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 | |
16 | u32 memsize, highmemsize; |
17 | |
18 | void __init prom_init_memory(void) |
19 | { |
20 | memblock_add(base: 0x0, size: (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(base: LOONGSON_HIGHMEM_START, size: highmemsize << 20); |
42 | #endif /* !CONFIG_64BIT */ |
43 | } |
44 | |