1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
4 #include <linux/console.h>
5 #include <linux/memblock.h>
6 #include <linux/initrd.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>
16 #ifdef CONFIG_DUMMY_CONSOLE
17 struct screen_info screen_info = {
18 .orig_video_lines = 30,
19 .orig_video_cols = 80,
21 .orig_video_ega_bx = 0,
22 .orig_video_isVGA = 1,
23 .orig_video_points = 8
27 phys_addr_t __init_memblock memblock_end_of_REG0(void)
29 return (memblock.memory.regions[0].base +
30 memblock.memory.regions[0].size);
33 phys_addr_t __init_memblock memblock_start_of_REG1(void)
35 return memblock.memory.regions[1].base;
38 size_t __init_memblock memblock_size_of_REG1(void)
40 return memblock.memory.regions[1].size;
43 static void __init csky_memblock_init(void)
45 unsigned long zone_size[MAX_NR_ZONES];
46 unsigned long zhole_size[MAX_NR_ZONES];
49 memblock_reserve(__pa(_stext), _end - _stext);
50 #ifdef CONFIG_BLK_DEV_INITRD
51 memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
54 early_init_fdt_reserve_self();
55 early_init_fdt_scan_reserved_mem();
59 memset(zone_size, 0, sizeof(zone_size));
60 memset(zhole_size, 0, sizeof(zhole_size));
62 min_low_pfn = PFN_UP(memblock_start_of_DRAM());
63 max_pfn = PFN_DOWN(memblock_end_of_DRAM());
65 max_low_pfn = PFN_UP(memblock_end_of_REG0());
67 max_low_pfn = max_pfn;
69 size = max_pfn - min_low_pfn;
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;
77 if (size <= PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET))
78 zone_size[ZONE_NORMAL] = max_pfn - min_low_pfn;
80 zone_size[ZONE_NORMAL] =
81 PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
82 max_low_pfn = min_low_pfn + zone_size[ZONE_NORMAL];
88 if (memblock.memory.cnt > 1) {
89 size = PFN_DOWN(memblock_size_of_REG1());
90 highstart_pfn = PFN_DOWN(memblock_start_of_REG1());
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);
99 zone_size[ZONE_HIGHMEM] = size;
101 highend_pfn = max_pfn;
103 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
105 dma_contiguous_reserve(0);
107 free_area_init_node(0, zone_size, min_low_pfn, zhole_size);
110 void __init setup_arch(char **cmdline_p)
112 *cmdline_p = boot_command_line;
116 pr_info("Phys. mem: %ldMB\n",
117 (unsigned long) memblock_phys_mem_size()/1024/1024);
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;
126 csky_memblock_init();
128 unflatten_and_copy_device_tree();
136 #ifdef CONFIG_HIGHMEM
140 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
141 conswitchp = &dummy_con;
145 unsigned long va_pa_offset;
146 EXPORT_SYMBOL(va_pa_offset);
148 asmlinkage __visible void __init csky_start(unsigned int unused,
151 /* Clean up bss section */
152 memset(__bss_start, 0, __bss_stop - __bss_start);
154 va_pa_offset = read_mmu_msa0() & ~(SSEG_SIZE - 1);
159 if (dtb_start == NULL)
160 early_init_dt_scan(__dtb_start);
162 early_init_dt_scan(dtb_start);
166 asm volatile("br .\n");