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  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 <ipc/ipc.h>
  40. #include <ipc/fb.h>
  41. #include <sysinfo.h>
  42. #include <as.h>
  43. #include <errno.h>
  44. #include <stdio.h>
  45. #include <ddi.h>
  46.  
  47. #include "serial_console.h"
  48. #include "sgcn.h"
  49.  
  50. #define WIDTH 80
  51. #define HEIGHT 24
  52.  
  53. /**
  54.  * Virtual address mapped to SRAM.
  55.  */
  56. static uintptr_t sram_virt_addr;
  57.  
  58. /**
  59.  * SGCN buffer offset within SGCN.
  60.  */
  61. static uintptr_t sram_buffer_offset;
  62.  
  63. /* Allow only 1 connection */
  64. static int client_connected = 0;
  65.  
  66. /**
  67.  * SGCN buffer header. It is placed at the very beginning of the SGCN
  68.  * buffer.
  69.  */
  70. typedef struct {
  71.     /** hard-wired to "CON" */
  72.     char magic[4];
  73.    
  74.     /** we don't need this */
  75.     char unused[24];
  76.  
  77.     /** offset within the SGCN buffer of the output buffer start */
  78.     uint32_t out_begin;
  79.    
  80.     /** offset within the SGCN buffer of the output buffer end */
  81.     uint32_t out_end;
  82.    
  83.     /** offset within the SGCN buffer of the output buffer read pointer */
  84.     uint32_t out_rdptr;
  85.    
  86.     /** offset within the SGCN buffer of the output buffer write pointer */
  87.     uint32_t out_wrptr;
  88. } __attribute__ ((packed)) sgcn_buffer_header_t;
  89.  
  90.  
  91. /*
  92.  * Returns a pointer to the object of a given type which is placed at the given
  93.  * offset from the console buffer beginning.
  94.  */
  95. #define SGCN_BUFFER(type, offset) \
  96.         ((type *) (sram_virt_addr + sram_buffer_offset + (offset)))
  97.  
  98. /** Returns a pointer to the console buffer header. */
  99. #define SGCN_BUFFER_HEADER  (SGCN_BUFFER(sgcn_buffer_header_t, 0))
  100.  
  101. /**
  102.  * Pushes the character to the SGCN serial.
  103.  * @param c character to be pushed
  104.  */
  105. static void sgcn_putc(char c)
  106. {
  107.     uint32_t begin = SGCN_BUFFER_HEADER->out_begin;
  108.     uint32_t end = SGCN_BUFFER_HEADER->out_end;
  109.     uint32_t size = end - begin;
  110.    
  111.     /* we need pointers to volatile variables */
  112.     volatile char *buf_ptr = (volatile char *)
  113.         SGCN_BUFFER(char, SGCN_BUFFER_HEADER->out_wrptr);
  114.     volatile uint32_t *out_wrptr_ptr = &(SGCN_BUFFER_HEADER->out_wrptr);
  115.     volatile uint32_t *out_rdptr_ptr = &(SGCN_BUFFER_HEADER->out_rdptr);
  116.  
  117.     uint32_t new_wrptr = (((*out_wrptr_ptr) - begin + 1) % size) + begin;
  118.     while (*out_rdptr_ptr == new_wrptr)
  119.         ;
  120.     *buf_ptr = c;
  121.     *out_wrptr_ptr = new_wrptr;
  122. }
  123.  
  124. /**
  125.  * Main function of the thread serving client connections.
  126.  */
  127. static void sgcn_client_connection(ipc_callid_t iid, ipc_call_t *icall)
  128. {
  129.     int retval;
  130.     ipc_callid_t callid;
  131.     ipc_call_t call;
  132.     char c;
  133.     int lastcol = 0;
  134.     int lastrow = 0;
  135.     int newcol;
  136.     int newrow;
  137.     int fgcolor;
  138.     int bgcolor;
  139.     int i;
  140.    
  141.     if (client_connected) {
  142.         ipc_answer_0(iid, ELIMIT);
  143.         return;
  144.     }
  145.    
  146.     client_connected = 1;
  147.     ipc_answer_0(iid, EOK);
  148.    
  149.     /* Clear the terminal, set scrolling region
  150.        to 0 - 24 lines */
  151.     serial_clrscr();
  152.     serial_goto(0, 0);
  153.     serial_puts("\033[0;24r");
  154.    
  155.     while (true) {
  156.         callid = async_get_call(&call);
  157.         switch (IPC_GET_METHOD(call)) {
  158.         case IPC_M_PHONE_HUNGUP:
  159.             client_connected = 0;
  160.             ipc_answer_0(callid, EOK);
  161.             return;
  162.         case FB_PUTCHAR:
  163.             c = IPC_GET_ARG1(call);
  164.             newrow = IPC_GET_ARG2(call);
  165.             newcol = IPC_GET_ARG3(call);
  166.             if ((lastcol != newcol) || (lastrow != newrow))
  167.                 serial_goto(newrow, newcol);
  168.             lastcol = newcol + 1;
  169.             lastrow = newrow;
  170.             sgcn_putc(c);
  171.             retval = 0;
  172.             break;
  173.         case FB_CURSOR_GOTO:
  174.             newrow = IPC_GET_ARG1(call);
  175.             newcol = IPC_GET_ARG2(call);
  176.             serial_goto(newrow, newcol);
  177.             lastrow = newrow;
  178.             lastcol = newcol;
  179.             retval = 0;
  180.             break;
  181.         case FB_GET_CSIZE:
  182.             ipc_answer_2(callid, EOK, HEIGHT, WIDTH);
  183.             continue;
  184.         case FB_CLEAR:
  185.             serial_clrscr();
  186.             retval = 0;
  187.             break;
  188.         case FB_SET_STYLE:
  189.             fgcolor = IPC_GET_ARG1(call);
  190.             bgcolor = IPC_GET_ARG2(call);
  191.             if (fgcolor < bgcolor)
  192.                 serial_set_style(0);
  193.             else
  194.                 serial_set_style(7);
  195.             retval = 0;
  196.             break;
  197.         case FB_SCROLL:
  198.             i = IPC_GET_ARG1(call);
  199.             if ((i > HEIGHT) || (i < -HEIGHT)) {
  200.                 retval = EINVAL;
  201.                 break;
  202.             }
  203.             serial_scroll(i);
  204.             serial_goto(lastrow, lastcol);
  205.             retval = 0;
  206.             break;
  207.         case FB_CURSOR_VISIBILITY:
  208.             if(IPC_GET_ARG1(call))
  209.                 serial_cursor_enable();
  210.             else
  211.                 serial_cursor_disable();
  212.             retval = 0;
  213.             break;
  214.         default:
  215.             retval = ENOENT;
  216.         }
  217.         ipc_answer_0(callid, retval);
  218.     }
  219. }
  220.  
  221. /**
  222.  * Initializes the SGCN serial driver.
  223.  */
  224. int sgcn_init(void)
  225. {
  226.     sram_virt_addr = (uintptr_t) as_get_mappable_page(
  227.         sysinfo_value("sram.area.size"));
  228.     int result = physmem_map(
  229.         (void *) sysinfo_value("sram.address.physical"),
  230.         (void *) sram_virt_addr,
  231.         sysinfo_value("sram.area.size") / PAGE_SIZE,
  232.         AS_AREA_READ | AS_AREA_WRITE
  233.         );
  234.     if (result != 0) {
  235.         printf("SGCN: uspace driver couldn't map physical memory: %d\n",
  236.             result);
  237.     }
  238.    
  239.     serial_console_init(sgcn_putc, WIDTH, HEIGHT);
  240.    
  241.     sram_buffer_offset = sysinfo_value("sram.buffer.offset");
  242.    
  243.     async_set_client_connection(sgcn_client_connection);
  244.     return 0;
  245. }
  246.  
  247. /**
  248.  * @}
  249.  */
  250.  
  251.