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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * PowerPC version
- * Copyright (C) 1995-1996 Gary Thomas ([email protected])
- *
- * Modifications by Paul Mackerras (PowerMac) ([email protected])
- * and Cort Dougan (PReP) ([email protected])
- * Copyright (C) 1996 Paul Mackerras
- * PPC44x/36-bit changes by Matt Porter ([email protected])
- *
- * Derived from "arch/i386/mm/init.c"
- * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
- */
- #include <linux/module.h>
- #include <linux/sched.h>
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #include <linux/string.h>
- #include <linux/types.h>
- #include <linux/mm.h>
- #include <linux/stddef.h>
- #include <linux/init.h>
- #include <linux/highmem.h>
- #include <linux/initrd.h>
- #include <linux/pagemap.h>
- #include <linux/memblock.h>
- #include <linux/gfp.h>
- #include <linux/slab.h>
- #include <linux/hugetlb.h>
- #include <asm/io.h>
- #include <asm/mmu.h>
- #include <asm/smp.h>
- #include <asm/machdep.h>
- #include <asm/btext.h>
- #include <asm/tlb.h>
- #include <asm/sections.h>
- #include <asm/hugetlb.h>
- #include <asm/kup.h>
- #include <asm/kasan.h>
- #include <mm/mmu_decl.h>
- #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
- /* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */
- #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET))
- #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START"
- #endif
- #endif
- #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE
- phys_addr_t total_memory;
- phys_addr_t total_lowmem;
- #ifdef CONFIG_RELOCATABLE
- /* Used in __va()/__pa() */
- long long virt_phys_offset;
- EXPORT_SYMBOL(virt_phys_offset);
- #endif
- phys_addr_t lowmem_end_addr;
- int boot_mapsize;
- #ifdef CONFIG_PPC_PMAC
- unsigned long agp_special_page;
- EXPORT_SYMBOL(agp_special_page);
- #endif
- void MMU_init(void);
- /* max amount of low RAM to map in */
- unsigned long __max_low_memory = MAX_LOW_MEM;
- /*
- * MMU_init sets up the basic memory mappings for the kernel,
- * including both RAM and possibly some I/O regions,
- * and sets up the page tables and the MMU hardware ready to go.
- */
- void __init MMU_init(void)
- {
- if (ppc_md.progress)
- ppc_md.progress("MMU:enter", 0x111);
- total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr;
- lowmem_end_addr = memstart_addr + total_lowmem;
- #ifdef CONFIG_PPC_85xx
- /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
- * entries, so we need to adjust lowmem to match the amount we can map
- * in the fixed entries */
- adjust_total_lowmem();
- #endif /* CONFIG_PPC_85xx */
- if (total_lowmem > __max_low_memory) {
- total_lowmem = __max_low_memory;
- lowmem_end_addr = memstart_addr + total_lowmem;
- #ifndef CONFIG_HIGHMEM
- total_memory = total_lowmem;
- memblock_enforce_memory_limit(total_lowmem);
- #endif /* CONFIG_HIGHMEM */
- }
- /* Initialize the MMU hardware */
- if (ppc_md.progress)
- ppc_md.progress("MMU:hw init", 0x300);
- MMU_init_hw();
- /* Map in all of RAM starting at KERNELBASE */
- if (ppc_md.progress)
- ppc_md.progress("MMU:mapin", 0x301);
- mapin_ram();
- /* Initialize early top-down ioremap allocator */
- ioremap_bot = IOREMAP_TOP;
- if (ppc_md.progress)
- ppc_md.progress("MMU:exit", 0x211);
- /* From now on, btext is no longer BAT mapped if it was at all */
- #ifdef CONFIG_BOOTX_TEXT
- btext_unmap();
- #endif
- kasan_mmu_init();
- setup_kup();
- /* Shortly after that, the entire linear mapping will be available */
- memblock_set_current_limit(lowmem_end_addr);
- }
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