Re: [PATCH] Enable AT_PLATFORM for Loongson 2F CPU

[Robert Millan <rmh@gnu.org>]

[-- Attachment #1: Type: text/plain, Size: 469 bytes --]

El 11/11/10 15:47:35, en/na Robert Millan va escriure:
> -		__cpu_name[cpu] = "ICT Loongson-2";
> +		switch (c->processor_id & PRID_REV_MASK) {
> +		case PRID_REV_LOONGSON2E:
> +			__cpu_name[cpu] = "ICT Loongson-2E";

Actually, the V0.2 / V0.3 that follows in cpuinfo output
already indicates revision.  And I noticed that appending
the 'E' or 'F' breaks GCC's -march=native option (which
works by parsing /proc/cpuinfo).

Please use this patch instead.


[-- Attachment #2: loongson2f.diff --]
[-- Type: text/x-patch, Size: 1861 bytes --]


Signed-off-by: Robert Millan <rmh@gnu.org>

diff --git a/arch/mips/include/asm/elf.h b/arch/mips/include/asm/elf.h
index fd1d39e..58844f6 100644
--- a/arch/mips/include/asm/elf.h
+++ b/arch/mips/include/asm/elf.h
@@ -344,6 +344,12 @@ extern int dump_task_fpu(struct task_struct *, elf_fpregset_t *);
 #define ELF_PLATFORM  __elf_platform
 extern const char *__elf_platform;
 
+static inline void set_elf_platform(int cpu, const char *plat)
+{
+	if (cpu == 0)
+		__elf_platform = plat;
+}
+
 /*
  * See comments in asm-alpha/elf.h, this is the same thing
  * on the MIPS.
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 71620e1..accde65 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -614,6 +614,14 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
 	case PRID_IMP_LOONGSON2:
 		c->cputype = CPU_LOONGSON2;
 		__cpu_name[cpu] = "ICT Loongson-2";
+		switch (c->processor_id & PRID_REV_MASK) {
+		case PRID_REV_LOONGSON2E:
+			set_elf_platform(cpu, "loongson2e");
+			break;
+		case PRID_REV_LOONGSON2F:
+			set_elf_platform(cpu, "loongson2f");
+			break;
+		}
 		c->isa_level = MIPS_CPU_ISA_III;
 		c->options = R4K_OPTS |
 			     MIPS_CPU_FPU | MIPS_CPU_LLSC |
@@ -957,14 +965,12 @@ static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
 		c->cputype = CPU_CAVIUM_OCTEON_PLUS;
 		__cpu_name[cpu] = "Cavium Octeon+";
 platform:
-		if (cpu == 0)
-			__elf_platform = "octeon";
+		set_elf_platform(cpu, "octeon");
 		break;
 	case PRID_IMP_CAVIUM_CN63XX:
 		c->cputype = CPU_CAVIUM_OCTEON2;
 		__cpu_name[cpu] = "Cavium Octeon II";
-		if (cpu == 0)
-			__elf_platform = "octeon2";
+		set_elf_platform(cpu, "octeon2");
 		break;
 	default:
 		printk(KERN_INFO "Unknown Octeon chip!\n");