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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566/* * Copyright (C) 2004 - 2007 Paul Mundt * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */#include <linux/mm.h>#include <linux/init.h>#include <linux/platform_device.h>#include <linux/dma-mapping.h>#include <linux/io.h>
static int __init memchunk_setup(char *str){ return 1; /* accept anything that begins with "memchunk." */}__setup("memchunk.", memchunk_setup);
static void __init memchunk_cmdline_override(char *name, unsigned long *sizep){ char *p = boot_command_line; int k = strlen(name);
while ((p = strstr(p, "memchunk."))) { p += 9; /* strlen("memchunk.") */ if (!strncmp(name, p, k) && p[k] == '=') { p += k + 1; *sizep = memparse(p, NULL); pr_info("%s: forcing memory chunk size to 0x%08lx\n", name, *sizep); break; } }}
int __init platform_resource_setup_memory(struct platform_device *pdev, char *name, unsigned long memsize){ struct resource *r; dma_addr_t dma_handle; void *buf;
r = pdev->resource + pdev->num_resources - 1; if (r->flags) { pr_warn("%s: unable to find empty space for resource\n", name); return -EINVAL; }
memchunk_cmdline_override(name, &memsize); if (!memsize) return 0;
buf = dma_alloc_coherent(&pdev->dev, memsize, &dma_handle, GFP_KERNEL); if (!buf) { pr_warn("%s: unable to allocate memory\n", name); return -ENOMEM; }
r->flags = IORESOURCE_MEM; r->start = dma_handle; r->end = r->start + memsize - 1; r->name = name; return 0;}