写了一段IA32 paging通用构造代码。有须要的。能够拿去

#define PDE_FLG_RW (1<<1)#define PDE_FLG_US (1<<2)#define PDE_FLG_RWT (1<<3)#define PDE_FLG_PCD (1<<4)/* * initialize to be zero for page directory and page table*/static __SECTION_ZERO_INIT("PAGE_DIR") __align(4096) U32 paging_pde[1<<10];static __SECTION_ZERO_INIT("PAGE_TABLE") __align(4096) U32 paging_pte_4k[1<<10][1<<10];/* * viraddr: virtual address/linear address (must be 4KB align) * phyaddr: physical address (must be 4KB align) * size: in bytes*/static void paging_4k(U32 viraddr, U32 phyaddr, U32 flags){	U32 viraddr_pd = viraddr>>22;	U32 viraddr_pt = (viraddr>>12) & 0x3FF;	/*page directory*/	paging_pde[viraddr_pd] = (U32)(&(paging_pte_4k[viraddr_pd][viraddr_pt])) & 0xFFFFF000;	paging_pde[viraddr_pd] |= flags;	paging_pde[viraddr_pd] |= 1;	paging_pde[viraddr_pd] &= (~(1<<7));	/*page table*/	paging_pte_4k[viraddr_pd][viraddr_pt] = phyaddr & 0xFFFFF000;	paging_pte_4k[viraddr_pd][viraddr_pt] |= flags;	paging_pte_4k[viraddr_pd][viraddr_pt] |= 1;	}static void paging_4k_frames(U32 viraddr, U32 phyaddr, U32 size, U32 flags){	U32 i, count = size >> 12;	for(i=0; i
     
      >22;	/*page directory*/	paging_pde[viraddr_pd] = phyaddr & 0xFFC00000;	paging_pde[viraddr_pd] |= flags;	paging_pde[viraddr_pd] |= 1;	paging_pde[viraddr_pd] |= (1<<7);}static void paging_4m_frames(U32 viraddr, U32 phyaddr, U32 size, U32 flags){	U32 i, count = size >> 22;	for(i=0; i