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