Merge branches 'ns9x' and 'machtypes' into devel

[linux-2.6-omap-h63xx.git] / arch / arm / kernel / setup.c

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 650eac1bc0a6f2b5d3e10d382012c8e4850f56f0..b7b0720bc1bbe8295ea3ca7b2849e4a5ad875bf2 100644 (file)
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -23,6 +23,7 @@
 #include <linux/cpu.h>
 #include <linux/interrupt.h>
 #include <linux/smp.h>
+#include <linux/fs.h>
 
 #include <asm/cpu.h>
 #include <asm/elf.h>
@@ -37,6 +38,7 @@
 #include <asm/mach/time.h>
 
 #include "compat.h"
+#include "atags.h"
 
 #ifndef MEM_SIZE
 #define MEM_SIZE       (16*1024*1024)
@@ -60,9 +62,12 @@ extern int root_mountflags;
 extern void _stext, _text, _etext, __data_start, _edata, _end;
 
 unsigned int processor_id;
+EXPORT_SYMBOL(processor_id);
 unsigned int __machine_arch_type;
 EXPORT_SYMBOL(__machine_arch_type);
 
+unsigned int __atags_pointer __initdata;
+
 unsigned int system_rev;
 EXPORT_SYMBOL(system_rev);
 
@@ -301,10 +306,23 @@ int cpu_architecture(void)
                cpu_arch = (processor_id >> 16) & 7;
                if (cpu_arch)
                        cpu_arch += CPU_ARCH_ARMv3;
-       } else {
-               /* the revised CPUID */
-               cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6;
-       }
+       } else if ((processor_id & 0x000f0000) == 0x000f0000) {
+               unsigned int mmfr0;
+
+               /* Revised CPUID format. Read the Memory Model Feature
+                * Register 0 and check for VMSAv7 or PMSAv7 */
+               asm("mrc        p15, 0, %0, c0, c1, 4"
+                   : "=r" (mmfr0));
+               if ((mmfr0 & 0x0000000f) == 0x00000003 ||
+                   (mmfr0 & 0x000000f0) == 0x00000030)
+                       cpu_arch = CPU_ARCH_ARMv7;
+               else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
+                        (mmfr0 & 0x000000f0) == 0x00000020)
+                       cpu_arch = CPU_ARCH_ARMv6;
+               else
+                       cpu_arch = CPU_ARCH_UNKNOWN;
+       } else
+               cpu_arch = CPU_ARCH_UNKNOWN;
 
        return cpu_arch;
 }
@@ -780,7 +798,9 @@ void __init setup_arch(char **cmdline_p)
        if (mdesc->soft_reboot)
                reboot_setup("s");
 
-       if (mdesc->boot_params)
+       if (__atags_pointer)
+               tags = phys_to_virt(__atags_pointer);
+       else if (mdesc->boot_params)
                tags = phys_to_virt(mdesc->boot_params);
 
        /*
@@ -798,6 +818,7 @@ void __init setup_arch(char **cmdline_p)
        if (tags->hdr.tag == ATAG_CORE) {
                if (meminfo.nr_banks != 0)
                        squash_mem_tags(tags);
+               save_atags(tags);
                parse_tags(tags);
        }
 
@@ -980,7 +1001,7 @@ static void c_stop(struct seq_file *m, void *v)
 {
 }
 
-struct seq_operations cpuinfo_op = {
+const struct seq_operations cpuinfo_op = {
        .start  = c_start,
        .next   = c_next,
        .stop   = c_stop,