MIPS: math-emu: Set FIR feature flags for full emulation

Implement FIR feature flags in the FPU emulator according to features
supported and architecture level requirements.  The W, L and F64 bits
have only been added at level #2 even though the features they refer to
were also included with the MIPS64r1 ISA and the W fixed-point format
also with the MIPS32r1 ISA.

This is only relevant for the full emulation mode and the emulated CFC1
instruction as well as ptrace(2) accesses.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9707/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 23 insertions, 2 deletions

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index f8481ce7bbb1..ca9b9c62c6ea 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -20,6 +20,7 @@
 
 #include <asm/bugs.h>
 #include <asm/cpu.h>
+#include <asm/cpu-features.h>
 #include <asm/cpu-type.h>
 #include <asm/fpu.h>
 #include <asm/mipsregs.h>
@@ -31,11 +32,30 @@
 #include <asm/spram.h>
 #include <asm/uaccess.h>
 
+/*
+ * Set the FIR feature flags for the FPU emulator.
+ */
+static void cpu_set_nofpu_id(struct cpuinfo_mips *c)
+{
+        u32 value;
+
+        value = 0;
+        if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 |
+                            MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 |
+                            MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6))
+                value |= MIPS_FPIR_D | MIPS_FPIR_S;
+        if (c->isa_level & (MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 |
+                            MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6))
+                value |= MIPS_FPIR_F64 | MIPS_FPIR_L | MIPS_FPIR_W;
+        c->fpu_id = value;
+}
+
 static int mips_fpu_disabled;
 
 static int __init fpu_disable(char *s)
 {
-        cpu_data[0].options &= ~MIPS_CPU_FPU;
+        boot_cpu_data.options &= ~MIPS_CPU_FPU;
+        cpu_set_nofpu_id(&boot_cpu_data);
         mips_fpu_disabled = 1;
 
         return 1;
@@ -1382,7 +1402,8 @@ void cpu_probe(void)
                         if (c->fpu_id & MIPS_FPIR_FREP)
                                 c->options |= MIPS_CPU_FRE;
                 }
-        }
+        } else
+                cpu_set_nofpu_id(c);
 
         if (cpu_has_mips_r2_r6) {
                 c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;