mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 18:53:24 +00:00
6b6fabce5a
In case CONFIG_DISCONTIGMEM is set, the memory size of system was always determined by CONFIG_MEMORY_SIZE and was not changeable. This patch fixes set_memory() of arch/m32r/mm/discontig.c so that we can specify memory size by the "mem=<size>" kernel parameter. Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
166 lines
3.9 KiB
C
166 lines
3.9 KiB
C
/*
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* linux/arch/m32r/mm/discontig.c
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*
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* Discontig memory support
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*
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* Copyright (c) 2003 Hitoshi Yamamoto
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*/
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/mmzone.h>
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#include <linux/initrd.h>
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#include <linux/nodemask.h>
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#include <linux/module.h>
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#include <linux/pfn.h>
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#include <asm/setup.h>
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extern char _end[];
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struct pglist_data *node_data[MAX_NUMNODES];
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EXPORT_SYMBOL(node_data);
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pg_data_t m32r_node_data[MAX_NUMNODES];
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/* Memory profile */
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typedef struct {
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unsigned long start_pfn;
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unsigned long pages;
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unsigned long holes;
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unsigned long free_pfn;
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} mem_prof_t;
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static mem_prof_t mem_prof[MAX_NUMNODES];
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extern unsigned long memory_start;
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extern unsigned long memory_end;
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static void __init mem_prof_init(void)
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{
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unsigned long start_pfn, holes, free_pfn;
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const unsigned long zone_alignment = 1UL << (MAX_ORDER - 1);
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unsigned long ul;
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mem_prof_t *mp;
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/* Node#0 SDRAM */
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mp = &mem_prof[0];
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mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
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mp->pages = PFN_DOWN(memory_end - memory_start);
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mp->holes = 0;
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mp->free_pfn = PFN_UP(__pa(_end));
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/* Node#1 internal SRAM */
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mp = &mem_prof[1];
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start_pfn = free_pfn = PFN_UP(CONFIG_IRAM_START);
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holes = 0;
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if (start_pfn & (zone_alignment - 1)) {
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ul = zone_alignment;
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while (start_pfn >= ul)
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ul += zone_alignment;
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start_pfn = ul - zone_alignment;
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holes = free_pfn - start_pfn;
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}
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mp->start_pfn = start_pfn;
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mp->pages = PFN_DOWN(CONFIG_IRAM_SIZE) + holes;
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mp->holes = holes;
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mp->free_pfn = PFN_UP(CONFIG_IRAM_START);
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}
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unsigned long __init setup_memory(void)
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{
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unsigned long bootmap_size;
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unsigned long min_pfn;
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int nid;
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mem_prof_t *mp;
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max_low_pfn = 0;
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min_low_pfn = -1;
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mem_prof_init();
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for_each_online_node(nid) {
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mp = &mem_prof[nid];
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NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
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NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
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min_pfn = mp->start_pfn;
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max_pfn = mp->start_pfn + mp->pages;
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bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
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mp->start_pfn, max_pfn);
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free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
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PFN_PHYS(mp->pages));
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reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
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PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size,
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BOOTMEM_DEFAULT);
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if (max_low_pfn < max_pfn)
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max_low_pfn = max_pfn;
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if (min_low_pfn > min_pfn)
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min_low_pfn = min_pfn;
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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if (LOADER_TYPE && INITRD_START) {
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if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
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reserve_bootmem_node(NODE_DATA(0), INITRD_START,
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INITRD_SIZE, BOOTMEM_DEFAULT);
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initrd_start = INITRD_START + PAGE_OFFSET;
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initrd_end = initrd_start + INITRD_SIZE;
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printk("initrd:start[%08lx],size[%08lx]\n",
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initrd_start, INITRD_SIZE);
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} else {
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printk("initrd extends beyond end of memory "
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"(0x%08lx > 0x%08llx)\ndisabling initrd\n",
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INITRD_START + INITRD_SIZE,
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(unsigned long long)PFN_PHYS(max_low_pfn));
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initrd_start = 0;
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}
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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return max_low_pfn;
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}
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#define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn)
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#define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
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unsigned long __init zone_sizes_init(void)
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{
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unsigned long zones_size[MAX_NR_ZONES], zholes_size[MAX_NR_ZONES];
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unsigned long low, start_pfn;
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unsigned long holes = 0;
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int nid, i;
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mem_prof_t *mp;
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for_each_online_node(nid) {
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mp = &mem_prof[nid];
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for (i = 0 ; i < MAX_NR_ZONES ; i++) {
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zones_size[i] = 0;
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zholes_size[i] = 0;
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}
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start_pfn = START_PFN(nid);
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low = MAX_LOW_PFN(nid);
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zones_size[ZONE_DMA] = low - start_pfn;
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zholes_size[ZONE_DMA] = mp->holes;
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holes += zholes_size[ZONE_DMA];
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free_area_init_node(nid, zones_size, start_pfn, zholes_size);
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}
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/*
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* For test
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* Use all area of internal RAM.
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* see __alloc_pages()
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*/
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NODE_DATA(1)->node_zones->watermark[WMARK_MIN] = 0;
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NODE_DATA(1)->node_zones->watermark[WMARK_LOW] = 0;
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NODE_DATA(1)->node_zones->watermark[WMARK_HIGH] = 0;
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return holes;
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}
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