Guenter Roeck wrote:
[...]
+static inline void cpu_set_vmbits(struct cpuinfo_mips *c)
+{
+ if (cpu_has_64bits) {
+ unsigned long zbits;
+
+ asm volatile(".set mips64\n"
+ "and %0, 0\n"
+ "dsubu %0, 1\n"
+ "dmtc0 %0, $10, 0\n"
+ "dmfc0 %0, $10, 0\n"
+ "dsll %0, %0, 2\n"
+ "dsra %0, %0, 2\n"
+ "dclz %0, %0\n"
+ ".set mips0\n"
+ : "=r" (zbits));
+ c->vmbits = 64 - zbits;
+ } else
+ c->vmbits = 32;
+}
+
It should be possible to express this in 'pure' C using
read_c0_entryhi()/write_c0_entryhi(), also you need to be sure you are
not writing 1s to any reserved bits of the register.
David Daney
