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1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3
4#include <linux/console.h>
5#include <linux/memblock.h>
6#include <linux/initrd.h>
7#include <linux/of.h>
8#include <linux/of_fdt.h>
9#include <linux/start_kernel.h>
10#include <linux/dma-map-ops.h>
11#include <asm/sections.h>
12#include <asm/mmu_context.h>
13#include <asm/pgalloc.h>
14
15static void __init csky_memblock_init(void)
16{
17 unsigned long lowmem_size = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
18 unsigned long sseg_size = PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET);
19 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
20 signed long size;
21
22 memblock_reserve(__pa(_start), _end - _start);
23
24 early_init_fdt_reserve_self();
25 early_init_fdt_scan_reserved_mem();
26
27 memblock_dump_all();
28
29 min_low_pfn = PFN_UP(memblock_start_of_DRAM());
30 max_low_pfn = max_pfn = PFN_DOWN(memblock_end_of_DRAM());
31
32 size = max_pfn - min_low_pfn;
33
34 if (size >= lowmem_size) {
35 max_low_pfn = min_low_pfn + lowmem_size;
36#ifdef CONFIG_PAGE_OFFSET_80000000
37 write_mmu_msa1(read_mmu_msa0() + SSEG_SIZE);
38#endif
39 } else if (size > sseg_size) {
40 max_low_pfn = min_low_pfn + sseg_size;
41 }
42
43 max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
44
45 mmu_init(min_low_pfn, max_low_pfn);
46
47#ifdef CONFIG_HIGHMEM
48 max_zone_pfn[ZONE_HIGHMEM] = max_pfn;
49
50 highstart_pfn = max_low_pfn;
51 highend_pfn = max_pfn;
52#endif
53 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
54
55 dma_contiguous_reserve(0);
56
57 free_area_init(max_zone_pfn);
58}
59
60void __init setup_arch(char **cmdline_p)
61{
62 *cmdline_p = boot_command_line;
63
64 console_verbose();
65
66 pr_info("Phys. mem: %ldMB\n",
67 (unsigned long) memblock_phys_mem_size()/1024/1024);
68
69 setup_initial_init_mm(_start, _etext, _edata, _end);
70
71 parse_early_param();
72
73 csky_memblock_init();
74
75 unflatten_and_copy_device_tree();
76
77#ifdef CONFIG_SMP
78 setup_smp();
79#endif
80
81 sparse_init();
82
83 fixaddr_init();
84
85#ifdef CONFIG_HIGHMEM
86 kmap_init();
87#endif
88}
89
90unsigned long va_pa_offset;
91EXPORT_SYMBOL(va_pa_offset);
92
93static inline unsigned long read_mmu_msa(void)
94{
95#ifdef CONFIG_PAGE_OFFSET_80000000
96 return read_mmu_msa0();
97#endif
98
99#ifdef CONFIG_PAGE_OFFSET_A0000000
100 return read_mmu_msa1();
101#endif
102}
103
104asmlinkage __visible void __init csky_start(unsigned int unused,
105 void *dtb_start)
106{
107 /* Clean up bss section */
108 memset(__bss_start, 0, __bss_stop - __bss_start);
109
110 va_pa_offset = read_mmu_msa() & ~(SSEG_SIZE - 1);
111
112 pre_trap_init();
113
114 if (dtb_start == NULL)
115 early_init_dt_scan(__dtb_start);
116 else
117 early_init_dt_scan(dtb_start);
118
119 start_kernel();
120
121 asm volatile("br .\n");
122}
1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3
4#include <linux/console.h>
5#include <linux/memblock.h>
6#include <linux/initrd.h>
7#include <linux/of.h>
8#include <linux/of_fdt.h>
9#include <linux/start_kernel.h>
10#include <linux/dma-contiguous.h>
11#include <linux/screen_info.h>
12#include <asm/sections.h>
13#include <asm/mmu_context.h>
14#include <asm/pgalloc.h>
15
16#ifdef CONFIG_DUMMY_CONSOLE
17struct screen_info screen_info = {
18 .orig_video_lines = 30,
19 .orig_video_cols = 80,
20 .orig_video_mode = 0,
21 .orig_video_ega_bx = 0,
22 .orig_video_isVGA = 1,
23 .orig_video_points = 8
24};
25#endif
26
27phys_addr_t __init_memblock memblock_end_of_REG0(void)
28{
29 return (memblock.memory.regions[0].base +
30 memblock.memory.regions[0].size);
31}
32
33phys_addr_t __init_memblock memblock_start_of_REG1(void)
34{
35 return memblock.memory.regions[1].base;
36}
37
38size_t __init_memblock memblock_size_of_REG1(void)
39{
40 return memblock.memory.regions[1].size;
41}
42
43static void __init csky_memblock_init(void)
44{
45 unsigned long zone_size[MAX_NR_ZONES];
46 unsigned long zhole_size[MAX_NR_ZONES];
47 signed long size;
48
49 memblock_reserve(__pa(_stext), _end - _stext);
50#ifdef CONFIG_BLK_DEV_INITRD
51 memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
52#endif
53
54 early_init_fdt_reserve_self();
55 early_init_fdt_scan_reserved_mem();
56
57 memblock_dump_all();
58
59 memset(zone_size, 0, sizeof(zone_size));
60 memset(zhole_size, 0, sizeof(zhole_size));
61
62 min_low_pfn = PFN_UP(memblock_start_of_DRAM());
63 max_pfn = PFN_DOWN(memblock_end_of_DRAM());
64
65 max_low_pfn = PFN_UP(memblock_end_of_REG0());
66 if (max_low_pfn == 0)
67 max_low_pfn = max_pfn;
68
69 size = max_pfn - min_low_pfn;
70
71 if (memblock.memory.cnt > 1) {
72 zone_size[ZONE_NORMAL] =
73 PFN_DOWN(memblock_start_of_REG1()) - min_low_pfn;
74 zhole_size[ZONE_NORMAL] =
75 PFN_DOWN(memblock_start_of_REG1()) - max_low_pfn;
76 } else {
77 if (size <= PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET))
78 zone_size[ZONE_NORMAL] = max_pfn - min_low_pfn;
79 else {
80 zone_size[ZONE_NORMAL] =
81 PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
82 max_low_pfn = min_low_pfn + zone_size[ZONE_NORMAL];
83 }
84 }
85
86#ifdef CONFIG_HIGHMEM
87 size = 0;
88 if (memblock.memory.cnt > 1) {
89 size = PFN_DOWN(memblock_size_of_REG1());
90 highstart_pfn = PFN_DOWN(memblock_start_of_REG1());
91 } else {
92 size = max_pfn - min_low_pfn -
93 PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
94 highstart_pfn = min_low_pfn +
95 PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
96 }
97
98 if (size > 0)
99 zone_size[ZONE_HIGHMEM] = size;
100
101 highend_pfn = max_pfn;
102#endif
103 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
104
105 dma_contiguous_reserve(0);
106
107 free_area_init_node(0, zone_size, min_low_pfn, zhole_size);
108}
109
110void __init setup_arch(char **cmdline_p)
111{
112 *cmdline_p = boot_command_line;
113
114 console_verbose();
115
116 pr_info("Phys. mem: %ldMB\n",
117 (unsigned long) memblock_phys_mem_size()/1024/1024);
118
119 init_mm.start_code = (unsigned long) _stext;
120 init_mm.end_code = (unsigned long) _etext;
121 init_mm.end_data = (unsigned long) _edata;
122 init_mm.brk = (unsigned long) _end;
123
124 parse_early_param();
125
126 csky_memblock_init();
127
128 unflatten_and_copy_device_tree();
129
130#ifdef CONFIG_SMP
131 setup_smp();
132#endif
133
134 sparse_init();
135
136#ifdef CONFIG_HIGHMEM
137 kmap_init();
138#endif
139
140#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
141 conswitchp = &dummy_con;
142#endif
143}
144
145unsigned long va_pa_offset;
146EXPORT_SYMBOL(va_pa_offset);
147
148asmlinkage __visible void __init csky_start(unsigned int unused,
149 void *dtb_start)
150{
151 /* Clean up bss section */
152 memset(__bss_start, 0, __bss_stop - __bss_start);
153
154 va_pa_offset = read_mmu_msa0() & ~(SSEG_SIZE - 1);
155
156 pre_trap_init();
157 pre_mmu_init();
158
159 if (dtb_start == NULL)
160 early_init_dt_scan(__dtb_start);
161 else
162 early_init_dt_scan(dtb_start);
163
164 start_kernel();
165
166 asm volatile("br .\n");
167}