Revision 140d0b2108faebc77c6523296e211e509cb9f5f9 authored by Linus Torvalds on 05 August 2011, 05:35:59 UTC, committed by Linus Torvalds on 05 August 2011, 05:35:59 UTC
This isn't really critical any more, since other patches (commit 298507d4d2cf: "shm: optimize exit_shm()") have caused us to not actually need to touch the rw_mutex unless there are actual shm segments associated with the namespace, but we really should do tne shm_init_ns() earlier than we do now. This, together with commit 288d5abec831 ("Boot up with usermodehelper disabled") will mean that we really do initialize the initial ipc namespace data structure before we run any tasks. Tested-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 24f0eed
sys_jensen.c
/*
* linux/arch/alpha/kernel/sys_jensen.c
*
* Copyright (C) 1995 Linus Torvalds
* Copyright (C) 1998, 1999 Richard Henderson
*
* Code supporting the Jensen.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#define __EXTERN_INLINE inline
#include <asm/io.h>
#include <asm/jensen.h>
#undef __EXTERN_INLINE
#include <asm/dma.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include "proto.h"
#include "irq_impl.h"
#include "pci_impl.h"
#include "machvec_impl.h"
/*
* Jensen is special: the vector is 0x8X0 for EISA interrupt X, and
* 0x9X0 for the local motherboard interrupts.
*
* Note especially that those local interrupts CANNOT be masked,
* which causes much of the pain below...
*
* 0x660 - NMI
*
* 0x800 - IRQ0 interval timer (not used, as we use the RTC timer)
* 0x810 - IRQ1 line printer (duh..)
* 0x860 - IRQ6 floppy disk
*
* 0x900 - COM1
* 0x920 - COM2
* 0x980 - keyboard
* 0x990 - mouse
*
* PCI-based systems are more sane: they don't have the local
* interrupts at all, and have only normal PCI interrupts from
* devices. Happily it's easy enough to do a sane mapping from the
* Jensen.
*
* Note that this means that we may have to do a hardware
* "local_op" to a different interrupt than we report to the rest of the
* world.
*/
static void
jensen_local_enable(struct irq_data *d)
{
/* the parport is really hw IRQ 1, silly Jensen. */
if (d->irq == 7)
i8259a_enable_irq(d);
}
static void
jensen_local_disable(struct irq_data *d)
{
/* the parport is really hw IRQ 1, silly Jensen. */
if (d->irq == 7)
i8259a_disable_irq(d);
}
static void
jensen_local_mask_ack(struct irq_data *d)
{
/* the parport is really hw IRQ 1, silly Jensen. */
if (d->irq == 7)
i8259a_mask_and_ack_irq(d);
}
static struct irq_chip jensen_local_irq_type = {
.name = "LOCAL",
.irq_unmask = jensen_local_enable,
.irq_mask = jensen_local_disable,
.irq_mask_ack = jensen_local_mask_ack,
};
static void
jensen_device_interrupt(unsigned long vector)
{
int irq;
switch (vector) {
case 0x660:
printk("Whee.. NMI received. Probable hardware error\n");
printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
return;
/* local device interrupts: */
case 0x900: irq = 4; break; /* com1 -> irq 4 */
case 0x920: irq = 3; break; /* com2 -> irq 3 */
case 0x980: irq = 1; break; /* kbd -> irq 1 */
case 0x990: irq = 9; break; /* mouse -> irq 9 */
default:
if (vector > 0x900) {
printk("Unknown local interrupt %lx\n", vector);
return;
}
irq = (vector - 0x800) >> 4;
if (irq == 1)
irq = 7;
break;
}
/* If there is no handler yet... */
if (!irq_has_action(irq)) {
/* If it is a local interrupt that cannot be masked... */
if (vector >= 0x900)
{
/* Clear keyboard/mouse state */
inb(0x64);
inb(0x60);
/* Reset serial ports */
inb(0x3fa);
inb(0x2fa);
outb(0x0c, 0x3fc);
outb(0x0c, 0x2fc);
/* Clear NMI */
outb(0,0x61);
outb(0,0x461);
}
}
#if 0
/* A useful bit of code to find out if an interrupt is going wild. */
{
static unsigned int last_msg = 0, last_cc = 0;
static int last_irq = -1, count = 0;
unsigned int cc;
__asm __volatile("rpcc %0" : "=r"(cc));
++count;
#define JENSEN_CYCLES_PER_SEC (150000000)
if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) ||
irq != last_irq) {
printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n",
irq, count, cc-last_cc, get_irq_regs()->pc);
count = 0;
last_msg = cc;
last_irq = irq;
}
last_cc = cc;
}
#endif
handle_irq(irq);
}
static void __init
jensen_init_irq(void)
{
init_i8259a_irqs();
irq_set_chip_and_handler(1, &jensen_local_irq_type, handle_level_irq);
irq_set_chip_and_handler(4, &jensen_local_irq_type, handle_level_irq);
irq_set_chip_and_handler(3, &jensen_local_irq_type, handle_level_irq);
irq_set_chip_and_handler(7, &jensen_local_irq_type, handle_level_irq);
irq_set_chip_and_handler(9, &jensen_local_irq_type, handle_level_irq);
common_init_isa_dma();
}
static void __init
jensen_init_arch(void)
{
struct pci_controller *hose;
#ifdef CONFIG_PCI
static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, };
isa_bridge = &fake_isa_bridge;
#endif
/* Create a hose so that we can report i/o base addresses to
userland. */
pci_isa_hose = hose = alloc_pci_controller();
hose->io_space = &ioport_resource;
hose->mem_space = &iomem_resource;
hose->index = 0;
hose->sparse_mem_base = EISA_MEM - IDENT_ADDR;
hose->dense_mem_base = 0;
hose->sparse_io_base = EISA_IO - IDENT_ADDR;
hose->dense_io_base = 0;
hose->sg_isa = hose->sg_pci = NULL;
__direct_map_base = 0;
__direct_map_size = 0xffffffff;
}
static void
jensen_machine_check(unsigned long vector, unsigned long la)
{
printk(KERN_CRIT "Machine check\n");
}
/*
* The System Vector
*/
struct alpha_machine_vector jensen_mv __initmv = {
.vector_name = "Jensen",
DO_EV4_MMU,
IO_LITE(JENSEN,jensen),
.machine_check = jensen_machine_check,
.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
.rtc_port = 0x170,
.rtc_get_time = common_get_rtc_time,
.rtc_set_time = common_set_rtc_time,
.nr_irqs = 16,
.device_interrupt = jensen_device_interrupt,
.init_arch = jensen_init_arch,
.init_irq = jensen_init_irq,
.init_rtc = common_init_rtc,
.init_pci = NULL,
.kill_arch = NULL,
};
ALIAS_MV(jensen)
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