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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 <ofwarch.h>
  31. #include <printf.h>
  32. #include <asm.h>
  33. #include <types.h>
  34.  
  35. uintptr_t ofw_cif;
  36.  
  37. phandle ofw_chosen;
  38. ihandle ofw_stdout;
  39. phandle ofw_root;
  40. ihandle ofw_mmu;
  41. phandle ofw_memory;
  42. phandle ofw_aliases;
  43.  
  44. void ofw_init(void)
  45. {
  46.     ofw_chosen = ofw_find_device("/chosen");
  47.     if (ofw_chosen == -1)
  48.         halt();
  49.    
  50.     if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)
  51.         ofw_stdout = 0;
  52.    
  53.     ofw_root = ofw_find_device("/");
  54.     if (ofw_root == -1) {
  55.         puts("\r\nError: Unable to find / device, halted.\r\n");
  56.         halt();
  57.     }
  58.    
  59.     if (ofw_get_property(ofw_chosen, "mmu",  &ofw_mmu, sizeof(ofw_mmu)) <= 0) {
  60.         puts("\r\nError: Unable to get mmu property, halted.\r\n");
  61.         halt();
  62.     }
  63.  
  64.     ofw_memory = ofw_find_device("/memory");
  65.     if (ofw_memory == -1) {
  66.         puts("\r\nError: Unable to find /memory device, halted.\r\n");
  67.         halt();
  68.     }
  69.    
  70.     ofw_aliases = ofw_find_device("/aliases");
  71.     if (ofw_aliases == -1) {
  72.         puts("\r\nError: Unable to find /aliases device, halted.\r\n");
  73.         halt();
  74.     }
  75. }
  76.  
  77.  
  78. static unsigned long ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets, ...)
  79. {
  80.     va_list list;
  81.     ofw_args_t args;
  82.     int i;
  83.    
  84.     args.service = service;
  85.     args.nargs = nargs;
  86.     args.nret = nret;
  87.    
  88.     va_start(list, rets);
  89.     for (i = 0; i < nargs; i++)
  90.         args.args[i] = va_arg(list, ofw_arg_t);
  91.     va_end(list);
  92.    
  93.     for (i = 0; i < nret; i++)
  94.         args.args[i + nargs] = 0;
  95.    
  96.     (void) ofw(&args);
  97.  
  98.     for (i = 1; i < nret; i++)
  99.         rets[i - 1] = args.args[i + nargs];
  100.  
  101.     return args.args[nargs];
  102. }
  103.  
  104.  
  105. phandle ofw_find_device(const char *name)
  106. {
  107.     return ofw_call("finddevice", 1, 1, NULL, name);
  108. }
  109.  
  110.  
  111. int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
  112. {
  113.     return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
  114. }
  115.  
  116.  
  117. unsigned int ofw_get_address_cells(const phandle device)
  118. {
  119.     unsigned int ret = 1;
  120.    
  121.     if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
  122.         if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
  123.             ret = OFW_ADDRESS_CELLS;
  124.    
  125.     return ret;
  126. }
  127.  
  128.  
  129. unsigned int ofw_get_size_cells(const phandle device)
  130. {
  131.     unsigned int ret;
  132.    
  133.     if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
  134.         if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
  135.             ret = OFW_SIZE_CELLS;
  136.    
  137.     return ret;
  138. }
  139.  
  140.  
  141. static ihandle ofw_open(const char *name)
  142. {
  143.     return ofw_call("open", 1, 1, NULL, name);
  144. }
  145.  
  146.  
  147. void ofw_write(const char *str, const int len)
  148. {
  149.     if (ofw_stdout == 0)
  150.         return;
  151.    
  152.     ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
  153. }
  154.  
  155.  
  156. void *ofw_translate(const void *virt)
  157. {
  158.     ofw_arg_t result[4];
  159.     int shift;
  160.  
  161.     if (ofw_call("call-method", 3, 5, result, "translate", ofw_mmu, virt) != 0) {
  162.         puts("Error: MMU method translate() failed, halting.\n");
  163.         halt();
  164.     }
  165.  
  166.     if (ofw_translate_failed(result[0]))
  167.         return NULL;
  168.  
  169.     if (sizeof(unative_t) == 8)
  170.         shift = 32;
  171.     else
  172.         shift = 0;
  173.  
  174.     return (void *) ((result[2]<<shift)|result[3]);
  175. }
  176.  
  177. void *ofw_claim(const void *virt, const int len)
  178. {
  179.     ofw_arg_t retaddr;
  180.     int shift;
  181.  
  182.     if (ofw_call("call-method", 5, 2, &retaddr, "claim", ofw_mmu, 0, len, virt) != 0) {
  183.         puts("Error: MMU method claim() failed, halting.\n");
  184.         halt();
  185.     }
  186.  
  187.     return (void *) retaddr;
  188. }
  189.  
  190. int ofw_map(const void *phys, const void *virt, const int size, const int mode)
  191. {
  192.     uintptr_t phys_hi, phys_lo;
  193.  
  194.     if (sizeof(unative_t) == 8) {
  195.         int shift = 32;
  196.         phys_hi = (uintptr_t) phys >> shift;
  197.         phys_lo = (uintptr_t) phys & 0xffffffff;
  198.     } else {
  199.         phys_hi = 0;
  200.         phys_lo = (uintptr_t) phys;
  201.     }
  202.  
  203.     return ofw_call("call-method", 7, 1, NULL, "map", ofw_mmu, mode, size, virt,
  204.         phys_hi, phys_lo);
  205. }
  206.  
  207.  
  208. int ofw_memmap(memmap_t *map)
  209. {
  210.     unsigned int ac = ofw_get_address_cells(ofw_memory);
  211.     unsigned int sc = ofw_get_size_cells(ofw_memory);
  212.  
  213.     uint32_t buf[((ac+sc)*MEMMAP_MAX_RECORDS)];
  214.     int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(buf));
  215.     if (ret <= 0)       /* ret is the number of written bytes */
  216.         return false;
  217.  
  218.     int pos;
  219.     map->total = 0;
  220.     map->count = 0;
  221.     for (pos = 0; (pos < ret / sizeof(uint32_t)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
  222.         void * start = (void *) ((uintptr_t) buf[pos + ac - 1]);
  223.         unsigned int size = buf[pos + ac + sc - 1];
  224.        
  225.         if (size > 0) {
  226.             map->zones[map->count].start = start;
  227.             map->zones[map->count].size = size;
  228.             map->count++;
  229.             map->total += size;
  230.         }
  231.     }
  232.    
  233.     return true;
  234. }
  235.  
  236.  
  237. int ofw_screen(screen_t *screen)
  238. {
  239.     char device_name[BUF_SIZE];
  240.     uint32_t virtaddr;
  241.    
  242.     if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(device_name)) <= 0)
  243.         return false;
  244.    
  245.     phandle device = ofw_find_device(device_name);
  246.     if (device == -1)
  247.         return false;
  248.    
  249.     if (ofw_get_property(device, "address", &virtaddr, sizeof(virtaddr)) <= 0)
  250.         return false;
  251.  
  252.     screen->addr = (void *) ((uintptr_t) virtaddr);
  253.  
  254.     if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
  255.         return false;
  256.    
  257.     if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
  258.         return false;
  259.    
  260.     if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
  261.         return false;
  262.    
  263.     if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
  264.         return false;
  265.    
  266.     return true;
  267. }
  268.