From 76393642ae65a613bc8232379b4cd347fe69e08a Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Thu, 31 May 2012 16:09:39 -0700 Subject: [PATCH] alpha-linux-user: Work around hosted mmap allocation problems Signed-off-by: Richard Henderson --- target-alpha/cpu.h | 15 +++++++++++++-- 1 file 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 { -- GitLab