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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114// SPDX-License-Identifier: GPL-2.0/* * system.c - a driver for reserving pnp system resources * * Some code is based on pnpbios_core.c * Copyright 2002 Adam Belay <ambx1@neo.rr.com> * (c) Copyright 2007 Hewlett-Packard Development Company, L.P. * Bjorn Helgaas <bjorn.helgaas@hp.com> */
#include <linux/pnp.h>#include <linux/device.h>#include <linux/init.h>#include <linux/slab.h>#include <linux/kernel.h>#include <linux/ioport.h>
static const struct pnp_device_id pnp_dev_table[] = { /* General ID for reserving resources */ {"PNP0c02", 0}, /* memory controller */ {"PNP0c01", 0}, {"", 0}};
static void reserve_range(struct pnp_dev *dev, struct resource *r, int port){ char *regionid; const char *pnpid = dev_name(&dev->dev); resource_size_t start = r->start, end = r->end; struct resource *res;
regionid = kmalloc(16, GFP_KERNEL); if (!regionid) return;
snprintf(regionid, 16, "pnp %s", pnpid); if (port) res = request_region(start, end - start + 1, regionid); else res = request_mem_region(start, end - start + 1, regionid); if (res) res->flags &= ~IORESOURCE_BUSY; else kfree(regionid);
/* * Failures at this point are usually harmless. pci quirks for * example do reserve stuff they know about too, so we may well * have double reservations. */ dev_info(&dev->dev, "%pR %s reserved\n", r, res ? "has been" : "could not be");}
static void reserve_resources_of_dev(struct pnp_dev *dev){ struct resource *res; int i;
for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) { if (res->flags & IORESOURCE_DISABLED) continue; if (res->start == 0) continue; /* disabled */ if (res->start < 0x100) /* * Below 0x100 is only standard PC hardware * (pics, kbd, timer, dma, ...) * We should not get resource conflicts there, * and the kernel reserves these anyway * (see arch/i386/kernel/setup.c). * So, do nothing */ continue; if (res->end < res->start) continue; /* invalid */
reserve_range(dev, res, 1); }
for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) { if (res->flags & IORESOURCE_DISABLED) continue;
reserve_range(dev, res, 0); }}
static int system_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id){ reserve_resources_of_dev(dev); return 0;}
static struct pnp_driver system_pnp_driver = { .name = "system", .id_table = pnp_dev_table, .flags = PNP_DRIVER_RES_DO_NOT_CHANGE, .probe = system_pnp_probe,};
static int __init pnp_system_init(void){ return pnp_register_driver(&system_pnp_driver);}
/* * Reserve motherboard resources after PCI claim BARs, * but before PCI assign resources for uninitialized PCI devices */fs_initcall(pnp_system_init);