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/* SPDX-License-Identifier: copyleft-next-0.3.1 */
/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
/**
* @file mem.c
* Generic memory handling, used both by physical and virtual memory.
*/
#include <kmi/types.h>
#include <kmi/mem.h>
#include <kmi/vmem.h>
#include <libfdt.h>
size_t __mm_shifts[10];
size_t __mm_widths[10];
size_t __mm_sizes[10];
size_t __mm_page_shift;
enum mm_order __mm_max_order;
/**
* RAM base address. Not sure if it should be provided through a macro
* like __mm_*.
*/
pm_t ram_base;
size_t ram_size;
enum mm_order nearest_order(size_t size)
{
for (enum mm_order order = max_order(); order >= MM_MIN; --order)
if (order_size(order) >= size)
return order;
return MM_O0;
}
void init_mem(void *fdt)
{
size_t max_order = 0;
size_t base_bits = 0;
size_t bits[NUM_ORDERS] = { 0 };
stat_pmem_conf(fdt, &max_order, &base_bits, bits);
__mm_max_order = max_order;
__mm_page_shift = base_bits;
__mm_shifts[0] = __mm_page_shift;
__mm_widths[0] = 1 << bits[0];
__mm_sizes[0] = 1 << __mm_page_shift;
for (enum mm_order i = MM_O1; i <= max_order(); ++i) {
__mm_widths[i] = 1 << bits[i];
__mm_shifts[i] = __mm_shifts[i - 1] + bits[i - 1];
__mm_sizes[i] = 1UL << __mm_shifts[i];
}
}
void set_ram_base(uintptr_t base)
{
ram_base = base;
}
void set_ram_size(size_t size)
{
ram_size = size;
}
uintptr_t get_ram_base()
{
return ram_base;
}
size_t get_ram_size()
{
return ram_size;
}
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