// 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; #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); 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); 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"); }