Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 314 insertions, 0 deletions

diff --git a/arch/arm/lib/lib1funcs.S b/arch/arm/lib/lib1funcs.S
new file mode 100644
index 00000000000..59026029d01
--- /dev/null
+++ b/arch/arm/lib/lib1funcs.S
@@ -0,0 +1,314 @@
+/*
+ * linux/arch/arm/lib/lib1funcs.S: Optimized ARM division routines
+ *
+ * Author: Nicolas Pitre <nico@cam.org>
+ *   - contributed to gcc-3.4 on Sep 30, 2003
+ *   - adapted for the Linux kernel on Oct 2, 2003
+ */
+
+/* Copyright 1995, 1996, 1998, 1999, 2000, 2003 Free Software Foundation, Inc.
+
+This file 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; either version 2, or (at your option) any
+later version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+This file 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.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+
+.macro ARM_DIV_BODY dividend, divisor, result, curbit
+
+#if __LINUX_ARM_ARCH__ >= 5
+
+        clz     \curbit, \divisor
+        clz     \result, \dividend
+        sub     \result, \curbit, \result
+        mov     \curbit, #1
+        mov     \divisor, \divisor, lsl \result
+        mov     \curbit, \curbit, lsl \result
+        mov     \result, #0
+        
+#else
+
+        @ Initially shift the divisor left 3 bits if possible,
+        @ set curbit accordingly.  This allows for curbit to be located
+        @ at the left end of each 4 bit nibbles in the division loop
+        @ to save one loop in most cases.
+        tst     \divisor, #0xe0000000
+        moveq   \divisor, \divisor, lsl #3
+        moveq   \curbit, #8
+        movne   \curbit, #1
+
+        @ Unless the divisor is very big, shift it up in multiples of
+        @ four bits, since this is the amount of unwinding in the main
+        @ division loop.  Continue shifting until the divisor is 
+        @ larger than the dividend.
+1:      cmp     \divisor, #0x10000000
+        cmplo   \divisor, \dividend
+        movlo   \divisor, \divisor, lsl #4
+        movlo   \curbit, \curbit, lsl #4
+        blo     1b
+
+        @ For very big divisors, we must shift it a bit at a time, or
+        @ we will be in danger of overflowing.
+1:      cmp     \divisor, #0x80000000
+        cmplo   \divisor, \dividend
+        movlo   \divisor, \divisor, lsl #1
+        movlo   \curbit, \curbit, lsl #1
+        blo     1b
+
+        mov     \result, #0
+
+#endif
+
+        @ Division loop
+1:      cmp     \dividend, \divisor
+        subhs   \dividend, \dividend, \divisor
+        orrhs   \result,   \result,   \curbit
+        cmp     \dividend, \divisor,  lsr #1
+        subhs   \dividend, \dividend, \divisor, lsr #1
+        orrhs   \result,   \result,   \curbit,  lsr #1
+        cmp     \dividend, \divisor,  lsr #2
+        subhs   \dividend, \dividend, \divisor, lsr #2
+        orrhs   \result,   \result,   \curbit,  lsr #2
+        cmp     \dividend, \divisor,  lsr #3
+        subhs   \dividend, \dividend, \divisor, lsr #3
+        orrhs   \result,   \result,   \curbit,  lsr #3
+        cmp     \dividend, #0                   @ Early termination?
+        movnes  \curbit,   \curbit,  lsr #4     @ No, any more bits to do?
+        movne   \divisor,  \divisor, lsr #4
+        bne     1b
+
+.endm
+
+
+.macro ARM_DIV2_ORDER divisor, order
+
+#if __LINUX_ARM_ARCH__ >= 5
+
+        clz     \order, \divisor
+        rsb     \order, \order, #31
+
+#else
+
+        cmp     \divisor, #(1 << 16)
+        movhs   \divisor, \divisor, lsr #16
+        movhs   \order, #16
+        movlo   \order, #0
+
+        cmp     \divisor, #(1 << 8)
+        movhs   \divisor, \divisor, lsr #8
+        addhs   \order, \order, #8
+
+        cmp     \divisor, #(1 << 4)
+        movhs   \divisor, \divisor, lsr #4
+        addhs   \order, \order, #4
+
+        cmp     \divisor, #(1 << 2)
+        addhi   \order, \order, #3
+        addls   \order, \order, \divisor, lsr #1
+
+#endif
+
+.endm
+
+
+.macro ARM_MOD_BODY dividend, divisor, order, spare
+
+#if __LINUX_ARM_ARCH__ >= 5
+
+        clz     \order, \divisor
+        clz     \spare, \dividend
+        sub     \order, \order, \spare
+        mov     \divisor, \divisor, lsl \order
+
+#else
+
+        mov     \order, #0
+
+        @ Unless the divisor is very big, shift it up in multiples of
+        @ four bits, since this is the amount of unwinding in the main
+        @ division loop.  Continue shifting until the divisor is 
+        @ larger than the dividend.
+1:      cmp     \divisor, #0x10000000
+        cmplo   \divisor, \dividend
+        movlo   \divisor, \divisor, lsl #4
+        addlo   \order, \order, #4
+        blo     1b
+
+        @ For very big divisors, we must shift it a bit at a time, or
+        @ we will be in danger of overflowing.
+1:      cmp     \divisor, #0x80000000
+        cmplo   \divisor, \dividend
+        movlo   \divisor, \divisor, lsl #1
+        addlo   \order, \order, #1
+        blo     1b
+
+#endif
+
+        @ Perform all needed substractions to keep only the reminder.
+        @ Do comparisons in batch of 4 first.
+        subs    \order, \order, #3              @ yes, 3 is intended here
+        blt     2f
+
+1:      cmp     \dividend, \divisor
+        subhs   \dividend, \dividend, \divisor
+        cmp     \dividend, \divisor,  lsr #1
+        subhs   \dividend, \dividend, \divisor, lsr #1
+        cmp     \dividend, \divisor,  lsr #2
+        subhs   \dividend, \dividend, \divisor, lsr #2
+        cmp     \dividend, \divisor,  lsr #3
+        subhs   \dividend, \dividend, \divisor, lsr #3
+        cmp     \dividend, #1
+        mov     \divisor, \divisor, lsr #4
+        subges  \order, \order, #4
+        bge     1b
+
+        tst     \order, #3
+        teqne   \dividend, #0
+        beq     5f
+
+        @ Either 1, 2 or 3 comparison/substractions are left.
+2:      cmn     \order, #2
+        blt     4f
+        beq     3f
+        cmp     \dividend, \divisor
+        subhs   \dividend, \dividend, \divisor
+        mov     \divisor,  \divisor,  lsr #1
+3:      cmp     \dividend, \divisor
+        subhs   \dividend, \dividend, \divisor
+        mov     \divisor,  \divisor,  lsr #1
+4:      cmp     \dividend, \divisor
+        subhs   \dividend, \dividend, \divisor
+5:
+.endm
+
+
+ENTRY(__udivsi3)
+
+        subs    r2, r1, #1
+        moveq   pc, lr
+        bcc     Ldiv0
+        cmp     r0, r1
+        bls     11f
+        tst     r1, r2
+        beq     12f
+
+        ARM_DIV_BODY r0, r1, r2, r3
+
+        mov     r0, r2
+        mov     pc, lr
+
+11:     moveq   r0, #1
+        movne   r0, #0
+        mov     pc, lr
+
+12:     ARM_DIV2_ORDER r1, r2
+
+        mov     r0, r0, lsr r2
+        mov     pc, lr
+
+
+ENTRY(__umodsi3)
+
+        subs    r2, r1, #1                      @ compare divisor with 1
+        bcc     Ldiv0
+        cmpne   r0, r1                          @ compare dividend with divisor
+        moveq   r0, #0
+        tsthi   r1, r2                          @ see if divisor is power of 2
+        andeq   r0, r0, r2
+        movls   pc, lr
+
+        ARM_MOD_BODY r0, r1, r2, r3
+
+        mov     pc, lr
+
+
+ENTRY(__divsi3)
+
+        cmp     r1, #0
+        eor     ip, r0, r1                      @ save the sign of the result.
+        beq     Ldiv0
+        rsbmi   r1, r1, #0                      @ loops below use unsigned.
+        subs    r2, r1, #1                      @ division by 1 or -1 ?
+        beq     10f
+        movs    r3, r0
+        rsbmi   r3, r0, #0                      @ positive dividend value
+        cmp     r3, r1
+        bls     11f
+        tst     r1, r2                          @ divisor is power of 2 ?
+        beq     12f
+
+        ARM_DIV_BODY r3, r1, r0, r2
+
+        cmp     ip, #0
+        rsbmi   r0, r0, #0
+        mov     pc, lr
+
+10:     teq     ip, r0                          @ same sign ?
+        rsbmi   r0, r0, #0
+        mov     pc, lr
+
+11:     movlo   r0, #0
+        moveq   r0, ip, asr #31
+        orreq   r0, r0, #1
+        mov     pc, lr
+
+12:     ARM_DIV2_ORDER r1, r2
+
+        cmp     ip, #0
+        mov     r0, r3, lsr r2
+        rsbmi   r0, r0, #0
+        mov     pc, lr
+
+
+ENTRY(__modsi3)
+
+        cmp     r1, #0
+        beq     Ldiv0
+        rsbmi   r1, r1, #0                      @ loops below use unsigned.
+        movs    ip, r0                          @ preserve sign of dividend
+        rsbmi   r0, r0, #0                      @ if negative make positive
+        subs    r2, r1, #1                      @ compare divisor with 1
+        cmpne   r0, r1                          @ compare dividend with divisor
+        moveq   r0, #0
+        tsthi   r1, r2                          @ see if divisor is power of 2
+        andeq   r0, r0, r2
+        bls     10f
+
+        ARM_MOD_BODY r0, r1, r2, r3
+
+10:     cmp     ip, #0
+        rsbmi   r0, r0, #0
+        mov     pc, lr
+
+
+Ldiv0:
+
+        str     lr, [sp, #-4]!
+        bl      __div0
+        mov     r0, #0                  @ About as wrong as it could be.
+        ldr     pc, [sp], #4
+
+