1 /* 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 6 * 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. 11 * 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. 16 * 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., 20 */ 21 22 #include <linux/init.h> 23 #include <linux/mm.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> 33 34 #include <asm/setup.h> 35 #include <asm/sections.h> 36 #include <asm/pgtable.h> 37 #include <asm/smp.h> 38 #include <asm/tlbflush.h> 39 #include <asm/thread_info.h> 40 41 #ifdef CONFIG_DUMMY_CONSOLE 42 struct screen_info screen_info = { 43 .orig_video_lines = 30, 44 .orig_video_cols = 80, 45 .orig_video_mode = 0, 46 .orig_video_ega_bx = 0, 47 .orig_video_isVGA = 1, 48 .orig_video_points = 8 49 }; 50 #endif 51 52 unsigned long va_pa_offset; 53 EXPORT_SYMBOL(va_pa_offset); 54 unsigned long pfn_base; 55 EXPORT_SYMBOL(pfn_base); 56 57 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; 58 EXPORT_SYMBOL(empty_zero_page); 59 60 /* The lucky hart to first increment this variable will boot the other cores */ 61 atomic_t hart_lottery; 62 unsigned long boot_cpu_hartid; 63 64 unsigned long __cpuid_to_hartid_map[NR_CPUS] = { 65 [0 ... NR_CPUS-1] = INVALID_HARTID 66 }; 67 68 void __init smp_setup_processor_id(void) 69 { 70 cpuid_to_hartid_map(0) = boot_cpu_hartid; 71 } 72 73 #ifdef CONFIG_BLK_DEV_INITRD 74 static void __init setup_initrd(void) 75 { 76 unsigned long size; 77 78 if (initrd_start >= initrd_end) { 79 printk(KERN_INFO "initrd not found or empty"); 80 goto disable; 81 } 82 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 83 printk(KERN_ERR "initrd extends beyond end of memory"); 84 goto disable; 85 } 86 87 size = initrd_end - initrd_start; 88 memblock_reserve(__pa(initrd_start), size); 89 initrd_below_start_ok = 1; 90 91 printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n", 92 (void *)(initrd_start), size); 93 return; 94 disable: 95 pr_cont(" - disabling initrd\n"); 96 initrd_start = 0; 97 initrd_end = 0; 98 } 99 #endif /* CONFIG_BLK_DEV_INITRD */ 100 101 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 102 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 103 104 #ifndef __PAGETABLE_PMD_FOLDED 105 #define NUM_SWAPPER_PMDS ((uintptr_t)-PAGE_OFFSET >> PGDIR_SHIFT) 106 pmd_t swapper_pmd[PTRS_PER_PMD*((-PAGE_OFFSET)/PGDIR_SIZE)] __page_aligned_bss; 107 pmd_t trampoline_pmd[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 108 #endif 109 110 asmlinkage void __init setup_vm(void) 111 { 112 extern char _start; 113 uintptr_t i; 114 uintptr_t pa = (uintptr_t) &_start; 115 pgprot_t prot = __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_EXEC); 116 117 va_pa_offset = PAGE_OFFSET - pa; 118 pfn_base = PFN_DOWN(pa); 119 120 /* Sanity check alignment and size */ 121 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 122 BUG_ON((pa % (PAGE_SIZE * PTRS_PER_PTE)) != 0); 123 124 #ifndef __PAGETABLE_PMD_FOLDED 125 trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] = 126 pfn_pgd(PFN_DOWN((uintptr_t)trampoline_pmd), 127 __pgprot(_PAGE_TABLE)); 128 trampoline_pmd[0] = pfn_pmd(PFN_DOWN(pa), prot); 129 130 for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) { 131 size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i; 132 swapper_pg_dir[o] = 133 pfn_pgd(PFN_DOWN((uintptr_t)swapper_pmd) + i, 134 __pgprot(_PAGE_TABLE)); 135 } 136 for (i = 0; i < ARRAY_SIZE(swapper_pmd); i++) 137 swapper_pmd[i] = pfn_pmd(PFN_DOWN(pa + i * PMD_SIZE), prot); 138 #else 139 trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] = 140 pfn_pgd(PFN_DOWN(pa), prot); 141 142 for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) { 143 size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i; 144 swapper_pg_dir[o] = 145 pfn_pgd(PFN_DOWN(pa + i * PGDIR_SIZE), prot); 146 } 147 #endif 148 } 149 150 void __init parse_dtb(unsigned int hartid, void *dtb) 151 { 152 early_init_dt_scan(__va(dtb)); 153 } 154 155 static void __init setup_bootmem(void) 156 { 157 struct memblock_region *reg; 158 phys_addr_t mem_size = 0; 159 160 /* Find the memory region containing the kernel */ 161 for_each_memblock(memory, reg) { 162 phys_addr_t vmlinux_end = __pa(_end); 163 phys_addr_t end = reg->base + reg->size; 164 165 if (reg->base <= vmlinux_end && vmlinux_end <= end) { 166 /* 167 * Reserve from the start of the region to the end of 168 * the kernel 169 */ 170 memblock_reserve(reg->base, vmlinux_end - reg->base); 171 mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET); 172 } 173 } 174 BUG_ON(mem_size == 0); 175 176 set_max_mapnr(PFN_DOWN(mem_size)); 177 max_low_pfn = memblock_end_of_DRAM(); 178 179 #ifdef CONFIG_BLK_DEV_INITRD 180 setup_initrd(); 181 #endif /* CONFIG_BLK_DEV_INITRD */ 182 183 early_init_fdt_reserve_self(); 184 early_init_fdt_scan_reserved_mem(); 185 memblock_allow_resize(); 186 memblock_dump_all(); 187 188 for_each_memblock(memory, reg) { 189 unsigned long start_pfn = memblock_region_memory_base_pfn(reg); 190 unsigned long end_pfn = memblock_region_memory_end_pfn(reg); 191 192 memblock_set_node(PFN_PHYS(start_pfn), 193 PFN_PHYS(end_pfn - start_pfn), 194 &memblock.memory, 0); 195 } 196 } 197 198 void __init setup_arch(char **cmdline_p) 199 { 200 *cmdline_p = boot_command_line; 201 202 parse_early_param(); 203 204 init_mm.start_code = (unsigned long) _stext; 205 init_mm.end_code = (unsigned long) _etext; 206 init_mm.end_data = (unsigned long) _edata; 207 init_mm.brk = (unsigned long) _end; 208 209 setup_bootmem(); 210 paging_init(); 211 unflatten_device_tree(); 212 213 #ifdef CONFIG_SWIOTLB 214 swiotlb_init(1); 215 #endif 216 217 #ifdef CONFIG_SMP 218 setup_smp(); 219 #endif 220 221 #ifdef CONFIG_DUMMY_CONSOLE 222 conswitchp = &dummy_con; 223 #endif 224 225 riscv_fill_hwcap(); 226 } 227 228