Subversion Repositories HelenOS

Rev

Rev 3672 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
3549 rimsky 1 
/*
2 
 * Copyright (c) 2006 Ondrej Palkovsky
3 
 * Copyright (c) 2008 Martin Decky
4 
 * Copyright (c) 2008 Pavel Rimsky
5 
 * All rights reserved.
6 
 *
7 
 * Redistribution and use in source and binary forms, with or without
8 
 * modification, are permitted provided that the following conditions
9 
 * are met:
10 
 *
11 
 * - Redistributions of source code must retain the above copyright
12 
 *   notice, this list of conditions and the following disclaimer.
13 
 * - 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 
 * - The name of the author may not be used to endorse or promote products
17 
 *   derived from this software without specific prior written permission.
18 
 *
19 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 
 */
30 
 
31 
/** @defgroup sgcnfb SGCN
32 
 * @brief   userland driver of the Serengeti console output
33 
 * @{
34 
 */
35 
/** @file
36 
 */
37 
 
38 
#include <async.h>
39 
#include <sysinfo.h>
40 
#include <as.h>
41 
#include <errno.h>
42 
#include <stdio.h>
43 
#include <ddi.h>
44 
 
3582 rimsky 45 
#include "serial_console.h"
3549 rimsky 46 
#include "sgcn.h"
47 
 
48 
#define WIDTH 80
49 
#define HEIGHT 24
50 
 
51 
/**
52 
 * Virtual address mapped to SRAM.
53 
 */
54 
static uintptr_t sram_virt_addr;
55 
 
56 
/**
57 
 * SGCN buffer offset within SGCN.
58 
 */
59 
static uintptr_t sram_buffer_offset;
60 
 
61 
/**
62 
 * SGCN buffer header. It is placed at the very beginning of the SGCN
63 
 * buffer.
64 
 */
65 
typedef struct {
66 
    /** hard-wired to "CON" */
67 
    char magic[4];
68 
 
69 
    /** we don't need this */
3582 rimsky 70 
    char unused[24];
3549 rimsky 71 
 
72 
    /** offset within the SGCN buffer of the output buffer start */
73 
    uint32_t out_begin;
74 
 
75 
    /** offset within the SGCN buffer of the output buffer end */
76 
    uint32_t out_end;
77 
 
78 
    /** offset within the SGCN buffer of the output buffer read pointer */
79 
    uint32_t out_rdptr;
80 
 
81 
    /** offset within the SGCN buffer of the output buffer write pointer */
82 
    uint32_t out_wrptr;
83 
} __attribute__ ((packed)) sgcn_buffer_header_t;
84 
 
85 
 
86 
/*
87 
 * Returns a pointer to the object of a given type which is placed at the given
88 
 * offset from the console buffer beginning.
89 
 */
90 
#define SGCN_BUFFER(type, offset) \
91 
        ((type *) (sram_virt_addr + sram_buffer_offset + (offset)))
92 
 
93 
/** Returns a pointer to the console buffer header. */
94 
#define SGCN_BUFFER_HEADER  (SGCN_BUFFER(sgcn_buffer_header_t, 0))
95 
 
3618 rimsky 96 
/**
97 
 * Pushes the character to the SGCN serial.
98 
 * @param c character to be pushed
99 
 */
3549 rimsky 100 
static void sgcn_putc(char c)
101 
{
102 
    uint32_t begin = SGCN_BUFFER_HEADER->out_begin;
103 
    uint32_t end = SGCN_BUFFER_HEADER->out_end;
104 
    uint32_t size = end - begin;
105 
 
106 
    /* we need pointers to volatile variables */
107 
    volatile char *buf_ptr = (volatile char *)
108 
        SGCN_BUFFER(char, SGCN_BUFFER_HEADER->out_wrptr);
109 
    volatile uint32_t *out_wrptr_ptr = &(SGCN_BUFFER_HEADER->out_wrptr);
110 
    volatile uint32_t *out_rdptr_ptr = &(SGCN_BUFFER_HEADER->out_rdptr);
111 
 
112 
    uint32_t new_wrptr = (((*out_wrptr_ptr) - begin + 1) % size) + begin;
113 
    while (*out_rdptr_ptr == new_wrptr)
114 
        ;
115 
    *buf_ptr = c;
116 
    *out_wrptr_ptr = new_wrptr;
117 
}
118 
 
3618 rimsky 119 
/**
120 
 * Initializes the SGCN serial driver.
121 
 */
3549 rimsky 122 
int sgcn_init(void)
123 
{
3618 rimsky 124 
    sram_virt_addr = (uintptr_t) as_get_mappable_page(
125 
        sysinfo_value("sram.area.size"));
3549 rimsky 126 
    int result = physmem_map(
127 
        (void *) sysinfo_value("sram.address.physical"),
128 
        (void *) sram_virt_addr,
129 
        sysinfo_value("sram.area.size") / PAGE_SIZE,
130 
        AS_AREA_READ | AS_AREA_WRITE
131 
        );
132 
    if (result != 0) {
133 
        printf("SGCN: uspace driver couldn't map physical memory: %d\n",
134 
            result);
135 
    }
136 
 
3582 rimsky 137 
    serial_console_init(sgcn_putc, WIDTH, HEIGHT);
138 
 
3549 rimsky 139 
    sram_buffer_offset = sysinfo_value("sram.buffer.offset");
140 
 
3716 svoboda 141 
    async_set_client_connection(serial_client_connection);
3549 rimsky 142 
    return 0;
143 
}
144 
 
145 
/**
146 
 * @}
147 
 */
3618 rimsky 148