Thank you to anyone who has already donated - your generous donations helped make three months of treatment possible.
My brother Nate continues to fight stage IV Hodgkin's lymphoma. He's just 31, with a wife and baby girl. They have no active income (since he's been unable to return to work), no insurance, and cannot afford the treatment he needs. Nate and his family need your help. Please consider a donation, every dollar helps. Thanks.
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/* Read a number of words from the ATA data port * * Utilises line bursts, assumes there is at least one full line to copy. * * Arguments: * (4,%sp) - buffer address * (8,%sp) - word count * * Register usage: * %a0 - current address * %a1 - end address * %a2 - ata port * %d0 - scratch * %d1 - shift count * %d2-%d6 - read buffers * * %d7 - byte swap scrach register * %a3 - byte swap mask */ copy_read_sectors: lea.l (-32, %sp), %sp movem.l %d2-%d7/%a2-%a3, (%sp) movem.l (36, %sp), %a0-%a1 add.l %a1, %a1 add.l %a0, %a1 lea.l .ata_port, %a2 lea.l .swapmask, %a3 move.l %a0, %d0 btst.l #0, %d0 /* 16-bit aligned? */ jeq .r_aligned /* yes, do word copy */ /* not 16-bit aligned */ subq.l #1, %a1 /* last byte is done unconditionally */ moveq.l #24, %d1 /* preload shift count */ move.w (%a2), %d2 /* load initial word */ move.b %d2, (%a0)+ /* write high byte of it, aligns dest addr */ /* we have byte swapped */ lsr.l #8, %d2 btst.l #1, %d0 /* longword aligned? (testing old d0 value!) */ bne.b .r_end_u_w1 /* yes, skip leading word handling */ swap %d2 /* move initial word up */ move.w (%a2), %d2 /* combine with second word */ /* byte swap d2 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d2, %d7 /* d7 = .B.D */ eor.l %d7, %d2 /* d2 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d2 /* d2 = .A.C */ or.l %d7, %d2 /* d2 = BADC */ move.l %d2, %d3 lsr.l #8, %d3 move.w %d3, (%a0)+ /* write bytes 2 and 3 as word */ .r_end_u_w1: moveq.l #12, %d0 add.l %a0, %d0 and.l #0xFFFFFFF0,%d0 /* d0 == first line bound */ cmp.l %a0, %d0 /* any leading longwords? */ bls.b .r_end_u_l1 /* no: skip loop */ .r_loop_u_l1: move.w (%a2), %d3 /* load first word */ swap %d3 /* move to upper 16 bit */ move.w (%a2), %d3 /* load second word */ /* byte swap d3 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d3, %d7 /* d7 = .B.D */ eor.l %d7, %d3 /* d3 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d3 /* d3 = .A.C */ or.l %d7, %d3 /* d3 = BADC */ move.l %d3, %d4 lsl.l %d1, %d2 lsr.l #8, %d3 or.l %d3, %d2 /* combine old low byte with new top 3 bytes */ move.l %d2, (%a0)+ /* store as long */ move.l %d4, %d2 cmp.l %a0, %d0 /* run up to first line bound */ bhi.b .r_loop_u_l1 .r_end_u_l1: lea.l (-14, %a1), %a1 /* adjust end addr. to 16 bytes/pass */ .r_loop_u_line: move.w (%a2), %d3 /* load 1st word */ swap %d3 /* move to upper 16 bit */ move.w (%a2), %d3 /* load 2nd word */ /* byte swap d3 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d3, %d7 /* d7 = .B.D */ eor.l %d7, %d3 /* d3 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d3 /* d3 = .A.C */ or.l %d7, %d3 /* d3 = BADC */ move.l %d3, %d0 lsl.l %d1, %d2 lsr.l #8, %d0 or.l %d0, %d2 /* combine old low byte with new top 3 bytes */ move.w (%a2), %d4 /* load 3rd word */ swap %d4 /* move to upper 16 bit */ move.w (%a2), %d4 /* load 4th word */ /* byte swap d4 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d4, %d7 /* d7 = .B.D */ eor.l %d7, %d4 /* d4 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d4 /* d4 = .A.C */ or.l %d7, %d4 /* d4 = BADC */ move.l %d4, %d0 lsl.l %d1, %d3 lsr.l #8, %d0 or.l %d0, %d3 /* combine old low byte with new top 3 bytes */ move.w (%a2), %d5 /* load 5th word */ swap %d5 /* move to upper 16 bit */ move.w (%a2), %d5 /* load 6th word */ /* byte swap d5 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d5, %d7 /* d7 = .B.D */ eor.l %d7, %d5 /* d5 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d5 /* d5 = .A.C */ or.l %d7, %d5 /* d5 = BADC */ move.l %d5, %d0 lsl.l %d1, %d4 lsr.l #8, %d0 or.l %d0, %d4 /* combine old low byte with new top 3 bytes */ move.w (%a2), %d6 /* load 7th word */ swap %d6 /* move to upper 16 bit */ move.w (%a2), %d6 /* load 8th word */ /* byte swap d6 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d6, %d7 /* d7 = .B.D */ eor.l %d7, %d6 /* d6 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d6 /* d6 = .A.C */ or.l %d7, %d6 /* d6 = BADC */ move.l %d6, %d0 lsl.l %d1, %d5 lsr.l #8, %d0 or.l %d0, %d5 /* combine old low byte with new top 3 bytes */ movem.l %d2-%d5, (%a0) /* store line */ lea.l (16, %a0), %a0 move.l %d6, %d2 cmp.l %a0, %a1 /* run up to last line bound */ bhi.b .r_loop_u_line lea.l (12, %a1), %a1 /* readjust for longword loop */ cmp.l %a0, %a1 /* any trailing longwords? */ bls.b .r_end_u_l2 /* no: skip loop */ .r_loop_u_l2: move.w (%a2), %d3 /* load first word */ swap %d3 /* move to upper 16 bit */ move.w (%a2), %d3 /* load second word */ /* byte swap d3 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d3, %d7 /* d7 = .B.D */ eor.l %d7, %d3 /* d3 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d3 /* d3 = .A.C */ or.l %d7, %d3 /* d3 = BADC */ move.l %d3, %d4 lsl.l %d1, %d2 lsr.l #8, %d3 or.l %d3, %d2 /* combine old low byte with new top 3 bytes */ move.l %d2, (%a0)+ /* store as long */ move.l %d4, %d2 cmp.l %a0, %a1 /* run up to last long bound */ bhi.b .r_loop_u_l2 .r_end_u_l2: addq.l #2, %a1 /* back to final end address */ cmp.l %a0, %a1 /* one word left? */ bls.b .r_end_u_w2 move.w (%a2), %d3 move.l %d3, %d0 lsl.l #8, %d2 and.l #0xff, %d0 or.l %d0, %d2 move.w %d2, (%a0)+ /* write bytes 2 and 3 as word */ move.l %d3, %d2 lsr.l #8, %d2 .r_end_u_w2: move.b %d2, (%a0)+ /* store final byte */ bra.w .r_exit /* 16-bit aligned */ .r_aligned: btst.l #1, %d0 /* longword aligned? */ beq.b .r_end_a_w1 /* yes, skip leading word handling */ /* copy initial word */ /* initial word has to be swapped */ move.w (%a2), %d7 move.b %d7, (%a0)+ lsr.l #8, %d7 move.b %d7, (%a0)+ .r_end_a_w1: moveq.l #12, %d0 add.l %a0, %d0 and.l #0xFFFFFFF0,%d0 /* d0 == first line bound */ cmp.l %a0, %d0 /* any leading longwords? */ bls.b .r_end_a_l1 /* no: skip loop */ .r_loop_a_l1: move.w (%a2), %d1 /* load first word */ swap %d1 /* move it to upper 16 bits */ move.w (%a2), %d1 /* load second word */ /* byte swap d1 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d1, %d7 /* d7 = .B.D */ eor.l %d7, %d1 /* d1 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d1 /* d1 = .A.C */ or.l %d7, %d1 /* d1 = BADC */ move.l %d1, (%a0)+ /* store as long */ cmp.l %a0, %d0 /* run up to first line bound */ bhi.b .r_loop_a_l1 .r_end_a_l1: lea.l (-14, %a1), %a1 /* adjust end addr. to 16 bytes/pass */ .r_loop_a_line: move.w (%a2), %d0 /* load 1st word */ swap %d0 /* move it to upper 16 bits */ move.w (%a2), %d0 /* load 2nd word */ /* byte swap d0 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d0, %d7 /* d7 = .B.D */ eor.l %d7, %d0 /* d0 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d0 /* d0 = .A.C */ or.l %d7, %d0 /* d0 = BADC */ move.w (%a2), %d1 /* load 3rd word */ swap %d1 /* move it to upper 16 bits */ move.w (%a2), %d1 /* load 4th word */ /* byte swap d1 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d1, %d7 /* d7 = .B.D */ eor.l %d7, %d1 /* d1 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d1 /* d1 = .A.C */ or.l %d7, %d1 /* d1 = BADC */ move.w (%a2), %d2 /* load 5th word */ swap %d2 /* move it to upper 16 bits */ move.w (%a2), %d2 /* load 6th word */ /* byte swap d2 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d2, %d7 /* d7 = .B.D */ eor.l %d7, %d2 /* d2 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d2 /* d2 = .A.C */ or.l %d7, %d2 /* d2 = BADC */ move.w (%a2), %d3 /* load 7th word */ swap %d3 /* move it to upper 16 bits */ move.w (%a2), %d3 /* load 8th word */ /* byte swap d3 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d3, %d7 /* d7 = .B.D */ eor.l %d7, %d3 /* d3 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d3 /* d3 = .A.C */ or.l %d7, %d3 /* d3 = BADC */ movem.l %d0-%d3, (%a0) /* store line */ lea.l (16, %a0), %a0 cmp.l %a0, %a1 /* run up to last line bound */ bhi.b .r_loop_a_line lea.l (12, %a1), %a1 /* readjust for longword loop */ cmp.l %a0, %a1 /* any trailing longwords? */ bls.b .r_end_a_l2 /* no: skip loop */ .r_loop_a_l2: move.w (%a2), %d1 /* read first word */ swap %d1 /* move it to upper 16 bits */ move.w (%a2), %d1 /* read second word */ /* byte swap d1 */ move.l %a3, %d7 /* d7 = 0x00FF00FF */ and.l %d1, %d7 /* d7 = .B.D */ eor.l %d7, %d1 /* d1 = A.C. */ lsl.l #8, %d7 /* d7 = B.D. */ lsr.l #8, %d1 /* d1 = .A.C */ or.l %d7, %d1 /* d1 = BADC */ move.l %d1, (%a0)+ /* store as long */ cmp.l %a0, %a1 /* run up to last long bound */ bhi.b .r_loop_a_l2 .r_end_a_l2: addq.l #2, %a1 /* back to final end address */ cmp.l %a0, %a1 /* one word left? */ bls.b .r_end_a_w2 /* copy final word */ /* final word has to be swapped */ move.w (%a2), %d7 move.b %d7, (%a0)+ lsr.l #8, %d7 move.b %d7, (%a0)+ .r_end_a_w2: .r_exit: movem.l (%sp), %d2-%d7/%a2-%a3 lea.l (32, %sp), %sp rts |
