2 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
3 * Chen Liqin <liqin.chen@sunplusct.com>
4 * Lennox Wu <lennox.wu@sunplusct.com>
5 * Copyright (C) 2012 Regents of the University of California
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see the file COPYING, or write
19 * to the Free Software Foundation, Inc.,
22 #include <linux/init.h>
24 #include <linux/memblock.h>
25 #include <linux/sched.h>
26 #include <linux/initrd.h>
27 #include <linux/console.h>
28 #include <linux/screen_info.h>
29 #include <linux/of_fdt.h>
30 #include <linux/of_platform.h>
31 #include <linux/sched/task.h>
32 #include <linux/swiotlb.h>
34 #include <asm/setup.h>
35 #include <asm/sections.h>
36 #include <asm/pgtable.h>
39 #include <asm/tlbflush.h>
40 #include <asm/thread_info.h>
42 #ifdef CONFIG_EARLY_PRINTK
43 static void sbi_console_write(struct console *co, const char *buf,
48 for (i = 0; i < n; ++i) {
50 sbi_console_putchar('\r');
51 sbi_console_putchar(buf[i]);
55 struct console riscv_sbi_early_console_dev __initdata = {
57 .write = sbi_console_write,
58 .flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
63 #ifdef CONFIG_DUMMY_CONSOLE
64 struct screen_info screen_info = {
65 .orig_video_lines = 30,
66 .orig_video_cols = 80,
68 .orig_video_ega_bx = 0,
69 .orig_video_isVGA = 1,
70 .orig_video_points = 8
74 unsigned long va_pa_offset;
75 EXPORT_SYMBOL(va_pa_offset);
76 unsigned long pfn_base;
77 EXPORT_SYMBOL(pfn_base);
79 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
80 EXPORT_SYMBOL(empty_zero_page);
82 /* The lucky hart to first increment this variable will boot the other cores */
83 atomic_t hart_lottery;
85 #ifdef CONFIG_BLK_DEV_INITRD
86 static void __init setup_initrd(void)
90 if (initrd_start >= initrd_end) {
91 printk(KERN_INFO "initrd not found or empty");
94 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
95 printk(KERN_ERR "initrd extends beyond end of memory");
99 size = initrd_end - initrd_start;
100 memblock_reserve(__pa(initrd_start), size);
101 initrd_below_start_ok = 1;
103 printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n",
104 (void *)(initrd_start), size);
107 pr_cont(" - disabling initrd\n");
111 #endif /* CONFIG_BLK_DEV_INITRD */
113 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
114 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
116 #ifndef __PAGETABLE_PMD_FOLDED
117 #define NUM_SWAPPER_PMDS ((uintptr_t)-PAGE_OFFSET >> PGDIR_SHIFT)
118 pmd_t swapper_pmd[PTRS_PER_PMD*((-PAGE_OFFSET)/PGDIR_SIZE)] __page_aligned_bss;
119 pmd_t trampoline_pmd[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
122 asmlinkage void __init setup_vm(void)
126 uintptr_t pa = (uintptr_t) &_start;
127 pgprot_t prot = __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_EXEC);
129 va_pa_offset = PAGE_OFFSET - pa;
130 pfn_base = PFN_DOWN(pa);
132 /* Sanity check alignment and size */
133 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
134 BUG_ON((pa % (PAGE_SIZE * PTRS_PER_PTE)) != 0);
136 #ifndef __PAGETABLE_PMD_FOLDED
137 trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] =
138 pfn_pgd(PFN_DOWN((uintptr_t)trampoline_pmd),
139 __pgprot(_PAGE_TABLE));
140 trampoline_pmd[0] = pfn_pmd(PFN_DOWN(pa), prot);
142 for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) {
143 size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i;
145 pfn_pgd(PFN_DOWN((uintptr_t)swapper_pmd) + i,
146 __pgprot(_PAGE_TABLE));
148 for (i = 0; i < ARRAY_SIZE(swapper_pmd); i++)
149 swapper_pmd[i] = pfn_pmd(PFN_DOWN(pa + i * PMD_SIZE), prot);
151 trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] =
152 pfn_pgd(PFN_DOWN(pa), prot);
154 for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) {
155 size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i;
157 pfn_pgd(PFN_DOWN(pa + i * PGDIR_SIZE), prot);
162 void __init parse_dtb(unsigned int hartid, void *dtb)
164 early_init_dt_scan(__va(dtb));
167 static void __init setup_bootmem(void)
169 struct memblock_region *reg;
170 phys_addr_t mem_size = 0;
172 /* Find the memory region containing the kernel */
173 for_each_memblock(memory, reg) {
174 phys_addr_t vmlinux_end = __pa(_end);
175 phys_addr_t end = reg->base + reg->size;
177 if (reg->base <= vmlinux_end && vmlinux_end <= end) {
179 * Reserve from the start of the region to the end of
182 memblock_reserve(reg->base, vmlinux_end - reg->base);
183 mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET);
186 BUG_ON(mem_size == 0);
188 set_max_mapnr(PFN_DOWN(mem_size));
189 max_low_pfn = pfn_base + PFN_DOWN(mem_size);
191 #ifdef CONFIG_BLK_DEV_INITRD
193 #endif /* CONFIG_BLK_DEV_INITRD */
195 early_init_fdt_reserve_self();
196 early_init_fdt_scan_reserved_mem();
197 memblock_allow_resize();
200 for_each_memblock(memory, reg) {
201 unsigned long start_pfn = memblock_region_memory_base_pfn(reg);
202 unsigned long end_pfn = memblock_region_memory_end_pfn(reg);
204 memblock_set_node(PFN_PHYS(start_pfn),
205 PFN_PHYS(end_pfn - start_pfn),
206 &memblock.memory, 0);
210 void __init setup_arch(char **cmdline_p)
212 #if defined(CONFIG_EARLY_PRINTK)
213 if (likely(early_console == NULL)) {
214 early_console = &riscv_sbi_early_console_dev;
215 register_console(early_console);
218 *cmdline_p = boot_command_line;
222 init_mm.start_code = (unsigned long) _stext;
223 init_mm.end_code = (unsigned long) _etext;
224 init_mm.end_data = (unsigned long) _edata;
225 init_mm.brk = (unsigned long) _end;
229 unflatten_device_tree();
236 #ifdef CONFIG_DUMMY_CONSOLE
237 conswitchp = &dummy_con;