source: soft/giet_vm/giet_drivers/rdk_driver.c @ 378

Last change on this file since 378 was 320, checked in by alain, 10 years ago

All drivers have been modified to use only the information
contained in the hard_config.h file

File size: 4.1 KB
Line 
1///////////////////////////////////////////////////////////////////////////////////
2// File      : rdk_driver.c
3// Date      : 13/02/2014
4// Author    : alain greiner
5// Maintainer: cesar fuguet
6// Copyright (c) UPMC-LIP6
7///////////////////////////////////////////////////////////////////////////////////
8// The rdk_driver.c and rdk_driver.h files are part ot the GIET-VM kernel.
9//
10// This driver supports a virtual disk implemented as a memory segment,
11// in the address space.
12//
13// The _rdk_read() and _rdk_write() blocking functions use a software memcpy,
14// whatever the selected mode. They return only when the transfer is completed.
15// As the number of concurrent accesses is not bounded, these functions
16// don't use the _ioc_lock variable.
17//
18// The SEG_RDK_BASE virtual address must be defined in the hard_config.h
19// file when the USE_RAMDISK flag is set.
20///////////////////////////////////////////////////////////////////////////////////
21
22#include <giet_config.h>
23#include <hard_config.h>
24#include <rdk_driver.h>
25#include <utils.h>
26#include <tty_driver.h>
27#include <ctx_handler.h>
28
29#if !defined(SEG_RDK_BASE)
30# error: You must define SEG_RDK_BASE in the hard_config.h file
31#endif
32
33///////////////////////////////////////////////////////////////////////////////
34//       _rdk_init()
35// This function does nothing, and return 0 for success.
36///////////////////////////////////////////////////////////////////////////////
37unsigned int _rdk_init( unsigned int channel )
38{
39    return 0;
40}
41
42///////////////////////////////////////////////////////////////////////////////
43//     _rdk_read()
44// Transfer data from the RAMDISK to a memory buffer.
45// - mode     : BOOT / KERNEL / USER
46// - lba      : first block index on the block device
47// - buffer   : virtual base address of the memory buffer
48// - count    : number of blocks to be transfered.
49// Returns 0 if success, > 0 if error.
50///////////////////////////////////////////////////////////////////////////////
51unsigned int _rdk_read( unsigned int lba, 
52                        unsigned int buffer, 
53                        unsigned int count) 
54{
55
56#if GIET_DEBUG_IOC_DRIVER
57_printf("\n[IOC DEBUG] Enter _rdk_read() at cycle %d"
58        "\n - vaddr   = %x"
59        "\n - sectors = %d"
60        "\n - lba     = %x",
61        _get_proctime(), buffer, count, lba );
62#endif
63
64#if USE_RAM_DISK
65    char* src = (char*)SEG_RDK_BASE + (512*lba);
66    char* dst = (char*)buffer;
67    _memcpy( dst, src, count*512 );
68    return 0;
69#else
70    _printf("[GIET ERROR] _rdk_read() should not be used if USE_RAM_DISK not set\n");
71    return 1;
72#endif
73}
74
75///////////////////////////////////////////////////////////////////////////////
76//     _rdk_write()
77// Transfer data from a memory buffer to the block device.
78// - mode     : BOOT / KERNEL / USER
79// - lba      : first block index on the block device
80// - buffer   : virtual base address of the memory buffer
81// - count    : number of blocks to be transfered.
82// Returns 0 if success, > 0 if error.
83///////////////////////////////////////////////////////////////////////////////
84unsigned int _rdk_write( unsigned int lba, 
85                         unsigned int buffer, 
86                         unsigned int count ) 
87{
88
89#if GIET_DEBUG_IOC_DRIVER
90_printf("\n[IOC DEBUG] Enter _rdk_write() at cycle %d"
91        "\n - vaddr   = %x"
92        "\n - sectors = %d"
93        "\n - lba     = %x",
94        _get_proctime(), buffer, count, lba );
95#endif
96
97#if USE_RAM_DISK
98    char* dst = (char*)SEG_RDK_BASE + (512*lba);
99    char* src = (char*)buffer;
100    _memcpy( dst, src, count*512 );
101    return 0;
102#else
103    _printf("[GIET ERROR] _rdk_write() should not be used if USE_RAM_DISK not set\n");
104    return 1;
105#endif
106}
107
108///////////////////////////////////////////////////////////////////////////////
109//     _rdk_get_block_size()
110// This function returns the block_size.
111///////////////////////////////////////////////////////////////////////////////
112unsigned int _rdk_get_block_size() 
113{
114    return 512;
115}
116
117
118// Local Variables:
119// tab-width: 4
120// c-basic-offset: 4
121// c-file-offsets:((innamespace . 0)(inline-open . 0))
122// indent-tabs-mode: nil
123// End:
124// vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4
125
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