From 5e4417f921238b5acf101bfcd59a7b3463fb2dbd Mon Sep 17 00:00:00 2001
From: Max Filippov <jcmvbkbc@gmail.com>
Date: Fri, 31 Jan 2020 20:11:24 -0800
Subject: xtensa: reorganize vectors placement

Allow vectors to be either merged into the kernel .text or put at a
fixed virtual address independently of XIP option. Drop option that
puts vectors at a fixed offset from the kernel text. Add choice to
Kconfig.
Vectors at fixed virtual address may be useful for XIP-aware MTD support
and for noMMU configurations with available IRAM. Configurations without
VECBASE register must put their vectors at specific locations regardless
of the selected option. All other configurations should happily use
merged vectors.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
 arch/xtensa/kernel/setup.c       |  4 ++--
 arch/xtensa/kernel/vmlinux.lds.S | 21 ++++++++++++++-------
 2 files changed, 16 insertions(+), 9 deletions(-)

(limited to 'arch/xtensa/kernel')

diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index fefbdce1db99..1e9b9e7d9583 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -349,7 +349,7 @@ void __init setup_arch(char **cmdline_p)
 	mem_reserve(__pa(_xip_start), __pa(_xip_end));
 #endif
 
-#ifdef CONFIG_VECTORS_OFFSET
+#ifdef CONFIG_VECTORS_ADDR
 	mem_reserve(__pa(&_WindowVectors_text_start),
 		    __pa(&_WindowVectors_text_end));
 
@@ -388,7 +388,7 @@ void __init setup_arch(char **cmdline_p)
 		    __pa(&_Level6InterruptVector_text_end));
 #endif
 
-#endif /* CONFIG_VECTORS_OFFSET */
+#endif /* CONFIG_VECTORS_ADDR */
 
 #ifdef CONFIG_SMP
 	mem_reserve(__pa(&_SecondaryResetVector_text_start),
diff --git a/arch/xtensa/kernel/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S
index d9e547810b6c..d23a6e38f062 100644
--- a/arch/xtensa/kernel/vmlinux.lds.S
+++ b/arch/xtensa/kernel/vmlinux.lds.S
@@ -47,9 +47,15 @@ jiffies = jiffies_64;
 	LONG(sym ## _end);			\
 	LONG(LOADADDR(section))
 
+#if !defined(CONFIG_VECTORS_ADDR) && XCHAL_HAVE_VECBASE
+#define MERGED_VECTORS 1
+#else
+#define MERGED_VECTORS 0
+#endif
+
 /*
- * Macro to define a section for a vector. When CONFIG_VECTORS_OFFSET is
- * defined code for every vector is located with other init data. At startup
+ * Macro to define a section for a vector. When MERGED_VECTORS is 0
+ * code for every vector is located with other init data. At startup
  * time head.S copies code for every vector to its final position according
  * to description recorded in the corresponding RELOCATE_ENTRY.
  */
@@ -84,7 +90,7 @@ SECTIONS
     /* The HEAD_TEXT section must be the first section! */
     HEAD_TEXT
 
-#ifndef CONFIG_VECTORS_OFFSET
+#if MERGED_VECTORS
     . = ALIGN(PAGE_SIZE);
     _vecbase = .;
 
@@ -159,7 +165,7 @@ SECTIONS
     . = ALIGN(16);
     __boot_reloc_table_start = ABSOLUTE(.);
 
-#ifdef CONFIG_VECTORS_OFFSET
+#if !MERGED_VECTORS
     RELOCATE_ENTRY(_WindowVectors_text,
 		   .WindowVectors.text);
 #if XCHAL_EXCM_LEVEL >= 2
@@ -220,7 +226,7 @@ SECTIONS
 #undef LAST
 #define LAST	.dummy
 
-#ifdef CONFIG_VECTORS_OFFSET
+#if !MERGED_VECTORS
   /* The vectors are relocated to the real position at startup time */
 
   SECTION_VECTOR4 (_WindowVectors_text,
@@ -299,7 +305,7 @@ SECTIONS
 #define LAST .SecondaryResetVector.text
 
 #endif
-#ifdef CONFIG_VECTORS_OFFSET
+#if !MERGED_VECTORS
   SECTION_VECTOR4 (_exception_text,
 		  .exception.text,
 		  ,
@@ -310,6 +316,7 @@ SECTIONS
 #endif
   . = (LOADADDR(LAST) + SIZEOF(LAST) + 3) & ~ 3;
 
+  .dummy1 : AT(ADDR(.dummy1)) { LONG(0) }
   . = ALIGN(PAGE_SIZE);
 
 #ifndef CONFIG_XIP_KERNEL
@@ -327,7 +334,7 @@ SECTIONS
 
 #undef LOAD_OFFSET
 #define LOAD_OFFSET \
-  (CONFIG_XIP_DATA_ADDR - (LOADADDR(.dummy) + SIZEOF(.dummy) + 3) & ~ 3)
+  (CONFIG_XIP_DATA_ADDR - (LOADADDR(.dummy1) + SIZEOF(.dummy1) + 3) & ~ 3)
 
   _xip_data_start = .;
   _sdata = .;
-- 
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