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[02/10] alpha-linux-user: Work around hosted mmap allocation problems

Message ID 1343254238-4727-3-git-send-email-rth@twiddle.net
State New
Headers show

Commit Message

Richard Henderson July 25, 2012, 10:10 p.m. UTC 
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 target-alpha/cpu.h |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)
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Patch

diff --git a/target-alpha/cpu.h b/target-alpha/cpu.h
index 99f9ee1..0d87fa7 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)
+#endif
 
 /* Alpha major type */
 enum {