From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- arch/m68k/mm/init.c | 157 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 157 insertions(+) create mode 100644 arch/m68k/mm/init.c (limited to 'arch/m68k/mm/init.c') diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c new file mode 100644 index 000000000..53040857a --- /dev/null +++ b/arch/m68k/mm/init.c @@ -0,0 +1,157 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/arch/m68k/mm/init.c + * + * Copyright (C) 1995 Hamish Macdonald + * + * Contains common initialization routines, specific init code moved + * to motorola.c and sun3mmu.c + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#ifdef CONFIG_ATARI +#include +#endif +#include +#include + +/* + * ZERO_PAGE is a special page that is used for zero-initialized + * data and COW. + */ +void *empty_zero_page; +EXPORT_SYMBOL(empty_zero_page); + +#ifdef CONFIG_MMU + +pg_data_t pg_data_map[MAX_NUMNODES]; +EXPORT_SYMBOL(pg_data_map); + +int m68k_virt_to_node_shift; + +#ifndef CONFIG_SINGLE_MEMORY_CHUNK +pg_data_t *pg_data_table[65]; +EXPORT_SYMBOL(pg_data_table); +#endif + +void __init m68k_setup_node(int node) +{ +#ifndef CONFIG_SINGLE_MEMORY_CHUNK + struct m68k_mem_info *info = m68k_memory + node; + int i, end; + + i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift(); + end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift(); + for (; i <= end; i++) { + if (pg_data_table[i]) + pr_warn("overlap at %u for chunk %u\n", i, node); + pg_data_table[i] = pg_data_map + node; + } +#endif + node_set_online(node); +} + +#else /* CONFIG_MMU */ + +/* + * paging_init() continues the virtual memory environment setup which + * was begun by the code in arch/head.S. + * The parameters are pointers to where to stick the starting and ending + * addresses of available kernel virtual memory. + */ +void __init paging_init(void) +{ + /* + * Make sure start_mem is page aligned, otherwise bootmem and + * page_alloc get different views of the world. + */ + unsigned long end_mem = memory_end & PAGE_MASK; + unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, }; + + high_memory = (void *) end_mem; + + empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (!empty_zero_page) + panic("%s: Failed to allocate %lu bytes align=0x%lx\n", + __func__, PAGE_SIZE, PAGE_SIZE); + + /* + * Set up SFC/DFC registers (user data space). + */ + set_fs (USER_DS); + + max_zone_pfn[ZONE_DMA] = end_mem >> PAGE_SHIFT; + free_area_init(max_zone_pfn); +} + +#endif /* CONFIG_MMU */ + +void free_initmem(void) +{ +#ifndef CONFIG_MMU_SUN3 + free_initmem_default(-1); +#endif /* CONFIG_MMU_SUN3 */ +} + +#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE) +#define VECTORS &vectors[0] +#else +#define VECTORS _ramvec +#endif + +static inline void init_pointer_tables(void) +{ +#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE) + int i, j; + + /* insert pointer tables allocated so far into the tablelist */ + init_pointer_table(kernel_pg_dir, TABLE_PGD); + for (i = 0; i < PTRS_PER_PGD; i++) { + pud_t *pud = (pud_t *)&kernel_pg_dir[i]; + pmd_t *pmd_dir; + + if (!pud_present(*pud)) + continue; + + pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]); + init_pointer_table(pmd_dir, TABLE_PMD); + + for (j = 0; j < PTRS_PER_PMD; j++) { + pmd_t *pmd = &pmd_dir[j]; + pte_t *pte_dir; + + if (!pmd_present(*pmd)) + continue; + + pte_dir = (pte_t *)pmd_page_vaddr(*pmd); + init_pointer_table(pte_dir, TABLE_PTE); + } + } +#endif +} + +void __init mem_init(void) +{ + /* this will put all memory onto the freelists */ + memblock_free_all(); + init_pointer_tables(); + mem_init_print_info(NULL); +} -- cgit v1.2.3