0xc0000001

is the same* Process from the user state into the kernel state will not cause CR3 changes but will cause the stack changes About Virtual kernel space (logical address) mapping to physical space: When kernel module code or thread accesses memory, the memory address in code is logical address, and corresponding to true physical memory address,

from user state into kernel state does not cause CR3 changes but it can cause stack changes About Virtual kernel space (logical address) mapping to physical space: When the kernel module code or thread accesses memory, the memory address in the code is a logical address, and the corresponding to the real physical memory address requires a one

from user state into kernel state does not cause CR3 changes but it can cause stack changes About Virtual kernel space (logical address) mapping to physical space: When the kernel module code or thread accesses memory, the memory address in the code is a logical address, and the corresponding to the real physical memory address requires a on

( 896MB ~ end ) . Why should there be a concept of high-end memory? If the logical address 0xc0000003 corresponds to the physical address of 0x3,0xc0000004 The corresponding physical address is 0x4,... , the relationship between the logical address and the physical address isPhysical Address = Logical Address –0xc0000000 Logical Address Physical memory Address 0xc0000000 0 x0 0xc0000001

the same address. Process A also cannot directly access the process address space of process B through its own process space. When the linear address is greater than 3G (i.e. 0xc0000000), the linear address here is kernel space, the kernel address space is 1G, and the address is from 0xc0000000 to 0xFFFFFFFF. In the kernel address space, the kernel maps the first 896MB linear address directly to the first 896MB of the physical address, that is to say, the physical address of the linear address

[0x18] = 'O ';Keymap [0x19] = 'P ';Keymap [0x10] = 'q ';Keymap [0x13] = 'R ';Keymap [0x1f] ='s ';Keymap [0x14] = 'T ';Keymap [0x16] = 'U ';Keymap [0x2f] = 'V ';Keymap [0x11] = 'W ';Keymap [0x2d] = 'X ';Keymap [0x15] = 'y ';Keymap [0x2c] = 'Z ';Keymap [0x1c] = vk_return;Keymap [0xc8] = vk_up;Keymap [0xd0] = vk_down;Keymap [0xcb] = vk_left;Keymap [0xcd] = vk_right;}// Compile a function for setting the keyboard to 80 Void setkeydown (byte VK){// Case-sensitive ConversionIf (VK> = 'A' VK {VK | =

kernel address space partition is different.The origin of the Linux kernel high-end memoryWhen kernel module code or thread accesses memory, the memory address in code is logical address, and corresponding to true physical memory address, need address one-to -one mapping, such as logical address 0xc0000003 corresponding physical address is 0x 3,0xc0000004 corresponds to the physical address of 0x4, ..., the logical address corresponds to the physical address of the relationship isPhysical Addr

= logical address –0xc0000000 logic Address physical memory address 0xc0000000 0x0 0xc0000001 0x1 0xc00000 0x2 0xc0000003 0x3 ... 0xe0000000

Holding the take doctrine, he picked the part, the following excerpt from the network.Linux Kernel address space partitioningTypically, the 32-bit Linux kernel address space is partitioned 0~3g to user space and 3~4g to kernel space. Note that this is a 32-bit kernel address space partition, and the 64-bit kernel address space partition is different.The origin of the Linux kernel high-end memoryWhen kernel module code or thread accesses memory, the memory address in code is logical address, and

When using bus hound to debug the USB drive, the capture page will encounter a crawl error message, the error code will be displayed in the data field, depending on the display, the meaning is as follows: By the way, records are used for later code analysis. Value Code meaning Usbd_status_crc 0xC0000001 CRC error (defined for backward compatibility with the USB 1.0). Usbd_status_btstuff 0xc000000

corresponding to true physical memory address, need address one-to -one mapping, such as logical address 0xc0000003 corresponding physical address is 0x 3,0xc0000004 corresponds to the physical address of 0x4, ..., the logical address corresponds to the physical address of the relationship isPhysical Address = logical address –0xc0000000 Logical Address Physical memory Address 0xc0000000 0x0 0xc0000001