mirror of https://gitee.com/openkylin/linux.git
256 lines
6.6 KiB
C
256 lines
6.6 KiB
C
/*
|
|
* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
|
|
* Chen Liqin <liqin.chen@sunplusct.com>
|
|
* Lennox Wu <lennox.wu@sunplusct.com>
|
|
* Copyright (C) 2012 Regents of the University of California
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see the file COPYING, or write
|
|
* to the Free Software Foundation, Inc.,
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/initrd.h>
|
|
#include <linux/console.h>
|
|
#include <linux/screen_info.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/sched/task.h>
|
|
#include <linux/swiotlb.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/sbi.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/thread_info.h>
|
|
|
|
#ifdef CONFIG_EARLY_PRINTK
|
|
static void sbi_console_write(struct console *co, const char *buf,
|
|
unsigned int n)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < n; ++i) {
|
|
if (buf[i] == '\n')
|
|
sbi_console_putchar('\r');
|
|
sbi_console_putchar(buf[i]);
|
|
}
|
|
}
|
|
|
|
struct console riscv_sbi_early_console_dev __initdata = {
|
|
.name = "early",
|
|
.write = sbi_console_write,
|
|
.flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
|
|
.index = -1
|
|
};
|
|
#endif
|
|
|
|
#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
|
|
|
|
unsigned long va_pa_offset;
|
|
EXPORT_SYMBOL(va_pa_offset);
|
|
unsigned long pfn_base;
|
|
EXPORT_SYMBOL(pfn_base);
|
|
|
|
unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
|
|
EXPORT_SYMBOL(empty_zero_page);
|
|
|
|
/* The lucky hart to first increment this variable will boot the other cores */
|
|
atomic_t hart_lottery;
|
|
unsigned long boot_cpu_hartid;
|
|
|
|
unsigned long __cpuid_to_hartid_map[NR_CPUS] = {
|
|
[0 ... NR_CPUS-1] = INVALID_HARTID
|
|
};
|
|
|
|
void __init smp_setup_processor_id(void)
|
|
{
|
|
cpuid_to_hartid_map(0) = boot_cpu_hartid;
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
static void __init setup_initrd(void)
|
|
{
|
|
unsigned long size;
|
|
|
|
if (initrd_start >= initrd_end) {
|
|
printk(KERN_INFO "initrd not found or empty");
|
|
goto disable;
|
|
}
|
|
if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
|
|
printk(KERN_ERR "initrd extends beyond end of memory");
|
|
goto disable;
|
|
}
|
|
|
|
size = initrd_end - initrd_start;
|
|
memblock_reserve(__pa(initrd_start), size);
|
|
initrd_below_start_ok = 1;
|
|
|
|
printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n",
|
|
(void *)(initrd_start), size);
|
|
return;
|
|
disable:
|
|
pr_cont(" - disabling initrd\n");
|
|
initrd_start = 0;
|
|
initrd_end = 0;
|
|
}
|
|
#endif /* CONFIG_BLK_DEV_INITRD */
|
|
|
|
pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
|
|
pgd_t trampoline_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
|
|
|
|
#ifndef __PAGETABLE_PMD_FOLDED
|
|
#define NUM_SWAPPER_PMDS ((uintptr_t)-PAGE_OFFSET >> PGDIR_SHIFT)
|
|
pmd_t swapper_pmd[PTRS_PER_PMD*((-PAGE_OFFSET)/PGDIR_SIZE)] __page_aligned_bss;
|
|
pmd_t trampoline_pmd[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
|
|
#endif
|
|
|
|
asmlinkage void __init setup_vm(void)
|
|
{
|
|
extern char _start;
|
|
uintptr_t i;
|
|
uintptr_t pa = (uintptr_t) &_start;
|
|
pgprot_t prot = __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_EXEC);
|
|
|
|
va_pa_offset = PAGE_OFFSET - pa;
|
|
pfn_base = PFN_DOWN(pa);
|
|
|
|
/* Sanity check alignment and size */
|
|
BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
|
|
BUG_ON((pa % (PAGE_SIZE * PTRS_PER_PTE)) != 0);
|
|
|
|
#ifndef __PAGETABLE_PMD_FOLDED
|
|
trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] =
|
|
pfn_pgd(PFN_DOWN((uintptr_t)trampoline_pmd),
|
|
__pgprot(_PAGE_TABLE));
|
|
trampoline_pmd[0] = pfn_pmd(PFN_DOWN(pa), prot);
|
|
|
|
for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) {
|
|
size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i;
|
|
swapper_pg_dir[o] =
|
|
pfn_pgd(PFN_DOWN((uintptr_t)swapper_pmd) + i,
|
|
__pgprot(_PAGE_TABLE));
|
|
}
|
|
for (i = 0; i < ARRAY_SIZE(swapper_pmd); i++)
|
|
swapper_pmd[i] = pfn_pmd(PFN_DOWN(pa + i * PMD_SIZE), prot);
|
|
#else
|
|
trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] =
|
|
pfn_pgd(PFN_DOWN(pa), prot);
|
|
|
|
for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) {
|
|
size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i;
|
|
swapper_pg_dir[o] =
|
|
pfn_pgd(PFN_DOWN(pa + i * PGDIR_SIZE), prot);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void __init parse_dtb(unsigned int hartid, void *dtb)
|
|
{
|
|
early_init_dt_scan(__va(dtb));
|
|
}
|
|
|
|
static void __init setup_bootmem(void)
|
|
{
|
|
struct memblock_region *reg;
|
|
phys_addr_t mem_size = 0;
|
|
|
|
/* Find the memory region containing the kernel */
|
|
for_each_memblock(memory, reg) {
|
|
phys_addr_t vmlinux_end = __pa(_end);
|
|
phys_addr_t end = reg->base + reg->size;
|
|
|
|
if (reg->base <= vmlinux_end && vmlinux_end <= end) {
|
|
/*
|
|
* Reserve from the start of the region to the end of
|
|
* the kernel
|
|
*/
|
|
memblock_reserve(reg->base, vmlinux_end - reg->base);
|
|
mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET);
|
|
}
|
|
}
|
|
BUG_ON(mem_size == 0);
|
|
|
|
set_max_mapnr(PFN_DOWN(mem_size));
|
|
max_low_pfn = memblock_end_of_DRAM();
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
setup_initrd();
|
|
#endif /* CONFIG_BLK_DEV_INITRD */
|
|
|
|
early_init_fdt_reserve_self();
|
|
early_init_fdt_scan_reserved_mem();
|
|
memblock_allow_resize();
|
|
memblock_dump_all();
|
|
|
|
for_each_memblock(memory, reg) {
|
|
unsigned long start_pfn = memblock_region_memory_base_pfn(reg);
|
|
unsigned long end_pfn = memblock_region_memory_end_pfn(reg);
|
|
|
|
memblock_set_node(PFN_PHYS(start_pfn),
|
|
PFN_PHYS(end_pfn - start_pfn),
|
|
&memblock.memory, 0);
|
|
}
|
|
}
|
|
|
|
void __init setup_arch(char **cmdline_p)
|
|
{
|
|
#if defined(CONFIG_EARLY_PRINTK)
|
|
if (likely(early_console == NULL)) {
|
|
early_console = &riscv_sbi_early_console_dev;
|
|
register_console(early_console);
|
|
}
|
|
#endif
|
|
*cmdline_p = boot_command_line;
|
|
|
|
parse_early_param();
|
|
|
|
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;
|
|
|
|
setup_bootmem();
|
|
paging_init();
|
|
unflatten_device_tree();
|
|
|
|
#ifdef CONFIG_SWIOTLB
|
|
swiotlb_init(1);
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
setup_smp();
|
|
#endif
|
|
|
|
#ifdef CONFIG_DUMMY_CONSOLE
|
|
conswitchp = &dummy_con;
|
|
#endif
|
|
|
|
riscv_fill_hwcap();
|
|
}
|
|
|