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https://github.com/hardkernel/kernel_common_drivers.git
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Jianxiong Pan
a783454143
PD#SWPL-114938 Problem: need free reserved memory in ko. Solution: export the free_reserved_mem func. Verify: t5m_ay301. Change-Id: Ib086317c00ece3f6017bb3b3e0454915f924b28c Signed-off-by: Jianxiong Pan <jianxiong.pan@amlogic.com>
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
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/*
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* Copyright (c) 2019 Amlogic, Inc. All rights reserved.
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*/
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//#define DEBUG
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <linux/moduleparam.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/mm.h>
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#include <linux/kasan.h>
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#include <linux/amlogic/module_merge.h>
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#include "main.h"
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#include <linux/amlogic/aml_free_reserved.h>
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unsigned long aml_free_reserved_area(void *start, void *end, int poison, const char *s)
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{
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void *pos;
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unsigned long pages = 0;
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start = (void *)PAGE_ALIGN((unsigned long)start);
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end = (void *)((unsigned long)end & PAGE_MASK);
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for (pos = start; pos < end; pos += PAGE_SIZE, pages++) {
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struct page *page = virt_to_page(pos);
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void *direct_map_addr;
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/*
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* 'direct_map_addr' might be different from 'pos'
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* because some architectures' virt_to_page()
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* work with aliases. Getting the direct map
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* address ensures that we get a _writeable_
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* alias for the memset().
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*/
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direct_map_addr = page_address(page);
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/*
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* Perform a kasan-unchecked memset() since this memory
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* has not been initialized.
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*/
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direct_map_addr = kasan_reset_tag(direct_map_addr);
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if ((unsigned int)poison <= 0xFF)
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memset(direct_map_addr, poison, PAGE_SIZE);
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free_reserved_page(page);
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}
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if (pages && s)
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pr_info("Freeing %s memory: %ldK\n",
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s, pages << (PAGE_SHIFT - 10));
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return pages;
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}
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EXPORT_SYMBOL(aml_free_reserved_area);
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static int __init memory_main_init(void)
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{
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pr_debug("### %s() start\n", __func__);
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call_sub_init(filecache_module_init);
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call_sub_init(aml_watch_pint_init);
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call_sub_init(aml_reg_init);
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call_sub_init(ddr_tool_init);
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call_sub_init(ramdump_init);
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pr_debug("### %s() end\n", __func__);
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return 0;
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}
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static void __exit memory_main_exit(void)
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{
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ramdump_uninit();
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ddr_tool_exit();
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aml_reg_exit();
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aml_watch_point_uninit();
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filecache_module_exit();
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}
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module_init(memory_main_init);
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module_exit(memory_main_exit);
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MODULE_LICENSE("GPL v2");
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