[SPARC64]: Detect sun4v early in boot process.

We look for "SUNW,sun4v" in the 'compatible' property
of the root OBP device tree node.

Protect every %ver register access, to make sure it is
not touched on sun4v, as %ver is hyperprivileged there.

Lock kernel TLB entries using hypervisor calls instead of
calls into OBP.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/cpu.c b/arch/sparc64/kernel/cpu.c
index 00eed88ef2e8..c7a4fb397024 100644
--- a/arch/sparc64/kernel/cpu.c
+++ b/arch/sparc64/kernel/cpu.c
@@ -71,6 +71,12 @@ void __init cpu_probe(void)
         unsigned long ver, fpu_vers, manuf, impl, fprs;
         int i;
         
+        if (tlb_type == hypervisor) {
+                sparc_cpu_type = "UltraSparc T1 (Niagara)";
+                sparc_fpu_type = "UltraSparc T1 integrated FPU";
+                return;
+        }
+
         fprs = fprs_read();
         fprs_write(FPRS_FEF);
         __asm__ __volatile__ ("rdpr %%ver, %0; stx %%fsr, [%1]"