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Annotation of sys/arch/arm/mainbus/mainbus_io_asm.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: mainbus_io_asm.S,v 1.1 2004/02/01 05:09:49 drahn Exp $        */
                      2: /*     $NetBSD: mainbus_io_asm.S,v 1.1 2001/02/24 19:38:02 reinoud Exp $       */
                      3:
                      4: /*
                      5:  * Copyright (c) 1997 Mark Brinicombe.
                      6:  * All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by Mark Brinicombe.
                     19:  * 4. The name of the company nor the name of the author may be used to
                     20:  *    endorse or promote products derived from this software without specific
                     21:  *    prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
                     24:  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
                     25:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     26:  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
                     27:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
                     28:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
                     29:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: #include <machine/asm.h>
                     37:
                     38: /*
                     39:  * bus_space I/O functions for mainbus
                     40:  */
                     41:
                     42:
                     43: /*
                     44:  * read single
                     45:  */
                     46:
                     47: ENTRY(mainbus_bs_r_1)
                     48:        ldrb    r0, [r1, r2, lsl #2]
                     49:        mov     pc, lr
                     50:
                     51: ENTRY(mainbus_bs_r_2)
                     52:        ldr     r0, [r1, r2, lsl #2]
                     53:        bic     r0, r0, #0xff000000
                     54:        bic     r0, r0, #0x00ff0000
                     55:        mov     pc, lr
                     56:
                     57: ENTRY(mainbus_bs_r_4)
                     58:        ldr     r0, [r1, r2, lsl #2]
                     59:        mov     pc, lr
                     60:
                     61: /*
                     62:  * write single
                     63:  */
                     64:
                     65: ENTRY(mainbus_bs_w_1)
                     66:        strb    r3, [r1, r2, lsl #2]
                     67:        mov     pc, lr
                     68:
                     69: ENTRY(mainbus_bs_w_2)
                     70:        mov     r3, r3, lsl #16
                     71:        orr     r3, r3, r3, lsr #16
                     72:        str     r3, [r1, r2, lsl #2]
                     73:        mov     pc, lr
                     74:
                     75: ENTRY(mainbus_bs_w_4)
                     76:        str     r3, [r1, r2, lsl #2]
                     77:        mov     pc, lr
                     78:
                     79: /*
                     80:  * read multiple
                     81:  */
                     82:
                     83: ENTRY(mainbus_bs_rm_2)
                     84:        add     r0, r1, r2, lsl #2
                     85:        mov     r1, r3
                     86:        ldr     r2, [sp, #0]
                     87:        b       _C_LABEL(insw16)
                     88:
                     89: /*
                     90:  * write multiple
                     91:  */
                     92:
                     93: ENTRY(mainbus_bs_wm_1)
                     94:        add     r0, r1, r2, lsl #2
                     95:        ldr     r2, [sp, #0]
                     96:
                     97:        /* Make sure that we have a positive length */
                     98:        cmp     r2, #0x00000000
                     99:        movle   pc, lr
                    100:
                    101: mainbus_wm_1_loop:
                    102:        ldrb    r1, [r3], #0x0001
                    103:        str     r1, [r0]
                    104:        subs    r2, r2, #0x00000001
                    105:        bgt     mainbus_wm_1_loop
                    106:
                    107:        mov     pc, lr
                    108:
                    109: ENTRY(mainbus_bs_wm_2)
                    110:        add     r0, r1, r2, lsl #2
                    111:        mov     r1, r3
                    112:        ldr     r2, [sp, #0]
                    113:        b       _C_LABEL(outsw16)