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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
27static void __init csky_memblock_init(void)
28{
29 unsigned long lowmem_size = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
30 unsigned long sseg_size = PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET);
31 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
32 signed long size;
33
34 memblock_reserve(__pa(_stext), _end - _stext);
35
36 early_init_fdt_reserve_self();
37 early_init_fdt_scan_reserved_mem();
38
39 memblock_dump_all();
40
41 min_low_pfn = PFN_UP(memblock_start_of_DRAM());
42 max_low_pfn = max_pfn = PFN_DOWN(memblock_end_of_DRAM());
43
44 size = max_pfn - min_low_pfn;
45
46 if (size >= lowmem_size) {
47 max_low_pfn = min_low_pfn + lowmem_size;
48 write_mmu_msa1(read_mmu_msa0() + SSEG_SIZE);
49 } else if (size > sseg_size) {
50 max_low_pfn = min_low_pfn + sseg_size;
51 }
52
53 max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
54
55#ifdef CONFIG_HIGHMEM
56 max_zone_pfn[ZONE_HIGHMEM] = max_pfn;
57
58 highstart_pfn = max_low_pfn;
59 highend_pfn = max_pfn;
60#endif
61 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
62
63 dma_contiguous_reserve(0);
64
65 free_area_init(max_zone_pfn);
66}
67
68void __init setup_arch(char **cmdline_p)
69{
70 *cmdline_p = boot_command_line;
71
72 console_verbose();
73
74 pr_info("Phys. mem: %ldMB\n",
75 (unsigned long) memblock_phys_mem_size()/1024/1024);
76
77 init_mm.start_code = (unsigned long) _stext;
78 init_mm.end_code = (unsigned long) _etext;
79 init_mm.end_data = (unsigned long) _edata;
80 init_mm.brk = (unsigned long) _end;
81
82 parse_early_param();
83
84 csky_memblock_init();
85
86 unflatten_and_copy_device_tree();
87
88#ifdef CONFIG_SMP
89 setup_smp();
90#endif
91
92 sparse_init();
93
94 fixaddr_init();
95
96#ifdef CONFIG_HIGHMEM
97 kmap_init();
98#endif
99}
100
101unsigned long va_pa_offset;
102EXPORT_SYMBOL(va_pa_offset);
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_msa0() & ~(SSEG_SIZE - 1);
111
112 pre_trap_init();
113 pre_mmu_init();
114
115 if (dtb_start == NULL)
116 early_init_dt_scan(__dtb_start);
117 else
118 early_init_dt_scan(dtb_start);
119
120 start_kernel();
121
122 asm volatile("br .\n");
123}