setup.c 2.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
  3. #include <linux/console.h>
  4. #include <linux/memblock.h>
  5. #include <linux/initrd.h>
  6. #include <linux/of.h>
  7. #include <linux/of_fdt.h>
  8. #include <linux/start_kernel.h>
  9. #include <linux/dma-map-ops.h>
  10. #include <linux/screen_info.h>
  11. #include <asm/sections.h>
  12. #include <asm/mmu_context.h>
  13. #include <asm/pgalloc.h>
  14. #ifdef CONFIG_DUMMY_CONSOLE
  15. struct screen_info screen_info = {
  16. .orig_video_lines = 30,
  17. .orig_video_cols = 80,
  18. .orig_video_mode = 0,
  19. .orig_video_ega_bx = 0,
  20. .orig_video_isVGA = 1,
  21. .orig_video_points = 8
  22. };
  23. #endif
  24. static void __init csky_memblock_init(void)
  25. {
  26. unsigned long lowmem_size = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
  27. unsigned long sseg_size = PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET);
  28. unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
  29. signed long size;
  30. memblock_reserve(__pa(_start), _end - _start);
  31. early_init_fdt_reserve_self();
  32. early_init_fdt_scan_reserved_mem();
  33. memblock_dump_all();
  34. min_low_pfn = PFN_UP(memblock_start_of_DRAM());
  35. max_low_pfn = max_pfn = PFN_DOWN(memblock_end_of_DRAM());
  36. size = max_pfn - min_low_pfn;
  37. if (size >= lowmem_size) {
  38. max_low_pfn = min_low_pfn + lowmem_size;
  39. #ifdef CONFIG_PAGE_OFFSET_80000000
  40. write_mmu_msa1(read_mmu_msa0() + SSEG_SIZE);
  41. #endif
  42. } else if (size > sseg_size) {
  43. max_low_pfn = min_low_pfn + sseg_size;
  44. }
  45. max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
  46. mmu_init(min_low_pfn, max_low_pfn);
  47. #ifdef CONFIG_HIGHMEM
  48. max_zone_pfn[ZONE_HIGHMEM] = max_pfn;
  49. highstart_pfn = max_low_pfn;
  50. highend_pfn = max_pfn;
  51. #endif
  52. memblock_set_current_limit(PFN_PHYS(max_low_pfn));
  53. dma_contiguous_reserve(0);
  54. free_area_init(max_zone_pfn);
  55. }
  56. void __init setup_arch(char **cmdline_p)
  57. {
  58. *cmdline_p = boot_command_line;
  59. console_verbose();
  60. pr_info("Phys. mem: %ldMB\n",
  61. (unsigned long) memblock_phys_mem_size()/1024/1024);
  62. setup_initial_init_mm(_start, _etext, _edata, _end);
  63. parse_early_param();
  64. csky_memblock_init();
  65. unflatten_and_copy_device_tree();
  66. #ifdef CONFIG_SMP
  67. setup_smp();
  68. #endif
  69. sparse_init();
  70. fixaddr_init();
  71. #ifdef CONFIG_HIGHMEM
  72. kmap_init();
  73. #endif
  74. }
  75. unsigned long va_pa_offset;
  76. EXPORT_SYMBOL(va_pa_offset);
  77. static inline unsigned long read_mmu_msa(void)
  78. {
  79. #ifdef CONFIG_PAGE_OFFSET_80000000
  80. return read_mmu_msa0();
  81. #endif
  82. #ifdef CONFIG_PAGE_OFFSET_A0000000
  83. return read_mmu_msa1();
  84. #endif
  85. }
  86. asmlinkage __visible void __init csky_start(unsigned int unused,
  87. void *dtb_start)
  88. {
  89. /* Clean up bss section */
  90. memset(__bss_start, 0, __bss_stop - __bss_start);
  91. va_pa_offset = read_mmu_msa() & ~(SSEG_SIZE - 1);
  92. pre_trap_init();
  93. if (dtb_start == NULL)
  94. early_init_dt_scan(__dtb_start);
  95. else
  96. early_init_dt_scan(dtb_start);
  97. start_kernel();
  98. asm volatile("br .\n");
  99. }