43 lines
1.3 KiB
Diff
43 lines
1.3 KiB
Diff
This is an incomplete proof of concept that I applied to be able to
|
|
build a 64 bit kernel with GCC-4.4. It doesn't handle the 32 bit case
|
|
or the R4000_WAR case.
|
|
|
|
Comments welcome.
|
|
|
|
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
|
|
---
|
|
arch/mips/include/asm/compiler.h | 7 +++++++
|
|
arch/mips/include/asm/delay.h | 4 ++++
|
|
2 files changed, 11 insertions(+), 0 deletions(-)
|
|
|
|
--- a/arch/mips/include/asm/compiler.h
|
|
+++ b/arch/mips/include/asm/compiler.h
|
|
@@ -16,4 +16,11 @@
|
|
#define GCC_REG_ACCUM "accum"
|
|
#endif
|
|
|
|
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
|
|
+#define GCC_NO_H_CONSTRAINT
|
|
+#ifdef CONFIG_64BIT
|
|
+typedef unsigned int uint128_t __attribute__((mode(TI)));
|
|
+#endif
|
|
+#endif
|
|
+
|
|
#endif /* _ASM_COMPILER_H */
|
|
--- a/arch/mips/include/asm/delay.h
|
|
+++ b/arch/mips/include/asm/delay.h
|
|
@@ -83,10 +83,14 @@ static inline void __udelay(unsigned lon
|
|
: "r" (usecs), "r" (lpj)
|
|
: GCC_REG_ACCUM);
|
|
else if (sizeof(long) == 8 && !R4000_WAR)
|
|
+#ifdef GCC_NO_H_CONSTRAINT
|
|
+ usecs = ((uint128_t)usecs * lpj) >> 64;
|
|
+#else
|
|
__asm__("dmultu\t%2, %3"
|
|
: "=h" (usecs), "=l" (lo)
|
|
: "r" (usecs), "r" (lpj)
|
|
: GCC_REG_ACCUM);
|
|
+#endif
|
|
else if (sizeof(long) == 8 && R4000_WAR)
|
|
__asm__("dmultu\t%3, %4\n\tmfhi\t%0"
|
|
: "=r" (usecs), "=h" (hi), "=l" (lo)
|