函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:arch\x86\kernel\e820.c Create Date:2022-07-27 08:42:55
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：e820__update_table

函数原型：int __init e820__update_table(struct e820_table *table)

返回类型：int

参数：

类型参数名称
struct e820_table *table
310  entries等于entries
311  max_nr_entries等于ARRAY_SIZE - get the number of elements in array @arr*@arr: array to be sized(entries)
318  如果nr_entries小于2则返回:负1
321  BUG_ON(nr_entries > max_nr_entries)
324  以i小于nr_entries循环
325  如果addr加size小于addr则返回:负1
330  以i小于2乘nr_entries循环change_point[i]等于change_point_list[i]
337  chg_idx等于0
338  以i小于nr_entries循环
339  如果size不等于0则
340  Address for this change point: 等于addr
341  Pointer to the original entry: 等于entries[i]
342  Address for this change point: 等于addr加size
343  Pointer to the original entry: 等于entries[i]
346  chg_nr等于chg_idx
349  sort(change_point, chg_nr, change_point的长度, cpcompare, NULL)
352  overlap_entries等于0
353  new_nr_entries等于0
354  last_type等于0
355  last_addr等于0
358  以chg_idx小于chg_nr循环
360  如果Address for this change point: 恒等于addr则
362  overlap_list[overlap_entries++]等于Pointer to the original entry:
363  否则
365  以i小于overlap_entries循环
369  overlap_entries自减
376  current_type等于0
377  以i小于overlap_entries循环
378  如果type大于current_type则current_type等于type
383  如果current_type不等于last_type或current_type恒等于E820_TYPE_PRAM则
384  如果last_type不等于0则
385  size等于Address for this change point: 减last_addr
387  如果size不等于0则如果new_nr_entries先自加大于等于max_nr_entries则
390  退出
392  如果current_type不等于0则
397  last_type等于current_type
402  memcpy(entries, new_entries, new_nr_entries * entries的长度)
403  nr_entries等于new_nr_entries
405  返回:0
调用者
名称描述
setup_arch平台相关启动
e820__update_table_print
e820__update_table_kexec
e820__memory_setup_extendedBecause of the small fixed size of struct boot_params, only the first* 128 E820 memory entries are passed to the kernel via boot_params.e820_table,* the remaining (if any) entries are passed via the SETUP_E820_EXT node of
e820__reserve_setup_dataReserve all entries from the bootloader's extensible data nodes list,* because if present we are going to use it later on to fetch e820* entries from it:
e820__finish_early_paramsCalled after parse_early_param(), after early parameters (such as mem=)* have been processed, in which case we already have an E820 table filled in* via the parameter callback function(s), but it's not sorted and printed yet:
e820__memory_setup_defaultPass the firmware (bootloader) E820 map to the kernel and process it:
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trim_bios_range