powerpc/mp: add support for discontiguous cores

Some SOCs have discontiguously-numbered cores, and so we can't determine the
valid core numbers via the FRR register any more.  We define
CPU_TYPE_ENTRY_MASK to specify a discontiguous core mask, and helper functions
to process the mask and enumerate over the set of valid cores.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 0c4cc25..50af6e7 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -1176,13 +1176,17 @@ struct cpu_type {
 	char name[15];
 	u32 soc_ver;
 	u32 num_cores;
+	u32 mask;	/* which cpu(s) actually exist */
 };
 
 struct cpu_type *identify_cpu(u32 ver);
 
 #if defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx)
 #define CPU_TYPE_ENTRY(n, v, nc) \
-	{ .name = #n, .soc_ver = SVR_##v, .num_cores = (nc), }
+	{ .name = #n, .soc_ver = SVR_##v, .num_cores = (nc), \
+	  .mask = (1 << (nc)) - 1 }
+#define CPU_TYPE_ENTRY_MASK(n, v, nc, m) \
+	{ .name = #n, .soc_ver = SVR_##v, .num_cores = (nc), .mask = (m) }
 #else
 #if defined(CONFIG_MPC83xx)
 #define CPU_TYPE_ENTRY(x) {#x, SPR_##x}