void *phys_map(phys_addr_t addr, size_t size, int mmflag)
{
phys_addr_t base;
phys_addr_t end;
void *ret = NULL;
if (!size) {
/* What do you want to do??? */
ASSERT(0);
goto out;
}
/* Use the physical map area if the range lies within it. For more
* information please refer to the memory layout of our system.
*/
if (PMAP_CONTAINS(addr, size)) {
ret = (void *)addr;
goto out;
}
base = ROUND_DOWN(addr, PAGE_SIZE);
end = ROUND_UP(addr + size, PAGE_SIZE);
ASSERT(end > base);
/* Map pages from kernel memory */
ret = kmem_map(base, end - base, mmflag);
if (ret) {
ret = (char *)ret + (addr - base); // Don't miss the offset
}
DEBUG(DL_DBG, ("addr(%x), size(%x), ret(%p).\n", addr, size, ret));
out:
return ret;
}
/** Map physical memory into the kernel address space.
* @param addr Physical address to map.
* @param size Size of range to map.
* @param mmflag Allocation flags.
* @return Pointer to mapped data. */
void *phys_map(phys_ptr_t addr, size_t size, unsigned mmflag) {
phys_ptr_t base, end;
if(unlikely(!size))
return NULL;
/* Use the physical map area if the range lies within it. */
if(PMAP_CONTAINS(addr, size))
return (void *)(KERNEL_PMAP_BASE + (addr - KERNEL_PMAP_OFFSET));
/* Outside the physical map area. Must instead allocate some kernel
* memory space and map there. */
base = round_down(addr, PAGE_SIZE);
end = round_up(addr + size, PAGE_SIZE);
return kmem_map(base, end - base, mmflag);
}
