arch/loongarch/kernel/mem.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   4  */
   5 #include <linux/efi.h>
   6 #include <linux/initrd.h>
   7 #include <linux/memblock.h>
   8
   9 #include <asm/bootinfo.h>
  10 #include <asm/loongson.h>
  11 #include <asm/sections.h>
  12
  13 void __init memblock_init(void)
  14 {
  15         u32 mem_type;
  16         u64 mem_start, mem_end, mem_size;
  17         efi_memory_desc_t *md;
  18
  19         /* Parse memory information */
  20         for_each_efi_memory_desc(md) {
  21                 mem_type = md->type;
  22                 mem_start = md->phys_addr;
  23                 mem_size = md->num_pages << EFI_PAGE_SHIFT;
  24                 mem_end = mem_start + mem_size;
  25
  26                 switch (mem_type) {
  27                 case EFI_LOADER_CODE:
  28                 case EFI_LOADER_DATA:
  29                 case EFI_BOOT_SERVICES_CODE:
  30                 case EFI_BOOT_SERVICES_DATA:
  31                 case EFI_PERSISTENT_MEMORY:
  32                 case EFI_CONVENTIONAL_MEMORY:
  33                         memblock_add(mem_start, mem_size);
  34                         if (max_low_pfn < (mem_end >> PAGE_SHIFT))
  35                                 max_low_pfn = mem_end >> PAGE_SHIFT;
  36                         break;
  37                 case EFI_PAL_CODE:
  38                 case EFI_UNUSABLE_MEMORY:
  39                 case EFI_ACPI_RECLAIM_MEMORY:
  40                         memblock_add(mem_start, mem_size);
  41                         fallthrough;
  42                 case EFI_RESERVED_TYPE:
  43                 case EFI_RUNTIME_SERVICES_CODE:
  44                 case EFI_RUNTIME_SERVICES_DATA:
  45                 case EFI_MEMORY_MAPPED_IO:
  46                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
  47                         memblock_reserve(mem_start, mem_size);
  48                         break;
  49                 }
  50         }
  51
  52         memblock_set_current_limit(PFN_PHYS(max_low_pfn));
  53         memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
  54
  55         /* Reserve the first 2MB */
  56         memblock_reserve(PHYS_OFFSET, 0x200000);
  57
  58         /* Reserve the kernel text/data/bss */
  59         memblock_reserve(__pa_symbol(&_text),
  60                          __pa_symbol(&_end) - __pa_symbol(&_text));
  61
  62         /* Reserve the initrd */
  63         reserve_initrd_mem();
  64 }