linuxkpi: Define cpu_data(cpu)

`cpu_data(cpu)` evaluates to a `struct cpuinfo_x86` filled with
attributes of the given CPU number. The CPU number is an index in the
`__cpu_data[]` array with MAXCPU entries. On FreeBSD, we simply
initialize all of them like we do with `boot_cpu_data`.

While here, we add the `x86_model` field to the `struct cpuinfo_x86`. We
use `CPUID_TO_MODEL()` to set it.

At the same time, we fix the value of `x86` which should have been set
to the CPU family. It was using the same implementation as
`CPUID_TO_MODEL()` before. It now uses `CPUID_TO_FAMILY()`.

Reviewed by:	manu
Approved by:	manu
Differential Revision:	https://reviews.freebsd.org/D38542

sys/compat/linuxkpi/common/include/asm/intel-family.h

@@ -0,0 +1,3 @@
+/* Public domain. */
+
+#define	INTEL_FAM6_ROCKETLAKE	0xA7

sys/compat/linuxkpi/common/include/asm/processor.h

@@ -35,11 +35,14 @@
 #if defined(__i386__) || defined(__amd64__)
 struct cpuinfo_x86 {
 	uint8_t		x86;
+	uint8_t		x86_model;
 	uint16_t	x86_clflush_size;
 	uint16_t	x86_max_cores;
 };
 
 extern struct cpuinfo_x86	boot_cpu_data;
+extern struct cpuinfo_x86	__cpu_data[];
+#define	cpu_data(cpu)	__cpu_data[cpu]
 #endif
 
 #define	cpu_relax()	cpu_spinwait()

sys/compat/linuxkpi/common/src/linux_compat.c

@@ -2745,6 +2745,7 @@ io_mapping_create_wc(resource_size_t base, unsigned long size)
 #if defined(__i386__) || defined(__amd64__)
 bool linux_cpu_has_clflush;
 struct cpuinfo_x86 boot_cpu_data;
+struct cpuinfo_x86 __cpu_data[MAXCPU];
 #endif
 
 cpumask_t *
@@ -2767,7 +2768,15 @@ linux_compat_init(void *arg)
 	linux_cpu_has_clflush = (cpu_feature & CPUID_CLFSH);
 	boot_cpu_data.x86_clflush_size = cpu_clflush_line_size;
 	boot_cpu_data.x86_max_cores = mp_ncpus;
-	boot_cpu_data.x86 = ((cpu_id & 0xf0000) >> 12) | ((cpu_id & 0xf0) >> 4);
+	boot_cpu_data.x86 = CPUID_TO_FAMILY(cpu_id);
+	boot_cpu_data.x86_model = CPUID_TO_MODEL(cpu_id);
+
+	for (i = 0; i < MAXCPU; i++) {
+		__cpu_data[i].x86_clflush_size = cpu_clflush_line_size;
+		__cpu_data[i].x86_max_cores = mp_ncpus;
+		__cpu_data[i].x86 = CPUID_TO_FAMILY(cpu_id);
+		__cpu_data[i].x86_model = CPUID_TO_MODEL(cpu_id);
+	}
 #endif
 	rw_init(&linux_vma_lock, "lkpi-vma-lock");