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-rw-r--r--arch/x86_64/kernel/e820.c6
-rw-r--r--arch/x86_64/kernel/io_apic.c5
-rw-r--r--arch/x86_64/kernel/kprobes.c6
-rw-r--r--arch/x86_64/kernel/mpparse.c12
-rw-r--r--arch/x86_64/kernel/pci-gart.c8
-rw-r--r--arch/x86_64/kernel/pci-nommu.c7
-rw-r--r--arch/x86_64/kernel/setup.c30
-rw-r--r--arch/x86_64/kernel/traps.c33
8 files changed, 87 insertions, 20 deletions
diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
index 62776c07cff..222b5b46d2b 100644
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -76,6 +76,12 @@ static inline int bad_addr(unsigned long *addrp, unsigned long size)
*addrp = __pa_symbol(&_end);
return 1;
}
+
+ if (last >= ebda_addr && addr < ebda_addr + ebda_size) {
+ *addrp = ebda_addr + ebda_size;
+ return 1;
+ }
+
/* XXX ramdisk image here? */
return 0;
}
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 77b4c608cca..0de3ea93883 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -1777,6 +1777,8 @@ static inline void unlock_ExtINT_logic(void)
spin_unlock_irqrestore(&ioapic_lock, flags);
}
+int timer_uses_ioapic_pin_0;
+
/*
* This code may look a bit paranoid, but it's supposed to cooperate with
* a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
@@ -1814,6 +1816,9 @@ static inline void check_timer(void)
pin2 = ioapic_i8259.pin;
apic2 = ioapic_i8259.apic;
+ if (pin1 == 0)
+ timer_uses_ioapic_pin_0 = 1;
+
apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
vector, apic1, pin1, apic2, pin2);
diff --git a/arch/x86_64/kernel/kprobes.c b/arch/x86_64/kernel/kprobes.c
index 1eaa5dae617..fa1d19ca700 100644
--- a/arch/x86_64/kernel/kprobes.c
+++ b/arch/x86_64/kernel/kprobes.c
@@ -514,13 +514,13 @@ static void __kprobes resume_execution(struct kprobe *p,
*tos = orig_rip + (*tos - copy_rip);
break;
case 0xff:
- if ((*insn & 0x30) == 0x10) {
+ if ((insn[1] & 0x30) == 0x10) {
/* call absolute, indirect */
/* Fix return addr; rip is correct. */
next_rip = regs->rip;
*tos = orig_rip + (*tos - copy_rip);
- } else if (((*insn & 0x31) == 0x20) || /* jmp near, absolute indirect */
- ((*insn & 0x31) == 0x21)) { /* jmp far, absolute indirect */
+ } else if (((insn[1] & 0x31) == 0x20) || /* jmp near, absolute indirect */
+ ((insn[1] & 0x31) == 0x21)) { /* jmp far, absolute indirect */
/* rip is correct. */
next_rip = regs->rip;
}
diff --git a/arch/x86_64/kernel/mpparse.c b/arch/x86_64/kernel/mpparse.c
index b17cf3eba35..083da7e606b 100644
--- a/arch/x86_64/kernel/mpparse.c
+++ b/arch/x86_64/kernel/mpparse.c
@@ -968,7 +968,17 @@ int mp_register_gsi(u32 gsi, int triggering, int polarity)
*/
int irq = gsi;
if (gsi < MAX_GSI_NUM) {
- if (gsi > 15)
+ /*
+ * Retain the VIA chipset work-around (gsi > 15), but
+ * avoid a problem where the 8254 timer (IRQ0) is setup
+ * via an override (so it's not on pin 0 of the ioapic),
+ * and at the same time, the pin 0 interrupt is a PCI
+ * type. The gsi > 15 test could cause these two pins
+ * to be shared as IRQ0, and they are not shareable.
+ * So test for this condition, and if necessary, avoid
+ * the pin collision.
+ */
+ if (gsi > 15 || (gsi == 0 && !timer_uses_ioapic_pin_0))
gsi = pci_irq++;
/*
* Don't assign IRQ used by ACPI SCI
diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
index 9d3d76c85ae..2480d3f08a4 100644
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -639,6 +639,14 @@ static int __init pci_iommu_init(void)
return -1;
}
+ i = 0;
+ for_all_nb(dev)
+ i++;
+ if (i > MAX_NB) {
+ printk(KERN_ERR "PCI-GART: Too many northbridges (%ld). Disabled\n", i);
+ return -1;
+ }
+
printk(KERN_INFO "PCI-DMA: using GART IOMMU.\n");
aper_size = info.aper_size * 1024 * 1024;
iommu_size = check_iommu_size(info.aper_base, aper_size);
diff --git a/arch/x86_64/kernel/pci-nommu.c b/arch/x86_64/kernel/pci-nommu.c
index 44adcc2d5e5..1f6ecc62061 100644
--- a/arch/x86_64/kernel/pci-nommu.c
+++ b/arch/x86_64/kernel/pci-nommu.c
@@ -12,9 +12,10 @@ static int
check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size)
{
if (hwdev && bus + size > *hwdev->dma_mask) {
- printk(KERN_ERR
- "nommu_%s: overflow %Lx+%lu of device mask %Lx\n",
- name, (long long)bus, size, (long long)*hwdev->dma_mask);
+ if (*hwdev->dma_mask >= 0xffffffffULL)
+ printk(KERN_ERR
+ "nommu_%s: overflow %Lx+%lu of device mask %Lx\n",
+ name, (long long)bus, size, (long long)*hwdev->dma_mask);
return 0;
}
return 1;
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index ebc3c33b1c6..f0870bef24d 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -571,17 +571,28 @@ static inline void copy_edd(void)
#endif
#define EBDA_ADDR_POINTER 0x40E
-static void __init reserve_ebda_region(void)
+
+unsigned __initdata ebda_addr;
+unsigned __initdata ebda_size;
+
+static void discover_ebda(void)
{
- unsigned int addr;
- /**
+ /*
* there is a real-mode segmented pointer pointing to the
* 4K EBDA area at 0x40E
*/
- addr = *(unsigned short *)phys_to_virt(EBDA_ADDR_POINTER);
- addr <<= 4;
- if (addr)
- reserve_bootmem_generic(addr, PAGE_SIZE);
+ ebda_addr = *(unsigned short *)EBDA_ADDR_POINTER;
+ ebda_addr <<= 4;
+
+ ebda_size = *(unsigned short *)(unsigned long)ebda_addr;
+
+ /* Round EBDA up to pages */
+ if (ebda_size == 0)
+ ebda_size = 1;
+ ebda_size <<= 10;
+ ebda_size = round_up(ebda_size + (ebda_addr & ~PAGE_MASK), PAGE_SIZE);
+ if (ebda_size > 64*1024)
+ ebda_size = 64*1024;
}
void __init setup_arch(char **cmdline_p)
@@ -627,6 +638,8 @@ void __init setup_arch(char **cmdline_p)
check_efer();
+ discover_ebda();
+
init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
dmi_scan_machine();
@@ -669,7 +682,8 @@ void __init setup_arch(char **cmdline_p)
reserve_bootmem_generic(0, PAGE_SIZE);
/* reserve ebda region */
- reserve_ebda_region();
+ if (ebda_addr)
+ reserve_bootmem_generic(ebda_addr, ebda_size);
#ifdef CONFIG_SMP
/*
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 2700b1375c1..cea335e8746 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -102,6 +102,8 @@ static inline void preempt_conditional_cli(struct pt_regs *regs)
{
if (regs->eflags & X86_EFLAGS_IF)
local_irq_disable();
+ /* Make sure to not schedule here because we could be running
+ on an exception stack. */
preempt_enable_no_resched();
}
@@ -385,6 +387,7 @@ void out_of_line_bug(void)
static DEFINE_SPINLOCK(die_lock);
static int die_owner = -1;
+static unsigned int die_nest_count;
unsigned __kprobes long oops_begin(void)
{
@@ -399,6 +402,7 @@ unsigned __kprobes long oops_begin(void)
else
spin_lock(&die_lock);
}
+ die_nest_count++;
die_owner = cpu;
console_verbose();
bust_spinlocks(1);
@@ -409,7 +413,13 @@ void __kprobes oops_end(unsigned long flags)
{
die_owner = -1;
bust_spinlocks(0);
- spin_unlock_irqrestore(&die_lock, flags);
+ die_nest_count--;
+ if (die_nest_count)
+ /* We still own the lock */
+ local_irq_restore(flags);
+ else
+ /* Nest count reaches zero, release the lock. */
+ spin_unlock_irqrestore(&die_lock, flags);
if (panic_on_oops)
panic("Oops");
}
@@ -464,6 +474,8 @@ void __kprobes die_nmi(char *str, struct pt_regs *regs)
panic("nmi watchdog");
printk("console shuts up ...\n");
oops_end(flags);
+ nmi_exit();
+ local_irq_enable();
do_exit(SIGSEGV);
}
@@ -473,8 +485,6 @@ static void __kprobes do_trap(int trapnr, int signr, char *str,
{
struct task_struct *tsk = current;
- conditional_sti(regs);
-
tsk->thread.error_code = error_code;
tsk->thread.trap_no = trapnr;
@@ -511,6 +521,7 @@ asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
== NOTIFY_STOP) \
return; \
+ conditional_sti(regs); \
do_trap(trapnr, signr, str, regs, error_code, NULL); \
}
@@ -525,6 +536,7 @@ asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
== NOTIFY_STOP) \
return; \
+ conditional_sti(regs); \
do_trap(trapnr, signr, str, regs, error_code, &info); \
}
@@ -538,7 +550,17 @@ DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
DO_ERROR(18, SIGSEGV, "reserved", reserved)
-DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
+
+/* Runs on IST stack */
+asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code)
+{
+ if (notify_die(DIE_TRAP, "stack segment", regs, error_code,
+ 12, SIGBUS) == NOTIFY_STOP)
+ return;
+ preempt_conditional_sti(regs);
+ do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL);
+ preempt_conditional_cli(regs);
+}
asmlinkage void do_double_fault(struct pt_regs * regs, long error_code)
{
@@ -672,8 +694,9 @@ asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code)
if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) {
return;
}
+ preempt_conditional_sti(regs);
do_trap(3, SIGTRAP, "int3", regs, error_code, NULL);
- return;
+ preempt_conditional_cli(regs);
}
/* Help handler running on IST stack to switch back to user stack
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-26 05:13:22 +0000