1
2
3
4
5
6
7
8#include <linux/init.h>
9#include <linux/kernel.h>
10#include <linux/mm.h>
11#include <linux/bootmem.h>
12#include <linux/types.h>
13
14#include <asm/addrspace.h>
15#include <asm/bootinfo.h>
16#include <asm/dec/machtype.h>
17#include <asm/dec/prom.h>
18#include <asm/page.h>
19#include <asm/sections.h>
20
21
22volatile unsigned long mem_err;
23
24
25
26
27
28
29#define CHUNK_SIZE 0x400000
30
31static inline void pmax_setup_memory_region(void)
32{
33 volatile unsigned char *memory_page, dummy;
34 char old_handler[0x80];
35 extern char genexcept_early;
36
37
38 memcpy(&old_handler, (void *)(CKSEG0 + 0x80), 0x80);
39 memcpy((void *)(CKSEG0 + 0x80), &genexcept_early, 0x80);
40
41
42
43
44
45
46 for (memory_page = (unsigned char *)CKSEG1 + CHUNK_SIZE;
47 mem_err == 0 && memory_page < (unsigned char *)CKSEG1 + 0x1e00000;
48 memory_page += CHUNK_SIZE) {
49 dummy = *memory_page;
50 }
51 memcpy((void *)(CKSEG0 + 0x80), &old_handler, 0x80);
52
53 add_memory_region(0, (unsigned long)memory_page - CKSEG1 - CHUNK_SIZE,
54 BOOT_MEM_RAM);
55}
56
57
58
59
60
61static inline void rex_setup_memory_region(void)
62{
63 int i, bitmap_size;
64 unsigned long mem_start = 0, mem_size = 0;
65 memmap *bm;
66
67
68 bm = (memmap *)CKSEG0ADDR(0x28000);
69
70 bitmap_size = rex_getbitmap(bm);
71
72 for (i = 0; i < bitmap_size; i++) {
73
74 if (bm->bitmap[i] == 0xff)
75 mem_size += (8 * bm->pagesize);
76 else if (!mem_size)
77 mem_start += (8 * bm->pagesize);
78 else {
79 add_memory_region(mem_start, mem_size, BOOT_MEM_RAM);
80 mem_start += mem_size + (8 * bm->pagesize);
81 mem_size = 0;
82 }
83 }
84 if (mem_size)
85 add_memory_region(mem_start, mem_size, BOOT_MEM_RAM);
86}
87
88void __init prom_meminit(u32 magic)
89{
90 if (!prom_is_rex(magic))
91 pmax_setup_memory_region();
92 else
93 rex_setup_memory_region();
94}
95
96void __init prom_free_prom_memory(void)
97{
98 unsigned long end;
99
100
101
102
103
104
105#if IS_ENABLED(CONFIG_DECLANCE)
106
107
108
109
110
111
112 if (IOASIC)
113 end = __pa(&_text) - 0x00020000;
114 else
115#endif
116 end = __pa(&_text);
117
118 free_init_pages("unused PROM memory", PAGE_SIZE, end);
119}
120