| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* -*- mode: asm -*- |
| 2 | * Due to problems while transferring data I've put these routines as assembly |
| 3 | * code. |
| 4 | * Since I'm no PPC assembler guru, the code is just the assembler version of |
| 5 | |
| 6 | int oktag_to_io(long *paddr,long *addr,long len) |
| 7 | { |
| 8 | long *addr2 = addr; |
| 9 | for(len=(len+sizeof(long)-1)/sizeof(long);len--;) |
| 10 | *paddr = *addr2++; |
| 11 | return addr2 - addr; |
| 12 | } |
| 13 | |
| 14 | int oktag_from_io(long *addr,long *paddr,long len) |
| 15 | { |
| 16 | long *addr2 = addr; |
| 17 | for(len=(len+sizeof(long)-1)/sizeof(long);len--;) |
| 18 | *addr2++ = *paddr; |
| 19 | return addr2 - addr; |
| 20 | } |
| 21 | |
| 22 | * assembled using gcc -O2 -S, with two exception catch points where data |
| 23 | * is moved to/from the IO register. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/config.h> |
| 27 | |
| 28 | #ifdef CONFIG_APUS |
| 29 | |
| 30 | .file "oktagon_io.c" |
| 31 | |
| 32 | gcc2_compiled.: |
| 33 | /* |
| 34 | .section ".text" |
| 35 | */ |
| 36 | .align 2 |
| 37 | .globl oktag_to_io |
| 38 | .type oktag_to_io,@function |
| 39 | oktag_to_io: |
| 40 | addi 5,5,3 |
| 41 | srwi 5,5,2 |
| 42 | cmpwi 1,5,0 |
| 43 | mr 9,3 |
| 44 | mr 3,4 |
| 45 | addi 5,5,-1 |
| 46 | bc 12,6,.L3 |
| 47 | .L5: |
| 48 | cmpwi 1,5,0 |
| 49 | lwz 0,0(3) |
| 50 | addi 3,3,4 |
| 51 | addi 5,5,-1 |
| 52 | exp1: stw 0,0(9) |
| 53 | bc 4,6,.L5 |
| 54 | .L3: |
| 55 | ret1: subf 3,4,3 |
| 56 | srawi 3,3,2 |
| 57 | blr |
| 58 | .Lfe1: |
| 59 | .size oktag_to_io,.Lfe1-oktag_to_io |
| 60 | .align 2 |
| 61 | .globl oktag_from_io |
| 62 | .type oktag_from_io,@function |
| 63 | oktag_from_io: |
| 64 | addi 5,5,3 |
| 65 | srwi 5,5,2 |
| 66 | cmpwi 1,5,0 |
| 67 | mr 9,3 |
| 68 | addi 5,5,-1 |
| 69 | bc 12,6,.L9 |
| 70 | .L11: |
| 71 | cmpwi 1,5,0 |
| 72 | exp2: lwz 0,0(4) |
| 73 | addi 5,5,-1 |
| 74 | stw 0,0(3) |
| 75 | addi 3,3,4 |
| 76 | bc 4,6,.L11 |
| 77 | .L9: |
| 78 | ret2: subf 3,9,3 |
| 79 | srawi 3,3,2 |
| 80 | blr |
| 81 | .Lfe2: |
| 82 | .size oktag_from_io,.Lfe2-oktag_from_io |
| 83 | .ident "GCC: (GNU) egcs-2.90.29 980515 (egcs-1.0.3 release)" |
| 84 | |
| 85 | /* |
| 86 | * Exception table. |
| 87 | * Second longword shows where to jump when an exception at the addr the first |
| 88 | * longword is pointing to is caught. |
| 89 | */ |
| 90 | |
| 91 | .section __ex_table,"a" |
| 92 | .align 2 |
| 93 | oktagon_except: |
| 94 | .long exp1,ret1 |
| 95 | .long exp2,ret2 |
| 96 | |
| 97 | #else |
| 98 | |
| 99 | /* |
| 100 | The code which follows is for 680x0 based assembler and is meant for |
| 101 | Linux/m68k. It was created by cross compiling the code using the |
| 102 | instructions given above. I then added the four labels used in the |
| 103 | exception handler table at the bottom of this file. |
| 104 | - Kevin <kcozens@interlog.com> |
| 105 | */ |
| 106 | |
| 107 | #ifdef CONFIG_AMIGA |
| 108 | |
| 109 | .file "oktagon_io.c" |
| 110 | .version "01.01" |
| 111 | gcc2_compiled.: |
| 112 | .text |
| 113 | .align 2 |
| 114 | .globl oktag_to_io |
| 115 | .type oktag_to_io,@function |
| 116 | oktag_to_io: |
| 117 | link.w %a6,#0 |
| 118 | move.l %d2,-(%sp) |
| 119 | move.l 8(%a6),%a1 |
| 120 | move.l 12(%a6),%d1 |
| 121 | move.l %d1,%a0 |
| 122 | move.l 16(%a6),%d0 |
| 123 | addq.l #3,%d0 |
| 124 | lsr.l #2,%d0 |
| 125 | subq.l #1,%d0 |
| 126 | moveq.l #-1,%d2 |
| 127 | cmp.l %d0,%d2 |
| 128 | jbeq .L3 |
| 129 | .L5: |
| 130 | exp1: |
| 131 | move.l (%a0)+,(%a1) |
| 132 | dbra %d0,.L5 |
| 133 | clr.w %d0 |
| 134 | subq.l #1,%d0 |
| 135 | jbcc .L5 |
| 136 | .L3: |
| 137 | ret1: |
| 138 | move.l %a0,%d0 |
| 139 | sub.l %d1,%d0 |
| 140 | asr.l #2,%d0 |
| 141 | move.l -4(%a6),%d2 |
| 142 | unlk %a6 |
| 143 | rts |
| 144 | |
| 145 | .Lfe1: |
| 146 | .size oktag_to_io,.Lfe1-oktag_to_io |
| 147 | .align 2 |
| 148 | .globl oktag_from_io |
| 149 | .type oktag_from_io,@function |
| 150 | oktag_from_io: |
| 151 | link.w %a6,#0 |
| 152 | move.l %d2,-(%sp) |
| 153 | move.l 8(%a6),%d1 |
| 154 | move.l 12(%a6),%a1 |
| 155 | move.l %d1,%a0 |
| 156 | move.l 16(%a6),%d0 |
| 157 | addq.l #3,%d0 |
| 158 | lsr.l #2,%d0 |
| 159 | subq.l #1,%d0 |
| 160 | moveq.l #-1,%d2 |
| 161 | cmp.l %d0,%d2 |
| 162 | jbeq .L9 |
| 163 | .L11: |
| 164 | exp2: |
| 165 | move.l (%a1),(%a0)+ |
| 166 | dbra %d0,.L11 |
| 167 | clr.w %d0 |
| 168 | subq.l #1,%d0 |
| 169 | jbcc .L11 |
| 170 | .L9: |
| 171 | ret2: |
| 172 | move.l %a0,%d0 |
| 173 | sub.l %d1,%d0 |
| 174 | asr.l #2,%d0 |
| 175 | move.l -4(%a6),%d2 |
| 176 | unlk %a6 |
| 177 | rts |
| 178 | .Lfe2: |
| 179 | .size oktag_from_io,.Lfe2-oktag_from_io |
| 180 | .ident "GCC: (GNU) 2.7.2.1" |
| 181 | |
| 182 | /* |
| 183 | * Exception table. |
| 184 | * Second longword shows where to jump when an exception at the addr the first |
| 185 | * longword is pointing to is caught. |
| 186 | */ |
| 187 | |
| 188 | .section __ex_table,"a" |
| 189 | .align 2 |
| 190 | oktagon_except: |
| 191 | .long exp1,ret1 |
| 192 | .long exp2,ret2 |
| 193 | |
| 194 | #endif |
| 195 | #endif |