OK6410A development board (eight) 11 linux-5.11 OK6410A start_kernel print angle first stage mem

This phase is complete

1. Reserve the page table that does not need to be filled according to the reserved member of memblock // reserve_bootmem_region

2. By complementing the reserved memblock in the full physical memory, unused physical memory is obtained and the page table that needs to be filled is filled // __free_memory_core

3. At this point, buddy initialization is complete

4. Fill kmalloc_caches[type([0-1])][idx([6-d])] with (memory address, memory size, requested block size)

5. At this point, slab initialization is complete

6. Register the used virtual memory address A (mainly io devices) in the vmalloc interval to vmap_area_root

7. By complementing A in the full virtual memory (non-vmalloc interval), the virtual address space is obtained and registered to free_vmap_area_root

8. At this point, vmalloc initialization is complete

// Virtual memory layout is no longer printed 

// Please check 1c31d4e96b8c205fe3aa8e73e930a0ccbf4b9a2b

In fact, there is also a section about mem in setup_arch

The mem-related part of setup_arch

2. Match board-level mdesc and parse atags (including core cmdline mem)

5. Initialize various types of descriptor tables

6. Add various (kernel/initrd/device tree/atags/reserved in device tree/) reserved memory to memblock

7. Clear the address where the page table will be stored to 0

8. Fill page tables for multiple contents (lowmem/device tree/vectors/various devices)

10. Apply for memory to store many struct pages 

11. Initialize all struct pages

It can be said that setup_arch completes

1. Creation of virtual page table (lowmem/device tree/vectors/various devices)

2. Initialization of memblock // At the end of setup_arch, memory can be allocated through memblock_alloc

3. The first part of buddy initialization // All low-end memory struct pages are ready

In this article, we focus on the following functions

page_address_init

// null

setup_arch

// This has been discussed before

build_all_zonelists

// Print information

// Built 1 zonelists, mobility grouping on.  Total pages: 65024

mm_init

// Print information

// mem auto-init: stack:off, heap alloc:off, heap free:off

// Memory: 243936K/262144K available (5120K kernel code, 6569K rwdata, 732K rodata, 1024K init, 2134K bss, 18208K reserved, 0K cma-reserved)

// SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1

build_all_zonelists

build_all_zonelists

build_all_zonelists_init

__build_all_zonelists

for_each_online_node(nid) build_zonelists(pgdat);

zonerefs = pgdat->node_zonelists[ZONELIST_FALLBACK]._zonerefs;

nr_zones = build_zonerefs_node(pgdat, zonerefs);

zone = pgdat->node_zones + zone_type;

zoneref_set_zone(zone, &zonerefs[nr_zones++]);

zoneref->zone = zone;

zoneref->zone_idx = zone_idx(zone);

zonerefs += nr_zones;

for_each_possible_cpu(cpu) pageset_init(&per_cpu(boot_pageset, cpu));

mminit_verify_zonelist

cpuset_init_current_mems_allowed

vm_total_pages = nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE)); // fe00

page_group_by_mobility_disabled = 0;

mm_init

mm_init

page_ext_init_flatmem

// null

init_mem_debugging_and_hardening

// ALL

report_remembers

// pr_info

mem_init

set_max_mapnr(pfn_to_page(max_pfn) - mem_map);

max_mapnr = pfn_to_page(max_pfn) - mem_map;

/* this will put all unused low memory onto the freelists */

memblock_free_all

free_unused_memmap // Sparse memory related, release non-existent addresses

free_memmap

reset_all_zones_managed_pages

pages = free_low_memory_core_early

// reserve all the struct page

for_each_reserved_mem_range(i, &start, &end) reserve_bootmem_region(start, end); // reserve_bootmem_region executed 16 times

for (; start_pfn < end_pfn; start_pfn++) 

init_reserved_page(start_pfn);

INIT_LIST_HEAD(&page->lru);

__SetPageReserved(page);

/*

// These 16 are reserved members in memblock

Reserved for kernel/page table/struct page/vectors

There is also memory requested during io map/request_standard_resources

reserve_bootmem_region // 16 times, the reason is 16 times, because memblock_alloc was called 16 times before

start_pfn:50004,end_pfn:50008 // Mark this address as being used, used as a page table

page:cfdf5080

page:cfdf50a0

page:cfdf50c0

page:cfdf50e0

start_pfn:50100,end_pfn:51081 // Mark this address as being used, used in the kernel (__pa(KERNEL_START), KERNEL_END - KERNEL_START)

page:cfdf7000

...

page:cfe16000

start_pfn:5fdbc,end_pfn:5fdf4

page:cfff0780

...

page:cfff0e60

start_pfn:5fdf5,end_pfn:5fffc // Mark this address as being used, used as struct page

page:cfff0ea0

...

page:cfff4f60

start_pfn:5fffc,end_pfn:5fffd

page:cfff4f80

start_pfn:5fffc,end_pfn:5fffd

page:cfff4f80

start_pfn:5fffc,end_pfn:5fffd

page:cfff4f80

start_pfn:5fffc,end_pfn:5fffd

page:cfff4f80

start_pfn:5fffc,end_pfn:5fffd

page:cfff4f80

start_pfn:5fffc,end_pfn:5fffd

page:cfff4f80

start_pfn:5fffc,end_pfn:5fffd

page:cfff4f80

start_pfn:5fffc,end_pfn:5fffd

page:cfff4f80

start_pfn:5fffc,end_pfn:5fffd

page:cfff4f80

start_pfn:5fffc,end_pfn:5fffd

page:cfff4f80

start_pfn:5fffc,end_pfn:5fffd

page:cfff4f80

start_pfn:5fffc,end_pfn:60000 // Mark this section as occupied by vectors and others

page:cfff4f80

...

page:cfff4fe0

*/

// free mem

for_each_free_mem_range __free_memory_core(start, end);

__free_pages_memory(start_pfn, end_pfn); // __free_pages_memory executed 4 times

memblock_free_pages(pfn_to_page(start), start, order);

__free_pages_core

__free_pages_ok

free_one_page

__free_one_page

add_to_free_list(page, zone, order, migratetype);

/*

__free_pages_memory executed 4 times

// The reason why it is 4 times is that the total memory minus the memory of memblock_alloc leaves only 4 consecutive free memory blocks

start_pfn:50000,end_pfn:50004 //Mark this memory as not in use

pfn_to_page(start):cfdf5000, start:50000, order:2

start_pfn:50008,end_pfn:50100 // Mark this memory as not in use. Although this memory belongs to the kernel, it does not belong to the kernel (__pa(KERNEL_START), KERNEL_END - KERNEL_START)

pfn_to_page(start):cfdf5100, start:50008, order:3

pfn_to_page(start):cfdf5200, start:50010, order:4

pfn_to_page(start):cfdf5400, start:50020, order:5

pfn_to_page(start):cfdf5800, start:50040, order:6

pfn_to_page(start):cfdf6000, start:50080, order:7

start_pfn:51081,end_pfn:5fdbc

pfn_to_page(start):cfe16020, start:51081, order:0

pfn_to_page(start):cfe16040, start:51082, order:1

pfn_to_page(start):cfe16080, start:51084, order:2

pfn_to_page(start):cfe16100, start:51088, order:3

pfn_to_page(start):cfe16200, start:51090, order:4

pfn_to_page(start):cfe16400, start:510a0, order:5

pfn_to_page(start):cfe16800, start:510c0, order:6

pfn_to_page(start):cfe17000, start:51100, order:8

pfn_to_page(start):cfe19000, start:51200, order:9

pfn_to_page(start):cfe1d000, start:51400, order:a

pfn_to_page(start):cfe25000, start:51800, order:a

pfn_to_page(start):cfe2d000, start:51c00, order:a

pfn_to_page(start):cfe35000, start:52000, order:a

pfn_to_page(start):cfe3d000, start:52400, order:a

pfn_to_page(start):cfe45000, start:52800, order:a

pfn_to_page(start):cfe4d000, start:52c00, order:a

pfn_to_page(start):cfe55000, start:53000, order:a

pfn_to_page(start):cfe5d000, start:53400, order:a

pfn_to_page(start):cfe65000, start:53800, order:a

pfn_to_page(start):cfe6d000, start:53c00, order:a

pfn_to_page(start):cfe75000, start:54000, order:a

pfn_to_page(start):cfe7d000, start:54400, order:a

pfn_to_page(start):cfe85000, start:54800, order:a

pfn_to_page(start):cfe8d000, start:54c00, order:a

pfn_to_page(start):cfe95000, start:55000, order:a

pfn_to_page(start):cfe9d000, start:55400, order:a

pfn_to_page(start):cfea5000, start:55800, order:a

pfn_to_page(start):cfead000, start:55c00, order:a

pfn_to_page(start):cfeb5000, start:56000, order:a

pfn_to_page(start):cfebd000, start:56400, order:a

pfn_to_page(start):cfec5000, start:56800, order:a

pfn_to_page(start):cfecd000, start:56c00, order:a

pfn_to_page(start):cfed5000, start:57000, order:a

pfn_to_page(start):cfedd000, start:57400, order:a

pfn_to_page(start):cfee5000, start:57800, order:a

pfn_to_page(start):cfeed000, start:57c00, order:a

pfn_to_page(start):cfef5000, start:58000, order:a

pfn_to_page(start):cfefd000, start:58400, order:a

pfn_to_page(start):cff05000, start:58800, order:a

pfn_to_page(start):cff0d000, start:58c00, order:a

pfn_to_page(start):cff15000, start:59000, order:a

pfn_to_page(start):cff1d000, start:59400, order:a

pfn_to_page(start):cff25000, start:59800, order:a

pfn_to_page(start):cff2d000, start:59c00, order:a

pfn_to_page(start):cff35000, start:5a000, order:a

pfn_to_page(start):cff3d000, start:5a400, order:a

pfn_to_page(start):cff45000, start:5a800, order:a

pfn_to_page(start):cff4d000, start:5ac00, order:a

pfn_to_page(start):cff55000, start:5b000, order:a

pfn_to_page(start):cff5d000, start:5b400, order:a

pfn_to_page(start):cff65000, start:5b800, order:a

pfn_to_page(start):cff6d000, start:5bc00, order:a

pfn_to_page(start):cff75000, start:5c000, order:a

pfn_to_page(start):cff7d000, start:5c400, order:a

pfn_to_page(start):cff85000, start:5c800, order:a

pfn_to_page(start):cff8d000, start:5cc00, order:a

pfn_to_page(start):cff95000, start:5d000, order:a

pfn_to_page(start):cff9d000, start:5d400, order:a

pfn_to_page(start):cffa5000, start:5d800, order:a

pfn_to_page(start):cffad000, start:5dc00, order:a

pfn_to_page(start):cffb5000, start:5e000, order:a

pfn_to_page(start):cffbd000, start:5e400, order:a

pfn_to_page(start):cffc5000, start:5e800, order:a

pfn_to_page(start):cffcd000, start:5ec00, order:a

pfn_to_page(start):cffd5000, start:5f000, order:a

pfn_to_page(start):cffdd000, start:5f400, order:a

pfn_to_page(start):cffe5000, start:5f800, order:a

pfn_to_page(start):cffed000, start:5fc00, order:8

pfn_to_page(start):cffef000, start:5fd00, order:7

pfn_to_page(start):cfff0000, start:5fd80, order:5

pfn_to_page(start):cfff0400, start:5fda0, order:4

pfn_to_page(start):cfff0600, start:5fdb0, order:3

pfn_to_page(start):cfff0700, start:5fdb8, order:2

start_pfn:5fdf4,end_pfn:5fdf5 // Mark this memory as not in use

pfn_to_page(start):cfff0e80, start:5fdf4, order:0

*/

/*

So far, 50000000 - 60000000 has been recorded by struct page