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sh: Expose physical addressing mode through cpuinfo.

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CPUs can be in either the legacy 29-bit or 32-bit physical addressing
modes. This follows the x86 approach of tracking the phys bits in cpuinfo
and exposing it to userspace through procfs.

This change was requested to permit kexec-tools to detect the physical
addressing mode in order to determine the appropriate address mangling.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-10-26 14:44:58 +09:00
parent b18cae4224
commit 2f98492c53
3 changed files with 6 additions and 0 deletions
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1
arch/sh/include/asm/processor.h
View File

@ -89,6 +89,7 @@ struct sh_cpuinfo {
struct task_struct *idle;
#endif
unsigned int phys_bits;
unsigned long flags;
} __attribute__ ((aligned(L1_CACHE_BYTES)));

2
arch/sh/kernel/cpu/init.c
View File

@ -340,6 +340,8 @@ asmlinkage void __cpuinit cpu_init(void)
*/
current_cpu_data.asid_cache = NO_CONTEXT;
current_cpu_data.phys_bits = __in_29bit_mode() ? 29 : 32;
speculative_execution_init();
expmask_init();

3
arch/sh/kernel/setup.c
View File

@ -52,6 +52,7 @@ struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
.type = CPU_SH_NONE,
.family = CPU_FAMILY_UNKNOWN,
.loops_per_jiffy = 10000000,
.phys_bits = MAX_PHYSMEM_BITS,
},
};
EXPORT_SYMBOL(cpu_data);
@ -432,6 +433,8 @@ static int show_cpuinfo(struct seq_file *m, void *v)
if (c->flags & CPU_HAS_L2_CACHE)
show_cacheinfo(m, "scache", c->scache);
seq_printf(m, "address sizes\t: %u bits physical\n", c->phys_bits);
seq_printf(m, "bogomips\t: %lu.%02lu\n",
c->loops_per_jiffy/(500000/HZ),
(c->loops_per_jiffy/(5000/HZ)) % 100);