[Xen-devel] [RFC PATCH v2] xen: arm: move rambase definitions to Rules.mk

[Andrii Tseglytskyi <andrii.tseglytskyi@xxxxxxxxxxxxxxx>]

The reason of this pathch is the following - guest domain OS may
use iomem mappings. It is a typical way to handle devices in domU.
On some SoCs iomem starts from 0x40000000 base. Therefore it is
almost impossible to use iomem mappings, because it conflicts with
GUEST_RAM0_BASE pointer, which has similar value. Patch allows
to configure this from compile command line.

Verified on OMAP5 with the following settings:
GUEST_CFG_RAM_BASE=0x80000000ULL GUEST_CFG_RAM_SIZE=0x80000000ULL

Changes in v2:
- GUEST_RAM0_BASE and GUEST_RAM0_SIZE definitions kept in public header

Signed-off-by: Andrii Tseglytskyi <andrii.tseglytskyi@xxxxxxxxxxxxxxx>
---
 tools/Rules.mk                | 9 +++++++++
 xen/arch/arm/Rules.mk         | 5 +++++
 xen/include/public/arch-arm.h | 4 ++--
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/tools/Rules.mk b/tools/Rules.mk
index 5bac700..4cf3603 100644
--- a/tools/Rules.mk
+++ b/tools/Rules.mk
@@ -35,6 +35,15 @@ INSTALL_SHLIB = : install-shlib-unsupported-fail
 SYMLINK_SHLIB = : symlink-shlib-unsupported-fail
 endif
 
+TOOLS_TARGET_ARCH := $(shell echo $(XEN_TARGET_ARCH) | \
+                 sed -e 's/x86.*/x86/' -e s'/arm\(32\|64\)/arm/g')
+ifeq ($(TOOLS_TARGET_ARCH),arm)
+GUEST_CFG_RAM_BASE ?= 0x40000000ULL
+GUEST_CFG_RAM_SIZE ?= 0xc0000000ULL
+CFLAGS += -DGUEST_CFG_RAM_BASE=$(GUEST_CFG_RAM_BASE)
+CFLAGS += -DGUEST_CFG_RAM_SIZE=$(GUEST_CFG_RAM_SIZE)
+endif
+
 CFLAGS_libxenctrl = -I$(XEN_LIBXC) $(CFLAGS_xeninclude)
 LDLIBS_libxenctrl = $(XEN_LIBXC)/libxenctrl$(libextension)
 SHLIB_libxenctrl  = -Wl,-rpath-link=$(XEN_LIBXC)
diff --git a/xen/arch/arm/Rules.mk b/xen/arch/arm/Rules.mk
index 8658176..f590f0a 100644
--- a/xen/arch/arm/Rules.mk
+++ b/xen/arch/arm/Rules.mk
@@ -104,6 +104,11 @@ ifneq ($(EARLY_PRINTK_INC),)
 EARLY_PRINTK := y
 endif
 
+GUEST_CFG_RAM_BASE ?= 0x40000000ULL
+GUEST_CFG_RAM_SIZE ?= 0xc0000000ULL
+CFLAGS += -DGUEST_CFG_RAM_BASE=$(GUEST_CFG_RAM_BASE)
+CFLAGS += -DGUEST_CFG_RAM_SIZE=$(GUEST_CFG_RAM_SIZE)
+
 CFLAGS-$(EARLY_PRINTK) += -DCONFIG_EARLY_PRINTK
 CFLAGS-$(EARLY_PRINTK_INIT_UART) += -DEARLY_PRINTK_INIT_UART
 CFLAGS-$(EARLY_PRINTK) += -DEARLY_PRINTK_INC=\"debug-$(EARLY_PRINTK_INC).inc\"
diff --git a/xen/include/public/arch-arm.h b/xen/include/public/arch-arm.h
index ac54cd6..079da2a 100644
--- a/xen/include/public/arch-arm.h
+++ b/xen/include/public/arch-arm.h
@@ -380,8 +380,8 @@ typedef uint64_t xen_callback_t;
 
 #define GUEST_RAM_BANKS   2
 
-#define GUEST_RAM0_BASE   0x40000000ULL /* 3GB of low RAM @ 1GB */
-#define GUEST_RAM0_SIZE   0xc0000000ULL
+#define GUEST_RAM0_BASE   GUEST_CFG_RAM_BASE /* configured from command line */
+#define GUEST_RAM0_SIZE   GUEST_CFG_RAM_SIZE
 
 #define GUEST_RAM1_BASE   0x0200000000ULL /* 1016GB of RAM @ 8GB */
 #define GUEST_RAM1_SIZE   0xfe00000000ULL
-- 
1.9.1


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