Commit f91a8dcc authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Lennert Buytenhek
Browse files

[ARM] cache align memset and memzero



This is a natural extension following the previous patch.
Non Feroceon based targets are unchanged.
Signed-off-by: default avatarNicolas Pitre <nico@marvell.com>
Signed-off-by: default avatarLennert Buytenhek <buytenh@marvell.com>
parent 2239aff6
......@@ -39,6 +39,9 @@ ENTRY(memset)
mov r3, r1
cmp r2, #16
blt 4f
#if ! CALGN(1)+0
/*
* We need an extra register for this loop - save the return address and
* use the LR
......@@ -64,6 +67,49 @@ ENTRY(memset)
stmneia r0!, {r1, r3, ip, lr}
ldr lr, [sp], #4
#else
/*
* This version aligns the destination pointer in order to write
* whole cache lines at once.
*/
stmfd sp!, {r4-r7, lr}
mov r4, r1
mov r5, r1
mov r6, r1
mov r7, r1
mov ip, r1
mov lr, r1
cmp r2, #96
tstgt r0, #31
ble 3f
and ip, r0, #31
rsb ip, ip, #32
sub r2, r2, ip
movs ip, ip, lsl #(32 - 4)
stmcsia r0!, {r4, r5, r6, r7}
stmmiia r0!, {r4, r5}
tst ip, #(1 << 30)
mov ip, r1
strne r1, [r0], #4
3: subs r2, r2, #64
stmgeia r0!, {r1, r3-r7, ip, lr}
stmgeia r0!, {r1, r3-r7, ip, lr}
bgt 3b
ldmeqfd sp!, {r4-r7, pc}
tst r2, #32
stmneia r0!, {r1, r3-r7, ip, lr}
tst r2, #16
stmneia r0!, {r4-r7}
ldmfd sp!, {r4-r7, lr}
#endif
4: tst r2, #8
stmneia r0!, {r1, r3}
tst r2, #4
......
......@@ -39,6 +39,9 @@ ENTRY(__memzero)
*/
cmp r1, #16 @ 1 we can skip this chunk if we
blt 4f @ 1 have < 16 bytes
#if ! CALGN(1)+0
/*
* We need an extra register for this loop - save the return address and
* use the LR
......@@ -64,6 +67,47 @@ ENTRY(__memzero)
stmneia r0!, {r2, r3, ip, lr} @ 4
ldr lr, [sp], #4 @ 1
#else
/*
* This version aligns the destination pointer in order to write
* whole cache lines at once.
*/
stmfd sp!, {r4-r7, lr}
mov r4, r2
mov r5, r2
mov r6, r2
mov r7, r2
mov ip, r2
mov lr, r2
cmp r1, #96
andgts ip, r0, #31
ble 3f
rsb ip, ip, #32
sub r1, r1, ip
movs ip, ip, lsl #(32 - 4)
stmcsia r0!, {r4, r5, r6, r7}
stmmiia r0!, {r4, r5}
movs ip, ip, lsl #2
strcs r2, [r0], #4
3: subs r1, r1, #64
stmgeia r0!, {r2-r7, ip, lr}
stmgeia r0!, {r2-r7, ip, lr}
bgt 3b
ldmeqfd sp!, {r4-r7, pc}
tst r1, #32
stmneia r0!, {r2-r7, ip, lr}
tst r1, #16
stmneia r0!, {r4-r7}
ldmfd sp!, {r4-r7, lr}
#endif
4: tst r1, #8 @ 1 8 bytes or more?
stmneia r0!, {r2, r3} @ 2
tst r1, #4 @ 1 4 bytes or more?
......
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