[Xen-devel] [PATCH v4 4/9] tools: arm: rearrange guest physical address space to increase max RAM

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

By switching things around we can manage to expose up to 3GB of RAM to guests.

I deliberately didn't place the RAM at address 0 to avoid coming to rely on
this, so the various peripherals, MMIO and magic pages etc all live in the
lower 1GB leaving the upper 3GB available for RAM.

It would likely have been possible to reduce the space used by the peripherals
etc and allow for 3.5 or 3.75GB but I decided to keep things simple and will
handle >3GB memory in a subsequent patch.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 xen/include/public/arch-arm.h |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/xen/include/public/arch-arm.h b/xen/include/public/arch-arm.h
index 6630f36..d5090fb 100644
--- a/xen/include/public/arch-arm.h
+++ b/xen/include/public/arch-arm.h
@@ -364,20 +364,20 @@ typedef uint64_t xen_callback_t;
  */
 
 /* Physical Address Space */
-#define GUEST_GICD_BASE   0x2c001000ULL
-#define GUEST_GICD_SIZE   0x1000ULL
-#define GUEST_GICC_BASE   0x2c002000ULL
-#define GUEST_GICC_SIZE   0x100ULL
+#define GUEST_GICD_BASE   0x03001000ULL
+#define GUEST_GICD_SIZE   0x00001000ULL
+#define GUEST_GICC_BASE   0x03002000ULL
+#define GUEST_GICC_SIZE   0x00000100ULL
 
-#define GUEST_RAM_BASE    0x80000000ULL /* 768M @ 2GB */
-#define GUEST_RAM_SIZE    0x30000000ULL
-
-#define GUEST_GNTTAB_BASE 0xb0000000ULL
+#define GUEST_GNTTAB_BASE 0x38000000ULL
 #define GUEST_GNTTAB_SIZE 0x00020000ULL
 
-#define GUEST_MAGIC_BASE  0xc0000000ULL
+#define GUEST_MAGIC_BASE  0x39000000ULL
 #define GUEST_MAGIC_SIZE  0x01000000ULL
 
+#define GUEST_RAM_BASE    0x40000000ULL /* 3GB of RAM @ 1GB */
+#define GUEST_RAM_SIZE    0xc0000000ULL
+
 /* Interrupts */
 #define GUEST_TIMER_VIRT_PPI    27
 #define GUEST_TIMER_PHYS_S_PPI  29
-- 
1.7.10.4


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