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@@ -40,9 +40,20 @@
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#define TARGET_PAGE_BITS 13
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+#ifdef CONFIG_USER_ONLY
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+/* ??? The kernel likes to give addresses in high memory. If the host has
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+ more virtual address space than the guest, this can lead to impossible
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+ allocations. Honor the long-standing assumption that only kernel addrs
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+ are negative, but otherwise allow allocations anywhere. This could lead
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+ to tricky emulation problems for programs doing tagged addressing, but
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+ that's far fewer than encounter the impossible allocation problem. */
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+#define TARGET_PHYS_ADDR_SPACE_BITS 63
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+#define TARGET_VIRT_ADDR_SPACE_BITS 63
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+#else
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/* ??? EV4 has 34 phys addr bits, EV5 has 40, EV6 has 44. */
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-#define TARGET_PHYS_ADDR_SPACE_BITS 44
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-#define TARGET_VIRT_ADDR_SPACE_BITS (30 + TARGET_PAGE_BITS)
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+#define TARGET_PHYS_ADDR_SPACE_BITS 44
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+#define TARGET_VIRT_ADDR_SPACE_BITS (30 + TARGET_PAGE_BITS)
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+#endif
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/* Alpha major type */
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enum {
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Richard Henderson