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Diffstat (limited to 'arch/blackfin/mach-bf561/include/mach/mem_map.h')
-rw-r--r--arch/blackfin/mach-bf561/include/mach/mem_map.h80
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf561/include/mach/mem_map.h b/arch/blackfin/mach-bf561/include/mach/mem_map.h
index f1d4c0637bd2..419dffdc96eb 100644
--- a/arch/blackfin/mach-bf561/include/mach/mem_map.h
+++ b/arch/blackfin/mach-bf561/include/mach/mem_map.h
@@ -85,4 +85,84 @@
#define L1_SCRATCH_START COREA_L1_SCRATCH_START
#define L1_SCRATCH_LENGTH 0x1000
+#ifdef __ASSEMBLY__
+
+/*
+ * The following macros both return the address of the PDA for the
+ * current core.
+ *
+ * In its first safe (and hairy) form, the macro neither clobbers any
+ * register aside of the output Preg, nor uses the stack, since it
+ * could be called with an invalid stack pointer, or the current stack
+ * space being uncovered by any CPLB (e.g. early exception handling).
+ *
+ * The constraints on the second form are a bit relaxed, and the code
+ * is allowed to use the specified Dreg for determining the PDA
+ * address to be returned into Preg.
+ */
+#ifdef CONFIG_SMP
+#define GET_PDA_SAFE(preg) \
+ preg.l = lo(DSPID); \
+ preg.h = hi(DSPID); \
+ preg = [preg]; \
+ preg = preg << 2; \
+ preg = preg << 2; \
+ preg = preg << 2; \
+ preg = preg << 2; \
+ preg = preg << 2; \
+ preg = preg << 2; \
+ preg = preg << 2; \
+ preg = preg << 2; \
+ preg = preg << 2; \
+ preg = preg << 2; \
+ preg = preg << 2; \
+ preg = preg << 2; \
+ if cc jump 2f; \
+ cc = preg == 0x0; \
+ preg.l = _cpu_pda; \
+ preg.h = _cpu_pda; \
+ if !cc jump 3f; \
+1: \
+ /* preg = 0x0; */ \
+ cc = !cc; /* restore cc to 0 */ \
+ jump 4f; \
+2: \
+ cc = preg == 0x0; \
+ preg.l = _cpu_pda; \
+ preg.h = _cpu_pda; \
+ if cc jump 4f; \
+ /* preg = 0x1000000; */ \
+ cc = !cc; /* restore cc to 1 */ \
+3: \
+ preg = [preg]; \
+4:
+
+#define GET_PDA(preg, dreg) \
+ preg.l = lo(DSPID); \
+ preg.h = hi(DSPID); \
+ dreg = [preg]; \
+ preg.l = _cpu_pda; \
+ preg.h = _cpu_pda; \
+ cc = bittst(dreg, 0); \
+ if !cc jump 1f; \
+ preg = [preg]; \
+1: \
+
+#define GET_CPUID(preg, dreg) \
+ preg.l = lo(DSPID); \
+ preg.h = hi(DSPID); \
+ dreg = [preg]; \
+ dreg = ROT dreg BY -1; \
+ dreg = CC;
+
+#else
+#define GET_PDA_SAFE(preg) \
+ preg.l = _cpu_pda; \
+ preg.h = _cpu_pda;
+
+#define GET_PDA(preg, dreg) GET_PDA_SAFE(preg)
+#endif /* CONFIG_SMP */
+
+#endif /* __ASSEMBLY__ */
+
#endif /* _MEM_MAP_533_H_ */