AArch32: Add assembly helpers

This patch adds various assembly helpers for AArch32 like :

* cache management : Functions to flush, invalidate and clean
cache by MVA. Also helpers to do cache operations by set-way
are also added.

* stack management: Macros to declare stack and get the current
stack corresponding to current CPU.

* Misc: Macros to access co processor registers in AArch32,
macros to define functions in assembly, assert macros, generic
`do_panic()` implementation and function to zero block of memory.

Change-Id: I7b78ca3f922c0eda39beb9786b7150e9193425be

3 files changed, 145 insertions, 2 deletions

diff --git a/include/common/aarch32/asm_macros.S b/include/common/aarch32/asm_macros.S
new file mode 100644
index 00000000..11e45bbf
--- /dev/null
+++ b/include/common/aarch32/asm_macros.S
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef __ASM_MACROS_S__
+#define __ASM_MACROS_S__
+
+#include <arch.h>
+#include <asm_macros_common.S>
+
+#define WORD_SIZE	4
+
+	/*
+	 * Co processor register accessors
+	 */
+	.macro ldcopr reg, coproc, opc1, CRn, CRm, opc2
+	mrc	\coproc, \opc1, \reg, \CRn, \CRm, \opc2
+	.endm
+
+	.macro ldcopr16 reg1, reg2, coproc, opc1, CRm
+	mrrc	\coproc, \opc1, \reg1, \reg2, \CRm
+	.endm
+
+	.macro stcopr reg, coproc, opc1, CRn, CRm, opc2
+	mcr	\coproc, \opc1, \reg, \CRn, \CRm, \opc2
+	.endm
+
+	.macro stcopr16 reg1, reg2, coproc, opc1, CRm
+	mcrr	\coproc, \opc1, \reg1, \reg2, \CRm
+	.endm
+
+	/* Cache line size helpers */
+	.macro	dcache_line_size  reg, tmp
+	ldcopr	\tmp, CTR
+	ubfx	\tmp, \tmp, #CTR_DMINLINE_SHIFT, #CTR_DMINLINE_WIDTH
+	mov	\reg, #WORD_SIZE
+	lsl	\reg, \reg, \tmp
+	.endm
+
+	.macro	icache_line_size  reg, tmp
+	ldcopr	\tmp, CTR
+	and	\tmp, \tmp, #CTR_IMINLINE_MASK
+	mov	\reg, #WORD_SIZE
+	lsl	\reg, \reg, \tmp
+	.endm
+
+	/*
+	 * This macro calculates the base address of the current CPU's multi
+	 * processor(MP) stack using the plat_my_core_pos() index, the name of
+	 * the stack storage and the size of each stack.
+	 * Out: r0 = physical address of stack base
+	 * Clobber: r14, r1, r2
+	 */
+	.macro get_my_mp_stack _name, _size
+	bl  plat_my_core_pos
+	ldr r2, =(\_name + \_size)
+	mov r1, #\_size
+	mla r0, r0, r1, r2
+	.endm
+
+	/*
+	 * This macro calculates the base address of a uniprocessor(UP) stack
+	 * using the name of the stack storage and the size of the stack
+	 * Out: r0 = physical address of stack base
+	 */
+	.macro get_up_stack _name, _size
+	ldr r0, =(\_name + \_size)
+	.endm
+
+#endif /* __ASM_MACROS_S__ */
diff --git a/include/common/aarch32/assert_macros.S b/include/common/aarch32/assert_macros.S
new file mode 100644
index 00000000..f35fc6af
--- /dev/null
+++ b/include/common/aarch32/assert_macros.S
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef __ASSERT_MACROS_S__
+#define __ASSERT_MACROS_S__
+
+	/*
+	 * Assembler macro to enable asm_assert. We assume that the stack is
+	 * initialized prior to invoking this macro.
+	 */
+#define ASM_ASSERT(_cc) \
+.ifndef .L_assert_filename ;\
+	.pushsection .rodata.str1.1, "aS" ;\
+	.L_assert_filename: ;\
+			.string	__FILE__ ;\
+	.popsection ;\
+.endif ;\
+	b##_cc	300f ;\
+	ldr	r0, =.L_assert_filename ;\
+	mov	r1, #__LINE__ ;\
+	b	. ;\
+300:
+
+#endif /* __ASSERT_MACROS_S__ */
diff --git a/include/common/asm_macros_common.S b/include/common/asm_macros_common.S
index ee59a939..023124b3 100644
--- a/include/common/asm_macros_common.S
+++ b/include/common/asm_macros_common.S
@@ -30,8 +30,6 @@
 #ifndef __ASM_MACROS_COMMON_S__
 #define __ASM_MACROS_COMMON_S__
 
-#include <arch.h>
-
 	/*
 	 * This macro is used to create a function label and place the
 	 * code into a separate text section based on the function name