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  1. /*
  2.  * Copyright (C) 2005 Martin Decky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include "ofw.h"
  30. #include "asm.h"
  31. #include "printf.h"
  32.  
  33. #define MAX_OFW_ARGS    10
  34. #define BUF_SIZE        1024
  35.  
  36. typedef unsigned int ofw_arg_t;
  37. typedef unsigned int ihandle;
  38. typedef unsigned int phandle;
  39.  
  40. /** OpenFirmware command structure
  41.  *
  42.  */
  43. typedef struct {
  44.     const char *service;          /**< Command name */
  45.     unsigned int nargs;           /**< Number of in arguments */
  46.     unsigned int nret;            /**< Number of out arguments */
  47.     ofw_arg_t args[MAX_OFW_ARGS]; /**< List of arguments */
  48. } ofw_args_t;
  49.  
  50. typedef void (*ofw_entry)(ofw_args_t *);
  51.  
  52.  
  53. typedef struct {
  54.     unsigned int info;
  55.     unsigned int addr_hi;
  56.     unsigned int addr_lo;
  57. } pci_addr_t;
  58.  
  59. typedef struct {
  60.     pci_addr_t addr;
  61.     unsigned int size_hi;
  62.     unsigned int size_lo;
  63. } pci_reg_t;
  64.  
  65.  
  66. ofw_entry ofw;
  67.  
  68. phandle ofw_chosen;
  69. ihandle ofw_stdout;
  70. phandle ofw_root;
  71. ihandle ofw_mmu;
  72. phandle ofw_memory;
  73. phandle ofw_aliases;
  74.  
  75.  
  76. static int ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets, ...)
  77. {
  78.     va_list list;
  79.     ofw_args_t args;
  80.     int i;
  81.    
  82.     args.service = service;
  83.     args.nargs = nargs;
  84.     args.nret = nret;
  85.    
  86.     va_start(list, rets);
  87.     for (i = 0; i < nargs; i++)
  88.         args.args[i] = va_arg(list, ofw_arg_t);
  89.     va_end(list);
  90.    
  91.     for (i = 0; i < nret; i++)
  92.         args.args[i + nargs] = 0;
  93.    
  94.     ofw(&args);
  95.    
  96.     for (i = 1; i < nret; i++)
  97.         rets[i - 1] = args.args[i + nargs];
  98.    
  99.     return args.args[nargs];
  100. }
  101.  
  102.  
  103. static phandle ofw_find_device(const char *name)
  104. {
  105.     return ofw_call("finddevice", 1, 1, NULL, name);
  106. }
  107.  
  108.  
  109. static int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
  110. {
  111.     return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
  112. }
  113.  
  114.  
  115. static unsigned int ofw_get_address_cells(const phandle device)
  116. {
  117.     unsigned int ret;
  118.    
  119.     if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
  120.         if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
  121.             ret = 1;
  122.    
  123.     return ret;
  124. }
  125.  
  126.  
  127. static unsigned int ofw_get_size_cells(const phandle device)
  128. {
  129.     unsigned int ret;
  130.    
  131.     if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
  132.         if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
  133.             ret = 1;
  134.    
  135.     return ret;
  136. }
  137.  
  138.  
  139. static ihandle ofw_open(const char *name)
  140. {
  141.     return ofw_call("open", 1, 1, NULL, name);
  142. }
  143.  
  144.  
  145. void init(void)
  146. {
  147.     ofw_chosen = ofw_find_device("/chosen");
  148.     if (ofw_chosen == -1)
  149.         halt();
  150.    
  151.     if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)
  152.         ofw_stdout = 0;
  153.    
  154.     ofw_root = ofw_find_device("/");
  155.     if (ofw_root == -1) {
  156.         puts("\r\nError: Unable to find / device, halted.\r\n");
  157.         halt();
  158.     }
  159.    
  160.     if (ofw_get_property(ofw_chosen, "mmu",  &ofw_mmu, sizeof(ofw_mmu)) <= 0) {
  161.         puts("\r\nError: Unable to get mmu property, halted.\r\n");
  162.         halt();
  163.     }
  164.    
  165.     ofw_memory = ofw_find_device("/memory");
  166.     if (ofw_memory == -1) {
  167.         puts("\r\nError: Unable to find /memory device, halted.\r\n");
  168.         halt();
  169.     }
  170.    
  171.     ofw_aliases = ofw_find_device("/aliases");
  172.     if (ofw_aliases == -1) {
  173.         puts("\r\nError: Unable to find /aliases device, halted.\r\n");
  174.         halt();
  175.     }
  176. }
  177.  
  178.  
  179. void ofw_write(const char *str, const int len)
  180. {
  181.     if (ofw_stdout == 0)
  182.         return;
  183.    
  184.     ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
  185. }
  186.  
  187.  
  188. void *ofw_translate(const void *virt)
  189. {
  190.     ofw_arg_t result[3];
  191.    
  192.     if (ofw_call("call-method", 4, 4, result, "translate", ofw_mmu, virt, 1) != 0) {
  193.         puts("Error: MMU method translate() failed, halting.\n");
  194.         halt();
  195.     }
  196.     return (void *) result[2];
  197. }
  198.  
  199.  
  200. int ofw_map(const void *phys, const void *virt, const int size, const int mode)
  201. {
  202.     return ofw_call("call-method", 6, 1, NULL, "map", ofw_mmu, mode, size, virt, phys);
  203. }
  204.  
  205.  
  206. int ofw_memmap(memmap_t *map)
  207. {
  208.     unsigned int buf[BUF_SIZE];
  209.     int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(unsigned int) * BUF_SIZE);
  210.     if (ret <= 0)
  211.         return false;
  212.        
  213.     unsigned int ac = ofw_get_address_cells(ofw_memory);
  214.     unsigned int sc = ofw_get_size_cells(ofw_memory);
  215.    
  216.     int pos;
  217.     map->total = 0;
  218.     map->count = 0;
  219.     for (pos = 0; (pos < ret / sizeof(unsigned int)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
  220.         void * start = (void *) buf[pos + ac - 1];
  221.         unsigned int size = buf[pos + ac + sc - 1];
  222.        
  223.         if (size > 0) {
  224.             map->zones[map->count].start = start;
  225.             map->zones[map->count].size = size;
  226.             map->count++;
  227.             map->total += size;
  228.         }
  229.     }
  230. }
  231.  
  232.  
  233. int ofw_screen(screen_t *screen)
  234. {
  235.     char device_name[BUF_SIZE];
  236.    
  237.     if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(char) * BUF_SIZE) <= 0)
  238.         return false;
  239.    
  240.     phandle device = ofw_find_device(device_name);
  241.     if (device == -1)
  242.         return false;
  243.    
  244.     if (ofw_get_property(device, "address", &screen->addr, sizeof(screen->addr)) <= 0)
  245.         return false;
  246.    
  247.     if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
  248.         return false;
  249.    
  250.     if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
  251.         return false;
  252.    
  253.     if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
  254.         return false;
  255.    
  256.     if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
  257.         return false;
  258.    
  259.     return true;
  260. }
  261.  
  262.  
  263. int ofw_keyboard(keyboard_t *keyboard)
  264. {
  265.     char device_name[BUF_SIZE];
  266.    
  267.     if (ofw_get_property(ofw_aliases, "macio", device_name, sizeof(char) * BUF_SIZE) <= 0)
  268.         return false;
  269.    
  270.     phandle device = ofw_find_device(device_name);
  271.     if (device == -1)
  272.         return false;
  273.    
  274.     pci_reg_t macio;
  275.     if (ofw_get_property(device, "assigned-addresses", &macio, sizeof(macio)) <= 0)
  276.         return false;
  277.    
  278.     keyboard->addr = (void *) macio.addr.addr_lo;
  279.     keyboard->size = macio.size_lo;
  280.    
  281.     return true;
  282. }
  283.