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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/m68k/mm/init.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | arch/m68k/mm/init.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c new file mode 100644 index 000000000..1b47bec15 --- /dev/null +++ b/arch/m68k/mm/init.c @@ -0,0 +1,130 @@ +// 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 <linux/module.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/memblock.h> +#include <linux/gfp.h> + +#include <asm/setup.h> +#include <linux/uaccess.h> +#include <asm/page.h> +#include <asm/pgalloc.h> +#include <asm/traps.h> +#include <asm/machdep.h> +#include <asm/io.h> +#ifdef CONFIG_ATARI +#include <asm/atari_stram.h> +#endif +#include <asm/sections.h> +#include <asm/tlb.h> + +/* + * 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 + +int m68k_virt_to_node_shift; + +void __init m68k_setup_node(int node) +{ + 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); + 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(); +} |