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- // 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");
- }
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