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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/unicore32/lib
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/unicore32/lib')
-rw-r--r--kernel/arch/unicore32/lib/Makefile27
-rw-r--r--kernel/arch/unicore32/lib/backtrace.S163
-rw-r--r--kernel/arch/unicore32/lib/clear_user.S57
-rw-r--r--kernel/arch/unicore32/lib/copy_from_user.S108
-rw-r--r--kernel/arch/unicore32/lib/copy_page.S39
-rw-r--r--kernel/arch/unicore32/lib/copy_template.S214
-rw-r--r--kernel/arch/unicore32/lib/copy_to_user.S96
-rw-r--r--kernel/arch/unicore32/lib/delay.S51
-rw-r--r--kernel/arch/unicore32/lib/findbit.S100
-rw-r--r--kernel/arch/unicore32/lib/strncpy_from_user.S45
-rw-r--r--kernel/arch/unicore32/lib/strnlen_user.S42
11 files changed, 942 insertions, 0 deletions
diff --git a/kernel/arch/unicore32/lib/Makefile b/kernel/arch/unicore32/lib/Makefile
new file mode 100644
index 000000000..87229a558
--- /dev/null
+++ b/kernel/arch/unicore32/lib/Makefile
@@ -0,0 +1,27 @@
+#
+# linux/arch/unicore32/lib/Makefile
+#
+# Copyright (C) 2001-2010 GUAN Xue-tao
+#
+
+lib-y := backtrace.o delay.o findbit.o
+lib-y += strncpy_from_user.o strnlen_user.o
+lib-y += clear_user.o copy_page.o
+lib-y += copy_from_user.o copy_to_user.o
+
+GNU_LIBC_A := $(shell $(CC) $(KBUILD_CFLAGS) -print-file-name=libc.a)
+GNU_LIBC_A_OBJS := memchr.o memcpy.o memmove.o memset.o
+GNU_LIBC_A_OBJS += strchr.o strrchr.o
+GNU_LIBC_A_OBJS += rawmemchr.o # needed by strrchr.o
+
+GNU_LIBGCC_A := $(shell $(CC) $(KBUILD_CFLAGS) -print-file-name=libgcc.a)
+GNU_LIBGCC_A_OBJS := _ashldi3.o _ashrdi3.o _lshrdi3.o
+GNU_LIBGCC_A_OBJS += _divsi3.o _modsi3.o _ucmpdi2.o _umodsi3.o _udivsi3.o
+
+lib-y += $(GNU_LIBC_A_OBJS) $(GNU_LIBGCC_A_OBJS)
+
+$(addprefix $(obj)/, $(GNU_LIBC_A_OBJS)):
+ $(Q)$(AR) p $(GNU_LIBC_A) $(notdir $@) > $@
+
+$(addprefix $(obj)/, $(GNU_LIBGCC_A_OBJS)):
+ $(Q)$(AR) p $(GNU_LIBGCC_A) $(notdir $@) > $@
diff --git a/kernel/arch/unicore32/lib/backtrace.S b/kernel/arch/unicore32/lib/backtrace.S
new file mode 100644
index 000000000..ef01d77f2
--- /dev/null
+++ b/kernel/arch/unicore32/lib/backtrace.S
@@ -0,0 +1,163 @@
+/*
+ * linux/arch/unicore32/lib/backtrace.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+ .text
+
+@ fp is 0 or stack frame
+
+#define frame v4
+#define sv_fp v5
+#define sv_pc v6
+#define offset v8
+
+ENTRY(__backtrace)
+ mov r0, fp
+
+ENTRY(c_backtrace)
+
+#if !defined(CONFIG_FRAME_POINTER) || !defined(CONFIG_PRINTK)
+ mov pc, lr
+ENDPROC(__backtrace)
+ENDPROC(c_backtrace)
+#else
+ stm.w (v4 - v8, lr), [sp-] @ Save an extra register
+ @ so we have a location...
+ mov.a frame, r0 @ if frame pointer is zero
+ beq no_frame @ we have no stack frames
+
+1: stm.w (pc), [sp-] @ calculate offset of PC stored
+ ldw.w r0, [sp]+, #4 @ by stmfd for this CPU
+ adr r1, 1b
+ sub offset, r0, r1
+
+/*
+ * Stack frame layout:
+ * optionally saved caller registers (r4 - r10)
+ * saved fp
+ * saved sp
+ * saved lr
+ * frame => saved pc
+ * optionally saved arguments (r0 - r3)
+ * saved sp => <next word>
+ *
+ * Functions start with the following code sequence:
+ * mov ip, sp
+ * stm.w (r0 - r3), [sp-] (optional)
+ * corrected pc => stm.w sp, (..., fp, ip, lr, pc)
+ */
+for_each_frame:
+
+1001: ldw sv_pc, [frame+], #0 @ get saved pc
+1002: ldw sv_fp, [frame+], #-12 @ get saved fp
+
+ sub sv_pc, sv_pc, offset @ Correct PC for prefetching
+
+1003: ldw r2, [sv_pc+], #-4 @ if stmfd sp, {args} exists,
+ ldw r3, .Ldsi+4 @ adjust saved 'pc' back one
+ cxor.a r3, r2 >> #14 @ instruction
+ beq 201f
+ sub r0, sv_pc, #4 @ allow for mov
+ b 202f
+201:
+ sub r0, sv_pc, #8 @ allow for mov + stmia
+202:
+ ldw r1, [frame+], #-4 @ get saved lr
+ mov r2, frame
+ b.l dump_backtrace_entry
+
+ ldw r1, [sv_pc+], #-4 @ if stmfd sp, {args} exists,
+ ldw r3, .Ldsi+4
+ cxor.a r3, r1 >> #14
+ bne 1004f
+ ldw r0, [frame+], #-8 @ get sp
+ sub r0, r0, #4 @ point at the last arg
+ b.l .Ldumpstm @ dump saved registers
+
+1004: ldw r1, [sv_pc+], #0 @ if stmfd {, fp, ip, lr, pc}
+ ldw r3, .Ldsi @ instruction exists,
+ cxor.a r3, r1 >> #14
+ bne 201f
+ sub r0, frame, #16
+ b.l .Ldumpstm @ dump saved registers
+201:
+ cxor.a sv_fp, #0 @ zero saved fp means
+ beq no_frame @ no further frames
+
+ csub.a sv_fp, frame @ next frame must be
+ mov frame, sv_fp @ above the current frame
+ bua for_each_frame
+
+1006: adr r0, .Lbad
+ mov r1, frame
+ b.l printk
+no_frame: ldm.w (v4 - v8, pc), [sp]+
+ENDPROC(__backtrace)
+ENDPROC(c_backtrace)
+
+ .pushsection __ex_table,"a"
+ .align 3
+ .long 1001b, 1006b
+ .long 1002b, 1006b
+ .long 1003b, 1006b
+ .long 1004b, 1006b
+ .popsection
+
+#define instr v4
+#define reg v5
+#define stack v6
+
+.Ldumpstm: stm.w (instr, reg, stack, v7, lr), [sp-]
+ mov stack, r0
+ mov instr, r1
+ mov reg, #14
+ mov v7, #0
+1: mov r3, #1
+ csub.a reg, #8
+ bne 201f
+ sub reg, reg, #3
+201:
+ cand.a instr, r3 << reg
+ beq 2f
+ add v7, v7, #1
+ cxor.a v7, #6
+ cmoveq v7, #1
+ cmoveq r1, #'\n'
+ cmovne r1, #' '
+ ldw.w r3, [stack]+, #-4
+ mov r2, reg
+ csub.a r2, #8
+ bsl 201f
+ sub r2, r2, #3
+201:
+ cand.a instr, #0x40 @ if H is 1, high 16 regs
+ beq 201f
+ add r2, r2, #0x10 @ so r2 need add 16
+201:
+ adr r0, .Lfp
+ b.l printk
+2: sub.a reg, reg, #1
+ bns 1b
+ cxor.a v7, #0
+ beq 201f
+ adr r0, .Lcr
+ b.l printk
+201: ldm.w (instr, reg, stack, v7, pc), [sp]+
+
+.Lfp: .asciz "%cr%d:%08x"
+.Lcr: .asciz "\n"
+.Lbad: .asciz "Backtrace aborted due to bad frame pointer <%p>\n"
+ .align
+.Ldsi: .word 0x92eec000 >> 14 @ stm.w sp, (... fp, ip, lr, pc)
+ .word 0x92e10000 >> 14 @ stm.w sp, ()
+
+#endif
diff --git a/kernel/arch/unicore32/lib/clear_user.S b/kernel/arch/unicore32/lib/clear_user.S
new file mode 100644
index 000000000..20047f722
--- /dev/null
+++ b/kernel/arch/unicore32/lib/clear_user.S
@@ -0,0 +1,57 @@
+/*
+ * linux/arch/unicore32/lib/clear_user.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+ .text
+
+/* Prototype: int __clear_user(void *addr, size_t sz)
+ * Purpose : clear some user memory
+ * Params : addr - user memory address to clear
+ * : sz - number of bytes to clear
+ * Returns : number of bytes NOT cleared
+ */
+WEAK(__clear_user)
+ stm.w (lr), [sp-]
+ stm.w (r1), [sp-]
+ mov r2, #0
+ csub.a r1, #4
+ bsl 2f
+ and.a ip, r0, #3
+ beq 1f
+ csub.a ip, #2
+ strusr r2, r0, 1
+ strusr r2, r0, 1, el
+ strusr r2, r0, 1, sl
+ rsub ip, ip, #4
+ sub r1, r1, ip @ 7 6 5 4 3 2 1
+1: sub.a r1, r1, #8 @ -1 -2 -3 -4 -5 -6 -7
+ strusr r2, r0, 4, ns, rept=2
+ bns 1b
+ add.a r1, r1, #4 @ 3 2 1 0 -1 -2 -3
+ strusr r2, r0, 4, ns
+2: cand.a r1, #2 @ 1x 1x 0x 0x 1x 1x 0x
+ strusr r2, r0, 1, ne, rept=2
+ cand.a r1, #1 @ x1 x0 x1 x0 x1 x0 x1
+ beq 3f
+USER( stb.u r2, [r0])
+3: mov r0, #0
+ ldm.w (r1), [sp]+
+ ldm.w (pc), [sp]+
+ENDPROC(__clear_user)
+
+ .pushsection .fixup,"ax"
+ .align 0
+9001: ldm.w (r0), [sp]+
+ ldm.w (pc), [sp]+
+ .popsection
+
diff --git a/kernel/arch/unicore32/lib/copy_from_user.S b/kernel/arch/unicore32/lib/copy_from_user.S
new file mode 100644
index 000000000..ab0767ea5
--- /dev/null
+++ b/kernel/arch/unicore32/lib/copy_from_user.S
@@ -0,0 +1,108 @@
+/*
+ * linux/arch/unicore32/lib/copy_from_user.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Prototype:
+ *
+ * size_t __copy_from_user(void *to, const void *from, size_t n)
+ *
+ * Purpose:
+ *
+ * copy a block to kernel memory from user memory
+ *
+ * Params:
+ *
+ * to = kernel memory
+ * from = user memory
+ * n = number of bytes to copy
+ *
+ * Return value:
+ *
+ * Number of bytes NOT copied.
+ */
+
+ .macro ldr1w ptr reg abort
+ ldrusr \reg, \ptr, 4, abort=\abort
+ .endm
+
+ .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
+100: ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+
+ .pushsection __ex_table, "a"
+ .align 3
+ .long 100b, \abort
+ .popsection
+ .endm
+
+ .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+100: ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
+ .pushsection __ex_table, "a"
+ .align 3
+ .long 100b, \abort
+ .popsection
+ .endm
+
+ .macro ldr1b ptr reg cond=al abort
+ ldrusr \reg, \ptr, 1, \cond, abort=\abort
+ .endm
+
+ .macro str1w ptr reg abort
+ stw.w \reg, [\ptr]+, #4
+ .endm
+
+ .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+ stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
+ .endm
+
+ .macro str1b ptr reg cond=al abort
+ .ifnc \cond, al
+ b\cond 201f
+ b 202f
+ .endif
+201: stb.w \reg, [\ptr]+, #1
+202:
+ .endm
+
+ .macro enter
+ mov r3, #0
+ stm.w (r0, r2, r3), [sp-]
+ .endm
+
+ .macro exit
+ add sp, sp, #8
+ ldm.w (r0), [sp]+
+ mov pc, lr
+ .endm
+
+ .text
+
+ENTRY(__copy_from_user)
+
+#include "copy_template.S"
+
+ENDPROC(__copy_from_user)
+
+ .pushsection .fixup,"ax"
+ .align 0
+ copy_abort_preamble
+ ldm.w (r1, r2), [sp]+
+ sub r3, r0, r1
+ rsub r2, r3, r2
+ stw r2, [sp]
+ mov r1, #0
+ b.l memset
+ ldw.w r0, [sp]+, #4
+ copy_abort_end
+ .popsection
+
diff --git a/kernel/arch/unicore32/lib/copy_page.S b/kernel/arch/unicore32/lib/copy_page.S
new file mode 100644
index 000000000..3a448d755
--- /dev/null
+++ b/kernel/arch/unicore32/lib/copy_page.S
@@ -0,0 +1,39 @@
+/*
+ * linux/arch/unicore32/lib/copy_page.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * ASM optimised string functions
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <generated/asm-offsets.h>
+#include <asm/cache.h>
+
+#define COPY_COUNT (PAGE_SZ/256)
+
+ .text
+ .align 5
+/*
+ * UniCore optimised copy_page routine
+ */
+ENTRY(copy_page)
+ stm.w (r17 - r19, lr), [sp-]
+ mov r17, r0
+ mov r18, r1
+ mov r19, #COPY_COUNT
+1:
+ .rept 4
+ ldm.w (r0 - r15), [r18]+
+ stm.w (r0 - r15), [r17]+
+ .endr
+ sub.a r19, r19, #1
+ bne 1b
+ ldm.w (r17 - r19, pc), [sp]+
+ENDPROC(copy_page)
diff --git a/kernel/arch/unicore32/lib/copy_template.S b/kernel/arch/unicore32/lib/copy_template.S
new file mode 100644
index 000000000..524287fc0
--- /dev/null
+++ b/kernel/arch/unicore32/lib/copy_template.S
@@ -0,0 +1,214 @@
+/*
+ * linux/arch/unicore32/lib/copy_template.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * Theory of operation
+ * -------------------
+ *
+ * This file provides the core code for a forward memory copy used in
+ * the implementation of memcopy(), copy_to_user() and copy_from_user().
+ *
+ * The including file must define the following accessor macros
+ * according to the need of the given function:
+ *
+ * ldr1w ptr reg abort
+ *
+ * This loads one word from 'ptr', stores it in 'reg' and increments
+ * 'ptr' to the next word. The 'abort' argument is used for fixup tables.
+ *
+ * ldr4w ptr reg1 reg2 reg3 reg4 abort
+ * ldr8w ptr, reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+ *
+ * This loads four or eight words starting from 'ptr', stores them
+ * in provided registers and increments 'ptr' past those words.
+ * The'abort' argument is used for fixup tables.
+ *
+ * ldr1b ptr reg cond abort
+ *
+ * Similar to ldr1w, but it loads a byte and increments 'ptr' one byte.
+ * It also must apply the condition code if provided, otherwise the
+ * "al" condition is assumed by default.
+ *
+ * str1w ptr reg abort
+ * str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+ * str1b ptr reg cond abort
+ *
+ * Same as their ldr* counterparts, but data is stored to 'ptr' location
+ * rather than being loaded.
+ *
+ * enter
+ *
+ * Preserve the provided registers on the stack plus any additional
+ * data as needed by the implementation including this code. Called
+ * upon code entry.
+ *
+ * exit
+ *
+ * Restore registers with the values previously saved with the
+ * 'preserv' macro. Called upon code termination.
+ */
+
+
+ enter
+
+ sub.a r2, r2, #4
+ bsl 8f
+ and.a ip, r0, #3
+ bne 9f
+ and.a ip, r1, #3
+ bne 10f
+
+1: sub.a r2, r2, #(28)
+ stm.w (r5 - r8), [sp-]
+ bsl 5f
+
+3:
+4: ldr8w r1, r3, r4, r5, r6, r7, r8, r10, r11, abort=20f
+ sub.a r2, r2, #32
+ str8w r0, r3, r4, r5, r6, r7, r8, r10, r11, abort=20f
+ beg 3b
+
+5: and.a ip, r2, #28
+ rsub ip, ip, #32
+ beq 7f
+ add pc, pc, ip @ C is always clear here
+ nop
+
+ ldr1w r1, r3, abort=20f
+ ldr1w r1, r4, abort=20f
+ ldr1w r1, r5, abort=20f
+ ldr1w r1, r6, abort=20f
+ ldr1w r1, r7, abort=20f
+ ldr1w r1, r8, abort=20f
+ ldr1w r1, r11, abort=20f
+
+ add pc, pc, ip
+ nop
+
+ str1w r0, r3, abort=20f
+ str1w r0, r4, abort=20f
+ str1w r0, r5, abort=20f
+ str1w r0, r6, abort=20f
+ str1w r0, r7, abort=20f
+ str1w r0, r8, abort=20f
+ str1w r0, r11, abort=20f
+
+7: ldm.w (r5 - r8), [sp]+
+
+8: mov.a r2, r2 << #31
+ ldr1b r1, r3, ne, abort=21f
+ ldr1b r1, r4, ea, abort=21f
+ ldr1b r1, r10, ea, abort=21f
+ str1b r0, r3, ne, abort=21f
+ str1b r0, r4, ea, abort=21f
+ str1b r0, r10, ea, abort=21f
+
+ exit
+
+9: rsub ip, ip, #4
+ csub.a ip, #2
+ ldr1b r1, r3, sg, abort=21f
+ ldr1b r1, r4, eg, abort=21f
+ ldr1b r1, r11, abort=21f
+ str1b r0, r3, sg, abort=21f
+ str1b r0, r4, eg, abort=21f
+ sub.a r2, r2, ip
+ str1b r0, r11, abort=21f
+ bsl 8b
+ and.a ip, r1, #3
+ beq 1b
+
+10: andn r1, r1, #3
+ csub.a ip, #2
+ ldr1w r1, r11, abort=21f
+ beq 17f
+ bsg 18f
+
+
+ .macro forward_copy_shift a b
+
+ sub.a r2, r2, #28
+ bsl 14f
+
+11: stm.w (r5 - r9), [sp-]
+
+12:
+ ldr4w r1, r4, r5, r6, r7, abort=19f
+ mov r3, r11 pull #\a
+ sub.a r2, r2, #32
+ ldr4w r1, r8, r9, r10, r11, abort=19f
+ or r3, r3, r4 push #\b
+ mov r4, r4 pull #\a
+ or r4, r4, r5 push #\b
+ mov r5, r5 pull #\a
+ or r5, r5, r6 push #\b
+ mov r6, r6 pull #\a
+ or r6, r6, r7 push #\b
+ mov r7, r7 pull #\a
+ or r7, r7, r8 push #\b
+ mov r8, r8 pull #\a
+ or r8, r8, r9 push #\b
+ mov r9, r9 pull #\a
+ or r9, r9, r10 push #\b
+ mov r10, r10 pull #\a
+ or r10, r10, r11 push #\b
+ str8w r0, r3, r4, r5, r6, r7, r8, r9, r10, , abort=19f
+ beg 12b
+
+ ldm.w (r5 - r9), [sp]+
+
+14: and.a ip, r2, #28
+ beq 16f
+
+15: mov r3, r11 pull #\a
+ ldr1w r1, r11, abort=21f
+ sub.a ip, ip, #4
+ or r3, r3, r11 push #\b
+ str1w r0, r3, abort=21f
+ bsg 15b
+
+16: sub r1, r1, #(\b / 8)
+ b 8b
+
+ .endm
+
+
+ forward_copy_shift a=8 b=24
+
+17: forward_copy_shift a=16 b=16
+
+18: forward_copy_shift a=24 b=8
+
+
+/*
+ * Abort preamble and completion macros.
+ * If a fixup handler is required then those macros must surround it.
+ * It is assumed that the fixup code will handle the private part of
+ * the exit macro.
+ */
+
+ .macro copy_abort_preamble
+19: ldm.w (r5 - r9), [sp]+
+ b 21f
+299: .word 0 @ store lr
+ @ to avoid function call in fixup
+20: ldm.w (r5 - r8), [sp]+
+21:
+ adr r1, 299b
+ stw lr, [r1]
+ .endm
+
+ .macro copy_abort_end
+ adr lr, 299b
+ ldw pc, [lr]
+ .endm
+
diff --git a/kernel/arch/unicore32/lib/copy_to_user.S b/kernel/arch/unicore32/lib/copy_to_user.S
new file mode 100644
index 000000000..6e22151c8
--- /dev/null
+++ b/kernel/arch/unicore32/lib/copy_to_user.S
@@ -0,0 +1,96 @@
+/*
+ * linux/arch/unicore32/lib/copy_to_user.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Prototype:
+ *
+ * size_t __copy_to_user(void *to, const void *from, size_t n)
+ *
+ * Purpose:
+ *
+ * copy a block to user memory from kernel memory
+ *
+ * Params:
+ *
+ * to = user memory
+ * from = kernel memory
+ * n = number of bytes to copy
+ *
+ * Return value:
+ *
+ * Number of bytes NOT copied.
+ */
+
+ .macro ldr1w ptr reg abort
+ ldw.w \reg, [\ptr]+, #4
+ .endm
+
+ .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
+ ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+
+ .endm
+
+ .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+ ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
+ .endm
+
+ .macro ldr1b ptr reg cond=al abort
+ notcond \cond, .+8
+ ldb.w \reg, [\ptr]+, #1
+ .endm
+
+ .macro str1w ptr reg abort
+ strusr \reg, \ptr, 4, abort=\abort
+ .endm
+
+ .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+100: stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
+
+ .pushsection __ex_table, "a"
+ .long 100b, \abort
+ .popsection
+ .endm
+
+ .macro str1b ptr reg cond=al abort
+ strusr \reg, \ptr, 1, \cond, abort=\abort
+ .endm
+
+ .macro enter
+ mov r3, #0
+ stm.w (r0, r2, r3), [sp-]
+ .endm
+
+ .macro exit
+ add sp, sp, #8
+ ldm.w (r0), [sp]+
+ mov pc, lr
+ .endm
+
+ .text
+
+WEAK(__copy_to_user)
+
+#include "copy_template.S"
+
+ENDPROC(__copy_to_user)
+
+ .pushsection .fixup,"ax"
+ .align 0
+ copy_abort_preamble
+ ldm.w (r1, r2, r3), [sp]+
+ sub r0, r0, r1
+ rsub r0, r0, r2
+ copy_abort_end
+ .popsection
+
diff --git a/kernel/arch/unicore32/lib/delay.S b/kernel/arch/unicore32/lib/delay.S
new file mode 100644
index 000000000..24664c009
--- /dev/null
+++ b/kernel/arch/unicore32/lib/delay.S
@@ -0,0 +1,51 @@
+/*
+ * linux/arch/unicore32/lib/delay.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/param.h>
+ .text
+
+.LC0: .word loops_per_jiffy
+.LC1: .word (2199023*HZ)>>11
+
+/*
+ * r0 <= 2000
+ * lpj <= 0x01ffffff (max. 3355 bogomips)
+ * HZ <= 1000
+ */
+
+ENTRY(__udelay)
+ ldw r2, .LC1
+ mul r0, r2, r0
+ENTRY(__const_udelay) @ 0 <= r0 <= 0x7fffff06
+ ldw r2, .LC0
+ ldw r2, [r2] @ max = 0x01ffffff
+ mov r0, r0 >> #14 @ max = 0x0001ffff
+ mov r2, r2 >> #10 @ max = 0x00007fff
+ mul r0, r2, r0 @ max = 2^32-1
+ mov.a r0, r0 >> #6
+ cmoveq pc, lr
+
+/*
+ * loops = r0 * HZ * loops_per_jiffy / 1000000
+ *
+ * Oh, if only we had a cycle counter...
+ */
+
+@ Delay routine
+ENTRY(__delay)
+ sub.a r0, r0, #2
+ bua __delay
+ mov pc, lr
+ENDPROC(__udelay)
+ENDPROC(__const_udelay)
+ENDPROC(__delay)
diff --git a/kernel/arch/unicore32/lib/findbit.S b/kernel/arch/unicore32/lib/findbit.S
new file mode 100644
index 000000000..c77746247
--- /dev/null
+++ b/kernel/arch/unicore32/lib/findbit.S
@@ -0,0 +1,100 @@
+/*
+ * linux/arch/unicore32/lib/findbit.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+ .text
+
+/*
+ * Purpose : Find a 'zero' bit
+ * Prototype: int find_first_zero_bit(void *addr, unsigned int maxbit);
+ */
+ENTRY(find_first_zero_bit)
+ cxor.a r1, #0
+ beq 3f
+ mov r2, #0
+1: ldb r3, [r0+], r2 >> #3
+ xor.a r3, r3, #0xff @ invert bits
+ bne .L_found @ any now set - found zero bit
+ add r2, r2, #8 @ next bit pointer
+2: csub.a r2, r1 @ any more?
+ bub 1b
+3: mov r0, r1 @ no free bits
+ mov pc, lr
+ENDPROC(find_first_zero_bit)
+
+/*
+ * Purpose : Find next 'zero' bit
+ * Prototype: int find_next_zero_bit
+ * (void *addr, unsigned int maxbit, int offset)
+ */
+ENTRY(find_next_zero_bit)
+ cxor.a r1, #0
+ beq 3b
+ and.a ip, r2, #7
+ beq 1b @ If new byte, goto old routine
+ ldb r3, [r0+], r2 >> #3
+ xor r3, r3, #0xff @ now looking for a 1 bit
+ mov.a r3, r3 >> ip @ shift off unused bits
+ bne .L_found
+ or r2, r2, #7 @ if zero, then no bits here
+ add r2, r2, #1 @ align bit pointer
+ b 2b @ loop for next bit
+ENDPROC(find_next_zero_bit)
+
+/*
+ * Purpose : Find a 'one' bit
+ * Prototype: int find_first_bit
+ * (const unsigned long *addr, unsigned int maxbit);
+ */
+ENTRY(find_first_bit)
+ cxor.a r1, #0
+ beq 3f
+ mov r2, #0
+1: ldb r3, [r0+], r2 >> #3
+ mov.a r3, r3
+ bne .L_found @ any now set - found zero bit
+ add r2, r2, #8 @ next bit pointer
+2: csub.a r2, r1 @ any more?
+ bub 1b
+3: mov r0, r1 @ no free bits
+ mov pc, lr
+ENDPROC(find_first_bit)
+
+/*
+ * Purpose : Find next 'one' bit
+ * Prototype: int find_next_zero_bit
+ * (void *addr, unsigned int maxbit, int offset)
+ */
+ENTRY(find_next_bit)
+ cxor.a r1, #0
+ beq 3b
+ and.a ip, r2, #7
+ beq 1b @ If new byte, goto old routine
+ ldb r3, [r0+], r2 >> #3
+ mov.a r3, r3 >> ip @ shift off unused bits
+ bne .L_found
+ or r2, r2, #7 @ if zero, then no bits here
+ add r2, r2, #1 @ align bit pointer
+ b 2b @ loop for next bit
+ENDPROC(find_next_bit)
+
+/*
+ * One or more bits in the LSB of r3 are assumed to be set.
+ */
+.L_found:
+ rsub r1, r3, #0
+ and r3, r3, r1
+ cntlz r3, r3
+ rsub r3, r3, #31
+ add r0, r2, r3
+ mov pc, lr
+
diff --git a/kernel/arch/unicore32/lib/strncpy_from_user.S b/kernel/arch/unicore32/lib/strncpy_from_user.S
new file mode 100644
index 000000000..ff6c304d5
--- /dev/null
+++ b/kernel/arch/unicore32/lib/strncpy_from_user.S
@@ -0,0 +1,45 @@
+/*
+ * linux/arch/unicore32/lib/strncpy_from_user.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+ .text
+ .align 5
+
+/*
+ * Copy a string from user space to kernel space.
+ * r0 = dst, r1 = src, r2 = byte length
+ * returns the number of characters copied (strlen of copied string),
+ * -EFAULT on exception, or "len" if we fill the whole buffer
+ */
+ENTRY(__strncpy_from_user)
+ mov ip, r1
+1: sub.a r2, r2, #1
+ ldrusr r3, r1, 1, ns
+ bfs 2f
+ stb.w r3, [r0]+, #1
+ cxor.a r3, #0
+ bne 1b
+ sub r1, r1, #1 @ take NUL character out of count
+2: sub r0, r1, ip
+ mov pc, lr
+ENDPROC(__strncpy_from_user)
+
+ .pushsection .fixup,"ax"
+ .align 0
+9001: mov r3, #0
+ stb r3, [r0+], #0 @ null terminate
+ mov r0, #-EFAULT
+ mov pc, lr
+ .popsection
+
diff --git a/kernel/arch/unicore32/lib/strnlen_user.S b/kernel/arch/unicore32/lib/strnlen_user.S
new file mode 100644
index 000000000..75863030f
--- /dev/null
+++ b/kernel/arch/unicore32/lib/strnlen_user.S
@@ -0,0 +1,42 @@
+/*
+ * linux/arch/unicore32/lib/strnlen_user.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+ .text
+ .align 5
+
+/* Prototype: unsigned long __strnlen_user(const char *str, long n)
+ * Purpose : get length of a string in user memory
+ * Params : str - address of string in user memory
+ * Returns : length of string *including terminator*
+ * or zero on exception, or n + 1 if too long
+ */
+ENTRY(__strnlen_user)
+ mov r2, r0
+1:
+ ldrusr r3, r0, 1
+ cxor.a r3, #0
+ beq 2f
+ sub.a r1, r1, #1
+ bne 1b
+ add r0, r0, #1
+2: sub r0, r0, r2
+ mov pc, lr
+ENDPROC(__strnlen_user)
+
+ .pushsection .fixup,"ax"
+ .align 0
+9001: mov r0, #0
+ mov pc, lr
+ .popsection