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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 <printf.h>
  31. #include <asm.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. static int ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets, ...)
  76. {
  77.     va_list list;
  78.     ofw_args_t args;
  79.     int i;
  80.    
  81.     args.service = service;
  82.     args.nargs = nargs;
  83.     args.nret = nret;
  84.    
  85.     va_start(list, rets);
  86.     for (i = 0; i < nargs; i++)
  87.         args.args[i] = va_arg(list, ofw_arg_t);
  88.     va_end(list);
  89.    
  90.     for (i = 0; i < nret; i++)
  91.         args.args[i + nargs] = 0;
  92.    
  93.     ofw(&args);
  94.    
  95.     for (i = 1; i < nret; i++)
  96.         rets[i - 1] = args.args[i + nargs];
  97.    
  98.     return args.args[nargs];
  99. }
  100.  
  101.  
  102. static phandle ofw_find_device(const char *name)
  103. {
  104.     return ofw_call("finddevice", 1, 1, NULL, name);
  105. }
  106.  
  107.  
  108. static int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
  109. {
  110.     return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
  111. }
  112.  
  113.  
  114. static unsigned int ofw_get_address_cells(const phandle device)
  115. {
  116.     unsigned int ret;
  117.    
  118.     if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
  119.         if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
  120.             ret = 1;
  121.    
  122.     return ret;
  123. }
  124.  
  125.  
  126. static unsigned int ofw_get_size_cells(const phandle device)
  127. {
  128.     unsigned int ret;
  129.    
  130.     if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
  131.         if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
  132.             ret = 1;
  133.    
  134.     return ret;
  135. }
  136.  
  137.  
  138. static ihandle ofw_open(const char *name)
  139. {
  140.     return ofw_call("open", 1, 1, NULL, name);
  141. }
  142.  
  143.  
  144. void init(void)
  145. {
  146.     ofw_chosen = ofw_find_device("/chosen");
  147.     if (ofw_chosen == -1)
  148.         halt();
  149.    
  150.     if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)
  151.         ofw_stdout = 0;
  152.    
  153.     ofw_root = ofw_find_device("/");
  154.     if (ofw_root == -1) {
  155.         puts("\r\nError: Unable to find / device, halted.\r\n");
  156.         halt();
  157.     }
  158.    
  159.     if (ofw_get_property(ofw_chosen, "mmu",  &ofw_mmu, sizeof(ofw_mmu)) <= 0) {
  160.         puts("\r\nError: Unable to get mmu property, halted.\r\n");
  161.         halt();
  162.     }
  163.    
  164.     ofw_memory = ofw_find_device("/memory");
  165.     if (ofw_memory == -1) {
  166.         puts("\r\nError: Unable to find /memory device, halted.\r\n");
  167.         halt();
  168.     }
  169.    
  170.     ofw_aliases = ofw_find_device("/aliases");
  171.     if (ofw_aliases == -1) {
  172.         puts("\r\nError: Unable to find /aliases device, halted.\r\n");
  173.         halt();
  174.     }
  175. }
  176.  
  177.  
  178. void ofw_write(const char *str, const int len)
  179. {
  180.     if (ofw_stdout == 0)
  181.         return;
  182.    
  183.     ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
  184. }
  185.  
  186.  
  187. void *ofw_translate(const void *virt)
  188. {
  189.     ofw_arg_t result[3];
  190.    
  191.     if (ofw_call("call-method", 4, 4, result, "translate", ofw_mmu, virt, 1) != 0) {
  192.         puts("Error: MMU method translate() failed, halting.\n");
  193.         halt();
  194.     }
  195.     return (void *) result[2];
  196. }
  197.  
  198.  
  199. int ofw_map(const void *phys, const void *virt, const int size, const int mode)
  200. {
  201.     return ofw_call("call-method", 6, 1, NULL, "map", ofw_mmu, mode, size, virt, phys);
  202. }
  203.  
  204.  
  205. int ofw_memmap(memmap_t *map)
  206. {
  207.     unsigned int buf[BUF_SIZE];
  208.     int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(unsigned int) * BUF_SIZE);
  209.     if (ret <= 0)
  210.         return false;
  211.        
  212.     unsigned int ac = ofw_get_address_cells(ofw_memory);
  213.     unsigned int sc = ofw_get_size_cells(ofw_memory);
  214.    
  215.     int pos;
  216.     map->total = 0;
  217.     map->count = 0;
  218.     for (pos = 0; (pos < ret / sizeof(unsigned int)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
  219.         void * start = (void *) buf[pos + ac - 1];
  220.         unsigned int size = buf[pos + ac + sc - 1];
  221.        
  222.         if (size > 0) {
  223.             map->zones[map->count].start = start;
  224.             map->zones[map->count].size = size;
  225.             map->count++;
  226.             map->total += size;
  227.         }
  228.     }
  229. }
  230.  
  231.  
  232. int ofw_screen(screen_t *screen)
  233. {
  234.     char device_name[BUF_SIZE];
  235.    
  236.     if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(char) * BUF_SIZE) <= 0)
  237.         return false;
  238.    
  239.     phandle device = ofw_find_device(device_name);
  240.     if (device == -1)
  241.         return false;
  242.    
  243.     if (ofw_get_property(device, "address", &screen->addr, sizeof(screen->addr)) <= 0)
  244.         return false;
  245.    
  246.     if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
  247.         return false;
  248.    
  249.     if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
  250.         return false;
  251.    
  252.     if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
  253.         return false;
  254.    
  255.     if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
  256.         return false;
  257.    
  258.     return true;
  259. }
  260.  
  261.  
  262. int ofw_keyboard(keyboard_t *keyboard)
  263. {
  264.     char device_name[BUF_SIZE];
  265.    
  266.     if (ofw_get_property(ofw_aliases, "macio", device_name, sizeof(char) * BUF_SIZE) <= 0)
  267.         return false;
  268.    
  269.     phandle device = ofw_find_device(device_name);
  270.     if (device == -1)
  271.         return false;
  272.    
  273.     pci_reg_t macio;
  274.     if (ofw_get_property(device, "assigned-addresses", &macio, sizeof(macio)) <= 0)
  275.         return false;
  276.    
  277.     keyboard->addr = (void *) macio.addr.addr_lo;
  278.     keyboard->size = macio.size_lo;
  279.    
  280.     return true;
  281. }
  282.