/* * Initialisation code for Cyrix/NatSemi VSA1 softaudio * * (C) Copyright 2003 Red Hat Inc * * XpressAudio(tm) is used on the Cyrix MediaGX (now NatSemi Geode) systems. * The older version (VSA1) provides fairly good soundblaster emulation * although there are a couple of bugs: large DMA buffers break record, * and the MPU event handling seems suspect. VSA2 allows the native driver * to control the AC97 audio engine directly and requires a different driver. * * Thanks to National Semiconductor for providing the needed information * on the XpressAudio(tm) internals. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2, or (at your option) any * later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * TO DO: * Investigate whether we can portably support Cognac (5520) in the * same manner. */ #include #include #include #include #include #include "sound_config.h" #include "sb.h" /* * Read a soundblaster compatible mixer register. * In this case we are actually reading an SMI trap * not real hardware. */ static u8 mixer_read(unsigned long io, u8 reg) { outb(reg, io + 4); udelay(20); reg = inb(io + 5); udelay(20); return reg; } static int probe_one(struct pci_dev *pdev, const struct pci_device_id *ent) { struct address_info *hw_config; unsigned long base; void __iomem *mem; unsigned long io; u16 map; u8 irq, dma8, dma16; int oldquiet; extern int sb_be_quiet; base = pci_resource_start(pdev, 0); if(base == 0UL) return 1; mem = ioremap(base, 128); if (!mem) return 1; map = readw(mem + 0x18); /* Read the SMI enables */ iounmap(mem); /* Map bits 0:1 * 0x20 + 0x200 = sb base 2 sb enable 3 adlib enable 5 MPU enable 0x330 6 MPU enable 0x300 The other bits may be used internally so must be masked */ io = 0x220 + 0x20 * (map & 3); if(map & (1<<2)) printk(KERN_INFO "kahlua: XpressAudio at 0x%lx\n", io); else return 1; if(map & (1<<5)) printk(KERN_INFO "kahlua: MPU at 0x300\n"); else if(map & (1<<6)) printk(KERN_INFO "kahlua: MPU at 0x330\n"); irq = mixer_read(io, 0x80) & 0x0F; dma8 = mixer_read(io, 0x81); // printk("IRQ=%x MAP=%x DMA=%x\n", irq, map, dma8); if(dma8 & 0x20) dma16 = 5; else if(dma8 & 0x40) dma16 = 6; else if(dma8 & 0x80) dma16 = 7; else { printk(KERN_ERR "kahlua: No 16bit DMA enabled.\n"); return 1; } if(dma8 & 0x01) dma8 = 0; else if(dma8 & 0x02) dma8 = 1; else if(dma8 & 0x08) dma8 = 3; else { printk(KERN_ERR "kahlua: No 8bit DMA enabled.\n"); return 1; } if(irq & 1) irq = 9; else if(irq & 2) irq = 5; else if(irq & 4) irq = 7; else if(irq & 8) irq = 10; else { printk(KERN_ERR "kahlua: SB IRQ not set.\n"); return 1; } printk(KERN_INFO "kahlua: XpressAudio on IRQ %d, DMA %d, %d\n", irq, dma8, dma16); hw_config = kzalloc(sizeof(struct address_info), GFP_KERNEL); if(hw_config == NULL) { printk(KERN_ERR "kahlua: out of memory.\n"); return 1; } pci_set_drvdata(pdev, hw_config); hw_config->io_base = io; hw_config->irq = irq; hw_config->dma = dma8; hw_config->dma2 = dma16; hw_config->name = "Cyrix XpressAudio"; hw_config->driver_use_1 = SB_NO_MIDI | SB_PCI_IRQ; if (!request_region(io, 16, "soundblaster")) goto err_out_free; if(sb_dsp_detect(hw_config, 0, 0, NULL)==0) { printk(KERN_ERR "kahlua: audio not responding.\n"); release_region(io, 16); goto err_out_free; } oldquiet = sb_be_quiet; sb_be_quiet = 1; if(sb_dsp_init(hw_config, THIS_MODULE)) { sb_be_quiet = oldquiet; goto err_out_free; } sb_be_quiet = oldquiet; return 0; err_out_free: kfree(hw_config); return 1; } static void remove_one(struct pci_dev *pdev) { struct address_info *hw_config = pci_get_drvdata(pdev); sb_dsp_unload(hw_config, 0); kfree(hw_config); } MODULE_AUTHOR("Alan Cox"); MODULE_DESCRIPTION("Kahlua VSA1 PCI Audio"); MODULE_LICENSE("GPL"); /* * 5530 only. The 5510/5520 decode is different. */ static const struct pci_device_id id_tbl[] = { { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_AUDIO), 0 }, { } }; MODULE_DEVICE_TABLE(pci, id_tbl); static struct pci_driver kahlua_driver = { .name = "kahlua", .id_table = id_tbl, .probe = probe_one, .remove = remove_one, }; static int __init kahlua_init_module(void) { printk(KERN_INFO "Cyrix Kahlua VSA1 XpressAudio support (c) Copyright 2003 Red Hat Inc\n"); return pci_register_driver(&kahlua_driver); } static void kahlua_cleanup_module(void) { pci_unregister_driver(&kahlua_driver); } module_init(kahlua_init_module); module_exit(kahlua_cleanup_module); mingo@kernel.org>2017-02-01 21:17:49 +0100 commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch) treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /net/dccp/dccp.h parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/dccp/dccp.h')