| // 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-contiguous.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 |
| |
| phys_addr_t __init_memblock memblock_end_of_REG0(void) |
| { |
| return (memblock.memory.regions[0].base + |
| memblock.memory.regions[0].size); |
| } |
| |
| phys_addr_t __init_memblock memblock_start_of_REG1(void) |
| { |
| return memblock.memory.regions[1].base; |
| } |
| |
| size_t __init_memblock memblock_size_of_REG1(void) |
| { |
| return memblock.memory.regions[1].size; |
| } |
| |
| static void __init csky_memblock_init(void) |
| { |
| unsigned long zone_size[MAX_NR_ZONES]; |
| unsigned long zhole_size[MAX_NR_ZONES]; |
| signed long size; |
| |
| memblock_reserve(__pa(_stext), _end - _stext); |
| |
| early_init_fdt_reserve_self(); |
| early_init_fdt_scan_reserved_mem(); |
| |
| memblock_dump_all(); |
| |
| memset(zone_size, 0, sizeof(zone_size)); |
| memset(zhole_size, 0, sizeof(zhole_size)); |
| |
| min_low_pfn = PFN_UP(memblock_start_of_DRAM()); |
| max_pfn = PFN_DOWN(memblock_end_of_DRAM()); |
| |
| max_low_pfn = PFN_UP(memblock_end_of_REG0()); |
| if (max_low_pfn == 0) |
| max_low_pfn = max_pfn; |
| |
| size = max_pfn - min_low_pfn; |
| |
| if (memblock.memory.cnt > 1) { |
| zone_size[ZONE_NORMAL] = |
| PFN_DOWN(memblock_start_of_REG1()) - min_low_pfn; |
| zhole_size[ZONE_NORMAL] = |
| PFN_DOWN(memblock_start_of_REG1()) - max_low_pfn; |
| } else { |
| if (size <= PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET)) |
| zone_size[ZONE_NORMAL] = max_pfn - min_low_pfn; |
| else { |
| zone_size[ZONE_NORMAL] = |
| PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET); |
| max_low_pfn = min_low_pfn + zone_size[ZONE_NORMAL]; |
| } |
| } |
| |
| #ifdef CONFIG_HIGHMEM |
| size = 0; |
| if (memblock.memory.cnt > 1) { |
| size = PFN_DOWN(memblock_size_of_REG1()); |
| highstart_pfn = PFN_DOWN(memblock_start_of_REG1()); |
| } else { |
| size = max_pfn - min_low_pfn - |
| PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET); |
| highstart_pfn = min_low_pfn + |
| PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET); |
| } |
| |
| if (size > 0) |
| zone_size[ZONE_HIGHMEM] = size; |
| |
| highend_pfn = max_pfn; |
| #endif |
| memblock_set_current_limit(PFN_PHYS(max_low_pfn)); |
| |
| dma_contiguous_reserve(0); |
| |
| free_area_init_node(0, zone_size, min_low_pfn, zhole_size); |
| } |
| |
| 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"); |
| } |