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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 <asm/sections.h>
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>
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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