From bc600ecc3bdf0f189861dfb840f70c2339a7a853 Mon Sep 17 00:00:00 2001 From: Kimplul Date: Fri, 24 May 2024 13:24:27 +0300 Subject: rename common to src + I keep starting to type src and wondering why autocomplete won't work, I guess src is just uncounciously a better name --- src/mem.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 src/mem.c (limited to 'src/mem.c') diff --git a/src/mem.c b/src/mem.c new file mode 100644 index 0000000..e3f98e7 --- /dev/null +++ b/src/mem.c @@ -0,0 +1,59 @@ +/* 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 +#include +#include +#include + +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; + +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(size_t max_order, size_t bits[10], size_t page_shift) +{ + __mm_max_order = max_order; + __mm_page_shift = page_shift; + + __mm_shifts[0] = 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; +} + +uintptr_t get_ram_base() +{ + return ram_base; +} -- cgit v1.3