函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:arch\x86\kernel\cpu\mtrr\cyrix.c Create Date:2022-07-27 09:07:07
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：cyrix_get_arr

函数原型：static void cyrix_get_arr(unsigned int reg, unsigned long *base, unsigned long *size, mtrr_type *type)

返回类型：void

参数：

类型参数名称
unsigned intreg
unsigned long *base
unsigned long *size
mtrr_type *type
20  arr等于CX86_ARR_BASE加reg左移1位的值加reg
22  local_irq_save(flags)
24  ccr3等于NSC/Cyrix CPU indexed register access. Must be inlined instead of* macros to ensure correct access ordering* Access order is always 0x22 (=offset), 0x23 (=value)
25  setCx86(CX86_CCR3, (ccr3 & 0x0f) | 0x10)
26  ) = NSC/Cyrix CPU indexed register access. Must be inlined instead of* macros to ensure correct access ordering* Access order is always 0x22 (=offset), 0x23 (=value)
27  ) = NSC/Cyrix CPU indexed register access. Must be inlined instead of* macros to ensure correct access ordering* Access order is always 0x22 (=offset), 0x23 (=value)
28  ) = NSC/Cyrix CPU indexed register access. Must be inlined instead of* macros to ensure correct access ordering* Access order is always 0x22 (=offset), 0x23 (=value)
29  rcr等于NSC/Cyrix CPU indexed register access. Must be inlined instead of* macros to ensure correct access ordering* Access order is always 0x22 (=offset), 0x23 (=value)
30  setCx86(CX86_CCR3, ccr3)
32  local_irq_restore(flags)
34  shift = ) & 0x0f
35  base右移等于PAGE_SHIFT determines the page size 位
41  如果shift则size等于如果reg小于7则0x1UL否则0x40UL左移shift减1位
43  否则size等于0
47  如果reg小于7则
49  当:rcr恒等于1
50  type等于MTRR memory types, which are defined in SDM
51  退出
52  当:rcr恒等于8
53  type等于MTRR_TYPE_WRBACK
54  退出
55  当:rcr恒等于9
56  type等于MTRR_TYPE_WRCOMB
57  退出
58  当:rcr恒等于24
59  默认
60  type等于#define MTRR_TYPE_ 3
61  退出
63  否则
65  当:rcr恒等于0
66  type等于MTRR memory types, which are defined in SDM
67  退出
68  当:rcr恒等于8
69  type等于MTRR_TYPE_WRCOMB
70  退出
71  当:rcr恒等于9
72  type等于MTRR_TYPE_WRBACK
73  退出
74  当:rcr恒等于25
75  默认
76  type等于#define MTRR_TYPE_ 3
77  退出
调用者
名称描述
cyrix_get_free_regionyrix_get_free_region - get a free ARR.*@base: the starting (base) address of the region.*@size: the size (in bytes) of the region.* Returns: the index of the region on success, else -1 on error.