1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#include <linux/console.h>
#include <linux/memblock.h>
#include <linux/initrd.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/start_kernel.h>
#include <linux/dma-map-ops.h>
#include <linux/screen_info.h>
#include <asm/sections.h>
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>
#ifdef CONFIG_DUMMY_CONSOLE
struct screen_info screen_info = {
.orig_video_lines = 30,
.orig_video_cols = 80,
.orig_video_mode = 0,
.orig_video_ega_bx = 0,
.orig_video_isVGA = 1,
.orig_video_points = 8
};
#endif
static void __init csky_memblock_init(void)
{
unsigned long lowmem_size = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
unsigned long sseg_size = PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET);
unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
signed long size;
memblock_reserve(__pa(_start), _end - _start);
early_init_fdt_reserve_self();
early_init_fdt_scan_reserved_mem();
memblock_dump_all();
min_low_pfn = PFN_UP(memblock_start_of_DRAM());
max_low_pfn = max_pfn = PFN_DOWN(memblock_end_of_DRAM());
size = max_pfn - min_low_pfn;
if (size >= lowmem_size) {
max_low_pfn = min_low_pfn + lowmem_size;
#ifdef CONFIG_PAGE_OFFSET_80000000
write_mmu_msa1(read_mmu_msa0() + SSEG_SIZE);
#endif
} else if (size > sseg_size) {
max_low_pfn = min_low_pfn + sseg_size;
}
max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
mmu_init(min_low_pfn, max_low_pfn);
#ifdef CONFIG_HIGHMEM
max_zone_pfn[ZONE_HIGHMEM] = max_pfn;
highstart_pfn = max_low_pfn;
highend_pfn = max_pfn;
#endif
memblock_set_current_limit(PFN_PHYS(max_low_pfn));
dma_contiguous_reserve(0);
free_area_init(max_zone_pfn);
}
void __init setup_arch(char **cmdline_p)
{
*cmdline_p = boot_command_line;
console_verbose();
pr_info("Phys. mem: %ldMB\n",
(unsigned long) memblock_phys_mem_size()/1024/1024);
setup_initial_init_mm(_start, _etext, _edata, _end);
parse_early_param();
csky_memblock_init();
unflatten_and_copy_device_tree();
#ifdef CONFIG_SMP
setup_smp();
#endif
sparse_init();
fixaddr_init();
#ifdef CONFIG_HIGHMEM
kmap_init();
#endif
}
unsigned long va_pa_offset;
EXPORT_SYMBOL(va_pa_offset);
static inline unsigned long read_mmu_msa(void)
{
#ifdef CONFIG_PAGE_OFFSET_80000000
return read_mmu_msa0();
#endif
#ifdef CONFIG_PAGE_OFFSET_A0000000
return read_mmu_msa1();
#endif
}
asmlinkage __visible void __init csky_start(unsigned int unused,
void *dtb_start)
{
/* Clean up bss section */
memset(__bss_start, 0, __bss_stop - __bss_start);
va_pa_offset = read_mmu_msa() & ~(SSEG_SIZE - 1);
pre_trap_init();
if (dtb_start == NULL)
early_init_dt_scan(__dtb_start);
else
early_init_dt_scan(dtb_start);
start_kernel();
asm volatile("br .\n");
}
|
