mirror of
https://github.com/torvalds/linux
synced 2024-09-21 11:38:48 +00:00
217bbd8188
Based on an original patch from Michael Schmitz:
Because mem_init() is now called before device init, devices that rely on
ST-RAM may find all ST-RAM already allocated to other users by the time
device init happens. In particular, a large initrd RAM disk may use up
enough of ST-RAM to cause atari_stram_alloc() to resort to
__get_dma_pages() allocation.
In the current state of Atari memory management, all of RAM is marked
DMA capable, so __get_dma_pages() may well return RAM that is not in actual
fact DMA capable. Using this for frame buffer or SCSI DMA buffer causes
subtle failure.
The ST-RAM allocator has been changed to allocate memory from a pool of
reserved ST-RAM of configurable size, set aside on ST-RAM init (i.e.
before mem_init()). As long as this pool is not exhausted, allocation of
real ST-RAM can be guaranteed.
Other changes:
- Replace the custom allocator in the ST-RAM pool by the existing allocator
in the resource subsystem,
- Remove mem_init_done and its hook, as memory init is now done before
device init,
- Remove /proc/stram, as ST-RAM usage now shows up under /proc/iomem, e.g.
005f2000-006f1fff : ST-RAM Pool
005f2000-0063dfff : atafb
0063e000-00641fff : ataflop
00642000-00642fff : SCSI
Signed-off-by: Michael Schmitz <schmitz@debian.org>
[Andreas Schwab <schwab@linux-m68k.org>: Use memparse()]
[Geert: Use the resource subsystem instead of a custom allocator]
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/*
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* linux/arch/m68k/mm/init.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*
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* Contains common initialization routines, specific init code moved
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* to motorola.c and sun3mmu.c
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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/mm.h>
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#include <linux/swap.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/gfp.h>
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#include <asm/setup.h>
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/system.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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#ifdef CONFIG_ATARI
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#include <asm/atari_stram.h>
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#endif
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#include <asm/sections.h>
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#include <asm/tlb.h>
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pg_data_t pg_data_map[MAX_NUMNODES];
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EXPORT_SYMBOL(pg_data_map);
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int m68k_virt_to_node_shift;
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#ifndef CONFIG_SINGLE_MEMORY_CHUNK
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pg_data_t *pg_data_table[65];
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EXPORT_SYMBOL(pg_data_table);
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#endif
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void __init m68k_setup_node(int node)
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{
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#ifndef CONFIG_SINGLE_MEMORY_CHUNK
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struct mem_info *info = m68k_memory + node;
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int i, end;
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i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
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end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
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for (; i <= end; i++) {
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if (pg_data_table[i])
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printk("overlap at %u for chunk %u\n", i, node);
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pg_data_table[i] = pg_data_map + node;
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}
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#endif
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pg_data_map[node].bdata = bootmem_node_data + node;
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node_set_online(node);
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}
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/*
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* ZERO_PAGE is a special page that is used for zero-initialized
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* data and COW.
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*/
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void *empty_zero_page;
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EXPORT_SYMBOL(empty_zero_page);
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extern void init_pointer_table(unsigned long ptable);
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/* References to section boundaries */
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extern pmd_t *zero_pgtable;
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void __init mem_init(void)
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{
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pg_data_t *pgdat;
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int codepages = 0;
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int datapages = 0;
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int initpages = 0;
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int i;
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/* this will put all memory onto the freelists */
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totalram_pages = num_physpages = 0;
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for_each_online_pgdat(pgdat) {
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num_physpages += pgdat->node_present_pages;
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totalram_pages += free_all_bootmem_node(pgdat);
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for (i = 0; i < pgdat->node_spanned_pages; i++) {
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struct page *page = pgdat->node_mem_map + i;
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char *addr = page_to_virt(page);
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if (!PageReserved(page))
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continue;
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if (addr >= _text &&
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addr < _etext)
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codepages++;
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else if (addr >= __init_begin &&
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addr < __init_end)
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initpages++;
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else
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datapages++;
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}
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}
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#ifndef CONFIG_SUN3
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/* insert pointer tables allocated so far into the tablelist */
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init_pointer_table((unsigned long)kernel_pg_dir);
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for (i = 0; i < PTRS_PER_PGD; i++) {
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if (pgd_present(kernel_pg_dir[i]))
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init_pointer_table(__pgd_page(kernel_pg_dir[i]));
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}
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/* insert also pointer table that we used to unmap the zero page */
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if (zero_pgtable)
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init_pointer_table((unsigned long)zero_pgtable);
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#endif
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printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
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nr_free_pages() << (PAGE_SHIFT-10),
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totalram_pages << (PAGE_SHIFT-10),
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codepages << (PAGE_SHIFT-10),
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datapages << (PAGE_SHIFT-10),
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initpages << (PAGE_SHIFT-10));
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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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int pages = 0;
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for (; start < end; start += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(start));
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init_page_count(virt_to_page(start));
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free_page(start);
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totalram_pages++;
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pages++;
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}
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printk ("Freeing initrd memory: %dk freed\n", pages);
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}
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#endif
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