diff --git a/exec.c b/exec.c
index 0940137..d011cce 100644
--- a/exec.c
+++ b/exec.c
@@ -74,6 +74,10 @@
 #define TARGET_VIRT_ADDR_SPACE_BITS 42
 #elif defined(TARGET_PPC64)
 #define TARGET_PHYS_ADDR_SPACE_BITS 42
+#elif defined(TARGET_X86_64) && !defined(USE_KQEMU)
+#define TARGET_PHYS_ADDR_SPACE_BITS 42
+#elif defined(TARGET_I386) && !defined(USE_KQEMU)
+#define TARGET_PHYS_ADDR_SPACE_BITS 36
 #else
 /* Note: for compatibility with kqemu, we use 32 bits for x86_64 */
 #define TARGET_PHYS_ADDR_SPACE_BITS 32
@@ -88,7 +92,7 @@
 uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE] __attribute__((aligned (32)));
 uint8_t *code_gen_ptr;
 
-int phys_ram_size;
+ram_addr_t phys_ram_size;
 int phys_ram_fd;
 uint8_t *phys_ram_base;
 uint8_t *phys_ram_dirty;
@@ -113,7 +117,7 @@
 
 typedef struct PhysPageDesc {
     /* offset in host memory of the page + io_index in the low 12 bits */
-    uint32_t phys_offset;
+    ram_addr_t phys_offset;
 } PhysPageDesc;
 
 #define L2_BITS 10
@@ -234,7 +238,7 @@
 #endif
 }
 
-static inline PageDesc *page_find_alloc(unsigned int index)
+static inline PageDesc *page_find_alloc(target_ulong index)
 {
     PageDesc **lp, *p;
 
@@ -249,7 +253,7 @@
     return p + (index & (L2_SIZE - 1));
 }
 
-static inline PageDesc *page_find(unsigned int index)
+static inline PageDesc *page_find(target_ulong index)
 {
     PageDesc *p;
 
@@ -511,12 +515,12 @@
     tb_set_jmp_target(tb, n, (unsigned long)(tb->tc_ptr + tb->tb_next_offset[n]));
 }
 
-static inline void tb_phys_invalidate(TranslationBlock *tb, unsigned int page_addr)
+static inline void tb_phys_invalidate(TranslationBlock *tb, target_ulong page_addr)
 {
     CPUState *env;
     PageDesc *p;
     unsigned int h, n1;
-    target_ulong phys_pc;
+    target_phys_addr_t phys_pc;
     TranslationBlock *tb1, *tb2;
 
     /* remove the TB from the hash list */
@@ -667,7 +671,7 @@
    the same physical page. 'is_cpu_write_access' should be true if called
    from a real cpu write access: the virtual CPU will exit the current
    TB if code is modified inside this TB. */
-void tb_invalidate_phys_page_range(target_ulong start, target_ulong end,
+void tb_invalidate_phys_page_range(target_phys_addr_t start, target_phys_addr_t end,
                                    int is_cpu_write_access)
 {
     int n, current_tb_modified, current_tb_not_found, current_flags;
@@ -780,7 +784,7 @@
 }
 
 /* len must be <= 8 and start must be a multiple of len */
-static inline void tb_invalidate_phys_page_fast(target_ulong start, int len)
+static inline void tb_invalidate_phys_page_fast(target_phys_addr_t start, int len)
 {
     PageDesc *p;
     int offset, b;
@@ -809,7 +813,7 @@
 }
 
 #if !defined(CONFIG_SOFTMMU)
-static void tb_invalidate_phys_page(target_ulong addr,
+static void tb_invalidate_phys_page(target_phys_addr_t addr,
                                     unsigned long pc, void *puc)
 {
     int n, current_flags, current_tb_modified;
@@ -1985,9 +1989,9 @@
 #endif /* defined(CONFIG_USER_ONLY) */
 
 static int subpage_register (subpage_t *mmio, uint32_t start, uint32_t end,
-                             int memory);
-static void *subpage_init (target_phys_addr_t base, uint32_t *phys,
-                           int orig_memory);
+                             ram_addr_t memory);
+static void *subpage_init (target_phys_addr_t base, ram_addr_t *phys,
+                           ram_addr_t orig_memory);
 #define CHECK_SUBPAGE(addr, start_addr, start_addr2, end_addr, end_addr2, \
                       need_subpage)                                     \
     do {                                                                \
@@ -2012,13 +2016,13 @@
    page size. If (phys_offset & ~TARGET_PAGE_MASK) != 0, then it is an
    io memory page */
 void cpu_register_physical_memory(target_phys_addr_t start_addr,
-                                  unsigned long size,
-                                  unsigned long phys_offset)
+                                  ram_addr_t size,
+                                  ram_addr_t phys_offset)
 {
     target_phys_addr_t addr, end_addr;
     PhysPageDesc *p;
     CPUState *env;
-    unsigned long orig_size = size;
+    ram_addr_t orig_size = size;
     void *subpage;
 
     size = (size + TARGET_PAGE_SIZE - 1) & TARGET_PAGE_MASK;
@@ -2026,7 +2030,7 @@
     for(addr = start_addr; addr != end_addr; addr += TARGET_PAGE_SIZE) {
         p = phys_page_find(addr >> TARGET_PAGE_BITS);
         if (p && p->phys_offset != IO_MEM_UNASSIGNED) {
-            unsigned long orig_memory = p->phys_offset;
+            ram_addr_t orig_memory = p->phys_offset;
             target_phys_addr_t start_addr2, end_addr2;
             int need_subpage = 0;
 
@@ -2079,7 +2083,7 @@
 }
 
 /* XXX: temporary until new memory mapping API */
-uint32_t cpu_get_physical_page_desc(target_phys_addr_t addr)
+ram_addr_t cpu_get_physical_page_desc(target_phys_addr_t addr)
 {
     PhysPageDesc *p;
 
@@ -2090,11 +2094,11 @@
 }
 
 /* XXX: better than nothing */
-ram_addr_t qemu_ram_alloc(unsigned int size)
+ram_addr_t qemu_ram_alloc(ram_addr_t size)
 {
     ram_addr_t addr;
     if ((phys_ram_alloc_offset + size) > phys_ram_size) {
-        fprintf(stderr, "Not enough memory (requested_size = %u, max memory = %d)\n",
+        fprintf(stderr, "Not enough memory (requested_size = %lu, max memory = %ld)\n",
                 size, phys_ram_size);
         abort();
     }
@@ -2408,7 +2412,7 @@
 };
 
 static int subpage_register (subpage_t *mmio, uint32_t start, uint32_t end,
-                             int memory)
+                             ram_addr_t memory)
 {
     int idx, eidx;
     unsigned int i;
@@ -2438,8 +2442,8 @@
     return 0;
 }
 
-static void *subpage_init (target_phys_addr_t base, uint32_t *phys,
-                           int orig_memory)
+static void *subpage_init (target_phys_addr_t base, ram_addr_t *phys,
+                           ram_addr_t orig_memory)
 {
     subpage_t *mmio;
     int subpage_memory;