// 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");
|
}
|
