xtensa: add support for the xtensa processor architecture [2/2]
The Xtensa processor architecture is a configurable, extensible,
and synthesizable 32-bit RISC processor core provided by Tensilica, inc.
This is the second part of the basic architecture port, adding the
'arch/xtensa' directory and a readme file.
Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/xtensa/include/asm/regs.h b/arch/xtensa/include/asm/regs.h
new file mode 100644
index 0000000..0a82a22
--- /dev/null
+++ b/arch/xtensa/include/asm/regs.h
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2006 Tensilica, Inc. All Rights Reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _XTENSA_REGS_H
+#define _XTENSA_REGS_H
+
+/* Special registers */
+
+#define IBREAKA 128
+#define DBREAKA 144
+#define DBREAKC 160
+
+/* Special names for read-only and write-only interrupt registers */
+
+#define INTREAD 226
+#define INTSET 226
+#define INTCLEAR 227
+
+/* EXCCAUSE register fields */
+
+#define EXCCAUSE_EXCCAUSE_SHIFT 0
+#define EXCCAUSE_EXCCAUSE_MASK 0x3F
+
+#define EXCCAUSE_ILLEGAL_INSTRUCTION 0
+#define EXCCAUSE_SYSTEM_CALL 1
+#define EXCCAUSE_INSTRUCTION_FETCH_ERROR 2
+#define EXCCAUSE_LOAD_STORE_ERROR 3
+#define EXCCAUSE_LEVEL1_INTERRUPT 4
+#define EXCCAUSE_ALLOCA 5
+#define EXCCAUSE_INTEGER_DIVIDE_BY_ZERO 6
+#define EXCCAUSE_SPECULATION 7
+#define EXCCAUSE_PRIVILEGED 8
+#define EXCCAUSE_UNALIGNED 9
+#define EXCCAUSE_INSTR_DATA_ERROR 12
+#define EXCCAUSE_LOAD_STORE_DATA_ERROR 13
+#define EXCCAUSE_INSTR_ADDR_ERROR 14
+#define EXCCAUSE_LOAD_STORE_ADDR_ERROR 15
+#define EXCCAUSE_ITLB_MISS 16
+#define EXCCAUSE_ITLB_MULTIHIT 17
+#define EXCCAUSE_ITLB_PRIVILEGE 18
+#define EXCCAUSE_ITLB_SIZE_RESTRICTION 19
+#define EXCCAUSE_FETCH_CACHE_ATTRIBUTE 20
+#define EXCCAUSE_DTLB_MISS 24
+#define EXCCAUSE_DTLB_MULTIHIT 25
+#define EXCCAUSE_DTLB_PRIVILEGE 26
+#define EXCCAUSE_DTLB_SIZE_RESTRICTION 27
+#define EXCCAUSE_LOAD_CACHE_ATTRIBUTE 28
+#define EXCCAUSE_STORE_CACHE_ATTRIBUTE 29
+#define EXCCAUSE_COPROCESSOR0_DISABLED 32
+#define EXCCAUSE_COPROCESSOR1_DISABLED 33
+#define EXCCAUSE_COPROCESSOR2_DISABLED 34
+#define EXCCAUSE_COPROCESSOR3_DISABLED 35
+#define EXCCAUSE_COPROCESSOR4_DISABLED 36
+#define EXCCAUSE_COPROCESSOR5_DISABLED 37
+#define EXCCAUSE_COPROCESSOR6_DISABLED 38
+#define EXCCAUSE_COPROCESSOR7_DISABLED 39
+#define EXCCAUSE_LAST 63
+
+/* PS register fields */
+
+#define PS_WOE_BIT 18
+#define PS_CALLINC_SHIFT 16
+#define PS_CALLINC_MASK 0x00030000
+#define PS_OWB_SHIFT 8
+#define PS_OWB_MASK 0x00000F00
+#define PS_RING_SHIFT 6
+#define PS_RING_MASK 0x000000C0
+#define PS_UM_BIT 5
+#define PS_EXCM_BIT 4
+#define PS_INTLEVEL_SHIFT 0
+#define PS_INTLEVEL_MASK 0x0000000F
+
+/* DBREAKCn register fields */
+
+#define DBREAKC_MASK_BIT 0
+#define DBREAKC_MASK_MASK 0x0000003F
+#define DBREAKC_LOAD_BIT 30
+#define DBREAKC_LOAD_MASK 0x40000000
+#define DBREAKC_STOR_BIT 31
+#define DBREAKC_STOR_MASK 0x80000000
+
+/* DEBUGCAUSE register fields */
+
+#define DEBUGCAUSE_DEBUGINT_BIT 5 /* External debug interrupt */
+#define DEBUGCAUSE_BREAKN_BIT 4 /* BREAK.N instruction */
+#define DEBUGCAUSE_BREAK_BIT 3 /* BREAK instruction */
+#define DEBUGCAUSE_DBREAK_BIT 2 /* DBREAK match */
+#define DEBUGCAUSE_IBREAK_BIT 1 /* IBREAK match */
+#define DEBUGCAUSE_ICOUNT_BIT 0 /* ICOUNT would incr. to zero */
+
+#endif /* _XTENSA_SPECREG_H */
+