redonkable
/
remarkable-linux
1
0
Fork 0
Code Releases Activity

powerpc/boot: Add extended precision shifts to the boot wrapper. 

The upcomming currituck patches will need to do 64-bit shifts which will
fail with undefined symbol without this patch.

I looked at linking against libgcc but we can't guarantee that libgcc
was compiled with soft-float.  Also Using ../lib/div64.S or
../kernel/misc_32.S, this will break the build as the .o's need to be
built with different flags for the bootwrapper vs the kernel.  So for
now the easyest option is to just copy code from
arch/powerpc/kernel/misc_32.S  I don't think this code changes too often ;P

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Josh Boyer <jwboyer@gmail.com>
wifi-calibration
Tony Breeds 2011-11-30 21:39:21 +00:00 committed by Josh Boyer
parent ca899859f1
commit e32a03290c
1 changed files with 52 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
arch/powerpc/boot/div64.S
View File

@ -57,3 +57,55 @@ __div64_32:
stw r8,4(r3)
mr r3,r6 # return the remainder in r3
blr
/*
* Extended precision shifts.
*
* Updated to be valid for shift counts from 0 to 63 inclusive.
* -- Gabriel
*
* R3/R4 has 64 bit value
* R5 has shift count
* result in R3/R4
*
* ashrdi3: arithmetic right shift (sign propagation)
* lshrdi3: logical right shift
* ashldi3: left shift
*/
.globl __ashrdi3
__ashrdi3:
subfic r6,r5,32
srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count
addi r7,r5,32 # could be xori, or addi with -32
slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count)
rlwinm r8,r7,0,32 # t3 = (count < 32) ? 32 : 0
sraw r7,r3,r7 # t2 = MSW >> (count-32)
or r4,r4,r6 # LSW |= t1
slw r7,r7,r8 # t2 = (count < 32) ? 0 : t2
sraw r3,r3,r5 # MSW = MSW >> count
or r4,r4,r7 # LSW |= t2
blr
.globl __ashldi3
__ashldi3:
subfic r6,r5,32
slw r3,r3,r5 # MSW = count > 31 ? 0 : MSW << count
addi r7,r5,32 # could be xori, or addi with -32
srw r6,r4,r6 # t1 = count > 31 ? 0 : LSW >> (32-count)
slw r7,r4,r7 # t2 = count < 32 ? 0 : LSW << (count-32)
or r3,r3,r6 # MSW |= t1
slw r4,r4,r5 # LSW = LSW << count
or r3,r3,r7 # MSW |= t2
blr
.globl __lshrdi3
__lshrdi3:
subfic r6,r5,32
srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count
addi r7,r5,32 # could be xori, or addi with -32
slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count)
srw r7,r3,r7 # t2 = count < 32 ? 0 : MSW >> (count-32)
or r4,r4,r6 # LSW |= t1
srw r3,r3,r5 # MSW = MSW >> count
or r4,r4,r7 # LSW |= t2
blr