mem.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 */
 4#include <linux/fs.h>
 5#include <linux/fcntl.h>
 6#include <linux/memblock.h>
 7#include <linux/mm.h>
 8
 9#include <asm/bootinfo.h>
10
11#include <loongson.h>
12#include <mem.h>
13#include <pci.h>
14
15
16u32 memsize, highmemsize;
17
18void __init prom_init_memory(void)
19{
20	memblock_add(0x0, (memsize << 20));
21
22#ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
23	{
24		int bit;
25
26		bit = fls(memsize + highmemsize);
27		if (bit != ffs(memsize + highmemsize))
28			bit += 20;
29		else
30			bit = bit + 20 - 1;
31
32		/* set cpu window3 to map CPU to DDR: 2G -> 2G */
33		LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
34					  0x80000000ul, (1 << bit));
35		mmiowb();
36	}
37#endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
38
39#ifdef CONFIG_64BIT
40	if (highmemsize > 0)
41		memblock_add(LOONGSON_HIGHMEM_START, highmemsize << 20);
42#endif /* !CONFIG_64BIT */
43}