File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/arch/mips/lib/uncached.c b/arch/mips/lib/uncached.c
new file mode 100644
index 0000000..09d5dee
--- /dev/null
+++ b/arch/mips/lib/uncached.c
@@ -0,0 +1,80 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005 Thiemo Seufer
+ * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
+ * Author: Maciej W. Rozycki <macro@mips.com>
+ */
+
+
+#include <asm/addrspace.h>
+#include <asm/bug.h>
+#include <asm/cacheflush.h>
+
+#ifndef CKSEG2
+#define CKSEG2 CKSSEG
+#endif
+#ifndef TO_PHYS_MASK
+#define TO_PHYS_MASK -1
+#endif
+
+/*
+ * FUNC is executed in one of the uncached segments, depending on its
+ * original address as follows:
+ *
+ * 1. If the original address is in CKSEG0 or CKSEG1, then the uncached
+ * segment used is CKSEG1.
+ * 2. If the original address is in XKPHYS, then the uncached segment
+ * used is XKPHYS(2).
+ * 3. Otherwise it's a bug.
+ *
+ * The same remapping is done with the stack pointer. Stack handling
+ * works because we don't handle stack arguments or more complex return
+ * values, so we can avoid sharing the same stack area between a cached
+ * and the uncached mode.
+ */
+unsigned long run_uncached(void *func)
+{
+ register long sp __asm__("$sp");
+ register long ret __asm__("$2");
+ long lfunc = (long)func, ufunc;
+ long usp;
+
+ if (sp >= (long)CKSEG0 && sp < (long)CKSEG2)
+ usp = CKSEG1ADDR(sp);
+#ifdef CONFIG_64BIT
+ else if ((long long)sp >= (long long)PHYS_TO_XKPHYS(0, 0) &&
+ (long long)sp < (long long)PHYS_TO_XKPHYS(8, 0))
+ usp = PHYS_TO_XKPHYS(K_CALG_UNCACHED,
+ XKPHYS_TO_PHYS((long long)sp));
+#endif
+ else {
+ BUG();
+ usp = sp;
+ }
+ if (lfunc >= (long)CKSEG0 && lfunc < (long)CKSEG2)
+ ufunc = CKSEG1ADDR(lfunc);
+#ifdef CONFIG_64BIT
+ else if ((long long)lfunc >= (long long)PHYS_TO_XKPHYS(0, 0) &&
+ (long long)lfunc < (long long)PHYS_TO_XKPHYS(8, 0))
+ ufunc = PHYS_TO_XKPHYS(K_CALG_UNCACHED,
+ XKPHYS_TO_PHYS((long long)lfunc));
+#endif
+ else {
+ BUG();
+ ufunc = lfunc;
+ }
+
+ __asm__ __volatile__ (
+ " move $16, $sp\n"
+ " move $sp, %1\n"
+ " jalr %2\n"
+ " move $sp, $16"
+ : "=r" (ret)
+ : "r" (usp), "r" (ufunc)
+ : "$16", "$31");
+
+ return ret;
+}