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bc7c314d70
Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Ravikiran Thirumalai <kiran@scalemp.com> Acked-by: Shai Fultheim <shai@scalemp.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
/*
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* vSMPowered(tm) systems specific initialization
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* Copyright (C) 2005 ScaleMP Inc.
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*
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* Use of this code is subject to the terms and conditions of the
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* GNU general public license version 2. See "COPYING" or
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* http://www.gnu.org/licenses/gpl.html
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*
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* Ravikiran Thirumalai <kiran@scalemp.com>,
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* Shai Fultheim <shai@scalemp.com>
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* Paravirt ops integration: Glauber de Oliveira Costa <gcosta@redhat.com>,
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* Ravikiran Thirumalai <kiran@scalemp.com>
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*/
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#include <linux/init.h>
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#include <linux/pci_ids.h>
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#include <linux/pci_regs.h>
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#include <asm/pci-direct.h>
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#include <asm/io.h>
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#include <asm/paravirt.h>
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/*
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* Interrupt control on vSMPowered systems:
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* ~AC is a shadow of IF. If IF is 'on' AC should be 'off'
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* and vice versa.
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*/
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static unsigned long vsmp_save_fl(void)
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{
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unsigned long flags = native_save_fl();
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if (!(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC))
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flags &= ~X86_EFLAGS_IF;
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return flags;
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}
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static void vsmp_restore_fl(unsigned long flags)
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{
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if (flags & X86_EFLAGS_IF)
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flags &= ~X86_EFLAGS_AC;
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else
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flags |= X86_EFLAGS_AC;
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native_restore_fl(flags);
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}
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static void vsmp_irq_disable(void)
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{
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unsigned long flags = native_save_fl();
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native_restore_fl((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC);
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}
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static void vsmp_irq_enable(void)
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{
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unsigned long flags = native_save_fl();
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native_restore_fl((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));
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}
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static unsigned __init vsmp_patch(u8 type, u16 clobbers, void *ibuf,
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unsigned long addr, unsigned len)
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{
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switch (type) {
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case PARAVIRT_PATCH(pv_irq_ops.irq_enable):
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case PARAVIRT_PATCH(pv_irq_ops.irq_disable):
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case PARAVIRT_PATCH(pv_irq_ops.save_fl):
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case PARAVIRT_PATCH(pv_irq_ops.restore_fl):
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return paravirt_patch_default(type, clobbers, ibuf, addr, len);
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default:
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return native_patch(type, clobbers, ibuf, addr, len);
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}
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}
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void __init vsmp_init(void)
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{
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void *address;
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unsigned int cap, ctl, cfg;
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if (!early_pci_allowed())
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return;
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/* Check if we are running on a ScaleMP vSMP box */
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if ((read_pci_config_16(0, 0x1f, 0, PCI_VENDOR_ID) !=
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PCI_VENDOR_ID_SCALEMP) ||
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(read_pci_config_16(0, 0x1f, 0, PCI_DEVICE_ID) !=
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PCI_DEVICE_ID_SCALEMP_VSMP_CTL))
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return;
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/* If we are, use the distinguished irq functions */
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pv_irq_ops.irq_disable = vsmp_irq_disable;
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pv_irq_ops.irq_enable = vsmp_irq_enable;
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pv_irq_ops.save_fl = vsmp_save_fl;
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pv_irq_ops.restore_fl = vsmp_restore_fl;
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pv_init_ops.patch = vsmp_patch;
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/* set vSMP magic bits to indicate vSMP capable kernel */
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cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0);
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address = early_ioremap(cfg, 8);
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cap = readl(address);
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ctl = readl(address + 4);
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printk(KERN_INFO "vSMP CTL: capabilities:0x%08x control:0x%08x\n",
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cap, ctl);
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if (cap & ctl & (1 << 4)) {
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/* Turn on vSMP IRQ fastpath handling (see system.h) */
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ctl &= ~(1 << 4);
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writel(ctl, address + 4);
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ctl = readl(address + 4);
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printk(KERN_INFO "vSMP CTL: control set to:0x%08x\n", ctl);
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}
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early_iounmap(address, 8);
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return;
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}
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