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Diffstat (limited to 'arch/powerpc/cpu/mpc85xx/release.S')
-rw-r--r--arch/powerpc/cpu/mpc85xx/release.S35
1 files changed, 34 insertions, 1 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/release.S b/arch/powerpc/cpu/mpc85xx/release.S
index 4ba44a9028..1f76925dc1 100644
--- a/arch/powerpc/cpu/mpc85xx/release.S
+++ b/arch/powerpc/cpu/mpc85xx/release.S
@@ -351,6 +351,13 @@ __secondary_reset_vector:
.align L1_CACHE_SHIFT
.global __second_half_boot_page
__second_half_boot_page:
+#ifdef CONFIG_PPC_SPINTABLE_COMPATIBLE
+ lis r3,(spin_table_compat - __second_half_boot_page)@h
+ ori r3,r3,(spin_table_compat - __second_half_boot_page)@l
+ add r3,r3,r11 /* r11 has the address of __second_half_boot_page */
+ lwz r14,0(r3)
+#endif
+
#define EPAPR_MAGIC 0x45504150
#define ENTRY_ADDR_UPPER 0
#define ENTRY_ADDR_LOWER 4
@@ -383,7 +390,24 @@ __second_half_boot_page:
stw r8,ENTRY_ADDR_LOWER(r10)
/* spin waiting for addr */
-3: lwz r4,ENTRY_ADDR_LOWER(r10)
+3:
+/*
+ * To comply with ePAPR 1.1, the spin table has been moved to cache-enabled
+ * memory. Old OS may not work with this change. A patch is waiting to be
+ * accepted for Linux kernel. Other OS needs similar fix to spin table.
+ * For OSes with old spin table code, we can enable this temporary fix by
+ * setting environmental variable "spin_table_compat". For new OSes, set
+ * "spin_table_compat=no". After Linux is fixed, we can remove this macro
+ * and related code. For now, it is enabled by default.
+ */
+#ifdef CONFIG_PPC_SPINTABLE_COMPATIBLE
+ cmpwi r14,0
+ beq 4f
+ dcbf 0, r10
+ sync
+4:
+#endif
+ lwz r4,ENTRY_ADDR_LOWER(r10)
andi. r11,r4,1
bne 3b
isync
@@ -460,5 +484,14 @@ __second_half_boot_page:
.globl __spin_table
__spin_table:
.space CONFIG_MAX_CPUS*ENTRY_SIZE
+
+#ifdef CONFIG_PPC_SPINTABLE_COMPATIBLE
+ .align L1_CACHE_SHIFT
+ .global spin_table_compat
+spin_table_compat:
+ .long 1
+
+#endif
+
__spin_table_end:
.space 4096 - (__spin_table_end - __spin_table)