bootm.c 4.7 KB

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  1. /*
  2. * Copyright (C) 2004-2006 Atmel Corporation
  3. *
  4. * SPDX-License-Identifier: GPL-2.0+
  5. */
  6. #include <common.h>
  7. #include <command.h>
  8. #include <image.h>
  9. #include <u-boot/zlib.h>
  10. #include <asm/byteorder.h>
  11. #include <asm/arch/addrspace.h>
  12. #include <asm/io.h>
  13. #include <asm/setup.h>
  14. #include <asm/arch/clk.h>
  15. DECLARE_GLOBAL_DATA_PTR;
  16. /* CPU-specific hook to allow flushing of caches, etc. */
  17. extern void prepare_to_boot(void);
  18. static struct tag *setup_start_tag(struct tag *params)
  19. {
  20. params->hdr.tag = ATAG_CORE;
  21. params->hdr.size = tag_size(tag_core);
  22. params->u.core.flags = 0;
  23. params->u.core.pagesize = 4096;
  24. params->u.core.rootdev = 0;
  25. return tag_next(params);
  26. }
  27. static struct tag *setup_memory_tags(struct tag *params)
  28. {
  29. bd_t *bd = gd->bd;
  30. int i;
  31. for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
  32. params->hdr.tag = ATAG_MEM;
  33. params->hdr.size = tag_size(tag_mem_range);
  34. params->u.mem_range.addr = bd->bi_dram[i].start;
  35. params->u.mem_range.size = bd->bi_dram[i].size;
  36. params = tag_next(params);
  37. }
  38. return params;
  39. }
  40. static struct tag *setup_commandline_tag(struct tag *params, char *cmdline)
  41. {
  42. if (!cmdline)
  43. return params;
  44. /* eat leading white space */
  45. while (*cmdline == ' ') cmdline++;
  46. /*
  47. * Don't include tags for empty command lines; let the kernel
  48. * use its default command line.
  49. */
  50. if (*cmdline == '\0')
  51. return params;
  52. params->hdr.tag = ATAG_CMDLINE;
  53. params->hdr.size =
  54. (sizeof (struct tag_header) + strlen(cmdline) + 1 + 3) >> 2;
  55. strcpy(params->u.cmdline.cmdline, cmdline);
  56. return tag_next(params);
  57. }
  58. static struct tag *setup_ramdisk_tag(struct tag *params,
  59. unsigned long rd_start,
  60. unsigned long rd_end)
  61. {
  62. if (rd_start == rd_end)
  63. return params;
  64. params->hdr.tag = ATAG_RDIMG;
  65. params->hdr.size = tag_size(tag_mem_range);
  66. params->u.mem_range.addr = rd_start;
  67. params->u.mem_range.size = rd_end - rd_start;
  68. return tag_next(params);
  69. }
  70. static struct tag *setup_clock_tags(struct tag *params)
  71. {
  72. params->hdr.tag = ATAG_CLOCK;
  73. params->hdr.size = tag_size(tag_clock);
  74. params->u.clock.clock_id = ACLOCK_BOOTCPU;
  75. params->u.clock.clock_flags = 0;
  76. params->u.clock.clock_hz = gd->arch.cpu_hz;
  77. #ifdef CONFIG_AT32AP7000
  78. /*
  79. * New kernels don't need this, but we should be backwards
  80. * compatible for a while...
  81. */
  82. params = tag_next(params);
  83. params->hdr.tag = ATAG_CLOCK;
  84. params->hdr.size = tag_size(tag_clock);
  85. params->u.clock.clock_id = ACLOCK_HSB;
  86. params->u.clock.clock_flags = 0;
  87. params->u.clock.clock_hz = get_hsb_clk_rate();
  88. #endif
  89. return tag_next(params);
  90. }
  91. static struct tag *setup_ethernet_tag(struct tag *params,
  92. char *addr, int index)
  93. {
  94. char *s, *e;
  95. int i;
  96. params->hdr.tag = ATAG_ETHERNET;
  97. params->hdr.size = tag_size(tag_ethernet);
  98. params->u.ethernet.mac_index = index;
  99. params->u.ethernet.mii_phy_addr = gd->bd->bi_phy_id[index];
  100. s = addr;
  101. for (i = 0; i < 6; i++) {
  102. params->u.ethernet.hw_address[i] = simple_strtoul(s, &e, 16);
  103. s = e + 1;
  104. }
  105. return tag_next(params);
  106. }
  107. static struct tag *setup_ethernet_tags(struct tag *params)
  108. {
  109. char name[16] = "ethaddr";
  110. char *addr;
  111. int i = 0;
  112. do {
  113. addr = getenv(name);
  114. if (addr)
  115. params = setup_ethernet_tag(params, addr, i);
  116. sprintf(name, "eth%daddr", ++i);
  117. } while (i < 4);
  118. return params;
  119. }
  120. static struct tag *setup_boardinfo_tag(struct tag *params)
  121. {
  122. params->hdr.tag = ATAG_BOARDINFO;
  123. params->hdr.size = tag_size(tag_boardinfo);
  124. params->u.boardinfo.board_number = gd->bd->bi_board_number;
  125. return tag_next(params);
  126. }
  127. static void setup_end_tag(struct tag *params)
  128. {
  129. params->hdr.tag = ATAG_NONE;
  130. params->hdr.size = 0;
  131. }
  132. int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
  133. {
  134. void (*theKernel)(int magic, void *tagtable);
  135. struct tag *params, *params_start;
  136. char *commandline = getenv("bootargs");
  137. /*
  138. * allow the PREP bootm subcommand, it is required for bootm to work
  139. *
  140. * TODO: Andreas Bießmann <andreas@biessmann.org> refactor the
  141. * do_bootm_linux() for avr32
  142. */
  143. if (flag & BOOTM_STATE_OS_PREP)
  144. return 0;
  145. if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  146. return 1;
  147. theKernel = (void *)images->ep;
  148. bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  149. params = params_start = (struct tag *)gd->bd->bi_boot_params;
  150. params = setup_start_tag(params);
  151. params = setup_memory_tags(params);
  152. if (images->rd_start) {
  153. params = setup_ramdisk_tag(params,
  154. PHYSADDR(images->rd_start),
  155. PHYSADDR(images->rd_end));
  156. }
  157. params = setup_commandline_tag(params, commandline);
  158. params = setup_clock_tags(params);
  159. params = setup_ethernet_tags(params);
  160. params = setup_boardinfo_tag(params);
  161. setup_end_tag(params);
  162. printf("\nStarting kernel at %p (params at %p)...\n\n",
  163. theKernel, params_start);
  164. prepare_to_boot();
  165. theKernel(ATAG_MAGIC, params_start);
  166. /* does not return */
  167. return 1;
  168. }