arch/tile: Split the icache flush code off to a generic <arch> header.

This code is used in other places in our system than in Linux, so
to share it we now implement it as an inline function in our low-level
<arch> headers, and instantiate it in one file in Linux's arch/tile/lib.
The file is now cacheflush.c and is C code rather than the strangely-named
and assembler-implemented __invalidate_icache.S.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

3 files changed, 24 insertions, 107 deletions

diff --git a/arch/tile/lib/Makefile b/arch/tile/lib/Makefile
index ea9c209d33fb..438af38bc9eb 100644
--- a/arch/tile/lib/Makefile
+++ b/arch/tile/lib/Makefile
@@ -2,7 +2,7 @@
 # Makefile for TILE-specific library files..
 #
 
-lib-y = checksum.o cpumask.o delay.o __invalidate_icache.o \
+lib-y = cacheflush.o checksum.o cpumask.o delay.o \
         mb_incoherent.o uaccess.o \
         memcpy_$(BITS).o memchr_$(BITS).o memmove_$(BITS).o memset_$(BITS).o \
         strchr_$(BITS).o strlen_$(BITS).o
diff --git a/arch/tile/lib/__invalidate_icache.S b/arch/tile/lib/__invalidate_icache.S
deleted file mode 100644
index 92e705059127..000000000000
--- a/arch/tile/lib/__invalidate_icache.S
+++ /dev/null
@@ -1,106 +0,0 @@
-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- *   This program is free software; you can redistribute it and/or
- *   modify it under the terms of the GNU General Public License
- *   as published by the Free Software Foundation, version 2.
- *
- *   This program is distributed in the hope that it will be useful, but
- *   WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- * A routine for synchronizing the instruction and data caches.
- * Useful for self-modifying code.
- *
- * r0 holds the buffer address
- * r1 holds the size in bytes
- */
-
-#include <arch/chip.h>
-#include <feedback.h>
-
-#if defined(__NEWLIB__) || defined(__BME__)
-#include <sys/page.h>
-#else
-#include <asm/page.h>
-#endif
-
-#ifdef __tilegx__
-/* Share code among Tile family chips but adjust opcodes appropriately. */
-#define slt cmpltu
-#define bbst blbst
-#define bnezt bnzt
-#endif
-
-#if defined(__tilegx__) && __SIZEOF_POINTER__ == 4
-/* Force 32-bit ops so pointers wrap around appropriately. */
-#define ADD_PTR addx
-#define ADDI_PTR addxi
-#else
-#define ADD_PTR add
-#define ADDI_PTR addi
-#endif
-
-        .section .text.__invalidate_icache, "ax"
-        .global __invalidate_icache
-        .type __invalidate_icache,@function
-        .hidden __invalidate_icache
-        .align 8
-__invalidate_icache:
-        FEEDBACK_ENTER(__invalidate_icache)
-        {
-         ADD_PTR r1, r0, r1       /* end of buffer */
-         blez r1, .Lexit      /* skip out if size <= 0 */
-        }
-        {
-         ADDI_PTR r1, r1, -1      /* point to last byte to flush */
-         andi r0, r0, -CHIP_L1I_LINE_SIZE()  /* align to cache-line size */
-        }
-        {
-         andi r1, r1, -CHIP_L1I_LINE_SIZE()  /* last cache line to flush */
-         mf
-        }
-#if CHIP_L1I_CACHE_SIZE() > PAGE_SIZE
-        {
-         moveli r4, CHIP_L1I_CACHE_SIZE() / PAGE_SIZE  /* loop counter */
-         move r2, r0          /* remember starting address */
-        }
-#endif
-        drain
-        {
-         slt r3, r0, r1       /* set up loop invariant */
-#if CHIP_L1I_CACHE_SIZE() > PAGE_SIZE
-         moveli r6, PAGE_SIZE
-#endif
-        }
-.Lentry:
-        {
-         icoh r0
-         ADDI_PTR r0, r0, CHIP_L1I_LINE_SIZE()   /* advance buffer */
-        }
-        {
-         slt r3, r0, r1       /* check if buffer < buffer + size */
-         bbst r3, .Lentry     /* loop if buffer < buffer + size */
-        }
-#if CHIP_L1I_CACHE_SIZE() > PAGE_SIZE
-        {
-         ADD_PTR r2, r2, r6
-         ADD_PTR r1, r1, r6
-        }
-        {
-         move r0, r2
-         addi r4, r4, -1
-        }
-        {
-         slt r3, r0, r1        /* set up loop invariant */
-         bnezt r4, .Lentry
-        }
-#endif
-        drain
-.Lexit:
-        jrp lr
-
-.Lend___invalidate_icache:
-        .size __invalidate_icache, \
-                .Lend___invalidate_icache - __invalidate_icache
diff --git a/arch/tile/lib/cacheflush.c b/arch/tile/lib/cacheflush.c
new file mode 100644
index 000000000000..11b6164c2097
--- /dev/null
+++ b/arch/tile/lib/cacheflush.c
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#include <asm/page.h>
+#include <asm/cacheflush.h>
+#include <arch/icache.h>
+
+
+void __flush_icache_range(unsigned long start, unsigned long end)
+{
+        invalidate_icache((const void *)start, end - start, PAGE_SIZE);
+}