MIPS: 64-bit: Detect virtual memory size

[safe/jmp/linux-2.6] / arch / mips / kernel / cpu-probe.c

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 80e202e..9c187a6 100644 (file)
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -284,6 +284,15 @@ static inline int __cpu_has_fpu(void)
        return ((cpu_get_fpu_id() & 0xff00) != FPIR_IMP_NONE);
 }
 
+static inline void cpu_probe_vmbits(struct cpuinfo_mips *c)
+{
+#ifdef __NEED_VMBITS_PROBE
+       write_c0_entryhi(0x3ffffffffffff000ULL);
+       back_to_back_c0_hazard();
+       c->vmbits = fls64(read_c0_entryhi() & 0x3ffffffffffff000ULL);
+#endif
+}
+
 #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
                | MIPS_CPU_COUNTER)
 
@@ -969,6 +978,8 @@ __cpuinit void cpu_probe(void)
                c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
        else
                c->srsets = 1;
+
+       cpu_probe_vmbits(c);
 }
 
 __cpuinit void cpu_report(void)