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137 lines
2.8 KiB
137 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
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#include <linux/console.h> |
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#include <linux/memblock.h> |
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#include <linux/initrd.h> |
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#include <linux/of.h> |
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#include <linux/of_fdt.h> |
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#include <linux/start_kernel.h> |
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#include <linux/dma-map-ops.h> |
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#include <linux/screen_info.h> |
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#include <asm/sections.h> |
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#include <asm/mmu_context.h> |
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#include <asm/pgalloc.h> |
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#ifdef CONFIG_DUMMY_CONSOLE |
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struct screen_info screen_info = { |
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.orig_video_lines = 30, |
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.orig_video_cols = 80, |
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.orig_video_mode = 0, |
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.orig_video_ega_bx = 0, |
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.orig_video_isVGA = 1, |
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.orig_video_points = 8 |
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}; |
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#endif |
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static void __init csky_memblock_init(void) |
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{ |
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unsigned long lowmem_size = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET); |
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unsigned long sseg_size = PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET); |
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unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 }; |
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signed long size; |
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memblock_reserve(__pa(_stext), _end - _stext); |
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early_init_fdt_reserve_self(); |
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early_init_fdt_scan_reserved_mem(); |
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memblock_dump_all(); |
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min_low_pfn = PFN_UP(memblock_start_of_DRAM()); |
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max_low_pfn = max_pfn = PFN_DOWN(memblock_end_of_DRAM()); |
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size = max_pfn - min_low_pfn; |
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if (size >= lowmem_size) { |
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max_low_pfn = min_low_pfn + lowmem_size; |
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#ifdef CONFIG_PAGE_OFFSET_80000000 |
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write_mmu_msa1(read_mmu_msa0() + SSEG_SIZE); |
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#endif |
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} else if (size > sseg_size) { |
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max_low_pfn = min_low_pfn + sseg_size; |
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} |
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max_zone_pfn[ZONE_NORMAL] = max_low_pfn; |
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mmu_init(min_low_pfn, max_low_pfn); |
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#ifdef CONFIG_HIGHMEM |
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max_zone_pfn[ZONE_HIGHMEM] = max_pfn; |
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highstart_pfn = max_low_pfn; |
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highend_pfn = max_pfn; |
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#endif |
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memblock_set_current_limit(PFN_PHYS(max_low_pfn)); |
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dma_contiguous_reserve(0); |
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free_area_init(max_zone_pfn); |
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} |
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void __init setup_arch(char **cmdline_p) |
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{ |
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*cmdline_p = boot_command_line; |
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console_verbose(); |
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pr_info("Phys. mem: %ldMB\n", |
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(unsigned long) memblock_phys_mem_size()/1024/1024); |
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init_mm.start_code = (unsigned long) _stext; |
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init_mm.end_code = (unsigned long) _etext; |
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init_mm.end_data = (unsigned long) _edata; |
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init_mm.brk = (unsigned long) _end; |
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parse_early_param(); |
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csky_memblock_init(); |
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unflatten_and_copy_device_tree(); |
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#ifdef CONFIG_SMP |
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setup_smp(); |
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#endif |
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sparse_init(); |
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fixaddr_init(); |
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#ifdef CONFIG_HIGHMEM |
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kmap_init(); |
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#endif |
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} |
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unsigned long va_pa_offset; |
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EXPORT_SYMBOL(va_pa_offset); |
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static inline unsigned long read_mmu_msa(void) |
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{ |
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#ifdef CONFIG_PAGE_OFFSET_80000000 |
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return read_mmu_msa0(); |
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#endif |
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#ifdef CONFIG_PAGE_OFFSET_A0000000 |
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return read_mmu_msa1(); |
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#endif |
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} |
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asmlinkage __visible void __init csky_start(unsigned int unused, |
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void *dtb_start) |
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{ |
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/* Clean up bss section */ |
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memset(__bss_start, 0, __bss_stop - __bss_start); |
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va_pa_offset = read_mmu_msa() & ~(SSEG_SIZE - 1); |
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pre_trap_init(); |
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if (dtb_start == NULL) |
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early_init_dt_scan(__dtb_start); |
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else |
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early_init_dt_scan(dtb_start); |
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start_kernel(); |
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asm volatile("br .\n"); |
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}
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