1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/signal.h>
8 #include <linux/sched.h>
9 #include <linux/kernel.h>
10 #include <linux/errno.h>
11 #include <linux/string.h>
12 #include <linux/types.h>
13 #include <linux/pagemap.h>
14 #include <linux/ptrace.h>
15 #include <linux/mman.h>
17 #include <linux/highmem.h>
18 #include <linux/memblock.h>
19 #include <linux/swap.h>
20 #include <linux/proc_fs.h>
21 #include <linux/pfn.h>
22 #include <linux/initrd.h>
24 #include <asm/setup.h>
25 #include <asm/cachectl.h>
27 #include <asm/pgtable.h>
28 #include <asm/pgalloc.h>
29 #include <asm/mmu_context.h>
30 #include <asm/sections.h>
33 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
34 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
35 EXPORT_SYMBOL(invalid_pte_table);
36 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
38 EXPORT_SYMBOL(empty_zero_page);
40 #ifdef CONFIG_BLK_DEV_INITRD
41 static void __init setup_initrd(void)
45 if (initrd_start >= initrd_end) {
46 pr_err("initrd not found or empty");
50 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
51 pr_err("initrd extends beyond end of memory");
55 size = initrd_end - initrd_start;
57 if (memblock_is_region_reserved(__pa(initrd_start), size)) {
58 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region",
59 __pa(initrd_start), size);
63 memblock_reserve(__pa(initrd_start), size);
65 pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
66 (void *)(initrd_start), size);
68 initrd_below_start_ok = 1;
73 initrd_start = initrd_end = 0;
75 pr_err(" - disabling initrd\n");
79 void __init mem_init(void)
84 max_mapnr = highend_pfn;
86 max_mapnr = max_low_pfn;
88 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
90 #ifdef CONFIG_BLK_DEV_INITRD
97 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
98 struct page *page = pfn_to_page(tmp);
100 /* FIXME not sure about */
101 if (!memblock_is_reserved(tmp << PAGE_SHIFT))
102 free_highmem_page(page);
105 mem_init_print_info(NULL);
108 extern char __init_begin[], __init_end[];
110 void free_initmem(void)
114 addr = (unsigned long) &__init_begin;
116 while (addr < (unsigned long) &__init_end) {
117 ClearPageReserved(virt_to_page(addr));
118 init_page_count(virt_to_page(addr));
120 totalram_pages_inc();
124 pr_info("Freeing unused kernel memory: %dk freed\n",
125 ((unsigned int)&__init_end - (unsigned int)&__init_begin) >> 10);
128 void pgd_init(unsigned long *p)
132 for (i = 0; i < PTRS_PER_PGD; i++)
133 p[i] = __pa(invalid_pte_table);
136 void __init pre_mmu_init(void)
139 * Setup page-table and enable TLB-hardrefill
142 pgd_init((unsigned long *)swapper_pg_dir);
143 TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir);
144 TLBMISS_HANDLER_SETUP_PGD_KERNEL(swapper_pg_dir);
146 /* Setup page mask to 4k */
147 write_mmu_pagemask(0);
150 void __init fixrange_init(unsigned long start, unsigned long end,
161 i = __pgd_offset(vaddr);
162 j = __pud_offset(vaddr);
163 k = __pmd_offset(vaddr);
166 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
168 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
170 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
171 if (pmd_none(*pmd)) {
172 pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
174 panic("%s: Failed to allocate %lu bytes align=%lx\n",
178 set_pmd(pmd, __pmd(__pa(pte)));
179 BUG_ON(pte != pte_offset_kernel(pmd, 0));
189 void __init fixaddr_init(void)
193 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
194 fixrange_init(vaddr, vaddr + PMD_SIZE, swapper_pg_dir);