Add stubdomain support. See stubdom/README for usage details.

- Move PAGE_SIZE and STACK_SIZE into __PAGE_SIZE and __STACK_SIZE in
  arch_limits.h so as to permit getting them from there without
  pulling all the internal Mini-OS defines.
- Setup a xen-elf cross-compilation environment in stubdom/cross-root
- Add a POSIX layer on top of Mini-OS by linking against the newlib C
  library and lwIP, and implementing the Unixish part in mini-os/lib/sys.c
- Cross-compile zlib and libpci too.
- Add an xs.h-compatible layer on top of Mini-OS' xenbus.
- Cross-compile libxc with an additional xc_minios.c and a few things
  disabled.
- Cross-compile ioemu with an additional block-vbd, but without sound,
  tpm and other details.  A few hacks are needed:
  - Align ide and scsi buffers at least on sector size to permit
  direct transmission to the block backend. While we are at it, just
  page-align it to possibly save a segment. Also, limit the scsi
  buffer size because of limitations of the block paravirtualization
  protocol.
  - Allocate big tables dynamically rather that letting them go to
  bss: when Mini-OS gets installed in memory, bss is not lazily
  allocated, and doing so during Mini-OS is unnecessarily trick while
  we can simply use malloc.
- Had to change the Mini-OS compilation somehow, so as to export
  Mini-OS compilation flags to the Makefiles of libxc and ioemu.

Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>

10 files changed, 76 insertions, 12 deletions

diff --git a/extras/mini-os/arch/ia64/Makefile b/extras/mini-os/arch/ia64/Makefile
index fb5ca9fb72..6e46aa67ef 100644
--- a/extras/mini-os/arch/ia64/Makefile
+++ b/extras/mini-os/arch/ia64/Makefile
@@ -5,6 +5,8 @@
 XEN_ROOT = ../../../..
 include $(XEN_ROOT)/Config.mk
 
+include ../../Config.mk
+
 include arch.mk
 include ../../minios.mk
 
@@ -41,7 +43,7 @@ ARCH_OBJS += __divdi3.o
 
 GEN_OFF_SRC := gen_off.c
 GEN_OFF_ASM := gen_off.s
-GEN_OFF_H   := $(ARCH_INC)/offsets.h
+GEN_OFF_H   := $(MINI-OS_ROOT)/include/$(ARCH_INC)/offsets.h
 
 all: $(ARCH_LIB)
 
diff --git a/extras/mini-os/arch/ia64/minios-ia64.lds b/extras/mini-os/arch/ia64/minios-ia64.lds
index 70435de11e..96911aa3fd 100644
--- a/extras/mini-os/arch/ia64/minios-ia64.lds
+++ b/extras/mini-os/arch/ia64/minios-ia64.lds
@@ -40,6 +40,18 @@ SECTIONS
   .rodata.str1.8 : AT(ADDR(.rodata.str1.8) - (((5<<(61))+0x100000000) - (1 << 20)))
   { *(.rodata.str1.8) }
 
+  /* newlib initialization functions */
+  . = ALIGN(64 / 8);
+  PROVIDE (__preinit_array_start = .);
+  .preinit_array     : { *(.preinit_array) }
+  PROVIDE (__preinit_array_end = .);
+  PROVIDE (__init_array_start = .);
+  .init_array     : { *(.init_array) }
+  PROVIDE (__init_array_end = .);
+  PROVIDE (__fini_array_start = .);
+  .fini_array     : { *(.fini_array) }
+  PROVIDE (__fini_array_end = .);
+
   .IA_64.unwind_info : AT(ADDR(.IA_64.unwind_info) - (((5<<(61))+0x100000000) - (1 << 20)))
   { *(.IA_64.unwind_info) }
 
diff --git a/extras/mini-os/arch/ia64/mm.c b/extras/mini-os/arch/ia64/mm.c
index f557730257..f2291f918c 100644
--- a/extras/mini-os/arch/ia64/mm.c
+++ b/extras/mini-os/arch/ia64/mm.c
@@ -43,6 +43,14 @@ extern uint64_t _text[], _etext[], _end[], kstack[], phys_start[];
 
 uint64_t kernstart, kernend, kernsize, kernpstart, kernpend;
 
+#ifdef HAVE_LIBC
+uint8_t _heap[512 * 1024];
+unsigned long heap = (unsigned long)_heap,
+              brk = (unsigned long)_heap,
+              heap_mapped = (unsigned long)_heap + sizeof(_heap),
+              heap_end = (unsigned long)_heap + sizeof(_heap);
+#endif
+
 /* Print the available memory chunks. */
 static void
 print_phys_avail(void)
diff --git a/extras/mini-os/arch/x86/Makefile b/extras/mini-os/arch/x86/Makefile
index 22cfe82811..21f0958f6a 100644
--- a/extras/mini-os/arch/x86/Makefile
+++ b/extras/mini-os/arch/x86/Makefile
@@ -5,13 +5,14 @@
 
 XEN_ROOT = ../../../..
 include $(XEN_ROOT)/Config.mk
+include ../../Config.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
+# Sources here are all *.c *.S without $(XEN_TARGET_ARCH).S
 # This is handled in $(HEAD_ARCH_OBJ)
 ARCH_SRCS := $(wildcard *.c)
 
diff --git a/extras/mini-os/arch/x86/arch.mk b/extras/mini-os/arch/x86/arch.mk
index dd6bfe0b8d..1680362789 100644
--- a/extras/mini-os/arch/x86/arch.mk
+++ b/extras/mini-os/arch/x86/arch.mk
@@ -3,11 +3,11 @@
 # (including x86_32, x86_32y and x86_64).
 #
 
-ifeq ($(TARGET_ARCH),x86_32)
+ifeq ($(XEN_TARGET_ARCH),x86_32)
 ARCH_CFLAGS  := -m32 -march=i686
 ARCH_LDFLAGS := -m elf_i386
 ARCH_ASFLAGS := -m32
-EXTRA_INC += $(TARGET_ARCH_FAM)/$(TARGET_ARCH)
+EXTRA_INC += $(TARGET_ARCH_FAM)/$(XEN_TARGET_ARCH)
 EXTRA_SRC += arch/$(EXTRA_INC)
 
 ifeq ($(XEN_TARGET_X86_PAE),y)
@@ -16,12 +16,12 @@ ARCH_ASFLAGS += -DCONFIG_X86_PAE=1
 endif
 endif
 
-ifeq ($(TARGET_ARCH),x86_64)
+ifeq ($(XEN_TARGET_ARCH),x86_64)
 ARCH_CFLAGS := -m64 -mno-red-zone -fno-reorder-blocks
 ARCH_CFLAGS += -fno-asynchronous-unwind-tables
 ARCH_ASFLAGS := -m64
 ARCH_LDFLAGS := -m elf_x86_64
-EXTRA_INC += $(TARGET_ARCH_FAM)/$(TARGET_ARCH)
+EXTRA_INC += $(TARGET_ARCH_FAM)/$(XEN_TARGET_ARCH)
 EXTRA_SRC += arch/$(EXTRA_INC)
 endif
 
diff --git a/extras/mini-os/arch/x86/minios-x86_32.lds b/extras/mini-os/arch/x86/minios-x86_32.lds
index 08ebe14328..df5301944f 100644
--- a/extras/mini-os/arch/x86/minios-x86_32.lds
+++ b/extras/mini-os/arch/x86/minios-x86_32.lds
@@ -16,6 +16,18 @@ SECTIONS
   . = ALIGN(4096);
   _erodata = .;
 
+  /* newlib initialization functions */
+  . = ALIGN(32 / 8);
+  PROVIDE (__preinit_array_start = .);
+  .preinit_array     : { *(.preinit_array) }
+  PROVIDE (__preinit_array_end = .);
+  PROVIDE (__init_array_start = .);
+  .init_array     : { *(.init_array) }
+  PROVIDE (__init_array_end = .);
+  PROVIDE (__fini_array_start = .);
+  .fini_array     : { *(.fini_array) }
+  PROVIDE (__fini_array_end = .);
+
   .data : {			/* Data */
 	*(.data)
 	CONSTRUCTORS
diff --git a/extras/mini-os/arch/x86/minios-x86_64.lds b/extras/mini-os/arch/x86/minios-x86_64.lds
index 345c38640c..f93800236b 100644
--- a/extras/mini-os/arch/x86/minios-x86_64.lds
+++ b/extras/mini-os/arch/x86/minios-x86_64.lds
@@ -16,6 +16,18 @@ SECTIONS
   . = ALIGN(4096);
   _erodata = .;
 
+  /* newlib initialization functions */
+  . = ALIGN(64 / 8);
+  PROVIDE (__preinit_array_start = .);
+  .preinit_array     : { *(.preinit_array) }
+  PROVIDE (__preinit_array_end = .);
+  PROVIDE (__init_array_start = .);
+  .init_array     : { *(.init_array) }
+  PROVIDE (__init_array_end = .);
+  PROVIDE (__fini_array_start = .);
+  .fini_array     : { *(.fini_array) }
+  PROVIDE (__fini_array_end = .);
+
   .data : {			/* Data */
 	*(.data)
 	CONSTRUCTORS
diff --git a/extras/mini-os/arch/x86/mm.c b/extras/mini-os/arch/x86/mm.c
index 082527d098..dd556e4741 100644
--- a/extras/mini-os/arch/x86/mm.c
+++ b/extras/mini-os/arch/x86/mm.c
@@ -448,6 +448,15 @@ static unsigned long demand_map_area_start;
 #define DEMAND_MAP_PAGES ((2ULL << 30) / PAGE_SIZE)
 #endif
 
+#ifdef HAVE_LIBC
+unsigned long heap, brk, heap_mapped, heap_end;
+#ifdef __x86_64__
+#define HEAP_PAGES ((128ULL << 30) / PAGE_SIZE)
+#else
+#define HEAP_PAGES ((1ULL << 30) / PAGE_SIZE)
+#endif
+#endif
+
 void arch_init_demand_mapping_area(unsigned long cur_pfn)
 {
     cur_pfn++;
@@ -455,6 +464,14 @@ void arch_init_demand_mapping_area(unsigned long cur_pfn)
     demand_map_area_start = (unsigned long) pfn_to_virt(cur_pfn);
     cur_pfn += DEMAND_MAP_PAGES;
     printk("Demand map pfns at %lx-%lx.\n", demand_map_area_start, pfn_to_virt(cur_pfn));
+
+#ifdef HAVE_LIBC
+    cur_pfn++;
+    heap_mapped = brk = heap = (unsigned long) pfn_to_virt(cur_pfn);
+    cur_pfn += HEAP_PAGES;
+    heap_end = (unsigned long) pfn_to_virt(cur_pfn);
+    printk("Heap resides at %lx-%lx.\n", brk, heap_end);
+#endif
 }
 
 #define MAP_BATCH ((STACK_SIZE / 2) / sizeof(mmu_update_t))
diff --git a/extras/mini-os/arch/x86/x86_32.S b/extras/mini-os/arch/x86/x86_32.S
index 4b9a337c08..7f01851f0c 100644
--- a/extras/mini-os/arch/x86/x86_32.S
+++ b/extras/mini-os/arch/x86/x86_32.S
@@ -1,5 +1,5 @@
 #include <os.h>
-#include <arch_mm.h>
+#include <arch_limits.h>
 #include <xen/arch-x86_32.h>
 
 .section __xen_guest
@@ -22,12 +22,12 @@
 _start:
         cld
         lss stack_start,%esp
-        andl $(~(STACK_SIZE-1)), %esp
+        andl $(~(__STACK_SIZE-1)), %esp
         push %esi 
         call start_kernel
 
 stack_start:
-	.long stack+(2*STACK_SIZE), __KERNEL_SS
+	.long stack+(2*__STACK_SIZE), __KERNEL_SS
 
         /* Unpleasant -- the PTE that maps this page is actually overwritten */
         /* to map the real shared-info page! :-)                             */
diff --git a/extras/mini-os/arch/x86/x86_64.S b/extras/mini-os/arch/x86/x86_64.S
index fae2ae4cf5..c7a797db90 100644
--- a/extras/mini-os/arch/x86/x86_64.S
+++ b/extras/mini-os/arch/x86/x86_64.S
@@ -1,5 +1,5 @@
 #include <os.h>
-#include <arch_mm.h>
+#include <arch_limits.h>
 #include <xen/features.h>
 
 .section __xen_guest
@@ -19,12 +19,12 @@
 _start:
         cld
         movq stack_start(%rip),%rsp
-        andq $(~(STACK_SIZE-1)), %rsp
+        andq $(~(__STACK_SIZE-1)), %rsp
         movq %rsi,%rdi
         call start_kernel
 
 stack_start:
-        .quad stack+(2*STACK_SIZE)
+        .quad stack+(2*__STACK_SIZE)
 
         /* Unpleasant -- the PTE that maps this page is actually overwritten */
         /* to map the real shared-info page! :-)                             */