| // 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(_stext), _end - _stext); |
| |
| 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; |
| write_mmu_msa1(read_mmu_msa0() + SSEG_SIZE); |
| } else if (size > sseg_size) { |
| max_low_pfn = min_low_pfn + sseg_size; |
| } |
| |
| max_zone_pfn[ZONE_NORMAL] = 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); |
| |
| init_mm.start_code = (unsigned long) _stext; |
| init_mm.end_code = (unsigned long) _etext; |
| init_mm.end_data = (unsigned long) _edata; |
| init_mm.brk = (unsigned long) _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); |
| |
| 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_msa0() & ~(SSEG_SIZE - 1); |
| |
| pre_trap_init(); |
| pre_mmu_init(); |
| |
| if (dtb_start == NULL) |
| early_init_dt_scan(__dtb_start); |
| else |
| early_init_dt_scan(dtb_start); |
| |
| start_kernel(); |
| |
| asm volatile("br .\n"); |
| } |