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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. #include <types.h>
  33.  
  34. #define MAX_OFW_ARGS        10
  35.  
  36. /** OpenFirmware command structure
  37.  *
  38.  */
  39. typedef struct {
  40.     const char *service;          /**< Command name */
  41.     unsigned long nargs;          /**< Number of in arguments */
  42.     unsigned long nret;           /**< Number of out arguments */
  43.     ofw_arg_t args[MAX_OFW_ARGS]; /**< List of arguments */
  44. } ofw_args_t;
  45.  
  46. typedef void (*ofw_entry)(ofw_args_t *);
  47.  
  48. ofw_entry ofw;
  49.  
  50. phandle ofw_chosen;
  51. ihandle ofw_stdout;
  52. phandle ofw_root;
  53. ihandle ofw_mmu;
  54. phandle ofw_memory;
  55. phandle ofw_aliases;
  56.  
  57. static unsigned long ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets, ...)
  58. {
  59.     va_list list;
  60.     ofw_args_t args;
  61.     int i;
  62.    
  63.     args.service = service;
  64.     args.nargs = nargs;
  65.     args.nret = nret;
  66.    
  67.     va_start(list, rets);
  68.     for (i = 0; i < nargs; i++)
  69.         args.args[i] = va_arg(list, ofw_arg_t);
  70.     va_end(list);
  71.    
  72.     for (i = 0; i < nret; i++)
  73.         args.args[i + nargs] = 0;
  74.    
  75.     ofw(&args);
  76.    
  77.     for (i = 1; i < nret; i++)
  78.         rets[i - 1] = args.args[i + nargs];
  79.    
  80.     return args.args[nargs];
  81. }
  82.  
  83.  
  84. phandle ofw_find_device(const char *name)
  85. {
  86.     return ofw_call("finddevice", 1, 1, NULL, name);
  87. }
  88.  
  89.  
  90. int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
  91. {
  92.     return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
  93. }
  94.  
  95.  
  96. static unsigned int ofw_get_address_cells(const phandle device)
  97. {
  98.     unsigned int ret;
  99.    
  100.     if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
  101.         if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
  102.             ret = 1;
  103.    
  104.     return ret;
  105. }
  106.  
  107.  
  108. static unsigned int ofw_get_size_cells(const phandle device)
  109. {
  110.     unsigned int ret;
  111.    
  112.     if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
  113.         if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
  114.             ret = 1;
  115.    
  116.     return ret;
  117. }
  118.  
  119.  
  120. static ihandle ofw_open(const char *name)
  121. {
  122.     return ofw_call("open", 1, 1, NULL, name);
  123. }
  124.  
  125.  
  126. void init(void)
  127. {
  128.     ofw_chosen = ofw_find_device("/chosen");
  129.     if (ofw_chosen == -1)
  130.         halt();
  131.    
  132.     if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)
  133.         ofw_stdout = 0;
  134.    
  135.     ofw_root = ofw_find_device("/");
  136.     if (ofw_root == -1) {
  137.         puts("\r\nError: Unable to find / device, halted.\r\n");
  138.         halt();
  139.     }
  140.    
  141.     if (ofw_get_property(ofw_chosen, "mmu",  &ofw_mmu, sizeof(ofw_mmu)) <= 0) {
  142.         puts("\r\nError: Unable to get mmu property, halted.\r\n");
  143.         halt();
  144.     }
  145.    
  146.     ofw_memory = ofw_find_device("/memory");
  147.     if (ofw_memory == -1) {
  148.         puts("\r\nError: Unable to find /memory device, halted.\r\n");
  149.         halt();
  150.     }
  151.    
  152.     ofw_aliases = ofw_find_device("/aliases");
  153.     if (ofw_aliases == -1) {
  154.         puts("\r\nError: Unable to find /aliases device, halted.\r\n");
  155.         halt();
  156.     }
  157. }
  158.  
  159.  
  160. void ofw_write(const char *str, const int len)
  161. {
  162.     if (ofw_stdout == 0)
  163.         return;
  164.    
  165.     ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
  166. }
  167.  
  168.  
  169. void *ofw_translate(const void *virt)
  170. {
  171.     ofw_arg_t result[4];
  172.     int shift;
  173.  
  174.     if (ofw_call("call-method", 3, 5, result, "translate", ofw_mmu, virt) != 0) {
  175.         puts("Error: MMU method translate() failed, halting.\n");
  176.         halt();
  177.     }
  178.  
  179.     if (sizeof(unative_t) == 8)
  180.         shift = 32;
  181.     else
  182.         shift = 0;
  183.        
  184.     return (void *) (((result[2]&0xffffffff)<<shift)|((result[3])&0xffffffff));
  185. }
  186.  
  187.  
  188. int ofw_map(const void *phys, const void *virt, const int size, const int mode)
  189. {
  190.     uintptr_t phys_hi, phys_lo;
  191.  
  192.     if (sizeof(unative_t) == 8) {
  193.         int shift = 32;
  194.         phys_hi = (uintptr_t) phys >> shift;
  195.         phys_lo = (uintptr_t) phys & 0xffffffff;
  196.     } else {
  197.         phys_hi = 0;
  198.         phys_lo = (uintptr_t) phys;
  199.     }
  200.  
  201.     return ofw_call("call-method", 7, 1, NULL, "map", ofw_mmu, mode, size, virt,
  202.         phys_hi, phys_lo);
  203. }
  204.  
  205.  
  206. int ofw_memmap(memmap_t *map)
  207. {
  208.     unsigned long buf[BUF_SIZE];
  209.     int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(buf));
  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 long)) && (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(device_name)) <= 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.