349 lines
8.7 KiB
C
349 lines
8.7 KiB
C
/*
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* linux/arch/sparc/mm/init.c
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
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* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (C) 2000 Anton Blanchard (anton@samba.org)
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*/
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#include <linux/module.h>
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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/mm.h>
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#include <linux/swap.h>
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#include <linux/initrd.h>
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#include <linux/init.h>
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#include <linux/highmem.h>
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#include <linux/bootmem.h>
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#include <linux/pagemap.h>
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#include <linux/poison.h>
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#include <linux/gfp.h>
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#include <asm/sections.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/vaddrs.h>
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#include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
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#include <asm/setup.h>
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#include <asm/tlb.h>
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#include <asm/prom.h>
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#include <asm/leon.h>
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#include "mm_32.h"
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unsigned long *sparc_valid_addr_bitmap;
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EXPORT_SYMBOL(sparc_valid_addr_bitmap);
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unsigned long phys_base;
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EXPORT_SYMBOL(phys_base);
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unsigned long pfn_base;
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EXPORT_SYMBOL(pfn_base);
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struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
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/* Initial ramdisk setup */
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extern unsigned int sparc_ramdisk_image;
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extern unsigned int sparc_ramdisk_size;
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unsigned long highstart_pfn, highend_pfn;
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unsigned long last_valid_pfn;
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unsigned long calc_highpages(void)
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{
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int i;
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int nr = 0;
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for (i = 0; sp_banks[i].num_bytes != 0; i++) {
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unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
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unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
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if (end_pfn <= max_low_pfn)
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continue;
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if (start_pfn < max_low_pfn)
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start_pfn = max_low_pfn;
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nr += end_pfn - start_pfn;
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}
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return nr;
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}
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static unsigned long calc_max_low_pfn(void)
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{
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int i;
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unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
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unsigned long curr_pfn, last_pfn;
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last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
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for (i = 1; sp_banks[i].num_bytes != 0; i++) {
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curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
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if (curr_pfn >= tmp) {
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if (last_pfn < tmp)
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tmp = last_pfn;
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break;
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}
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last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
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}
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return tmp;
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}
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unsigned long __init bootmem_init(unsigned long *pages_avail)
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{
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unsigned long bootmap_size, start_pfn;
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unsigned long end_of_phys_memory = 0UL;
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unsigned long bootmap_pfn, bytes_avail, size;
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int i;
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bytes_avail = 0UL;
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for (i = 0; sp_banks[i].num_bytes != 0; i++) {
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end_of_phys_memory = sp_banks[i].base_addr +
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sp_banks[i].num_bytes;
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bytes_avail += sp_banks[i].num_bytes;
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if (cmdline_memory_size) {
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if (bytes_avail > cmdline_memory_size) {
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unsigned long slack = bytes_avail - cmdline_memory_size;
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bytes_avail -= slack;
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end_of_phys_memory -= slack;
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sp_banks[i].num_bytes -= slack;
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if (sp_banks[i].num_bytes == 0) {
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sp_banks[i].base_addr = 0xdeadbeef;
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} else {
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sp_banks[i+1].num_bytes = 0;
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sp_banks[i+1].base_addr = 0xdeadbeef;
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}
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break;
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}
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}
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}
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/* Start with page aligned address of last symbol in kernel
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* image.
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*/
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start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
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/* Now shift down to get the real physical page frame number. */
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start_pfn >>= PAGE_SHIFT;
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bootmap_pfn = start_pfn;
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max_pfn = end_of_phys_memory >> PAGE_SHIFT;
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max_low_pfn = max_pfn;
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highstart_pfn = highend_pfn = max_pfn;
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if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
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highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
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max_low_pfn = calc_max_low_pfn();
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printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
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calc_highpages() >> (20 - PAGE_SHIFT));
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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/* Now have to check initial ramdisk, so that bootmap does not overwrite it */
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if (sparc_ramdisk_image) {
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if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
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sparc_ramdisk_image -= KERNBASE;
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initrd_start = sparc_ramdisk_image + phys_base;
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initrd_end = initrd_start + sparc_ramdisk_size;
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if (initrd_end > end_of_phys_memory) {
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printk(KERN_CRIT "initrd extends beyond end of memory "
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"(0x%016lx > 0x%016lx)\ndisabling initrd\n",
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initrd_end, end_of_phys_memory);
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initrd_start = 0;
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}
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if (initrd_start) {
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if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
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initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
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bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
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}
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}
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#endif
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/* Initialize the boot-time allocator. */
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bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
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max_low_pfn);
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/* Now register the available physical memory with the
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* allocator.
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*/
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*pages_avail = 0;
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for (i = 0; sp_banks[i].num_bytes != 0; i++) {
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unsigned long curr_pfn, last_pfn;
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curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
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if (curr_pfn >= max_low_pfn)
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break;
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last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
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if (last_pfn > max_low_pfn)
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last_pfn = max_low_pfn;
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/*
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* .. finally, did all the rounding and playing
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* around just make the area go away?
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*/
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if (last_pfn <= curr_pfn)
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continue;
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size = (last_pfn - curr_pfn) << PAGE_SHIFT;
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*pages_avail += last_pfn - curr_pfn;
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free_bootmem(sp_banks[i].base_addr, size);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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if (initrd_start) {
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/* Reserve the initrd image area. */
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size = initrd_end - initrd_start;
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reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
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*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
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initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
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initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
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}
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#endif
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/* Reserve the kernel text/data/bss. */
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size = (start_pfn << PAGE_SHIFT) - phys_base;
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reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
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*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
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/* Reserve the bootmem map. We do not account for it
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* in pages_avail because we will release that memory
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* in free_all_bootmem.
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*/
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size = bootmap_size;
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reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
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*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
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return max_pfn;
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}
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/*
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* paging_init() sets up the page tables: We call the MMU specific
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* init routine based upon the Sun model type on the Sparc.
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*
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*/
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void __init paging_init(void)
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{
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srmmu_paging_init();
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prom_build_devicetree();
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of_fill_in_cpu_data();
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device_scan();
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}
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static void __init taint_real_pages(void)
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{
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int i;
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for (i = 0; sp_banks[i].num_bytes; i++) {
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unsigned long start, end;
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start = sp_banks[i].base_addr;
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end = start + sp_banks[i].num_bytes;
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while (start < end) {
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set_bit(start >> 20, sparc_valid_addr_bitmap);
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start += PAGE_SIZE;
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}
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}
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}
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static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
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{
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unsigned long tmp;
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#ifdef CONFIG_DEBUG_HIGHMEM
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printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
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#endif
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for (tmp = start_pfn; tmp < end_pfn; tmp++)
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free_highmem_page(pfn_to_page(tmp));
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}
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void __init mem_init(void)
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{
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int i;
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if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
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prom_printf("BUG: fixmap and pkmap areas overlap\n");
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prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
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PKMAP_BASE,
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(unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
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FIXADDR_START);
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prom_printf("Please mail sparclinux@vger.kernel.org.\n");
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prom_halt();
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}
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/* Saves us work later. */
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memset((void *)&empty_zero_page, 0, PAGE_SIZE);
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i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
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i += 1;
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sparc_valid_addr_bitmap = (unsigned long *)
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__alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
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if (sparc_valid_addr_bitmap == NULL) {
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prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
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prom_halt();
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}
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memset(sparc_valid_addr_bitmap, 0, i << 2);
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taint_real_pages();
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max_mapnr = last_valid_pfn - pfn_base;
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high_memory = __va(max_low_pfn << PAGE_SHIFT);
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free_all_bootmem();
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for (i = 0; sp_banks[i].num_bytes != 0; i++) {
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unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
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unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
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if (end_pfn <= highstart_pfn)
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continue;
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if (start_pfn < highstart_pfn)
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start_pfn = highstart_pfn;
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map_high_region(start_pfn, end_pfn);
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}
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mem_init_print_info(NULL);
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}
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void free_initmem (void)
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{
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free_initmem_default(POISON_FREE_INITMEM);
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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_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
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"initrd");
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}
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#endif
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void sparc_flush_page_to_ram(struct page *page)
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{
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unsigned long vaddr = (unsigned long)page_address(page);
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if (vaddr)
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__flush_page_to_ram(vaddr);
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}
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EXPORT_SYMBOL(sparc_flush_page_to_ram);
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