1 /* $OpenBSD: loongson3_machdep.c,v 1.1 2015/08/15 22:31:38 miod Exp $ */
2
3 /*
4 * Copyright (c) 2009, 2010, 2014 Miodrag Vallat.
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <sys/param.h>
20 #include <sys/systm.h>
21 #include <sys/kernel.h>
22 #include <sys/proc.h>
23 #include <sys/sysctl.h>
24
25 #include <uvm/uvm_extern.h>
26
27 #include <machine/autoconf.h>
28 #include <machine/cpu.h>
29 #include <machine/memconf.h>
30 #include <machine/pmon.h>
31
32 #ifdef HIBERNATE
33 #include <machine/hibernate_var.h>
34 #endif /* HIBERNATE */
35
36 extern struct phys_mem_desc mem_layout[MAXMEMSEGS];
37
38 void loongson3a_setup(u_long, u_long);
39
40 #if 0
41 /* PCI view of CPU memory */
42 paddr_t loongson_dma_base = 0;
43 #endif
44
45 #define MEMLO_BASE 0x00000000UL
46 #define MEMHI_BASE 0x90000000UL /* 2G + 256MB */
47
48 /*
49 * Setup memory mappings for Loongson 3A processors.
50 */
51
52 void
loongson3a_setup(u_long memlo,u_long memhi)53 loongson3a_setup(u_long memlo, u_long memhi)
54 {
55 physmem = memlo + memhi + 16; /* in MB so far */
56
57 memlo = atop(memlo << 20);
58 memhi = atop(memhi << 20);
59 physmem = memlo + memhi + atop(16 << 20);
60
61 /* do NOT stomp on exception area */
62 mem_layout[0].mem_first_page = atop(MEMLO_BASE) + 1;
63 mem_layout[0].mem_last_page = atop(MEMLO_BASE) + memlo;
64 #ifdef HIBERNATE
65 mem_layout[0].mem_first_page += HIBERNATE_RESERVED_PAGES;
66 #endif
67
68 if (memhi != 0) {
69 #ifdef notyet
70 mem_layout[1].mem_first_page = atop(MEMHI_BASE);
71 mem_layout[1].mem_last_page = atop(MEMHI_BASE) +
72 memhi;
73 #endif
74 }
75 }
76