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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. ihandle ofw_memory_prop;
  42. phandle ofw_memory;
  43. phandle ofw_aliases;
  44.  
  45. void ofw_init(void)
  46. {
  47.     ofw_chosen = ofw_find_device("/chosen");
  48.     if (ofw_chosen == -1)
  49.         halt();
  50.    
  51.     if (ofw_get_property(ofw_chosen, "stdout", &ofw_stdout, sizeof(ofw_stdout)) <= 0)
  52.         ofw_stdout = 0;
  53.    
  54.     ofw_root = ofw_find_device("/");
  55.     if (ofw_root == -1) {
  56.         puts("\r\nError: Unable to find / device, halted.\r\n");
  57.         halt();
  58.     }
  59.    
  60.     if (ofw_get_property(ofw_chosen, "mmu", &ofw_mmu, sizeof(ofw_mmu)) <= 0) {
  61.         puts("\r\nError: Unable to get mmu property, halted.\r\n");
  62.         halt();
  63.     }
  64.     if (ofw_get_property(ofw_chosen, "memory", &ofw_memory_prop, sizeof(ofw_memory_prop)) <= 0) {
  65.         puts("\r\nError: Unable to get memory property, halted.\r\n");
  66.         halt();
  67.     }
  68.  
  69.     ofw_memory = ofw_find_device("/memory");
  70.     if (ofw_memory == -1) {
  71.         puts("\r\nError: Unable to find /memory device, halted.\r\n");
  72.         halt();
  73.     }
  74.    
  75.     ofw_aliases = ofw_find_device("/aliases");
  76.     if (ofw_aliases == -1) {
  77.         puts("\r\nError: Unable to find /aliases device, halted.\r\n");
  78.         halt();
  79.     }
  80. }
  81.  
  82. /** Perform a call to OpenFirmware client interface.
  83.  *
  84.  * @param service String identifying the service requested.
  85.  * @param nargs Number of input arguments.
  86.  * @param nret Number of output arguments. This includes the return value.
  87.  * @param rets Buffer for output arguments or NULL. The buffer must accommodate nret - 1 items.
  88.  *
  89.  * @return Return value returned by the client interface.
  90.  */
  91. unsigned long ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets, ...)
  92. {
  93.     va_list list;
  94.     ofw_args_t args;
  95.     int i;
  96.    
  97.     args.service = (ofw_arg_t) service;
  98.     args.nargs = nargs;
  99.     args.nret = nret;
  100.    
  101.     va_start(list, rets);
  102.     for (i = 0; i < nargs; i++)
  103.         args.args[i] = va_arg(list, ofw_arg_t);
  104.     va_end(list);
  105.    
  106.     for (i = 0; i < nret; i++)
  107.         args.args[i + nargs] = 0;
  108.    
  109.     (void) ofw(&args);
  110.  
  111.     for (i = 1; i < nret; i++)
  112.         rets[i - 1] = args.args[i + nargs];
  113.  
  114.     return args.args[nargs];
  115. }
  116.  
  117. phandle ofw_find_device(const char *name)
  118. {
  119.     return ofw_call("finddevice", 1, 1, NULL, name);
  120. }
  121.  
  122. int ofw_get_property(const phandle device, const char *name, void *buf, const int buflen)
  123. {
  124.     return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
  125. }
  126.  
  127. int ofw_get_proplen(const phandle device, const char *name)
  128. {
  129.     return ofw_call("getproplen", 2, 1, NULL, device, name);
  130. }
  131.  
  132. int ofw_next_property(const phandle device, char *previous, char *buf)
  133. {
  134.     return ofw_call("nextprop", 3, 1, NULL, device, previous, buf);
  135. }
  136.  
  137. int ofw_package_to_path(const phandle device, char *buf, const int buflen)
  138. {
  139.     return ofw_call("package-to-path", 3, 1, NULL, device, buf, buflen);
  140. }
  141.  
  142. unsigned int ofw_get_address_cells(const phandle device)
  143. {
  144.     unsigned int ret = 1;
  145.    
  146.     if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
  147.         if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
  148.             ret = OFW_ADDRESS_CELLS;
  149.    
  150.     return ret;
  151. }
  152.  
  153.  
  154. unsigned int ofw_get_size_cells(const phandle device)
  155. {
  156.     unsigned int ret;
  157.    
  158.     if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
  159.         if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
  160.             ret = OFW_SIZE_CELLS;
  161.    
  162.     return ret;
  163. }
  164.  
  165. phandle ofw_get_child_node(const phandle node)
  166. {
  167.     return ofw_call("child", 1, 1, NULL, node);
  168. }
  169.  
  170. phandle ofw_get_peer_node(const phandle node)
  171. {
  172.     return ofw_call("peer", 1, 1, NULL, node);
  173. }
  174.  
  175. static ihandle ofw_open(const char *name)
  176. {
  177.     return ofw_call("open", 1, 1, NULL, name);
  178. }
  179.  
  180.  
  181. void ofw_write(const char *str, const int len)
  182. {
  183.     if (ofw_stdout == 0)
  184.         return;
  185.    
  186.     ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
  187. }
  188.  
  189.  
  190. void *ofw_translate(const void *virt)
  191. {
  192.     ofw_arg_t result[4];
  193.     int shift;
  194.  
  195.     if (ofw_call("call-method", 3, 5, result, "translate", ofw_mmu, virt) != 0) {
  196.         puts("Error: MMU method translate() failed, halting.\n");
  197.         halt();
  198.     }
  199.  
  200.     if (ofw_translate_failed(result[0]))
  201.         return NULL;
  202.  
  203.     if (sizeof(unative_t) == 8)
  204.         shift = 32;
  205.     else
  206.         shift = 0;
  207.  
  208.     return (void *) ((result[2] << shift) | result[3]);
  209. }
  210.  
  211. void *ofw_claim_virt(const void *virt, const int len)
  212. {
  213.     ofw_arg_t retaddr;
  214.  
  215.     if (ofw_call("call-method", 5, 2, &retaddr, "claim", ofw_mmu, 0, len, virt) != 0) {
  216.         puts("Error: MMU method claim() failed, halting.\n");
  217.         halt();
  218.     }
  219.  
  220.     return (void *) retaddr;
  221. }
  222.  
  223. void *ofw_claim_phys(const void *phys, const int len)
  224. {
  225.     ofw_arg_t retaddr[2];
  226.     int shift;
  227.  
  228.     if (sizeof(unative_t) == 8) {
  229.         shift = 32;
  230.         if (ofw_call("call-method", 6, 3, retaddr, "claim",
  231.             ofw_memory_prop, 0, len, ((uintptr_t) phys) >> shift,
  232.             ((uintptr_t) phys) & ((uint32_t) -1)) != 0) {
  233.             /*
  234.              * Note that this will help us to discover
  235.              * conflicts between OpenFirmware allocations
  236.              * and our use of physical memory.
  237.              * It is better to detect collisions here
  238.              * than to cope with weird errors later.
  239.              *
  240.              * So this is really not to make the loader
  241.              * more generic; it is here for debugging
  242.              * purposes.
  243.              */
  244.             puts("Error: memory method claim() failed, halting.\n");
  245.             halt();
  246.         }
  247.     } else {
  248.         shift = 0;
  249.         /*
  250.          * FIXME: the number of arguments is probably different...
  251.          */
  252.         puts("Error: 32-bit ofw_claim_phys not implemented.\n");
  253.         halt();
  254.     }
  255.  
  256.     return (void *) ((retaddr[0] << shift) | retaddr[1]);
  257. }
  258.  
  259. int ofw_map(const void *phys, const void *virt, const int size, const int mode)
  260. {
  261.     uintptr_t phys_hi, phys_lo;
  262.  
  263.     if (sizeof(unative_t) == 8) {
  264.         int shift = 32;
  265.         phys_hi = (uintptr_t) phys >> shift;
  266.         phys_lo = (uintptr_t) phys & 0xffffffff;
  267.     } else {
  268.         phys_hi = 0;
  269.         phys_lo = (uintptr_t) phys;
  270.     }
  271.  
  272.     return ofw_call("call-method", 7, 1, NULL, "map", ofw_mmu, mode, size, virt,
  273.         phys_hi, phys_lo);
  274. }
  275.  
  276. /** Save OpenFirmware physical memory map.
  277.  *
  278.  * @param map Memory map structure where the map will be saved.
  279.  *
  280.  * @return Zero on failure, non-zero on success.
  281.  */
  282. int ofw_memmap(memmap_t *map)
  283. {
  284.     unsigned int ac = ofw_get_address_cells(ofw_memory) /
  285.         (sizeof(uintptr_t) / sizeof(uint32_t));
  286.     unsigned int sc = ofw_get_size_cells(ofw_memory) /
  287.         (sizeof(uintptr_t) / sizeof(uint32_t));
  288.     printf("address cells: %d, size cells: %d. ", ac, sc);
  289.  
  290.     uintptr_t buf[((ac + sc) * MEMMAP_MAX_RECORDS)];
  291.     int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(buf));
  292.     if (ret <= 0)       /* ret is the number of written bytes */
  293.         return false;
  294.  
  295.     int pos;
  296.     map->total = 0;
  297.     map->count = 0;
  298.     for (pos = 0; (pos < ret / sizeof(uintptr_t)) &&
  299.         (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
  300.         void *start = (void *) (buf[pos + ac - 1]);
  301.         unsigned int size = buf[pos + ac + sc - 1];
  302.  
  303.         /*
  304.          * This is a hot fix of the issue which occurs on machines where there are
  305.          * holes in the physical memory (such as SunBlade 1500). Should we detect a
  306.          * hole in the physical memory, we will ignore any memory detected behind
  307.          * the hole and pretend the hole does not exist.
  308.          */
  309.         if ((map->count > 0) &&
  310.             (map->zones[map->count - 1].start + map->zones[map->count - 1].size
  311.                 < start))
  312.             break;
  313.  
  314.         if (size > 0) {
  315.             map->zones[map->count].start = start;
  316.             map->zones[map->count].size = size;
  317.             map->count++;
  318.             map->total += size;
  319.         }
  320.     }
  321.    
  322.     return true;
  323. }
  324.  
  325. int ofw_screen(screen_t *screen)
  326. {
  327.     char device_name[BUF_SIZE];
  328.     uint32_t virtaddr;
  329.    
  330.     if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(device_name)) <= 0)
  331.         return false;
  332.    
  333.     phandle device = ofw_find_device(device_name);
  334.     if (device == -1)
  335.         return false;
  336.    
  337.     if (ofw_get_property(device, "address", &virtaddr, sizeof(virtaddr)) <= 0)
  338.         return false;
  339.  
  340.     screen->addr = (void *) ((uintptr_t) virtaddr);
  341.  
  342.     if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
  343.         return false;
  344.    
  345.     if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
  346.         return false;
  347.    
  348.     if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
  349.         return false;
  350.    
  351.     if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
  352.         return false;
  353.    
  354.     return true;
  355. }
  356.  
  357.  
  358. void ofw_quiesce(void)
  359. {
  360.     ofw_call("quiesce", 0, 0, NULL);
  361. }
  362.