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alpha-linux-user: Work around hosted mmap allocation problems

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Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2012-05-31 16:09:39 -07:00
parent d0f204952a
commit 76393642ae
1 changed files with 13 additions and 2 deletions
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11
target-alpha/cpu.h
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@ -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 {