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#include <machine/asm.h>
/*
* a0: source address
* a1: length of the area to checksum
* a2: partial checksum
* a3: dst
*/
#define src a0
#define dst a3
#define sum v0
.text
.set noreorder
.macro CSUM_BIGCHUNK_AND_COPY offset
pref 0, (\offset+0x0)(a0)
ld t0, (\offset+0x00)(a0)
ld t1, (\offset+0x08)(a0)
.word 0x70481038 /*daddwc v0, v0, t0 */
.word 0x70491038 /*daddwc v0, v0, t1 */
ld t0, (\offset + 0x10)(a0)
ld t1, (\offset + 0x18)(a0)
.word 0x70481038 /* daddwc v0, v0, t0 */
.word 0x70491038 /*daddwc v0, v0, t1 */
.endm
small_csumcpy: /* unknown src alignment and < 8 bytes to go */
move a1, t2
andi t0, a1, 4
beqz t0, 1f
andi t0, a1, 2
ulw t1, (src) /* Still a full word to go */
daddiu src, 4
.word 0x70491038 /*daddwc v0, v0, t1 */
1: move t1, zero
beqz t0, 1f
andi t0, a1, 1
ulhu t1, (src) /* Still a halfword to go */
daddiu src, 2
1: beqz t0, 1f
sll t1, t1, 16
lbu t2, (src)
nop
#ifdef __MIPSEB__
sll t2, t2, 8
#endif
or t1, t2
1: .word 0x70491038 /*daddwc v0, v0, t1 */
.word 0x70461038 /*daddwc v0, v0, a2 */
.word 0x70401038 /*daddwc v0, v0, $0 */
/* Ideally at this point of time the status flag must be cleared */
dsll32 v1, sum, 0
.word 0x70431038 /*daddwc v0, v0, v1 */
dsrl32 sum, sum, 0
.word 0x70401038 /*daddwc v0, v0, zero */
/* fold the checksum */
sll v1, sum, 16
addu sum, v1
sltu v1, sum, v1
srl sum, sum, 16
addu sum, v1
1:
.set reorder
jr ra
.set noreorder
/* ------------------------------------------------------------------ */
.align 5
LEAF(xlr_csum_partial_nocopy)
move sum, zero
move t7, zero
sltiu t8, a1, 0x8
bnez t8, small_csumcpy /* < 8 bytes to copy */
move t2, a1
beqz a1, out
andi t7, src, 0x1 /* odd buffer? */
hword_align:
beqz t7, word_align
andi t8, src, 0x2
lbu t0, (src)
dsubu a1, a1, 0x1
.word 0x70481038 /*daddwc v0, v0, t0 */
daddu src, src, 0x1
andi t8, src, 0x2
word_align:
beqz t8, dword_align
sltiu t8, a1, 56
lhu t0, (src)
dsubu a1, a1, 0x2
.word 0x70481038 /*daddwc v0, v0, t0 */
sltiu t8, a1, 56
daddu src, src, 0x2
dword_align:
bnez t8, do_end_words
move t8, a1
andi t8, src, 0x4
beqz t8, qword_align
andi t8, src, 0x8
lw t0, 0x00(src)
dsubu a1, a1, 0x4
.word 0x70481038 /*daddwc v0, v0, t0 */
daddu src, src, 0x4
andi t8, src, 0x8
qword_align:
beqz t8, oword_align
andi t8, src, 0x10
ld t0, 0x00(src)
dsubu a1, a1, 0x8
.word 0x70481038 /*daddwc v0, v0, t0 */
daddu src, src, 0x8
andi t8, src, 0x10
oword_align:
beqz t8, begin_movement
dsrl t8, a1, 0x7
ld t3, 0x08(src)
ld t0, 0x00(src)
.word 0x704b1038 /*daddwc v0, v0, t3 */
.word 0x70481038 /*daddwc v0, v0, t0 */
dsubu a1, a1, 0x10
daddu src, src, 0x10
dsrl t8, a1, 0x7
begin_movement:
beqz t8, 1f
andi t2, a1, 0x40
move_128bytes:
pref 0, 0x20(a0)
pref 0, 0x40(a0)
pref 0, 0x60(a0)
CSUM_BIGCHUNK_AND_COPY(0x00)
CSUM_BIGCHUNK_AND_COPY(0x20)
CSUM_BIGCHUNK_AND_COPY(0x40)
CSUM_BIGCHUNK_AND_COPY(0x60)
dsubu t8, t8, 0x01
bnez t8, move_128bytes /* flag */
daddu src, src, 0x80
1:
beqz t2, 1f
andi t2, a1, 0x20
move_64bytes:
pref 0, 0x20(a0)
pref 0, 0x40(a0)
CSUM_BIGCHUNK_AND_COPY(0x00)
CSUM_BIGCHUNK_AND_COPY(0x20)
daddu src, src, 0x40
1:
beqz t2, do_end_words
andi t8, a1, 0x1c
move_32bytes:
pref 0, 0x20(a0)
CSUM_BIGCHUNK_AND_COPY(0x00)
andi t8, a1, 0x1c
daddu src, src, 0x20
do_end_words:
beqz t8, maybe_end_cruft
dsrl t8, t8, 0x2
end_words:
lw t0, (src)
dsubu t8, t8, 0x1
.word 0x70481038 /*daddwc v0, v0, t0 */
bnez t8, end_words
daddu src, src, 0x4
maybe_end_cruft:
andi t2, a1, 0x3
small_memcpy:
j small_csumcpy; move a1, t2
beqz t2, out
move a1, t2
end_bytes:
lb t0, (src)
dsubu a1, a1, 0x1
bnez a2, end_bytes
daddu src, src, 0x1
out:
jr ra
move v0, sum
END(xlr_csum_partial_nocopy)
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