^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/arch/m68k/mm/init.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1995 Hamish Macdonald
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Contains common initialization routines, specific init code moved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * to motorola.c and sun3mmu.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <asm/pgalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/traps.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/machdep.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #ifdef CONFIG_ATARI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <asm/atari_stram.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <asm/tlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * ZERO_PAGE is a special page that is used for zero-initialized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * data and COW.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) void *empty_zero_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) EXPORT_SYMBOL(empty_zero_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #ifdef CONFIG_MMU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) pg_data_t pg_data_map[MAX_NUMNODES];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) EXPORT_SYMBOL(pg_data_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) int m68k_virt_to_node_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #ifndef CONFIG_SINGLE_MEMORY_CHUNK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) pg_data_t *pg_data_table[65];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) EXPORT_SYMBOL(pg_data_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) void __init m68k_setup_node(int node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #ifndef CONFIG_SINGLE_MEMORY_CHUNK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct m68k_mem_info *info = m68k_memory + node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) int i, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) for (; i <= end; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (pg_data_table[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) pr_warn("overlap at %u for chunk %u\n", i, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) pg_data_table[i] = pg_data_map + node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) node_set_online(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #else /* CONFIG_MMU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * paging_init() continues the virtual memory environment setup which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * was begun by the code in arch/head.S.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * The parameters are pointers to where to stick the starting and ending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * addresses of available kernel virtual memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) void __init paging_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * Make sure start_mem is page aligned, otherwise bootmem and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * page_alloc get different views of the world.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) unsigned long end_mem = memory_end & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) high_memory = (void *) end_mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (!empty_zero_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) __func__, PAGE_SIZE, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * Set up SFC/DFC registers (user data space).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) set_fs (USER_DS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) max_zone_pfn[ZONE_DMA] = end_mem >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) free_area_init(max_zone_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #endif /* CONFIG_MMU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) void free_initmem(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #ifndef CONFIG_MMU_SUN3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) free_initmem_default(-1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) #endif /* CONFIG_MMU_SUN3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) #define VECTORS &vectors[0]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #define VECTORS _ramvec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static inline void init_pointer_tables(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) #if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) int i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /* insert pointer tables allocated so far into the tablelist */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) init_pointer_table(kernel_pg_dir, TABLE_PGD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) for (i = 0; i < PTRS_PER_PGD; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) pud_t *pud = (pud_t *)&kernel_pg_dir[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) pmd_t *pmd_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (!pud_present(*pud))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) init_pointer_table(pmd_dir, TABLE_PMD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) for (j = 0; j < PTRS_PER_PMD; j++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) pmd_t *pmd = &pmd_dir[j];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) pte_t *pte_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (!pmd_present(*pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) pte_dir = (pte_t *)pmd_page_vaddr(*pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) init_pointer_table(pte_dir, TABLE_PTE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) void __init mem_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /* this will put all memory onto the freelists */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) memblock_free_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) init_pointer_tables();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) mem_init_print_info(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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