Merge branch 'misc' into devel
Conflicts:
arch/arm/Kconfig
arch/arm/common/Makefile
arch/arm/kernel/Makefile
arch/arm/kernel/smp.c
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index fd3ec49..7c33e6f 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -30,7 +30,7 @@
obj-$(CONFIG_ISA_DMA) += dma-isa.o
obj-$(CONFIG_PCI) += bios32.o isa.o
obj-$(CONFIG_HAVE_SCHED_CLOCK) += sched_clock.o
-obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_SMP) += smp.o smp_tlb.o
obj-$(CONFIG_HAVE_ARM_SCU) += smp_scu.o
obj-$(CONFIG_HAVE_ARM_TWD) += smp_twd.o
obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
@@ -44,6 +44,8 @@
obj-$(CONFIG_ARM_UNWIND) += unwind.o
obj-$(CONFIG_HAVE_TCM) += tcm.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
+obj-$(CONFIG_SWP_EMULATE) += swp_emulate.o
+CFLAGS_swp_emulate.o := -Wa,-march=armv7-a
obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
obj-$(CONFIG_CRUNCH) += crunch.o crunch-bits.o
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index bb96a7d..27f6448 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -25,42 +25,22 @@
#include <asm/tls.h>
#include "entry-header.S"
+#include <asm/entry-macro-multi.S>
/*
* Interrupt handling. Preserves r7, r8, r9
*/
.macro irq_handler
- get_irqnr_preamble r5, lr
-1: get_irqnr_and_base r0, r6, r5, lr
- movne r1, sp
- @
- @ routine called with r0 = irq number, r1 = struct pt_regs *
- @
- adrne lr, BSYM(1b)
- bne asm_do_IRQ
-
-#ifdef CONFIG_SMP
- /*
- * XXX
- *
- * this macro assumes that irqstat (r6) and base (r5) are
- * preserved from get_irqnr_and_base above
- */
- ALT_SMP(test_for_ipi r0, r6, r5, lr)
- ALT_UP_B(9997f)
- movne r0, sp
- adrne lr, BSYM(1b)
- bne do_IPI
-
-#ifdef CONFIG_LOCAL_TIMERS
- test_for_ltirq r0, r6, r5, lr
- movne r0, sp
- adrne lr, BSYM(1b)
- bne do_local_timer
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+ ldr r5, =handle_arch_irq
+ mov r0, sp
+ ldr r5, [r5]
+ adr lr, BSYM(9997f)
+ teq r5, #0
+ movne pc, r5
#endif
+ arch_irq_handler_default
9997:
-#endif
-
.endm
#ifdef CONFIG_KPROBES
@@ -735,7 +715,7 @@
THUMB( stmia ip!, {r4 - sl, fp} ) @ Store most regs on stack
THUMB( str sp, [ip], #4 )
THUMB( str lr, [ip], #4 )
-#ifdef CONFIG_MMU
+#ifdef CONFIG_CPU_USE_DOMAINS
ldr r6, [r2, #TI_CPU_DOMAIN]
#endif
set_tls r3, r4, r5
@@ -744,7 +724,7 @@
ldr r8, =__stack_chk_guard
ldr r7, [r7, #TSK_STACK_CANARY]
#endif
-#ifdef CONFIG_MMU
+#ifdef CONFIG_CPU_USE_DOMAINS
mcr p15, 0, r6, c3, c0, 0 @ Set domain register
#endif
mov r5, r0
@@ -842,7 +822,7 @@
*/
__kuser_memory_barrier: @ 0xffff0fa0
- smp_dmb
+ smp_dmb arm
usr_ret lr
.align 5
@@ -959,7 +939,7 @@
#else
- smp_dmb
+ smp_dmb arm
1: ldrex r3, [r2]
subs r3, r3, r0
strexeq r3, r1, [r2]
@@ -1245,3 +1225,9 @@
.space 4
cr_no_alignment:
.space 4
+
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+ .globl handle_arch_irq
+handle_arch_irq:
+ .space 4
+#endif
diff --git a/arch/arm/kernel/fiq.c b/arch/arm/kernel/fiq.c
index 6ff7919..e72dc34 100644
--- a/arch/arm/kernel/fiq.c
+++ b/arch/arm/kernel/fiq.c
@@ -45,6 +45,7 @@
#include <asm/fiq.h>
#include <asm/irq.h>
#include <asm/system.h>
+#include <asm/traps.h>
static unsigned long no_fiq_insn;
@@ -67,17 +68,22 @@
static struct fiq_handler *current_fiq = &default_owner;
-int show_fiq_list(struct seq_file *p, void *v)
+int show_fiq_list(struct seq_file *p, int prec)
{
if (current_fiq != &default_owner)
- seq_printf(p, "FIQ: %s\n", current_fiq->name);
+ seq_printf(p, "%*s: %s\n", prec, "FIQ",
+ current_fiq->name);
return 0;
}
void set_fiq_handler(void *start, unsigned int length)
{
+#if defined(CONFIG_CPU_USE_DOMAINS)
memcpy((void *)0xffff001c, start, length);
+#else
+ memcpy(vectors_page + 0x1c, start, length);
+#endif
flush_icache_range(0xffff001c, 0xffff001c + length);
if (!vectors_high())
flush_icache_range(0x1c, 0x1c + length);
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 6bd82d2..f17d9a0 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -91,6 +91,11 @@
movs r8, r5 @ invalid machine (r5=0)?
THUMB( it eq ) @ force fixup-able long branch encoding
beq __error_a @ yes, error 'a'
+
+ /*
+ * r1 = machine no, r2 = atags,
+ * r8 = machinfo, r9 = cpuid, r10 = procinfo
+ */
bl __vet_atags
#ifdef CONFIG_SMP_ON_UP
bl __fixup_smp
@@ -387,19 +392,19 @@
#ifdef CONFIG_SMP_ON_UP
__fixup_smp:
- mov r7, #0x00070000
- orr r6, r7, #0xff000000 @ mask 0xff070000
- orr r7, r7, #0x41000000 @ val 0x41070000
- and r0, r9, r6
- teq r0, r7 @ ARM CPU and ARMv6/v7?
+ mov r4, #0x00070000
+ orr r3, r4, #0xff000000 @ mask 0xff070000
+ orr r4, r4, #0x41000000 @ val 0x41070000
+ and r0, r9, r3
+ teq r0, r4 @ ARM CPU and ARMv6/v7?
bne __fixup_smp_on_up @ no, assume UP
- orr r6, r6, #0x0000ff00
- orr r6, r6, #0x000000f0 @ mask 0xff07fff0
- orr r7, r7, #0x0000b000
- orr r7, r7, #0x00000020 @ val 0x4107b020
- and r0, r9, r6
- teq r0, r7 @ ARM 11MPCore?
+ orr r3, r3, #0x0000ff00
+ orr r3, r3, #0x000000f0 @ mask 0xff07fff0
+ orr r4, r4, #0x0000b000
+ orr r4, r4, #0x00000020 @ val 0x4107b020
+ and r0, r9, r3
+ teq r0, r4 @ ARM 11MPCore?
moveq pc, lr @ yes, assume SMP
mrc p15, 0, r0, c0, c0, 5 @ read MPIDR
@@ -408,15 +413,22 @@
__fixup_smp_on_up:
adr r0, 1f
- ldmia r0, {r3, r6, r7}
+ ldmia r0, {r3 - r5}
sub r3, r0, r3
- add r6, r6, r3
- add r7, r7, r3
-2: cmp r6, r7
- ldmia r6!, {r0, r4}
- strlo r4, [r0, r3]
- blo 2b
- mov pc, lr
+ add r4, r4, r3
+ add r5, r5, r3
+2: cmp r4, r5
+ movhs pc, lr
+ ldmia r4!, {r0, r6}
+ ARM( str r6, [r0, r3] )
+ THUMB( add r0, r0, r3 )
+#ifdef __ARMEB__
+ THUMB( mov r6, r6, ror #16 ) @ Convert word order for big-endian.
+#endif
+ THUMB( strh r6, [r0], #2 ) @ For Thumb-2, store as two halfwords
+ THUMB( mov r6, r6, lsr #16 ) @ to be robust against misaligned r3.
+ THUMB( strh r6, [r0] )
+ b 2b
ENDPROC(__fixup_smp)
.align
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 6d61633..8135438 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -38,6 +38,7 @@
#include <linux/ftrace.h>
#include <asm/system.h>
+#include <asm/mach/arch.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
@@ -48,8 +49,6 @@
#define irq_finish(irq) do { } while (0)
#endif
-unsigned int arch_nr_irqs;
-void (*init_arch_irq)(void) __initdata = NULL;
unsigned long irq_err_count;
int show_interrupts(struct seq_file *p, void *v)
@@ -58,11 +57,20 @@
struct irq_desc *desc;
struct irqaction * action;
unsigned long flags;
+ int prec, n;
+
+ for (prec = 3, n = 1000; prec < 10 && n <= nr_irqs; prec++)
+ n *= 10;
+
+#ifdef CONFIG_SMP
+ if (prec < 4)
+ prec = 4;
+#endif
if (i == 0) {
char cpuname[12];
- seq_printf(p, " ");
+ seq_printf(p, "%*s ", prec, "");
for_each_present_cpu(cpu) {
sprintf(cpuname, "CPU%d", cpu);
seq_printf(p, " %10s", cpuname);
@@ -77,7 +85,7 @@
if (!action)
goto unlock;
- seq_printf(p, "%3d: ", i);
+ seq_printf(p, "%*d: ", prec, i);
for_each_present_cpu(cpu)
seq_printf(p, "%10u ", kstat_irqs_cpu(i, cpu));
seq_printf(p, " %10s", desc->chip->name ? : "-");
@@ -90,13 +98,15 @@
raw_spin_unlock_irqrestore(&desc->lock, flags);
} else if (i == nr_irqs) {
#ifdef CONFIG_FIQ
- show_fiq_list(p, v);
+ show_fiq_list(p, prec);
#endif
#ifdef CONFIG_SMP
- show_ipi_list(p);
- show_local_irqs(p);
+ show_ipi_list(p, prec);
#endif
- seq_printf(p, "Err: %10lu\n", irq_err_count);
+#ifdef CONFIG_LOCAL_TIMERS
+ show_local_irqs(p, prec);
+#endif
+ seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
}
return 0;
}
@@ -156,13 +166,13 @@
void __init init_IRQ(void)
{
- init_arch_irq();
+ machine_desc->init_irq();
}
#ifdef CONFIG_SPARSE_IRQ
int __init arch_probe_nr_irqs(void)
{
- nr_irqs = arch_nr_irqs ? arch_nr_irqs : NR_IRQS;
+ nr_irqs = machine_desc->nr_irqs ? machine_desc->nr_irqs : NR_IRQS;
return nr_irqs;
}
#endif
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 336f14e..3455ad3 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -75,9 +75,9 @@
unsigned int processor_id;
EXPORT_SYMBOL(processor_id);
-unsigned int __machine_arch_type;
+unsigned int __machine_arch_type __read_mostly;
EXPORT_SYMBOL(__machine_arch_type);
-unsigned int cacheid;
+unsigned int cacheid __read_mostly;
EXPORT_SYMBOL(cacheid);
unsigned int __atags_pointer __initdata;
@@ -91,24 +91,24 @@
unsigned int system_serial_high;
EXPORT_SYMBOL(system_serial_high);
-unsigned int elf_hwcap;
+unsigned int elf_hwcap __read_mostly;
EXPORT_SYMBOL(elf_hwcap);
#ifdef MULTI_CPU
-struct processor processor;
+struct processor processor __read_mostly;
#endif
#ifdef MULTI_TLB
-struct cpu_tlb_fns cpu_tlb;
+struct cpu_tlb_fns cpu_tlb __read_mostly;
#endif
#ifdef MULTI_USER
-struct cpu_user_fns cpu_user;
+struct cpu_user_fns cpu_user __read_mostly;
#endif
#ifdef MULTI_CACHE
-struct cpu_cache_fns cpu_cache;
+struct cpu_cache_fns cpu_cache __read_mostly;
#endif
#ifdef CONFIG_OUTER_CACHE
-struct outer_cache_fns outer_cache;
+struct outer_cache_fns outer_cache __read_mostly;
EXPORT_SYMBOL(outer_cache);
#endif
@@ -126,6 +126,7 @@
static const char *cpu_name;
static const char *machine_name;
static char __initdata cmd_line[COMMAND_LINE_SIZE];
+struct machine_desc *machine_desc __initdata;
static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
@@ -708,13 +709,11 @@
{ 0, ATAG_NONE }
};
-static void (*init_machine)(void) __initdata;
-
static int __init customize_machine(void)
{
/* customizes platform devices, or adds new ones */
- if (init_machine)
- init_machine();
+ if (machine_desc->init_machine)
+ machine_desc->init_machine();
return 0;
}
arch_initcall(customize_machine);
@@ -809,6 +808,7 @@
setup_processor();
mdesc = setup_machine(machine_arch_type);
+ machine_desc = mdesc;
machine_name = mdesc->name;
if (mdesc->soft_reboot)
@@ -868,13 +868,9 @@
cpu_init();
tcm_init();
- /*
- * Set up various architecture-specific pointers
- */
- arch_nr_irqs = mdesc->nr_irqs;
- init_arch_irq = mdesc->init_irq;
- system_timer = mdesc->timer;
- init_machine = mdesc->init_machine;
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+ handle_arch_irq = mdesc->handle_irq;
+#endif
#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
@@ -884,6 +880,9 @@
#endif
#endif
early_trap_init();
+
+ if (mdesc->init_early)
+ mdesc->init_early();
}
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index b6b78b2..5ec79b4 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -25,6 +25,7 @@
#include <linux/irq.h>
#include <linux/percpu.h>
#include <linux/clockchips.h>
+#include <linux/completion.h>
#include <asm/atomic.h>
#include <asm/cacheflush.h>
@@ -38,7 +39,6 @@
#include <asm/tlbflush.h>
#include <asm/ptrace.h>
#include <asm/localtimer.h>
-#include <asm/smp_plat.h>
/*
* as from 2.5, kernels no longer have an init_tasks structure
@@ -47,22 +47,8 @@
*/
struct secondary_data secondary_data;
-/*
- * structures for inter-processor calls
- * - A collection of single bit ipi messages.
- */
-struct ipi_data {
- spinlock_t lock;
- unsigned long ipi_count;
- unsigned long bits;
-};
-
-static DEFINE_PER_CPU(struct ipi_data, ipi_data) = {
- .lock = SPIN_LOCK_UNLOCKED,
-};
-
enum ipi_msg_type {
- IPI_TIMER,
+ IPI_TIMER = 2,
IPI_RESCHEDULE,
IPI_CALL_FUNC,
IPI_CALL_FUNC_SINGLE,
@@ -178,8 +164,12 @@
barrier();
}
- if (!cpu_online(cpu))
+ if (!cpu_online(cpu)) {
+ pr_crit("CPU%u: failed to come online\n", cpu);
ret = -EIO;
+ }
+ } else {
+ pr_err("CPU%u: failed to boot: %d\n", cpu, ret);
}
secondary_data.stack = NULL;
@@ -195,18 +185,12 @@
pgd_free(&init_mm, pgd);
- if (ret) {
- printk(KERN_CRIT "CPU%u: processor failed to boot\n", cpu);
-
- /*
- * FIXME: We need to clean up the new idle thread. --rmk
- */
- }
-
return ret;
}
#ifdef CONFIG_HOTPLUG_CPU
+static void percpu_timer_stop(void);
+
/*
* __cpu_disable runs on the processor to be shutdown.
*/
@@ -234,7 +218,7 @@
/*
* Stop the local timer for this CPU.
*/
- local_timer_stop();
+ percpu_timer_stop();
/*
* Flush user cache and TLB mappings, and then remove this CPU
@@ -253,12 +237,20 @@
return 0;
}
+static DECLARE_COMPLETION(cpu_died);
+
/*
* called on the thread which is asking for a CPU to be shutdown -
* waits until shutdown has completed, or it is timed out.
*/
void __cpu_die(unsigned int cpu)
{
+ if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) {
+ pr_err("CPU%u: cpu didn't die\n", cpu);
+ return;
+ }
+ printk(KERN_NOTICE "CPU%u: shutdown\n", cpu);
+
if (!platform_cpu_kill(cpu))
printk("CPU%u: unable to kill\n", cpu);
}
@@ -275,12 +267,17 @@
{
unsigned int cpu = smp_processor_id();
- local_irq_disable();
idle_task_exit();
+ local_irq_disable();
+ mb();
+
+ /* Tell __cpu_die() that this CPU is now safe to dispose of */
+ complete(&cpu_died);
+
/*
* actual CPU shutdown procedure is at least platform (if not
- * CPU) specific
+ * CPU) specific.
*/
platform_cpu_die(cpu);
@@ -290,6 +287,7 @@
* to be repeated to undo the effects of taking the CPU offline.
*/
__asm__("mov sp, %0\n"
+ " mov fp, #0\n"
" b secondary_start_kernel"
:
: "r" (task_stack_page(current) + THREAD_SIZE - 8));
@@ -297,6 +295,17 @@
#endif /* CONFIG_HOTPLUG_CPU */
/*
+ * Called by both boot and secondaries to move global data into
+ * per-processor storage.
+ */
+static void __cpuinit smp_store_cpu_info(unsigned int cpuid)
+{
+ struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid);
+
+ cpu_info->loops_per_jiffy = loops_per_jiffy;
+}
+
+/*
* This is the secondary CPU boot entry. We're using this CPUs
* idle thread stack, but a set of temporary page tables.
*/
@@ -320,6 +329,7 @@
cpu_init();
preempt_disable();
+ trace_hardirqs_off();
/*
* Give the platform a chance to do its own initialisation.
@@ -353,17 +363,6 @@
cpu_idle();
}
-/*
- * Called by both boot and secondaries to move global data into
- * per-processor storage.
- */
-void __cpuinit smp_store_cpu_info(unsigned int cpuid)
-{
- struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid);
-
- cpu_info->loops_per_jiffy = loops_per_jiffy;
-}
-
void __init smp_cpus_done(unsigned int max_cpus)
{
int cpu;
@@ -386,61 +385,80 @@
per_cpu(cpu_data, cpu).idle = current;
}
-static void send_ipi_message(const struct cpumask *mask, enum ipi_msg_type msg)
+void __init smp_prepare_cpus(unsigned int max_cpus)
{
- unsigned long flags;
- unsigned int cpu;
+ unsigned int ncores = num_possible_cpus();
- local_irq_save(flags);
-
- for_each_cpu(cpu, mask) {
- struct ipi_data *ipi = &per_cpu(ipi_data, cpu);
-
- spin_lock(&ipi->lock);
- ipi->bits |= 1 << msg;
- spin_unlock(&ipi->lock);
- }
+ smp_store_cpu_info(smp_processor_id());
/*
- * Call the platform specific cross-CPU call function.
+ * are we trying to boot more cores than exist?
*/
- smp_cross_call(mask);
+ if (max_cpus > ncores)
+ max_cpus = ncores;
- local_irq_restore(flags);
+ if (max_cpus > 1) {
+ /*
+ * Enable the local timer or broadcast device for the
+ * boot CPU, but only if we have more than one CPU.
+ */
+ percpu_timer_setup();
+
+ /*
+ * Initialise the SCU if there are more than one CPU
+ * and let them know where to start.
+ */
+ platform_smp_prepare_cpus(max_cpus);
+ }
}
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
- send_ipi_message(mask, IPI_CALL_FUNC);
+ smp_cross_call(mask, IPI_CALL_FUNC);
}
void arch_send_call_function_single_ipi(int cpu)
{
- send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
+ smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
}
-void show_ipi_list(struct seq_file *p)
+static const char *ipi_types[NR_IPI] = {
+#define S(x,s) [x - IPI_TIMER] = s
+ S(IPI_TIMER, "Timer broadcast interrupts"),
+ S(IPI_RESCHEDULE, "Rescheduling interrupts"),
+ S(IPI_CALL_FUNC, "Function call interrupts"),
+ S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"),
+ S(IPI_CPU_STOP, "CPU stop interrupts"),
+};
+
+void show_ipi_list(struct seq_file *p, int prec)
{
- unsigned int cpu;
+ unsigned int cpu, i;
- seq_puts(p, "IPI:");
+ for (i = 0; i < NR_IPI; i++) {
+ seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
- for_each_present_cpu(cpu)
- seq_printf(p, " %10lu", per_cpu(ipi_data, cpu).ipi_count);
+ for_each_present_cpu(cpu)
+ seq_printf(p, "%10u ",
+ __get_irq_stat(cpu, ipi_irqs[i]));
- seq_putc(p, '\n');
+ seq_printf(p, " %s\n", ipi_types[i]);
+ }
}
-void show_local_irqs(struct seq_file *p)
+u64 smp_irq_stat_cpu(unsigned int cpu)
{
- unsigned int cpu;
+ u64 sum = 0;
+ int i;
- seq_printf(p, "LOC: ");
+ for (i = 0; i < NR_IPI; i++)
+ sum += __get_irq_stat(cpu, ipi_irqs[i]);
- for_each_present_cpu(cpu)
- seq_printf(p, "%10u ", irq_stat[cpu].local_timer_irqs);
+#ifdef CONFIG_LOCAL_TIMERS
+ sum += __get_irq_stat(cpu, local_timer_irqs);
+#endif
- seq_putc(p, '\n');
+ return sum;
}
/*
@@ -463,18 +481,30 @@
int cpu = smp_processor_id();
if (local_timer_ack()) {
- irq_stat[cpu].local_timer_irqs++;
+ __inc_irq_stat(cpu, local_timer_irqs);
ipi_timer();
}
set_irq_regs(old_regs);
}
+
+void show_local_irqs(struct seq_file *p, int prec)
+{
+ unsigned int cpu;
+
+ seq_printf(p, "%*s: ", prec, "LOC");
+
+ for_each_present_cpu(cpu)
+ seq_printf(p, "%10u ", __get_irq_stat(cpu, local_timer_irqs));
+
+ seq_printf(p, " Local timer interrupts\n");
+}
#endif
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
static void smp_timer_broadcast(const struct cpumask *mask)
{
- send_ipi_message(mask, IPI_TIMER);
+ smp_cross_call(mask, IPI_TIMER);
}
#else
#define smp_timer_broadcast NULL
@@ -511,6 +541,21 @@
local_timer_setup(evt);
}
+#ifdef CONFIG_HOTPLUG_CPU
+/*
+ * The generic clock events code purposely does not stop the local timer
+ * on CPU_DEAD/CPU_DEAD_FROZEN hotplug events, so we have to do it
+ * manually here.
+ */
+static void percpu_timer_stop(void)
+{
+ unsigned int cpu = smp_processor_id();
+ struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu);
+
+ evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt);
+}
+#endif
+
static DEFINE_SPINLOCK(stop_lock);
/*
@@ -537,85 +582,70 @@
/*
* Main handler for inter-processor interrupts
- *
- * For ARM, the ipimask now only identifies a single
- * category of IPI (Bit 1 IPIs have been replaced by a
- * different mechanism):
- *
- * Bit 0 - Inter-processor function call
*/
-asmlinkage void __exception_irq_entry do_IPI(struct pt_regs *regs)
+asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs)
{
unsigned int cpu = smp_processor_id();
- struct ipi_data *ipi = &per_cpu(ipi_data, cpu);
struct pt_regs *old_regs = set_irq_regs(regs);
- ipi->ipi_count++;
+ if (ipinr >= IPI_TIMER && ipinr < IPI_TIMER + NR_IPI)
+ __inc_irq_stat(cpu, ipi_irqs[ipinr - IPI_TIMER]);
- for (;;) {
- unsigned long msgs;
+ switch (ipinr) {
+ case IPI_TIMER:
+ ipi_timer();
+ break;
- spin_lock(&ipi->lock);
- msgs = ipi->bits;
- ipi->bits = 0;
- spin_unlock(&ipi->lock);
+ case IPI_RESCHEDULE:
+ /*
+ * nothing more to do - eveything is
+ * done on the interrupt return path
+ */
+ break;
- if (!msgs)
- break;
+ case IPI_CALL_FUNC:
+ generic_smp_call_function_interrupt();
+ break;
- do {
- unsigned nextmsg;
+ case IPI_CALL_FUNC_SINGLE:
+ generic_smp_call_function_single_interrupt();
+ break;
- nextmsg = msgs & -msgs;
- msgs &= ~nextmsg;
- nextmsg = ffz(~nextmsg);
+ case IPI_CPU_STOP:
+ ipi_cpu_stop(cpu);
+ break;
- switch (nextmsg) {
- case IPI_TIMER:
- ipi_timer();
- break;
-
- case IPI_RESCHEDULE:
- /*
- * nothing more to do - eveything is
- * done on the interrupt return path
- */
- break;
-
- case IPI_CALL_FUNC:
- generic_smp_call_function_interrupt();
- break;
-
- case IPI_CALL_FUNC_SINGLE:
- generic_smp_call_function_single_interrupt();
- break;
-
- case IPI_CPU_STOP:
- ipi_cpu_stop(cpu);
- break;
-
- default:
- printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n",
- cpu, nextmsg);
- break;
- }
- } while (msgs);
+ default:
+ printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n",
+ cpu, ipinr);
+ break;
}
-
set_irq_regs(old_regs);
}
void smp_send_reschedule(int cpu)
{
- send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
+ smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE);
}
void smp_send_stop(void)
{
- cpumask_t mask = cpu_online_map;
- cpu_clear(smp_processor_id(), mask);
- if (!cpus_empty(mask))
- send_ipi_message(&mask, IPI_CPU_STOP);
+ unsigned long timeout;
+
+ if (num_online_cpus() > 1) {
+ cpumask_t mask = cpu_online_map;
+ cpu_clear(smp_processor_id(), mask);
+
+ smp_cross_call(&mask, IPI_CPU_STOP);
+ }
+
+ /* Wait up to one second for other CPUs to stop */
+ timeout = USEC_PER_SEC;
+ while (num_online_cpus() > 1 && timeout--)
+ udelay(1);
+
+ if (num_online_cpus() > 1)
+ pr_warning("SMP: failed to stop secondary CPUs\n");
}
/*
@@ -625,128 +655,3 @@
{
return -EINVAL;
}
-
-static void
-on_each_cpu_mask(void (*func)(void *), void *info, int wait,
- const struct cpumask *mask)
-{
- preempt_disable();
-
- smp_call_function_many(mask, func, info, wait);
- if (cpumask_test_cpu(smp_processor_id(), mask))
- func(info);
-
- preempt_enable();
-}
-
-/**********************************************************************/
-
-/*
- * TLB operations
- */
-struct tlb_args {
- struct vm_area_struct *ta_vma;
- unsigned long ta_start;
- unsigned long ta_end;
-};
-
-static inline void ipi_flush_tlb_all(void *ignored)
-{
- local_flush_tlb_all();
-}
-
-static inline void ipi_flush_tlb_mm(void *arg)
-{
- struct mm_struct *mm = (struct mm_struct *)arg;
-
- local_flush_tlb_mm(mm);
-}
-
-static inline void ipi_flush_tlb_page(void *arg)
-{
- struct tlb_args *ta = (struct tlb_args *)arg;
-
- local_flush_tlb_page(ta->ta_vma, ta->ta_start);
-}
-
-static inline void ipi_flush_tlb_kernel_page(void *arg)
-{
- struct tlb_args *ta = (struct tlb_args *)arg;
-
- local_flush_tlb_kernel_page(ta->ta_start);
-}
-
-static inline void ipi_flush_tlb_range(void *arg)
-{
- struct tlb_args *ta = (struct tlb_args *)arg;
-
- local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end);
-}
-
-static inline void ipi_flush_tlb_kernel_range(void *arg)
-{
- struct tlb_args *ta = (struct tlb_args *)arg;
-
- local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end);
-}
-
-void flush_tlb_all(void)
-{
- if (tlb_ops_need_broadcast())
- on_each_cpu(ipi_flush_tlb_all, NULL, 1);
- else
- local_flush_tlb_all();
-}
-
-void flush_tlb_mm(struct mm_struct *mm)
-{
- if (tlb_ops_need_broadcast())
- on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, mm_cpumask(mm));
- else
- local_flush_tlb_mm(mm);
-}
-
-void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
-{
- if (tlb_ops_need_broadcast()) {
- struct tlb_args ta;
- ta.ta_vma = vma;
- ta.ta_start = uaddr;
- on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, mm_cpumask(vma->vm_mm));
- } else
- local_flush_tlb_page(vma, uaddr);
-}
-
-void flush_tlb_kernel_page(unsigned long kaddr)
-{
- if (tlb_ops_need_broadcast()) {
- struct tlb_args ta;
- ta.ta_start = kaddr;
- on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1);
- } else
- local_flush_tlb_kernel_page(kaddr);
-}
-
-void flush_tlb_range(struct vm_area_struct *vma,
- unsigned long start, unsigned long end)
-{
- if (tlb_ops_need_broadcast()) {
- struct tlb_args ta;
- ta.ta_vma = vma;
- ta.ta_start = start;
- ta.ta_end = end;
- on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, mm_cpumask(vma->vm_mm));
- } else
- local_flush_tlb_range(vma, start, end);
-}
-
-void flush_tlb_kernel_range(unsigned long start, unsigned long end)
-{
- if (tlb_ops_need_broadcast()) {
- struct tlb_args ta;
- ta.ta_start = start;
- ta.ta_end = end;
- on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1);
- } else
- local_flush_tlb_kernel_range(start, end);
-}
diff --git a/arch/arm/kernel/smp_tlb.c b/arch/arm/kernel/smp_tlb.c
new file mode 100644
index 0000000..7dcb352
--- /dev/null
+++ b/arch/arm/kernel/smp_tlb.c
@@ -0,0 +1,139 @@
+/*
+ * linux/arch/arm/kernel/smp_tlb.c
+ *
+ * Copyright (C) 2002 ARM Limited, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/preempt.h>
+#include <linux/smp.h>
+
+#include <asm/smp_plat.h>
+#include <asm/tlbflush.h>
+
+static void on_each_cpu_mask(void (*func)(void *), void *info, int wait,
+ const struct cpumask *mask)
+{
+ preempt_disable();
+
+ smp_call_function_many(mask, func, info, wait);
+ if (cpumask_test_cpu(smp_processor_id(), mask))
+ func(info);
+
+ preempt_enable();
+}
+
+/**********************************************************************/
+
+/*
+ * TLB operations
+ */
+struct tlb_args {
+ struct vm_area_struct *ta_vma;
+ unsigned long ta_start;
+ unsigned long ta_end;
+};
+
+static inline void ipi_flush_tlb_all(void *ignored)
+{
+ local_flush_tlb_all();
+}
+
+static inline void ipi_flush_tlb_mm(void *arg)
+{
+ struct mm_struct *mm = (struct mm_struct *)arg;
+
+ local_flush_tlb_mm(mm);
+}
+
+static inline void ipi_flush_tlb_page(void *arg)
+{
+ struct tlb_args *ta = (struct tlb_args *)arg;
+
+ local_flush_tlb_page(ta->ta_vma, ta->ta_start);
+}
+
+static inline void ipi_flush_tlb_kernel_page(void *arg)
+{
+ struct tlb_args *ta = (struct tlb_args *)arg;
+
+ local_flush_tlb_kernel_page(ta->ta_start);
+}
+
+static inline void ipi_flush_tlb_range(void *arg)
+{
+ struct tlb_args *ta = (struct tlb_args *)arg;
+
+ local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end);
+}
+
+static inline void ipi_flush_tlb_kernel_range(void *arg)
+{
+ struct tlb_args *ta = (struct tlb_args *)arg;
+
+ local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end);
+}
+
+void flush_tlb_all(void)
+{
+ if (tlb_ops_need_broadcast())
+ on_each_cpu(ipi_flush_tlb_all, NULL, 1);
+ else
+ local_flush_tlb_all();
+}
+
+void flush_tlb_mm(struct mm_struct *mm)
+{
+ if (tlb_ops_need_broadcast())
+ on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, mm_cpumask(mm));
+ else
+ local_flush_tlb_mm(mm);
+}
+
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
+{
+ if (tlb_ops_need_broadcast()) {
+ struct tlb_args ta;
+ ta.ta_vma = vma;
+ ta.ta_start = uaddr;
+ on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, mm_cpumask(vma->vm_mm));
+ } else
+ local_flush_tlb_page(vma, uaddr);
+}
+
+void flush_tlb_kernel_page(unsigned long kaddr)
+{
+ if (tlb_ops_need_broadcast()) {
+ struct tlb_args ta;
+ ta.ta_start = kaddr;
+ on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1);
+ } else
+ local_flush_tlb_kernel_page(kaddr);
+}
+
+void flush_tlb_range(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end)
+{
+ if (tlb_ops_need_broadcast()) {
+ struct tlb_args ta;
+ ta.ta_vma = vma;
+ ta.ta_start = start;
+ ta.ta_end = end;
+ on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, mm_cpumask(vma->vm_mm));
+ } else
+ local_flush_tlb_range(vma, start, end);
+}
+
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ if (tlb_ops_need_broadcast()) {
+ struct tlb_args ta;
+ ta.ta_start = start;
+ ta.ta_end = end;
+ on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1);
+ } else
+ local_flush_tlb_kernel_range(start, end);
+}
+
diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index 67f933e..dd79074 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -145,13 +145,3 @@
clockevents_register_device(clk);
}
-
-#ifdef CONFIG_HOTPLUG_CPU
-/*
- * take a local timer down
- */
-void twd_timer_stop(void)
-{
- __raw_writel(0, twd_base + TWD_TIMER_CONTROL);
-}
-#endif
diff --git a/arch/arm/kernel/swp_emulate.c b/arch/arm/kernel/swp_emulate.c
new file mode 100644
index 0000000..7a57609
--- /dev/null
+++ b/arch/arm/kernel/swp_emulate.c
@@ -0,0 +1,267 @@
+/*
+ * linux/arch/arm/kernel/swp_emulate.c
+ *
+ * Copyright (C) 2009 ARM Limited
+ * __user_* functions adapted from include/asm/uaccess.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Implements emulation of the SWP/SWPB instructions using load-exclusive and
+ * store-exclusive for processors that have them disabled (or future ones that
+ * might not implement them).
+ *
+ * Syntax of SWP{B} instruction: SWP{B}<c> <Rt>, <Rt2>, [<Rn>]
+ * Where: Rt = destination
+ * Rt2 = source
+ * Rn = address
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <linux/syscalls.h>
+#include <linux/perf_event.h>
+
+#include <asm/traps.h>
+#include <asm/uaccess.h>
+
+/*
+ * Error-checking SWP macros implemented using ldrex{b}/strex{b}
+ */
+#define __user_swpX_asm(data, addr, res, temp, B) \
+ __asm__ __volatile__( \
+ " mov %2, %1\n" \
+ "0: ldrex"B" %1, [%3]\n" \
+ "1: strex"B" %0, %2, [%3]\n" \
+ " cmp %0, #0\n" \
+ " movne %0, %4\n" \
+ "2:\n" \
+ " .section .fixup,\"ax\"\n" \
+ " .align 2\n" \
+ "3: mov %0, %5\n" \
+ " b 2b\n" \
+ " .previous\n" \
+ " .section __ex_table,\"a\"\n" \
+ " .align 3\n" \
+ " .long 0b, 3b\n" \
+ " .long 1b, 3b\n" \
+ " .previous" \
+ : "=&r" (res), "+r" (data), "=&r" (temp) \
+ : "r" (addr), "i" (-EAGAIN), "i" (-EFAULT) \
+ : "cc", "memory")
+
+#define __user_swp_asm(data, addr, res, temp) \
+ __user_swpX_asm(data, addr, res, temp, "")
+#define __user_swpb_asm(data, addr, res, temp) \
+ __user_swpX_asm(data, addr, res, temp, "b")
+
+/*
+ * Macros/defines for extracting register numbers from instruction.
+ */
+#define EXTRACT_REG_NUM(instruction, offset) \
+ (((instruction) & (0xf << (offset))) >> (offset))
+#define RN_OFFSET 16
+#define RT_OFFSET 12
+#define RT2_OFFSET 0
+/*
+ * Bit 22 of the instruction encoding distinguishes between
+ * the SWP and SWPB variants (bit set means SWPB).
+ */
+#define TYPE_SWPB (1 << 22)
+
+static unsigned long swpcounter;
+static unsigned long swpbcounter;
+static unsigned long abtcounter;
+static pid_t previous_pid;
+
+#ifdef CONFIG_PROC_FS
+static int proc_read_status(char *page, char **start, off_t off, int count,
+ int *eof, void *data)
+{
+ char *p = page;
+ int len;
+
+ p += sprintf(p, "Emulated SWP:\t\t%lu\n", swpcounter);
+ p += sprintf(p, "Emulated SWPB:\t\t%lu\n", swpbcounter);
+ p += sprintf(p, "Aborted SWP{B}:\t\t%lu\n", abtcounter);
+ if (previous_pid != 0)
+ p += sprintf(p, "Last process:\t\t%d\n", previous_pid);
+
+ len = (p - page) - off;
+ if (len < 0)
+ len = 0;
+
+ *eof = (len <= count) ? 1 : 0;
+ *start = page + off;
+
+ return len;
+}
+#endif
+
+/*
+ * Set up process info to signal segmentation fault - called on access error.
+ */
+static void set_segfault(struct pt_regs *regs, unsigned long addr)
+{
+ siginfo_t info;
+
+ if (find_vma(current->mm, addr) == NULL)
+ info.si_code = SEGV_MAPERR;
+ else
+ info.si_code = SEGV_ACCERR;
+
+ info.si_signo = SIGSEGV;
+ info.si_errno = 0;
+ info.si_addr = (void *) instruction_pointer(regs);
+
+ pr_debug("SWP{B} emulation: access caused memory abort!\n");
+ arm_notify_die("Illegal memory access", regs, &info, 0, 0);
+
+ abtcounter++;
+}
+
+static int emulate_swpX(unsigned int address, unsigned int *data,
+ unsigned int type)
+{
+ unsigned int res = 0;
+
+ if ((type != TYPE_SWPB) && (address & 0x3)) {
+ /* SWP to unaligned address not permitted */
+ pr_debug("SWP instruction on unaligned pointer!\n");
+ return -EFAULT;
+ }
+
+ while (1) {
+ unsigned long temp;
+
+ /*
+ * Barrier required between accessing protected resource and
+ * releasing a lock for it. Legacy code might not have done
+ * this, and we cannot determine that this is not the case
+ * being emulated, so insert always.
+ */
+ smp_mb();
+
+ if (type == TYPE_SWPB)
+ __user_swpb_asm(*data, address, res, temp);
+ else
+ __user_swp_asm(*data, address, res, temp);
+
+ if (likely(res != -EAGAIN) || signal_pending(current))
+ break;
+
+ cond_resched();
+ }
+
+ if (res == 0) {
+ /*
+ * Barrier also required between aquiring a lock for a
+ * protected resource and accessing the resource. Inserted for
+ * same reason as above.
+ */
+ smp_mb();
+
+ if (type == TYPE_SWPB)
+ swpbcounter++;
+ else
+ swpcounter++;
+ }
+
+ return res;
+}
+
+/*
+ * swp_handler logs the id of calling process, dissects the instruction, sanity
+ * checks the memory location, calls emulate_swpX for the actual operation and
+ * deals with fixup/error handling before returning
+ */
+static int swp_handler(struct pt_regs *regs, unsigned int instr)
+{
+ unsigned int address, destreg, data, type;
+ unsigned int res = 0;
+
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, 0, regs, regs->ARM_pc);
+
+ if (current->pid != previous_pid) {
+ pr_debug("\"%s\" (%ld) uses deprecated SWP{B} instruction\n",
+ current->comm, (unsigned long)current->pid);
+ previous_pid = current->pid;
+ }
+
+ address = regs->uregs[EXTRACT_REG_NUM(instr, RN_OFFSET)];
+ data = regs->uregs[EXTRACT_REG_NUM(instr, RT2_OFFSET)];
+ destreg = EXTRACT_REG_NUM(instr, RT_OFFSET);
+
+ type = instr & TYPE_SWPB;
+
+ pr_debug("addr in r%d->0x%08x, dest is r%d, source in r%d->0x%08x)\n",
+ EXTRACT_REG_NUM(instr, RN_OFFSET), address,
+ destreg, EXTRACT_REG_NUM(instr, RT2_OFFSET), data);
+
+ /* Check access in reasonable access range for both SWP and SWPB */
+ if (!access_ok(VERIFY_WRITE, (address & ~3), 4)) {
+ pr_debug("SWP{B} emulation: access to %p not allowed!\n",
+ (void *)address);
+ res = -EFAULT;
+ } else {
+ res = emulate_swpX(address, &data, type);
+ }
+
+ if (res == 0) {
+ /*
+ * On successful emulation, revert the adjustment to the PC
+ * made in kernel/traps.c in order to resume execution at the
+ * instruction following the SWP{B}.
+ */
+ regs->ARM_pc += 4;
+ regs->uregs[destreg] = data;
+ } else if (res == -EFAULT) {
+ /*
+ * Memory errors do not mean emulation failed.
+ * Set up signal info to return SEGV, then return OK
+ */
+ set_segfault(regs, address);
+ }
+
+ return 0;
+}
+
+/*
+ * Only emulate SWP/SWPB executed in ARM state/User mode.
+ * The kernel must be SWP free and SWP{B} does not exist in Thumb/ThumbEE.
+ */
+static struct undef_hook swp_hook = {
+ .instr_mask = 0x0fb00ff0,
+ .instr_val = 0x01000090,
+ .cpsr_mask = MODE_MASK | PSR_T_BIT | PSR_J_BIT,
+ .cpsr_val = USR_MODE,
+ .fn = swp_handler
+};
+
+/*
+ * Register handler and create status file in /proc/cpu
+ * Invoked as late_initcall, since not needed before init spawned.
+ */
+static int __init swp_emulation_init(void)
+{
+#ifdef CONFIG_PROC_FS
+ struct proc_dir_entry *res;
+
+ res = create_proc_entry("cpu/swp_emulation", S_IRUGO, NULL);
+
+ if (!res)
+ return -ENOMEM;
+
+ res->read_proc = proc_read_status;
+#endif /* CONFIG_PROC_FS */
+
+ printk(KERN_NOTICE "Registering SWP/SWPB emulation handler\n");
+ register_undef_hook(&swp_hook);
+
+ return 0;
+}
+
+late_initcall(swp_emulation_init);
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 38c261f..f1e2eb1 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -30,12 +30,13 @@
#include <asm/leds.h>
#include <asm/thread_info.h>
#include <asm/stacktrace.h>
+#include <asm/mach/arch.h>
#include <asm/mach/time.h>
/*
* Our system timer.
*/
-struct sys_timer *system_timer;
+static struct sys_timer *system_timer;
#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
/* this needs a better home */
@@ -160,6 +161,7 @@
void __init time_init(void)
{
+ system_timer = machine_desc->timer;
system_timer->init();
}
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 446aee9..e02f4f7 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -37,6 +37,8 @@
static const char *handler[]= { "prefetch abort", "data abort", "address exception", "interrupt" };
+void *vectors_page;
+
#ifdef CONFIG_DEBUG_USER
unsigned int user_debug;
@@ -756,7 +758,11 @@
void __init early_trap_init(void)
{
+#if defined(CONFIG_CPU_USE_DOMAINS)
unsigned long vectors = CONFIG_VECTORS_BASE;
+#else
+ unsigned long vectors = (unsigned long)vectors_page;
+#endif
extern char __stubs_start[], __stubs_end[];
extern char __vectors_start[], __vectors_end[];
extern char __kuser_helper_start[], __kuser_helper_end[];
@@ -780,10 +786,10 @@
* Copy signal return handlers into the vector page, and
* set sigreturn to be a pointer to these.
*/
- memcpy((void *)KERN_SIGRETURN_CODE, sigreturn_codes,
- sizeof(sigreturn_codes));
- memcpy((void *)KERN_RESTART_CODE, syscall_restart_code,
- sizeof(syscall_restart_code));
+ memcpy((void *)(vectors + KERN_SIGRETURN_CODE - CONFIG_VECTORS_BASE),
+ sigreturn_codes, sizeof(sigreturn_codes));
+ memcpy((void *)(vectors + KERN_RESTART_CODE - CONFIG_VECTORS_BASE),
+ syscall_restart_code, sizeof(syscall_restart_code));
flush_icache_range(vectors, vectors + PAGE_SIZE);
modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index 897c1a8..86b66f3 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -168,6 +168,7 @@
NOSAVE_DATA
CACHELINE_ALIGNED_DATA(32)
+ READ_MOSTLY_DATA(32)
/*
* The exception fixup table (might need resorting at runtime)