Rev 4337 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 3674 | svoboda | 1 | /* |
| 2 | * Copyright (c) 2006 Ondrej Palkovsky |
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| 3 | * Copyright (c) 2008 Martin Decky |
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| 4 | * Copyright (c) 2008 Pavel Rimsky |
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| 5 | * All rights reserved. |
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| 6 | * |
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| 7 | * Redistribution and use in source and binary forms, with or without |
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| 8 | * modification, are permitted provided that the following conditions |
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| 9 | * are met: |
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| 10 | * |
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| 11 | * - Redistributions of source code must retain the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer. |
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| 13 | * - Redistributions in binary form must reproduce the above copyright |
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| 14 | * notice, this list of conditions and the following disclaimer in the |
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| 15 | * documentation and/or other materials provided with the distribution. |
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| 16 | * - The name of the author may not be used to endorse or promote products |
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| 17 | * derived from this software without specific prior written permission. |
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| 18 | * |
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 29 | */ |
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| 30 | |||
| 31 | /** @defgroup sgcnfb SGCN |
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| 32 | * @brief userland driver of the Serengeti console output |
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| 33 | * @{ |
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| 34 | */ |
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| 35 | /** @file |
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| 36 | */ |
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| 37 | |||
| 38 | #include <async.h> |
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| 39 | #include <sysinfo.h> |
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| 40 | #include <as.h> |
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| 41 | #include <errno.h> |
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| 42 | #include <stdio.h> |
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| 43 | #include <ddi.h> |
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| 44 | |||
| 45 | #include "serial_console.h" |
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| 46 | #include "sgcn.h" |
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| 47 | |||
| 48 | #define WIDTH 80 |
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| 49 | #define HEIGHT 24 |
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| 50 | |||
| 51 | /** |
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| 52 | * Virtual address mapped to SRAM. |
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| 53 | */ |
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| 54 | static uintptr_t sram_virt_addr; |
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| 55 | |||
| 56 | /** |
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| 57 | * SGCN buffer offset within SGCN. |
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| 58 | */ |
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| 59 | static uintptr_t sram_buffer_offset; |
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| 60 | |||
| 61 | /** |
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| 62 | * SGCN buffer header. It is placed at the very beginning of the SGCN |
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| 63 | * buffer. |
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| 64 | */ |
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| 65 | typedef struct { |
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| 66 | /** hard-wired to "CON" */ |
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| 67 | char magic[4]; |
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| 68 | |||
| 69 | /** we don't need this */ |
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| 70 | char unused[24]; |
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| 71 | |||
| 72 | /** offset within the SGCN buffer of the output buffer start */ |
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| 73 | uint32_t out_begin; |
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| 74 | |||
| 75 | /** offset within the SGCN buffer of the output buffer end */ |
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| 76 | uint32_t out_end; |
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| 77 | |||
| 78 | /** offset within the SGCN buffer of the output buffer read pointer */ |
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| 79 | uint32_t out_rdptr; |
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| 80 | |||
| 81 | /** offset within the SGCN buffer of the output buffer write pointer */ |
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| 82 | uint32_t out_wrptr; |
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| 83 | } __attribute__ ((packed)) sgcn_buffer_header_t; |
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| 84 | |||
| 85 | |||
| 86 | /* |
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| 87 | * Returns a pointer to the object of a given type which is placed at the given |
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| 88 | * offset from the console buffer beginning. |
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| 89 | */ |
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| 90 | #define SGCN_BUFFER(type, offset) \ |
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| 91 | ((type *) (sram_virt_addr + sram_buffer_offset + (offset))) |
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| 92 | |||
| 93 | /** Returns a pointer to the console buffer header. */ |
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| 94 | #define SGCN_BUFFER_HEADER (SGCN_BUFFER(sgcn_buffer_header_t, 0)) |
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| 95 | |||
| 96 | /** |
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| 97 | * Pushes the character to the SGCN serial. |
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| 98 | * @param c character to be pushed |
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| 99 | */ |
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| 100 | static void sgcn_putc(char c) |
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| 101 | { |
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| 102 | uint32_t begin = SGCN_BUFFER_HEADER->out_begin; |
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| 103 | uint32_t end = SGCN_BUFFER_HEADER->out_end; |
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| 104 | uint32_t size = end - begin; |
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| 105 | |||
| 106 | /* we need pointers to volatile variables */ |
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| 107 | volatile char *buf_ptr = (volatile char *) |
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| 108 | SGCN_BUFFER(char, SGCN_BUFFER_HEADER->out_wrptr); |
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| 109 | volatile uint32_t *out_wrptr_ptr = &(SGCN_BUFFER_HEADER->out_wrptr); |
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| 110 | volatile uint32_t *out_rdptr_ptr = &(SGCN_BUFFER_HEADER->out_rdptr); |
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| 111 | |||
| 112 | uint32_t new_wrptr = (((*out_wrptr_ptr) - begin + 1) % size) + begin; |
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| 113 | while (*out_rdptr_ptr == new_wrptr) |
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| 114 | ; |
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| 115 | *buf_ptr = c; |
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| 116 | *out_wrptr_ptr = new_wrptr; |
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| 117 | } |
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| 118 | |||
| 119 | /** |
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| 120 | * Initializes the SGCN serial driver. |
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| 121 | */ |
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| 122 | int sgcn_init(void) |
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| 123 | { |
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| 4343 | svoboda | 124 | sram_virt_addr = (uintptr_t) as_get_mappable_page(sysinfo_value("sram.area.size")); |
| 3674 | svoboda | 125 | |
| 4343 | svoboda | 126 | if (physmem_map((void *) sysinfo_value("sram.address.physical"), |
| 127 | (void *) sram_virt_addr, sysinfo_value("sram.area.size") / PAGE_SIZE, |
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| 128 | AS_AREA_READ | AS_AREA_WRITE) != 0) |
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| 129 | return -1; |
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| 130 | |||
| 3674 | svoboda | 131 | serial_console_init(sgcn_putc, WIDTH, HEIGHT); |
| 132 | |||
| 133 | sram_buffer_offset = sysinfo_value("sram.buffer.offset"); |
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| 134 | |||
| 4337 | svoboda | 135 | async_set_client_connection(serial_client_connection); |
| 3674 | svoboda | 136 | return 0; |
| 137 | } |
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| 138 | |||
| 139 | /** |
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| 140 | * @} |
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| 141 | */ |
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| 142 |