define XEN_LOCKED_BLOCK_EVENTS(reg)   movb $1,evtchn_upcall_mask(reg)
+#define XEN_LOCKED_UNBLOCK_EVENTS(reg) movb $0,evtchn_upcall_mask(reg)
+#define XEN_TEST_PENDING(reg)  testb $0xFF,evtchn_upcall_pending(reg)
+
+#define XEN_BLOCK_EVENTS(reg)  XEN_GET_VCPU_INFO(reg)                  ; \
+                                       XEN_LOCKED_BLOCK_EVENTS(reg)    ; \
+                                           XEN_PUT_VCPU_INFO(reg)
+
+#define XEN_UNBLOCK_EVENTS(reg)        XEN_GET_VCPU_INFO(reg)                  
; \
+                                               XEN_LOCKED_UNBLOCK_EVENTS(reg)  
; \
+                                       XEN_PUT_VCPU_INFO(reg)
+
+
+
+ENTRY(hypervisor_callback)
+    zeroentry hypervisor_callback2
+
+ENTRY(hypervisor_callback2)
+        movq %rdi, %rsp 
+11:     movq %gs:8,%rax
+        incl %gs:0
+        cmovzq %rax,%rsp
+        pushq %rdi
+        call do_hypervisor_callback 
+        popq %rsp
+        decl %gs:0
+        jmp error_exit
+
+#        ALIGN
+restore_all_enable_events:  
+       XEN_UNBLOCK_EVENTS(%rsi)        # %rsi is already set up...
+
+scrit: /**** START OF CRITICAL REGION ****/
+       XEN_TEST_PENDING(%rsi)
+       jnz  14f                        # process more events if necessary...
+       XEN_PUT_VCPU_INFO(%rsi)
+        RESTORE_ARGS 0,8,0
+        HYPERVISOR_IRET 0
+        
+14:    XEN_LOCKED_BLOCK_EVENTS(%rsi)
+       XEN_PUT_VCPU_INFO(%rsi)
+       SAVE_REST
+        movq %rsp,%rdi                  # set the argument again
+       jmp  11b
+ecrit:  /**** END OF CRITICAL REGION ****/
+
+
+retint_kernel:
+retint_restore_args:
+       movl EFLAGS-REST_SKIP(%rsp), %eax
+       shr $9, %eax                    # EAX[0] == IRET_EFLAGS.IF
+       XEN_GET_VCPU_INFO(%rsi)
+       andb evtchn_upcall_mask(%rsi),%al
+       andb $1,%al                     # EAX[0] == IRET_EFLAGS.IF & event_mask
+       jnz restore_all_enable_events   #        != 0 => enable event delivery
+       XEN_PUT_VCPU_INFO(%rsi)
+               
+       RESTORE_ARGS 0,8,0
+       HYPERVISOR_IRET 0
+
+
+error_exit:            
+       RESTORE_REST
+/*     cli */
+       XEN_BLOCK_EVENTS(%rsi)          
+       jmp retint_kernel
+
+
+
+ENTRY(failsafe_callback)
+        popq  %rcx
+        popq  %r11
+        iretq
+
+
+ENTRY(coprocessor_error)
+        zeroentry do_coprocessor_error
+
+
+ENTRY(simd_coprocessor_error)
+        zeroentry do_simd_coprocessor_error
+
+
+ENTRY(device_not_available)
+        zeroentry do_device_not_available
+
+
+ENTRY(debug)
+#       INTR_FRAME
+#       CFI_ADJUST_CFA_OFFSET 8 */
+        zeroentry do_debug
+#       CFI_ENDPROC
+
+
+ENTRY(int3)
+#       INTR_FRAME
+#       CFI_ADJUST_CFA_OFFSET 8 */
+        zeroentry do_int3
+#       CFI_ENDPROC
+
+ENTRY(overflow)
+        zeroentry do_overflow
+
+
+ENTRY(bounds)
+        zeroentry do_bounds
+    
+    
+ENTRY(invalid_op)
+        zeroentry do_invalid_op
+
+
+ENTRY(coprocessor_segment_overrun)
+        zeroentry do_coprocessor_segment_overrun
+
+
+ENTRY(invalid_TSS)
+        errorentry do_invalid_TSS
+
+
+ENTRY(segment_not_present)
+        errorentry do_segment_not_present
+
+
+/* runs on exception stack */
+ENTRY(stack_segment)
+#       XCPT_FRAME
+        errorentry do_stack_segment
+#       CFI_ENDPROC
+                    
+
+ENTRY(general_protection)
+        errorentry do_general_protection
+
+
+ENTRY(alignment_check)
+        errorentry do_alignment_check
+
+
+ENTRY(divide_error)
+        zeroentry do_divide_error
+
+
+ENTRY(spurious_interrupt_bug)
+        zeroentry do_spurious_interrupt_bug
+            
+
+ENTRY(page_fault)
+        errorentry do_page_fault
+
+
+
+
+
+ENTRY(thread_starter)
+        popq %rdi
+        popq %rbx
+        call *%rbx
+        call exit_thread 
+        
+
diff -r 120d882a4d8e -r 8690e3448971 extras/mini-os/minios-x86_32.lds
--- a/extras/mini-os/minios-x86_32.lds  Wed Jan 17 15:03:27 2007 +0000
+++ /dev/null   Thu Jan 01 00:00:00 1970 +0000
@@ -1,45 +0,0 @@
-OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
-OUTPUT_ARCH(i386)
-ENTRY(_start)
-SECTIONS
-{
-  . = 0x0;
-  _text = .;                   /* Text and read-only data */
-  .text : {
-       *(.text)
-       *(.gnu.warning)
-       } = 0x9090
-
-  _etext = .;                  /* End of text section */
-
-  .rodata : { *(.rodata) *(.rodata.*) }
-
-  .data : {                    /* Data */
-       *(.data)
-       CONSTRUCTORS
-       }
-
-  _edata = .;                  /* End of data section */
-
-  __bss_start = .;             /* BSS */
-  .bss : {
-       *(.bss)
-       }
-  _end = . ;
-
-  /* Sections to be discarded */
-  /DISCARD/ : {
-       *(.text.exit)
-       *(.data.exit)
-       *(.exitcall.exit)
-       }
-
-  /* Stabs debugging sections.  */
-  .stab 0 : { *(.stab) }
-  .stabstr 0 : { *(.stabstr) }
-  .stab.excl 0 : { *(.stab.excl) }
-  .stab.exclstr 0 : { *(.stab.exclstr) }
-  .stab.index 0 : { *(.stab.index) }
-  .stab.indexstr 0 : { *(.stab.indexstr) }
-  .comment 0 : { *(.comment) }
-}
diff -r 120d882a4d8e -r 8690e3448971 extras/mini-os/minios-x86_64.lds
--- a/extras/mini-os/minios-x86_64.lds  Wed Jan 17 15:03:27 2007 +0000
+++ /dev/null   Thu Jan 01 00:00:00 1970 +0000
@@ -1,54 +0,0 @@
-OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
-OUTPUT_ARCH(i386:x86-64)
-ENTRY(_start)
-SECTIONS
-{
-  . = 0x0;
-  _text = .;                   /* Text and read-only data */
-  .text : {
-       *(.text)
-       *(.gnu.warning)
-       } = 0x9090
-
-  _etext = .;                  /* End of text section */
-
-  .rodata : { *(.rodata) *(.rodata.*) }
-
-  .data : {                    /* Data */
-       *(.data)
-       CONSTRUCTORS
-       }
-
-  _edata = .;                  /* End of data section */
-
-  . = ALIGN(8192);             /* init_task */
-  .data.init_task : { *(.data.init_task) }
-
-  . = ALIGN(4096);
-  .data.page_aligned : { *(.data.idt) }
-
-  . = ALIGN(32);
-  .data.cacheline_aligned : { *(.data.cacheline_aligned) }
-
-  __bss_start = .;             /* BSS */
-  .bss : {
-       *(.bss)
-       }
-  _end = . ;
-
-  /* Sections to be discarded */
-  /DISCARD/ : {
-       *(.text.exit)
-       *(.data.exit)
-       *(.exitcall.exit)
-       }
-
-  /* Stabs debugging sections.  */
-  .stab 0 : { *(.stab) }
-  .stabstr 0 : { *(.stabstr) }
-  .stab.excl 0 : { *(.stab.excl) }
-  .stab.exclstr 0 : { *(.stab.exclstr) }
-  .stab.index 0 : { *(.stab.index) }
-  .stab.indexstr 0 : { *(.stab.indexstr) }
-  .comment 0 : { *(.comment) }
-}
diff -r 120d882a4d8e -r 8690e3448971 extras/mini-os/minios.mk
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/extras/mini-os/minios.mk  Wed Jan 17 15:09:50 2007 +0000
@@ -0,0 +1,62 @@
+#
+# The file contains the common make rules for building mini-os.
+#
+
+debug = y
+
+# Define some default flags.
+# NB. '-Wcast-qual' is nasty, so I omitted it.
+DEF_CFLAGS := -fno-builtin -Wall -Werror -Wredundant-decls -Wno-format
+DEF_CFLAGS += -Wstrict-prototypes -Wnested-externs -Wpointer-arith -Winline
+DEF_CFLAGS += -D__XEN_INTERFACE_VERSION__=$(XEN_INTERFACE_VERSION)
+
+DEF_ASFLAGS = -D__ASSEMBLY__
+
+ifeq ($(debug),y)
+DEF_CFLAGS += -g
+else
+DEF_CFLAGS += -O3
+endif
+
+# Build the CFLAGS and ASFLAGS for compiling and assembling.
+# DEF_... flags are the common mini-os flags,
+# ARCH_... flags may be defined in arch/$(TARGET_ARCH_FAM/rules.mk
+CFLAGS := $(DEF_CFLAGS) $(ARCH_CFLAGS)
+ASFLAGS := $(DEF_ASFLAGS) $(ARCH_ASFLAGS)
+
+# The path pointing to the architecture specific header files.
+ARCH_SPEC_INC := $(MINI-OS_ROOT)/include/$(TARGET_ARCH_FAM)
+
+# Find all header files for checking dependencies.
+HDRS := $(wildcard $(MINI-OS_ROOT)/include/*.h)
+HDRS += $(wildcard $(MINI-OS_ROOT)/include/xen/*.h)
+HDRS += $(wildcard $(ARCH_SPEC_INC)/*.h)
+# For special wanted header directories.
+extra_heads := $(foreach dir,$(EXTRA_INC),$(wildcard $(dir)/*.h))
+HDRS += $(extra_heads)
+
+# Add the special header directories to the include paths.
+extra_incl := $(foreach dir,$(EXTRA_INC),-I$(MINI-OS_ROOT)/include/$(dir))
+override CPPFLAGS := -I$(MINI-OS_ROOT)/include $(CPPFLAGS) -I$(ARCH_SPEC_INC)  
$(extra_incl)
+
+# The name of the architecture specific library.
+# This is on x86_32: libx86_32.a
+# $(ARCH_LIB) has to built in the architecture specific directory.
+ARCH_LIB_NAME = $(TARGET_ARCH)
+ARCH_LIB := lib$(ARCH_LIB_NAME).a
+
+# This object contains the entrypoint for startup from Xen.
+# $(HEAD_ARCH_OBJ) has to be built in the architecture specific directory.
+HEAD_ARCH_OBJ := $(TARGET_ARCH).o
+HEAD_OBJ := $(TARGET_ARCH_DIR)/$(HEAD_ARCH_OBJ)
+
+
+%.o: %.c $(HDRS) Makefile $(SPEC_DEPENDS)
+       $(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
+
+%.o: %.S $(HDRS) Makefile $(SPEC_DEPENDS)
+       $(CC) $(ASFLAGS) $(CPPFLAGS) -c $< -o $@
+
+
+
+
diff -r 120d882a4d8e -r 8690e3448971 extras/mini-os/x86_32.S
--- a/extras/mini-os/x86_32.S   Wed Jan 17 15:03:27 2007 +0000
+++ /dev/null   Thu Jan 01 00:00:00 1970 +0000
@@ -1,287 +0,0 @@
-#include <os.h>
-#include <xen/arch-x86_32.h>
-
-.section __xen_guest
-       .ascii  "GUEST_OS=Mini-OS"
-       .ascii  ",XEN_VER=xen-3.0"
-       .ascii  ",VIRT_BASE=0x0" /* &_text from minios_x86_32.lds */
-       .ascii  ",ELF_PADDR_OFFSET=0x0"
-       .ascii  ",HYPERCALL_PAGE=0x2"
-#ifdef CONFIG_X86_PAE
-       .ascii  ",PAE=yes"
-#else
-       .ascii  ",PAE=no"
-#endif
-       .ascii  ",LOADER=generic"
-       .byte   0
-.text
-
-.globl _start, shared_info, hypercall_page
-                        
-_start:
-        cld
-        lss stack_start,%esp
-        push %esi 
-        call start_kernel
-
-stack_start:
-       .long stack+8192, __KERNEL_SS
-
-        /* Unpleasant -- the PTE that maps this page is actually overwritten */
-        /* to map the real shared-info page! :-)                             */
-        .org 0x1000
-shared_info:
-        .org 0x2000
-
-hypercall_page:
-        .org 0x3000
-
-ES             = 0x20
-ORIG_EAX       = 0x24
-EIP            = 0x28
-CS             = 0x2C
-
-#define ENTRY(X) .globl X ; X :
-
-#define SAVE_ALL \
-       cld; \
-       pushl %es; \
-       pushl %ds; \
-       pushl %eax; \
-       pushl %ebp; \
-       pushl %edi; \
-       pushl %esi; \
-       pushl %edx; \
-       pushl %ecx; \
-       pushl %ebx; \
-       movl $(__KERNEL_DS),%edx; \
-       movl %edx,%ds; \
-       movl %edx,%es;
-
-#define RESTORE_ALL    \
-       popl %ebx;      \
-       popl %ecx;      \
-       popl %edx;      \
-       popl %esi;      \
-       popl %edi;      \
-       popl %ebp;      \
-       popl %eax;      \
-       popl %ds;       \
-       popl %es;       \
-       addl $4,%esp;   \
-       iret;           \
-
-ENTRY(divide_error)
-       pushl $0                # no error code
-       pushl $do_divide_error
-do_exception:
-    pushl %ds
-       pushl %eax
-       xorl %eax, %eax
-       pushl %ebp
-       pushl %edi
-       pushl %esi
-       pushl %edx
-       decl %eax                       # eax = -1
-       pushl %ecx
-       pushl %ebx
-       cld
-       movl %es, %ecx
-       movl ES(%esp), %edi             # get the function address
-       movl ORIG_EAX(%esp), %edx       # get the error code
-       movl %eax, ORIG_EAX(%esp)
-       movl %ecx, ES(%esp)
-       movl $(__KERNEL_DS), %ecx
-       movl %ecx, %ds
-       movl %ecx, %es
-       movl %esp,%eax                  # pt_regs pointer
-    pushl %edx
-    pushl %eax
-       call *%edi
-    jmp ret_from_exception
-    
-ret_from_exception:
-        movb CS(%esp),%cl
-       test $2,%cl          # slow return to ring 2 or 3
-       jne  safesti
-        RESTORE_ALL
-
-# A note on the "critical region" in our callback handler.
-# We want to avoid stacking callback handlers due to events occurring
-# during handling of the last event. To do this, we keep events disabled
-# until weve done all processing. HOWEVER, we must enable events before
-# popping the stack frame (cant be done atomically) and so it would still
-# be possible to get enough handler activations to overflow the stack.
-# Although unlikely, bugs of that kind are hard to track down, so wed
-# like to avoid the possibility.
-# So, on entry to the handler we detect whether we interrupted an
-# existing activation in its critical region -- if so, we pop the current
-# activation and restart the handler using the previous one.
-ENTRY(hypervisor_callback)
-        pushl %eax
-        SAVE_ALL
-        movl EIP(%esp),%eax
-        cmpl $scrit,%eax
-        jb   11f
-        cmpl $ecrit,%eax
-        jb   critical_region_fixup
-11:     push %esp
-        call do_hypervisor_callback
-        add  $4,%esp
-        movl HYPERVISOR_shared_info,%esi
-        xorl %eax,%eax
-        movb CS(%esp),%cl
-       test $2,%cl          # slow return to ring 2 or 3
-        jne  safesti
-safesti:movb $0,1(%esi)     # reenable event callbacks
-scrit:  /**** START OF CRITICAL REGION ****/
-        testb $0xFF,(%esi)
-        jnz  14f              # process more events if necessary...
-        RESTORE_ALL
-14:     movb $1,1(%esi)
-        jmp  11b
-ecrit:  /**** END OF CRITICAL REGION ****/
-# [How we do the fixup]. We want to merge the current stack frame with the
-# just-interrupted frame. How we do this depends on where in the critical
-# region the interrupted handler was executing, and so how many saved
-# registers are in each frame. We do this quickly using the lookup table
-# 'critical_fixup_table'. For each byte offset in the critical region, it
-# provides the number of bytes which have already been popped from the
-# interrupted stack frame. 
-critical_region_fixup:
-        addl $critical_fixup_table-scrit,%eax
-        movzbl (%eax),%eax    # %eax contains num bytes popped
-        mov  %esp,%esi
-        add  %eax,%esi        # %esi points at end of src region
-        mov  %esp,%edi
-        add  $0x34,%edi       # %edi points at end of dst region
-        mov  %eax,%ecx
-        shr  $2,%ecx          # convert words to bytes
-        je   16f              # skip loop if nothing to copy
-15:     subl $4,%esi          # pre-decrementing copy loop
-        subl $4,%edi
-        movl (%esi),%eax
-        movl %eax,(%edi)
-        loop 15b
-16:     movl %edi,%esp        # final %edi is top of merged stack
-        jmp  11b
-         
-critical_fixup_table:        
-        .byte 0x00,0x00,0x00                  # testb $0xff,(%esi)
-        .byte 0x00,0x00                       # jne  14f
-        .byte 0x00                            # pop  %ebx
-        .byte 0x04                            # pop  %ecx
-        .byte 0x08                            # pop  %edx
-        .byte 0x0c                            # pop  %esi
-        .byte 0x10                            # pop  %edi
-        .byte 0x14                            # pop  %ebp
-        .byte 0x18                            # pop  %eax
-        .byte 0x1c                            # pop  %ds
-        .byte 0x20                            # pop  %es
-        .byte 0x24,0x24,0x24                  # add  $4,%esp
-        .byte 0x28                            # iret
-        .byte 0x00,0x00,0x00,0x00             # movb $1,1(%esi)
-        .byte 0x00,0x00                       # jmp  11b
-       
-# Hypervisor uses this for application faults while it executes.
-ENTRY(failsafe_callback)
-      pop  %ds
-      pop  %es
-      pop  %fs
-      pop  %gs
-      iret
-                
-ENTRY(coprocessor_error)
-       pushl $0
-       pushl $do_coprocessor_error
-       jmp do_exception
-
-ENTRY(simd_coprocessor_error)
-       pushl $0
-       pushl $do_simd_coprocessor_error
-       jmp do_exception
-
-ENTRY(device_not_available)
-        iret
-
-ENTRY(debug)
-       pushl $0
-       pushl $do_debug
-       jmp do_exception
-
-ENTRY(int3)
-       pushl $0
-       pushl $do_int3
-       jmp do_exception
-
-ENTRY(overflow)
-       pushl $0
-       pushl $do_overflow
-       jmp do_exception
-
-ENTRY(bounds)
-       pushl $0
-       pushl $do_bounds
-       jmp do_exception
-
-ENTRY(invalid_op)
-       pushl $0
-       pushl $do_invalid_op
-       jmp do_exception
-
-
-ENTRY(coprocessor_segment_overrun)
-       pushl $0
-       pushl $do_coprocessor_segment_overrun
-       jmp do_exception
-
-
-ENTRY(invalid_TSS)
-       pushl $do_invalid_TSS
-       jmp do_exception
-
-
-ENTRY(segment_not_present)
-       pushl $do_segment_not_present
-       jmp do_exception
-
-
-ENTRY(stack_segment)
-       pushl $do_stack_segment
-       jmp do_exception
-
-
-ENTRY(general_protection)
-       pushl $do_general_protection
-       jmp do_exception
-
-
-ENTRY(alignment_check)
-       pushl $do_alignment_check
-       jmp do_exception
-
-
-ENTRY(page_fault)
-    pushl $do_page_fault
-    jmp do_exception
-    
-ENTRY(machine_check)
-       pushl $0
-       pushl $do_machine_check
-       jmp do_exception
-
-
-ENTRY(spurious_interrupt_bug)
-       pushl $0
-       pushl $do_spurious_interrupt_bug
-       jmp do_exception
-
-
-
-ENTRY(thread_starter)
-    popl %eax
-    popl %ebx
-    pushl %eax
-    call *%ebx
-    call exit_thread 
-    
diff -r 120d882a4d8e -r 8690e3448971 extras/mini-os/x86_64.S
--- a/extras/mini-os/x86_64.S   Wed Jan 17 15:03:27 2007 +0000
+++ /dev/null   Thu Jan 01 00:00:00 1970 +0000
@@ -1,385 +0,0 @@
-#include <os.h>
-#include <xen/features.h>
-
-.section __xen_guest
-       .ascii  "GUEST_OS=Mini-OS"
-       .ascii  ",XEN_VER=xen-3.0"
-       .ascii  ",VIRT_BASE=0x0" /* &_text from minios_x86_64.lds */
-       .ascii  ",ELF_PADDR_OFFSET=0x0"
-       .ascii  ",HYPERCALL_PAGE=0x2"
-       .ascii  ",LOADER=generic"
-       .byte   0
-.text
-
-#define ENTRY(X) .globl X ; X :
-.globl _start, shared_info, hypercall_page
-
-
-_start:
-        cld
-        movq stack_start(%rip),%rsp
-        movq %rsi,%rdi
-        call start_kernel
-
-stack_start:
-        .quad stack+8192
-
-        /* Unpleasant -- the PTE that maps this page is actually overwritten */
-        /* to map the real shared-info page! :-)                             */
-        .org 0x1000
-shared_info:
-        .org 0x2000
-
-hypercall_page:
-        .org 0x3000
-
-
-/* Offsets into shared_info_t. */                
-#define evtchn_upcall_pending          /* 0 */
-#define evtchn_upcall_mask             1
-
-NMI_MASK = 0x80000000
-
-#define RDI 112
-#define ORIG_RAX 120       /* + error_code */ 
-#define EFLAGS 144
-
-#define REST_SKIP 6*8                  
-.macro SAVE_REST
-       subq $REST_SKIP,%rsp
-#      CFI_ADJUST_CFA_OFFSET   REST_SKIP
-       movq %rbx,5*8(%rsp) 
-#      CFI_REL_OFFSET  rbx,5*8
-       movq %rbp,4*8(%rsp) 
-#      CFI_REL_OFFSET  rbp,4*8
-       movq %r12,3*8(%rsp) 
-#      CFI_REL_OFFSET  r12,3*8
-       movq %r13,2*8(%rsp) 
-#      CFI_REL_OFFSET  r13,2*8
-       movq %r14,1*8(%rsp) 
-#      CFI_REL_OFFSET  r14,1*8
-       movq %r15,(%rsp) 
-#      CFI_REL_OFFSET  r15,0*8
-.endm          
-
-
-.macro RESTORE_REST
-       movq (%rsp),%r15
-#      CFI_RESTORE r15
-       movq 1*8(%rsp),%r14
-#      CFI_RESTORE r14
-       movq 2*8(%rsp),%r13
-#      CFI_RESTORE r13
-       movq 3*8(%rsp),%r12
-#      CFI_RESTORE r12
-       movq 4*8(%rsp),%rbp
-#      CFI_RESTORE rbp
-       movq 5*8(%rsp),%rbx
-#      CFI_RESTORE rbx
-       addq $REST_SKIP,%rsp
-#      CFI_ADJUST_CFA_OFFSET   -(REST_SKIP)
-.endm
-
-
-#define ARG_SKIP 9*8
-.macro RESTORE_ARGS 
skiprax=0,addskip=0,skiprcx=0,skipr11=0,skipr8910=0,skiprdx=0
-       .if \skipr11
-       .else
-       movq (%rsp),%r11
-#      CFI_RESTORE r11
-       .endif
-       .if \skipr8910
-       .else
-       movq 1*8(%rsp),%r10
-#      CFI_RESTORE r10
-       movq 2*8(%rsp),%r9
-#      CFI_RESTORE r9
-       movq 3*8(%rsp),%r8
-#      CFI_RESTORE r8
-       .endif
-       .if \skiprax
-       .else
-       movq 4*8(%rsp),%rax
-#      CFI_RESTORE rax
-       .endif
-       .if \skiprcx
-       .else
-       movq 5*8(%rsp),%rcx
-#      CFI_RESTORE rcx
-       .endif
-       .if \skiprdx
-       .else
-       movq 6*8(%rsp),%rdx
-#      CFI_RESTORE rdx
-       .endif
-       movq 7*8(%rsp),%rsi
-#      CFI_RESTORE rsi
-       movq 8*8(%rsp),%rdi
-#      CFI_RESTORE rdi
-       .if ARG_SKIP+\addskip > 0
-       addq $ARG_SKIP+\addskip,%rsp
-#      CFI_ADJUST_CFA_OFFSET   -(ARG_SKIP+\addskip)
-       .endif
-.endm  
-
-
-.macro HYPERVISOR_IRET flag
-#    testb $3,1*8(%rsp)    /* Don't need to do that in Mini-os, as */
-#      jnz   2f               /* there is no userspace? */
-       testl $NMI_MASK,2*8(%rsp)
-       jnz   2f
-
-       testb $1,(xen_features+XENFEAT_supervisor_mode_kernel)
-       jnz   1f
-
-       /* Direct iret to kernel space. Correct CS and SS. */
-       orb   $3,1*8(%rsp)
-       orb   $3,4*8(%rsp)
-1:     iretq
-
-2:     /* Slow iret via hypervisor. */
-       andl  $~NMI_MASK, 16(%rsp)
-       pushq $\flag
-       jmp  hypercall_page + (__HYPERVISOR_iret * 32)
-.endm
-
-/*
- * Exception entry point. This expects an error code/orig_rax on the stack
- * and the exception handler in %rax.  
- */                                            
-ENTRY(error_entry)
-#      _frame RDI
-       /* rdi slot contains rax, oldrax contains error code */
-       cld     
-       subq  $14*8,%rsp
-#      CFI_ADJUST_CFA_OFFSET   (14*8)
-       movq %rsi,13*8(%rsp)
-#      CFI_REL_OFFSET  rsi,RSI
-       movq 14*8(%rsp),%rsi    /* load rax from rdi slot */
-       movq %rdx,12*8(%rsp)
-#      CFI_REL_OFFSET  rdx,RDX
-       movq %rcx,11*8(%rsp)
-#      CFI_REL_OFFSET  rcx,RCX
-       movq %rsi,10*8(%rsp)    /* store rax */ 
-#      CFI_REL_OFFSET  rax,RAX
-       movq %r8, 9*8(%rsp)
-#      CFI_REL_OFFSET  r8,R8
-       movq %r9, 8*8(%rsp)
-#      CFI_REL_OFFSET  r9,R9
-       movq %r10,7*8(%rsp)
-#      CFI_REL_OFFSET  r10,R10
-       movq %r11,6*8(%rsp)
-#      CFI_REL_OFFSET  r11,R11
-       movq %rbx,5*8(%rsp) 
-#      CFI_REL_OFFSET  rbx,RBX
-       movq %rbp,4*8(%rsp) 
-#      CFI_REL_OFFSET  rbp,RBP
-       movq %r12,3*8(%rsp) 
-#      CFI_REL_OFFSET  r12,R12
-       movq %r13,2*8(%rsp) 
-#      CFI_REL_OFFSET  r13,R13
-       movq %r14,1*8(%rsp) 
-#      CFI_REL_OFFSET  r14,R14
-       movq %r15,(%rsp) 
-#      CFI_REL_OFFSET  r15,R15
-#if 0        
-       cmpl $__KERNEL_CS,CS(%rsp)
-       je  error_kernelspace
-#endif        
-error_call_handler:
-       movq %rdi, RDI(%rsp)            
-       movq %rsp,%rdi
-       movq ORIG_RAX(%rsp),%rsi        # get error code 
-       movq $-1,ORIG_RAX(%rsp)
-       call *%rax
-
-.macro zeroentry sym
-#      INTR_FRAME
-    movq (%rsp),%rcx
-    movq 8(%rsp),%r11
-    addq $0x10,%rsp /* skip rcx and r11 */
-       pushq $0        /* push error code/oldrax */ 
-#      CFI_ADJUST_CFA_OFFSET 8
-       pushq %rax      /* push real oldrax to the rdi slot */ 
-#      CFI_ADJUST_CFA_OFFSET 8
-       leaq  \sym(%rip),%rax
-       jmp error_entry
-#      CFI_ENDPROC
-.endm  
-
-.macro errorentry sym
-#      XCPT_FRAME
-        movq (%rsp),%rcx
-        movq 8(%rsp),%r11
-        addq $0x10,%rsp /* rsp points to the error code */
-       pushq %rax
-#      CFI_ADJUST_CFA_OFFSET 8
-       leaq  \sym(%rip),%rax
-       jmp error_entry
-#      CFI_ENDPROC
-.endm
-
-#define XEN_GET_VCPU_INFO(reg) movq HYPERVISOR_shared_info,reg
-#define XEN_PUT_VCPU_INFO(reg)
-#define XEN_PUT_VCPU_INFO_fixup
-#define XEN_LOCKED_BLOCK_EVENTS(reg)   movb $1,evtchn_upcall_mask(reg)
-#define XEN_LOCKED_UNBLOCK_EVENTS(reg) movb $0,evtchn_upcall_mask(reg)
-#define XEN_TEST_PENDING(reg)  testb $0xFF,evtchn_upcall_pending(reg)
-
-#define XEN_BLOCK_EVENTS(reg)  XEN_GET_VCPU_INFO(reg)                  ; \
-                                       XEN_LOCKED_BLOCK_EVENTS(reg)    ; \
-                                           XEN_PUT_VCPU_INFO(reg)
-
-#define XEN_UNBLOCK_EVENTS(reg)        XEN_GET_VCPU_INFO(reg)                  
; \
-                                               XEN_LOCKED_UNBLOCK_EVENTS(reg)  
; \
-                                       XEN_PUT_VCPU_INFO(reg)
-
-
-
-ENTRY(hypervisor_callback)
-    zeroentry hypervisor_callback2
-
-ENTRY(hypervisor_callback2)
-        movq %rdi, %rsp 
-11:     movq %gs:8,%rax
-        incl %gs:0
-        cmovzq %rax,%rsp
-        pushq %rdi
-        call do_hypervisor_callback 
-        popq %rsp
-        decl %gs:0
-        jmp error_exit
-
-#        ALIGN
-restore_all_enable_events:  
-       XEN_UNBLOCK_EVENTS(%rsi)        # %rsi is already set up...
-
-scrit: /**** START OF CRITICAL REGION ****/
-       XEN_TEST_PENDING(%rsi)
-       jnz  14f                        # process more events if necessary...
-       XEN_PUT_VCPU_INFO(%rsi)
-        RESTORE_ARGS 0,8,0
-        HYPERVISOR_IRET 0
-        
-14:    XEN_LOCKED_BLOCK_EVENTS(%rsi)
-       XEN_PUT_VCPU_INFO(%rsi)
-       SAVE_REST
-        movq %rsp,%rdi                  # set the argument again
-       jmp  11b
-ecrit:  /**** END OF CRITICAL REGION ****/
-
-
-retint_kernel:
-retint_restore_args:
-       movl EFLAGS-REST_SKIP(%rsp), %eax
-       shr $9, %eax                    # EAX[0] == IRET_EFLAGS.IF
-       XEN_GET_VCPU_INFO(%rsi)
-       andb evtchn_upcall_mask(%rsi),%al
-       andb $1,%al                     # EAX[0] == IRET_EFLAGS.IF & event_mask
-       jnz restore_all_enable_events   #        != 0 => enable event delivery
-       XEN_PUT_VCPU_INFO(%rsi)
-               
-       RESTORE_ARGS 0,8,0
-       HYPERVISOR_IRET 0
-
-
-error_exit:            
-       RESTORE_REST
-/*     cli */
-       XEN_BLOCK_EVENTS(%rsi)          
-       jmp retint_kernel
-
-
-
-ENTRY(failsafe_callback)
-        popq  %rcx
-        popq  %r11
-        iretq
-
-
-ENTRY(coprocessor_error)
-        zeroentry do_coprocessor_error
-
-
-ENTRY(simd_coprocessor_error)
-        zeroentry do_simd_coprocessor_error
-
-
-ENTRY(device_not_available)
-        zeroentry do_device_not_available
-
-
-ENTRY(debug)
-#       INTR_FRAME
-#       CFI_ADJUST_CFA_OFFSET 8 */
-        zeroentry do_debug
-#       CFI_ENDPROC
-
-
-ENTRY(int3)
-#       INTR_FRAME
-#       CFI_ADJUST_CFA_OFFSET 8 */
-        zeroentry do_int3
-#       CFI_ENDPROC
-
-ENTRY(overflow)
-        zeroentry do_overflow
-
-
-ENTRY(bounds)
-        zeroentry do_bounds
-    
-    
-ENTRY(invalid_op)
-        zeroentry do_invalid_op
-
-
-ENTRY(coprocessor_segment_overrun)
-        zeroentry do_coprocessor_segment_overrun
-
-
-ENTRY(invalid_TSS)
-        errorentry do_invalid_TSS
-
-
-ENTRY(segment_not_present)
-        errorentry do_segment_not_present
-
-
-/* runs on exception stack */
-ENTRY(stack_segment)
-#       XCPT_FRAME
-        errorentry do_stack_segment
-#       CFI_ENDPROC
-                    
-
-ENTRY(general_protection)
-        errorentry do_general_protection
-
-
-ENTRY(alignment_check)
-        errorentry do_alignment_check
-
-
-ENTRY(divide_error)
-        zeroentry do_divide_error
-
-
-ENTRY(spurious_interrupt_bug)
-        zeroentry do_spurious_interrupt_bug
-            
-
-ENTRY(page_fault)
-        errorentry do_page_fault
-
-
-
-
-
-ENTRY(thread_starter)
-        popq %rdi
-        popq %rbx
-        call *%rbx
-        call exit_thread 
-        
-

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