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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166// 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 <asm/sections.h>#include <asm/mmu_context.h>#include <asm/pgalloc.h>
#ifdef CONFIG_BLK_DEV_INITRDstatic void __init setup_initrd(void){ unsigned long size;
if (initrd_start >= initrd_end) { pr_err("initrd not found or empty"); goto disable; }
if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { pr_err("initrd extends beyond end of memory"); goto disable; }
size = initrd_end - initrd_start;
if (memblock_is_region_reserved(__pa(initrd_start), size)) { pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region", __pa(initrd_start), size); goto disable; }
memblock_reserve(__pa(initrd_start), size);
pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n", (void *)(initrd_start), size);
initrd_below_start_ok = 1;
return;
disable: initrd_start = initrd_end = 0;
pr_err(" - disabling initrd\n");}#endif
void __init arch_zone_limits_init(unsigned long *max_zone_pfns){ max_zone_pfns[ZONE_NORMAL] = max_low_pfn;#ifdef CONFIG_HIGHMEM max_zone_pfns[ZONE_HIGHMEM] = max_pfn;#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); 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; }
#ifdef CONFIG_BLK_DEV_INITRD setup_initrd();#endif
mmu_init(min_low_pfn, max_low_pfn);
#ifdef CONFIG_HIGHMEM
highstart_pfn = max_low_pfn; highend_pfn = max_pfn;#endif memblock_set_current_limit(PFN_PHYS(max_low_pfn));
dma_contiguous_reserve(0);}
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
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, __pa(dtb_start)); else early_init_dt_scan(dtb_start, __pa(dtb_start));
start_kernel();
asm volatile("br .\n");}