[MIPS] Enable support for the userlocal hardware register
Which will cut down the cost of RDHWR $29 which is used to obtain the
TLS pointer and so far being emulated in software down to a single cycle
operation.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/cpu-features.h b/include/asm-mips/cpu-features.h
index 5e4bed1..d95a83e 100644
--- a/include/asm-mips/cpu-features.h
+++ b/include/asm-mips/cpu-features.h
@@ -150,6 +150,10 @@
#define cpu_has_mipsmt (cpu_data[0].ases & MIPS_ASE_MIPSMT)
#endif
+#ifndef cpu_has_userlocal
+#define cpu_has_userlocal (cpu_data[0].options & MIPS_CPU_ULRI)
+#endif
+
#ifdef CONFIG_32BIT
# ifndef cpu_has_nofpuex
# define cpu_has_nofpuex (cpu_data[0].options & MIPS_CPU_NOFPUEX)
diff --git a/include/asm-mips/cpu.h b/include/asm-mips/cpu.h
index 2924069..49c1f00 100644
--- a/include/asm-mips/cpu.h
+++ b/include/asm-mips/cpu.h
@@ -257,6 +257,7 @@
#define MIPS_CPU_PREFETCH 0x00080000 /* CPU has usable prefetch */
#define MIPS_CPU_VINT 0x00100000 /* CPU supports MIPSR2 vectored interrupts */
#define MIPS_CPU_VEIC 0x00200000 /* CPU supports MIPSR2 external interrupt controller mode */
+#define MIPS_CPU_ULRI 0x00400000 /* CPU has ULRI feature */
/*
* CPU ASE encodings
diff --git a/include/asm-mips/mipsregs.h b/include/asm-mips/mipsregs.h
index 89c8192..668db02 100644
--- a/include/asm-mips/mipsregs.h
+++ b/include/asm-mips/mipsregs.h
@@ -7,7 +7,7 @@
* Copyright (C) 2000 Silicon Graphics, Inc.
* Modified for further R[236]000 support by Paul M. Antoine, 1996.
* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
- * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
+ * Copyright (C) 2000, 07 MIPS Technologies, Inc.
* Copyright (C) 2003, 2004 Maciej W. Rozycki
*/
#ifndef _ASM_MIPSREGS_H
@@ -533,6 +533,7 @@
#define MIPS_CONF3_VEIC (_ULCAST_(1) << 6)
#define MIPS_CONF3_LPA (_ULCAST_(1) << 7)
#define MIPS_CONF3_DSP (_ULCAST_(1) << 10)
+#define MIPS_CONF3_ULRI (_ULCAST_(1) << 13)
#define MIPS_CONF7_WII (_ULCAST_(1) << 31)
@@ -772,6 +773,9 @@
#define read_c0_context() __read_ulong_c0_register($4, 0)
#define write_c0_context(val) __write_ulong_c0_register($4, 0, val)
+#define read_c0_userlocal() __read_ulong_c0_register($4, 2)
+#define write_c0_userlocal(val) __write_ulong_c0_register($4, 2, val)
+
#define read_c0_pagemask() __read_32bit_c0_register($5, 0)
#define write_c0_pagemask(val) __write_32bit_c0_register($5, 0, val)
diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
index 9b3a8dd..be64fc5 100644
--- a/include/asm-mips/system.h
+++ b/include/asm-mips/system.h
@@ -67,6 +67,8 @@
(last) = resume(prev, next, task_thread_info(next)); \
if (cpu_has_dsp) \
__restore_dsp(current); \
+ if (cpu_has_userlocal) \
+ write_c0_userlocal(task_thread_info(current)->tp_value);\
} while(0)
/*