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Annotation of Gnu-Mach/chips/frc.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1993,1992 Carnegie Mellon University
        !             4:  * All Rights Reserved.
        !             5:  * 
        !             6:  * Permission to use, copy, modify and distribute this software and its
        !             7:  * documentation is hereby granted, provided that both the copyright
        !             8:  * notice and this permission notice appear in all copies of the
        !             9:  * software, derivative works or modified versions, and any portions
        !            10:  * thereof, and that both notices appear in supporting documentation.
        !            11:  * 
        !            12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            15:  * 
        !            16:  * Carnegie Mellon requests users of this software to return to
        !            17:  * 
        !            18:  *  Software Distribution Coordinator  or  [email protected]
        !            19:  *  School of Computer Science
        !            20:  *  Carnegie Mellon University
        !            21:  *  Pittsburgh PA 15213-3890
        !            22:  * 
        !            23:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            24:  * the rights to redistribute these changes.
        !            25:  */
        !            26: /*
        !            27:  *     File: frc.c
        !            28:  *     Author: Alessandro Forin, Carnegie Mellon University
        !            29:  *     Date:   3/92
        !            30:  *
        !            31:  *     Generic, mappable free running counter driver.
        !            32:  */
        !            33: 
        !            34: #include <frc.h>
        !            35: #if    NFRC > 0
        !            36: 
        !            37: #include <mach/std_types.h>
        !            38: #include <chips/busses.h>
        !            39: #include <device/device_types.h>
        !            40: 
        !            41: /*
        !            42:  * Machine defines
        !            43:  * All you need to do to get this working on a
        !            44:  * random box is to define one macro and provide
        !            45:  * the correct virtual address.
        !            46:  */
        !            47: #include       <platforms.h>
        !            48: #ifdef DECSTATION
        !            49: #define        btop(x)         mips_btop(x)
        !            50: #endif /* DECSTATION */
        !            51: 
        !            52: /*
        !            53:  * Autoconf info
        !            54:  */
        !            55: 
        !            56: static vm_offset_t frc_std[NFRC] = { 0 };
        !            57: static vm_size_t frc_offset[NFRC] = { 0 };
        !            58: static struct bus_device *frc_info[NFRC];
        !            59: static int frc_probe(vm_offset_t,struct bus_ctlr *);
        !            60: static void frc_attach(struct bus_device *);
        !            61: 
        !            62: struct bus_driver frc_driver =
        !            63:        { frc_probe, 0, frc_attach, 0, frc_std, "frc", frc_info, };
        !            64: 
        !            65: /*
        !            66:  * Externally visible functions
        !            67:  */
        !            68: io_return_t    frc_openclose(int,int);                 /* user */
        !            69: vm_offset_t    frc_mmap(int,vm_offset_t,vm_prot_t);
        !            70: void           frc_set_address(int,vm_size_t);
        !            71: 
        !            72: /*
        !            73:  * FRC's in kernel virtual memory.  For in-kernel timestamps.
        !            74:  */
        !            75: vm_offset_t frc_address[NFRC];
        !            76: 
        !            77: /* machine-specific setups */
        !            78: void
        !            79: frc_set_address(
        !            80:        int             unit,
        !            81:        vm_size_t       offset)
        !            82: {
        !            83:        if (unit < NFRC) {
        !            84:                frc_offset[unit] =  offset;
        !            85:        }
        !            86: }
        !            87: 
        !            88: 
        !            89: /*
        !            90:  * Probe chip to see if it is there
        !            91:  */
        !            92: static frc_probe (
        !            93:        vm_offset_t     reg,
        !            94:        struct bus_ctlr *ui)
        !            95: {
        !            96:        /* see if something present at the given address */
        !            97:        if (check_memory(reg, 0)) {
        !            98:                frc_address[ui->unit] = 0;
        !            99:                return 0;
        !           100:        }
        !           101:        frc_std[ui->unit] = (vm_offset_t) reg;
        !           102:        printf("[mappable] ");
        !           103:        return 1;
        !           104: }
        !           105: 
        !           106: static void
        !           107: frc_attach (
        !           108:                   struct bus_device *ui)
        !           109: {
        !           110:        if (ui->unit < NFRC) {
        !           111:                frc_address[ui->unit] =
        !           112:                        (vm_offset_t) frc_std[ui->unit] + frc_offset[ui->unit];
        !           113:                printf(": free running counter %d at kernel vaddr 0x%x",
        !           114:                       ui->unit, frc_address[ui->unit]);
        !           115:        }
        !           116:        else
        !           117:                panic("frc: unknown unit number"); /* shouldn't happen */
        !           118: }
        !           119: 
        !           120: int frc_intr()
        !           121: {
        !           122:        /* we do not expect interrupts */
        !           123:        panic("frc_intr");
        !           124: }
        !           125: 
        !           126: io_return_t
        !           127: frc_openclose(
        !           128:              int dev, 
        !           129:              int flag)
        !           130: {
        !           131:   if (frc_std[dev])
        !           132:     return D_SUCCESS;
        !           133:   else
        !           134:     return D_NO_SUCH_DEVICE;
        !           135: }
        !           136: 
        !           137: vm_offset_t
        !           138: frc_mmap(
        !           139:        int             dev,
        !           140:        vm_offset_t     off,
        !           141:        vm_prot_t       prot)
        !           142: {
        !           143:        vm_offset_t addr;
        !           144:        if ((prot & VM_PROT_WRITE) || (off >= PAGE_SIZE) )
        !           145:                return (-1);
        !           146:        addr = (vm_offset_t) frc_std[dev] + frc_offset[dev];
        !           147:        return btop(pmap_extract(pmap_kernel(), addr));
        !           148: }
        !           149: 
        !           150: #endif

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