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550W, a high-end OS
ioremap.h
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1 #pragma once
2 
3 // using this as IO address space (at most using 1 GB, so that it can be store
4 // in one pgdir entry)
5 #define IO_ADDR_START 0xffffffe000000000lu
6 
7 void *k_ioremap(unsigned long phys_addr, unsigned long size);
8 void k_iounmap(void *io_addr);
void * k_ioremap(unsigned long phys_addr, unsigned long size)
Definition: ioremap.c:10
void k_iounmap(void *io_addr)
Definition: ioremap.c:26