245 lines
6.4 KiB
C
245 lines
6.4 KiB
C
/*
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* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
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* Chen Liqin <liqin.chen@sunplusct.com>
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* Lennox Wu <lennox.wu@sunplusct.com>
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* Copyright (C) 2012 Regents of the University of California
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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*/
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#include <linux/bootmem.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/memblock.h>
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#include <linux/sched.h>
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#include <linux/initrd.h>
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#include <linux/console.h>
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#include <linux/screen_info.h>
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#include <linux/of_fdt.h>
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#include <linux/of_platform.h>
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#include <linux/sched/task.h>
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#include <linux/swiotlb.h>
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#include <asm/setup.h>
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#include <asm/sections.h>
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#include <asm/pgtable.h>
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#include <asm/smp.h>
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#include <asm/sbi.h>
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#include <asm/tlbflush.h>
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#include <asm/thread_info.h>
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#ifdef CONFIG_EARLY_PRINTK
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static void sbi_console_write(struct console *co, const char *buf,
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unsigned int n)
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{
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int i;
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for (i = 0; i < n; ++i) {
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if (buf[i] == '\n')
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sbi_console_putchar('\r');
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sbi_console_putchar(buf[i]);
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}
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}
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struct console riscv_sbi_early_console_dev __initdata = {
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.name = "early",
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.write = sbi_console_write,
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.flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
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.index = -1
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};
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#endif
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#ifdef CONFIG_DUMMY_CONSOLE
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struct screen_info screen_info = {
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.orig_video_lines = 30,
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.orig_video_cols = 80,
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.orig_video_mode = 0,
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.orig_video_ega_bx = 0,
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.orig_video_isVGA = 1,
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.orig_video_points = 8
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};
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#endif
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unsigned long va_pa_offset;
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EXPORT_SYMBOL(va_pa_offset);
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unsigned long pfn_base;
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EXPORT_SYMBOL(pfn_base);
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unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
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EXPORT_SYMBOL(empty_zero_page);
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/* The lucky hart to first increment this variable will boot the other cores */
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atomic_t hart_lottery;
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#ifdef CONFIG_BLK_DEV_INITRD
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static void __init setup_initrd(void)
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{
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unsigned long size;
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if (initrd_start >= initrd_end) {
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printk(KERN_INFO "initrd not found or empty");
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goto disable;
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}
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if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
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printk(KERN_ERR "initrd extends beyond end of memory");
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goto disable;
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}
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size = initrd_end - initrd_start;
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memblock_reserve(__pa(initrd_start), size);
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initrd_below_start_ok = 1;
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printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n",
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(void *)(initrd_start), size);
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return;
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disable:
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pr_cont(" - disabling initrd\n");
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initrd_start = 0;
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initrd_end = 0;
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
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pgd_t trampoline_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
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#ifndef __PAGETABLE_PMD_FOLDED
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#define NUM_SWAPPER_PMDS ((uintptr_t)-PAGE_OFFSET >> PGDIR_SHIFT)
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pmd_t swapper_pmd[PTRS_PER_PMD*((-PAGE_OFFSET)/PGDIR_SIZE)] __page_aligned_bss;
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pmd_t trampoline_pmd[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
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#endif
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asmlinkage void __init setup_vm(void)
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{
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extern char _start;
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uintptr_t i;
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uintptr_t pa = (uintptr_t) &_start;
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pgprot_t prot = __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_EXEC);
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va_pa_offset = PAGE_OFFSET - pa;
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pfn_base = PFN_DOWN(pa);
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/* Sanity check alignment and size */
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BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
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BUG_ON((pa % (PAGE_SIZE * PTRS_PER_PTE)) != 0);
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#ifndef __PAGETABLE_PMD_FOLDED
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trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] =
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pfn_pgd(PFN_DOWN((uintptr_t)trampoline_pmd),
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__pgprot(_PAGE_TABLE));
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trampoline_pmd[0] = pfn_pmd(PFN_DOWN(pa), prot);
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for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) {
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size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i;
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swapper_pg_dir[o] =
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pfn_pgd(PFN_DOWN((uintptr_t)swapper_pmd) + i,
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__pgprot(_PAGE_TABLE));
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}
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for (i = 0; i < ARRAY_SIZE(swapper_pmd); i++)
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swapper_pmd[i] = pfn_pmd(PFN_DOWN(pa + i * PMD_SIZE), prot);
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#else
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trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] =
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pfn_pgd(PFN_DOWN(pa), prot);
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for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) {
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size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i;
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swapper_pg_dir[o] =
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pfn_pgd(PFN_DOWN(pa + i * PGDIR_SIZE), prot);
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}
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#endif
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}
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void __init parse_dtb(unsigned int hartid, void *dtb)
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{
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early_init_dt_scan(__va(dtb));
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}
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static void __init setup_bootmem(void)
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{
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struct memblock_region *reg;
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phys_addr_t mem_size = 0;
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/* Find the memory region containing the kernel */
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for_each_memblock(memory, reg) {
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phys_addr_t vmlinux_end = __pa(_end);
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phys_addr_t end = reg->base + reg->size;
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if (reg->base <= vmlinux_end && vmlinux_end <= end) {
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/*
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* Reserve from the start of the region to the end of
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* the kernel
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*/
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memblock_reserve(reg->base, vmlinux_end - reg->base);
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mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET);
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}
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}
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BUG_ON(mem_size == 0);
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set_max_mapnr(PFN_DOWN(mem_size));
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max_low_pfn = PFN_DOWN(memblock_end_of_DRAM());
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max_pfn = max_low_pfn;
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#ifdef CONFIG_BLK_DEV_INITRD
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setup_initrd();
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#endif /* CONFIG_BLK_DEV_INITRD */
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early_init_fdt_reserve_self();
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early_init_fdt_scan_reserved_mem();
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memblock_allow_resize();
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memblock_dump_all();
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for_each_memblock(memory, reg) {
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unsigned long start_pfn = memblock_region_memory_base_pfn(reg);
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unsigned long end_pfn = memblock_region_memory_end_pfn(reg);
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memblock_set_node(PFN_PHYS(start_pfn),
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PFN_PHYS(end_pfn - start_pfn),
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&memblock.memory, 0);
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}
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}
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void __init setup_arch(char **cmdline_p)
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{
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#if defined(CONFIG_EARLY_PRINTK)
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if (likely(early_console == NULL)) {
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early_console = &riscv_sbi_early_console_dev;
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register_console(early_console);
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}
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#endif
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*cmdline_p = boot_command_line;
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parse_early_param();
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init_mm.start_code = (unsigned long) _stext;
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init_mm.end_code = (unsigned long) _etext;
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init_mm.end_data = (unsigned long) _edata;
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init_mm.brk = (unsigned long) _end;
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setup_bootmem();
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paging_init();
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unflatten_device_tree();
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swiotlb_init(1);
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#ifdef CONFIG_SMP
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setup_smp();
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#endif
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#ifdef CONFIG_DUMMY_CONSOLE
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conswitchp = &dummy_con;
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#endif
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riscv_fill_hwcap();
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}
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