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authorRichard Henderson <rth@twiddle.net>2012-05-31 16:09:39 -0700
committerRichard Henderson <rth@twiddle.net>2012-08-04 09:37:48 -0700
commit76393642ae65a613bc8232379b4cd347fe69e08a (patch)
treee6b3572a9be8e4cc660f4d38ce2f18c741f8bc4c /target-alpha/cpu.h
parentd0f204952a02a69bc853a1c274b2a5ee4acfd39f (diff)
downloadqemu-arm-76393642ae65a613bc8232379b4cd347fe69e08a.tar.gz
alpha-linux-user: Work around hosted mmap allocation problems
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'target-alpha/cpu.h')
-rw-r--r--target-alpha/cpu.h15
1 files changed, 13 insertions, 2 deletions
diff --git a/target-alpha/cpu.h b/target-alpha/cpu.h
index 99f9ee168d..5689760cef 100644
--- a/target-alpha/cpu.h
+++ b/target-alpha/cpu.h
@@ -40,9 +40,20 @@
#define TARGET_PAGE_BITS 13
+#ifdef CONFIG_USER_ONLY
+/* ??? The kernel likes to give addresses in high memory. If the host has
+ more virtual address space than the guest, this can lead to impossible
+ allocations. Honor the long-standing assumption that only kernel addrs
+ are negative, but otherwise allow allocations anywhere. This could lead
+ to tricky emulation problems for programs doing tagged addressing, but
+ that's far fewer than encounter the impossible allocation problem. */
+#define TARGET_PHYS_ADDR_SPACE_BITS 63
+#define TARGET_VIRT_ADDR_SPACE_BITS 63
+#else
/* ??? EV4 has 34 phys addr bits, EV5 has 40, EV6 has 44. */
-#define TARGET_PHYS_ADDR_SPACE_BITS 44
-#define TARGET_VIRT_ADDR_SPACE_BITS (30 + TARGET_PAGE_BITS)
+#define TARGET_PHYS_ADDR_SPACE_BITS 44
+#define TARGET_VIRT_ADDR_SPACE_BITS (30 + TARGET_PAGE_BITS)
+#endif
/* Alpha major type */
enum {