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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b920de1b77
Add architecture support for the MN10300/AM33 CPUs produced by MEI to the kernel. This patch also adds board support for the ASB2303 with the ASB2308 daughter board, and the ASB2305. The only processor supported is the MN103E010, which is an AM33v2 core plus on-chip devices. [akpm@linux-foundation.org: nuke cvs control strings] Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com> Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
161 lines
4.3 KiB
C
161 lines
4.3 KiB
C
/* MN10300 Memory management initialisation
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*
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* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Modified by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/initrd.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/bootmem.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/dma.h>
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#include <asm/tlb.h>
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#include <asm/sections.h>
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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unsigned long highstart_pfn, highend_pfn;
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/*
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* set up paging
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*/
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void __init paging_init(void)
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{
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unsigned long zones_size[MAX_NR_ZONES] = {0,};
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pte_t *ppte;
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int loop;
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/* main kernel space -> RAM mapping is handled as 1:1 transparent by
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* the MMU */
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memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
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memset(kernel_vmalloc_ptes, 0, sizeof(kernel_vmalloc_ptes));
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/* load the VMALLOC area PTE table addresses into the kernel PGD */
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ppte = kernel_vmalloc_ptes;
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for (loop = VMALLOC_START / (PAGE_SIZE * PTRS_PER_PTE);
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loop < VMALLOC_END / (PAGE_SIZE * PTRS_PER_PTE);
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loop++
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) {
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set_pgd(swapper_pg_dir + loop, __pgd(__pa(ppte) | _PAGE_TABLE));
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ppte += PAGE_SIZE / sizeof(pte_t);
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}
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/* declare the sizes of the RAM zones (only use the normal zone) */
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zones_size[ZONE_NORMAL] =
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(contig_page_data.bdata->node_low_pfn) -
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(contig_page_data.bdata->node_boot_start >> PAGE_SHIFT);
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/* pass the memory from the bootmem allocator to the main allocator */
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free_area_init(zones_size);
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__flush_tlb_all();
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}
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/*
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* transfer all the memory from the bootmem allocator to the runtime allocator
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*/
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void __init mem_init(void)
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{
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int codesize, reservedpages, datasize, initsize;
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int tmp;
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if (!mem_map)
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BUG();
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#define START_PFN (contig_page_data.bdata->node_boot_start >> PAGE_SHIFT)
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#define MAX_LOW_PFN (contig_page_data.bdata->node_low_pfn)
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max_mapnr = num_physpages = MAX_LOW_PFN - START_PFN;
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high_memory = (void *) __va(MAX_LOW_PFN * PAGE_SIZE);
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/* clear the zero-page */
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memset(empty_zero_page, 0, PAGE_SIZE);
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/* this will put all low memory onto the freelists */
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totalram_pages += free_all_bootmem();
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reservedpages = 0;
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for (tmp = 0; tmp < num_physpages; tmp++)
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if (PageReserved(&mem_map[tmp]))
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reservedpages++;
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codesize = (unsigned long) &_etext - (unsigned long) &_stext;
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datasize = (unsigned long) &_edata - (unsigned long) &_etext;
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initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
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printk(KERN_INFO
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"Memory: %luk/%luk available"
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" (%dk kernel code, %dk reserved, %dk data, %dk init,"
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" %ldk highmem)\n",
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(unsigned long) nr_free_pages() << (PAGE_SHIFT - 10),
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max_mapnr << (PAGE_SHIFT - 10),
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codesize >> 10,
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reservedpages << (PAGE_SHIFT - 10),
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datasize >> 10,
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initsize >> 10,
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(unsigned long) (totalhigh_pages << (PAGE_SHIFT - 10))
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);
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}
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/*
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*
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*/
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void free_init_pages(char *what, unsigned long begin, unsigned long end)
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{
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unsigned long addr;
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for (addr = begin; addr < end; addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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memset((void *) addr, 0xcc, PAGE_SIZE);
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free_page(addr);
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totalram_pages++;
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}
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printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
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}
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/*
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* recycle memory containing stuff only required for initialisation
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*/
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void free_initmem(void)
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{
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free_init_pages("unused kernel memory",
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(unsigned long) &__init_begin,
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(unsigned long) &__init_end);
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}
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/*
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* dispose of the memory on which the initial ramdisk resided
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*/
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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free_init_pages("initrd memory", start, end);
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}
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#endif
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