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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>
/** Page order shifts. */
static size_t mm_shifts[10];
/** Page order widths. */
static size_t mm_widths[10];
/** Page order sizes. */
static size_t mm_sizes[10];
/** Base page shift, i.e. how many bits are just offsets within a page. */
static size_t mm_page_shift;
/** Maximum order supported by the current cpu. */
static enum mm_order mm_max_order;
size_t order_shift(enum mm_order order)
{
return mm_shifts[order];
}
size_t order_size(enum mm_order order)
{
return mm_sizes[order];
}
enum mm_order max_order()
{
return mm_max_order;
}
size_t order_width(enum mm_order order)
{
return mm_widths[order];
}
size_t page_shift()
{
return mm_page_shift;
}
/**
* RAM base address. Not sure if it should be provided through a macro
* like __mm_*.
*/
static pm_t ram_base;
/** RAM size. */
static size_t ram_size;
/** Load address. */
static pm_t load_addr;
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 top_order = 0;
size_t base_bits = 0;
size_t bits[NUM_ORDERS] = { 0 };
stat_pmem_conf(fdt, &top_order, &base_bits, bits);
mm_max_order = top_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(pm_t base)
{
ram_base = base;
}
void set_ram_size(size_t size)
{
ram_size = size;
}
void set_load_addr(pm_t addr)
{
load_addr = addr;
}
pm_t get_ram_base()
{
return ram_base;
}
size_t get_ram_size()
{
return ram_size;
}
uintptr_t get_load_addr()
{
return load_addr;
}
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