diff options
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/elf.c | 9 | ||||
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 5 | ||||
| -rw-r--r-- | arch/arm/kernel/smp.c | 64 | ||||
| -rw-r--r-- | arch/arm/kernel/smp_scu.c | 48 | ||||
| -rw-r--r-- | arch/arm/kernel/smp_twd.c | 175 |
6 files changed, 287 insertions, 16 deletions
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 11a5197a221..ff89d0b3abc 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -22,6 +22,8 @@ obj-$(CONFIG_ARTHUR) += arthur.o obj-$(CONFIG_ISA_DMA) += dma-isa.o obj-$(CONFIG_PCI) += bios32.o isa.o obj-$(CONFIG_SMP) += smp.o +obj-$(CONFIG_HAVE_ARM_SCU) += smp_scu.o +obj-$(CONFIG_HAVE_ARM_TWD) += smp_twd.o obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o obj-$(CONFIG_KPROBES) += kprobes.o kprobes-decode.o diff --git a/arch/arm/kernel/elf.c b/arch/arm/kernel/elf.c index d4a0da1e48f..950391f194c 100644 --- a/arch/arm/kernel/elf.c +++ b/arch/arm/kernel/elf.c @@ -78,6 +78,15 @@ int arm_elf_read_implies_exec(const struct elf32_hdr *x, int executable_stack) return 1; if (cpu_architecture() < CPU_ARCH_ARMv6) return 1; +#if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT) + /* + * If we have support for OABI programs, we can never allow NX + * support - our signal syscall restart mechanism relies upon + * being able to execute code placed on the user stack. + */ + return 1; +#else return 0; +#endif } EXPORT_SYMBOL(arm_elf_read_implies_exec); diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 9d7ce4377c5..fc8af43c500 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -818,10 +818,7 @@ __kuser_helper_start: */ __kuser_memory_barrier: @ 0xffff0fa0 - -#if __LINUX_ARM_ARCH__ >= 6 && defined(CONFIG_SMP) - mcr p15, 0, r0, c7, c10, 5 @ dmb -#endif + smp_dmb usr_ret lr .align 5 diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index ece658e773a..de885fd256c 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -22,17 +22,20 @@ #include <linux/smp.h> #include <linux/seq_file.h> #include <linux/irq.h> +#include <linux/percpu.h> +#include <linux/clockchips.h> #include <asm/atomic.h> #include <asm/cacheflush.h> #include <asm/cpu.h> +#include <asm/cputype.h> #include <asm/mmu_context.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/processor.h> #include <asm/tlbflush.h> #include <asm/ptrace.h> -#include <asm/cputype.h> +#include <asm/localtimer.h> /* * as from 2.5, kernels no longer have an init_tasks structure @@ -164,7 +167,7 @@ int __cpuexit __cpu_disable(void) * Take this CPU offline. Once we clear this, we can't return, * and we must not schedule until we're ready to give up the cpu. */ - cpu_clear(cpu, cpu_online_map); + set_cpu_online(cpu, false); /* * OK - migrate IRQs away from this CPU @@ -275,9 +278,9 @@ asmlinkage void __cpuinit secondary_start_kernel(void) local_fiq_enable(); /* - * Setup local timer for this CPU. + * Setup the percpu timer for this CPU. */ - local_timer_setup(); + percpu_timer_setup(); calibrate_delay(); @@ -286,7 +289,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void) /* * OK, now it's safe to let the boot CPU continue */ - cpu_set(cpu, cpu_online_map); + set_cpu_online(cpu, true); /* * OK, it's off to the idle thread for us @@ -384,10 +387,16 @@ void show_local_irqs(struct seq_file *p) seq_putc(p, '\n'); } +/* + * Timer (local or broadcast) support + */ +static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent); + static void ipi_timer(void) { + struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent); irq_enter(); - local_timer_interrupt(); + evt->event_handler(evt); irq_exit(); } @@ -406,6 +415,42 @@ asmlinkage void __exception do_local_timer(struct pt_regs *regs) } #endif +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST +static void smp_timer_broadcast(const struct cpumask *mask) +{ + send_ipi_message(mask, IPI_TIMER); +} + +static void broadcast_timer_set_mode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ +} + +static void local_timer_setup(struct clock_event_device *evt) +{ + evt->name = "dummy_timer"; + evt->features = CLOCK_EVT_FEAT_ONESHOT | + CLOCK_EVT_FEAT_PERIODIC | + CLOCK_EVT_FEAT_DUMMY; + evt->rating = 400; + evt->mult = 1; + evt->set_mode = broadcast_timer_set_mode; + evt->broadcast = smp_timer_broadcast; + + clockevents_register_device(evt); +} +#endif + +void __cpuinit percpu_timer_setup(void) +{ + unsigned int cpu = smp_processor_id(); + struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu); + + evt->cpumask = cpumask_of(cpu); + + local_timer_setup(evt); +} + static DEFINE_SPINLOCK(stop_lock); /* @@ -418,7 +463,7 @@ static void ipi_cpu_stop(unsigned int cpu) dump_stack(); spin_unlock(&stop_lock); - cpu_clear(cpu, cpu_online_map); + set_cpu_online(cpu, false); local_fiq_disable(); local_irq_disable(); @@ -502,11 +547,6 @@ void smp_send_reschedule(int cpu) send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE); } -void smp_timer_broadcast(const struct cpumask *mask) -{ - send_ipi_message(mask, IPI_TIMER); -} - void smp_send_stop(void) { cpumask_t mask = cpu_online_map; diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c new file mode 100644 index 00000000000..d3831f616ee --- /dev/null +++ b/arch/arm/kernel/smp_scu.c @@ -0,0 +1,48 @@ +/* + * linux/arch/arm/kernel/smp_scu.c + * + * Copyright (C) 2002 ARM Ltd. + * 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/init.h> +#include <linux/io.h> + +#include <asm/smp_scu.h> +#include <asm/cacheflush.h> + +#define SCU_CTRL 0x00 +#define SCU_CONFIG 0x04 +#define SCU_CPU_STATUS 0x08 +#define SCU_INVALIDATE 0x0c +#define SCU_FPGA_REVISION 0x10 + +/* + * Get the number of CPU cores from the SCU configuration + */ +unsigned int __init scu_get_core_count(void __iomem *scu_base) +{ + unsigned int ncores = __raw_readl(scu_base + SCU_CONFIG); + return (ncores & 0x03) + 1; +} + +/* + * Enable the SCU + */ +void __init scu_enable(void __iomem *scu_base) +{ + u32 scu_ctrl; + + scu_ctrl = __raw_readl(scu_base + SCU_CTRL); + scu_ctrl |= 1; + __raw_writel(scu_ctrl, scu_base + SCU_CTRL); + + /* + * Ensure that the data accessed by CPU0 before the SCU was + * initialised is visible to the other CPUs. + */ + flush_cache_all(); +} diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c new file mode 100644 index 00000000000..d8c88c633c6 --- /dev/null +++ b/arch/arm/kernel/smp_twd.c @@ -0,0 +1,175 @@ +/* + * linux/arch/arm/kernel/smp_twd.c + * + * Copyright (C) 2002 ARM Ltd. + * 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/init.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/smp.h> +#include <linux/jiffies.h> +#include <linux/clockchips.h> +#include <linux/irq.h> +#include <linux/io.h> + +#include <asm/smp_twd.h> +#include <asm/hardware/gic.h> + +#define TWD_TIMER_LOAD 0x00 +#define TWD_TIMER_COUNTER 0x04 +#define TWD_TIMER_CONTROL 0x08 +#define TWD_TIMER_INTSTAT 0x0C + +#define TWD_WDOG_LOAD 0x20 +#define TWD_WDOG_COUNTER 0x24 +#define TWD_WDOG_CONTROL 0x28 +#define TWD_WDOG_INTSTAT 0x2C +#define TWD_WDOG_RESETSTAT 0x30 +#define TWD_WDOG_DISABLE 0x34 + +#define TWD_TIMER_CONTROL_ENABLE (1 << 0) +#define TWD_TIMER_CONTROL_ONESHOT (0 << 1) +#define TWD_TIMER_CONTROL_PERIODIC (1 << 1) +#define TWD_TIMER_CONTROL_IT_ENABLE (1 << 2) + +/* set up by the platform code */ +void __iomem *twd_base; + +static unsigned long twd_timer_rate; + +static void twd_set_mode(enum clock_event_mode mode, + struct clock_event_device *clk) +{ + unsigned long ctrl; + + switch (mode) { + case CLOCK_EVT_MODE_PERIODIC: + /* timer load already set up */ + ctrl = TWD_TIMER_CONTROL_ENABLE | TWD_TIMER_CONTROL_IT_ENABLE + | TWD_TIMER_CONTROL_PERIODIC; + break; + case CLOCK_EVT_MODE_ONESHOT: + /* period set, and timer enabled in 'next_event' hook */ + ctrl = TWD_TIMER_CONTROL_IT_ENABLE | TWD_TIMER_CONTROL_ONESHOT; + break; + case CLOCK_EVT_MODE_UNUSED: + case CLOCK_EVT_MODE_SHUTDOWN: + default: + ctrl = 0; + } + + __raw_writel(ctrl, twd_base + TWD_TIMER_CONTROL); +} + +static int twd_set_next_event(unsigned long evt, + struct clock_event_device *unused) +{ + unsigned long ctrl = __raw_readl(twd_base + TWD_TIMER_CONTROL); + + ctrl |= TWD_TIMER_CONTROL_ENABLE; + + __raw_writel(evt, twd_base + TWD_TIMER_COUNTER); + __raw_writel(ctrl, twd_base + TWD_TIMER_CONTROL); + + return 0; +} + +/* + * local_timer_ack: checks for a local timer interrupt. + * + * If a local timer interrupt has occurred, acknowledge and return 1. + * Otherwise, return 0. + */ +int twd_timer_ack(void) +{ + if (__raw_readl(twd_base + TWD_TIMER_INTSTAT)) { + __raw_writel(1, twd_base + TWD_TIMER_INTSTAT); + return 1; + } + + return 0; +} + +static void __cpuinit twd_calibrate_rate(void) +{ + unsigned long load, count; + u64 waitjiffies; + + /* + * If this is the first time round, we need to work out how fast + * the timer ticks + */ + if (twd_timer_rate == 0) { + printk(KERN_INFO "Calibrating local timer... "); + + /* Wait for a tick to start */ + waitjiffies = get_jiffies_64() + 1; + + while (get_jiffies_64() < waitjiffies) + udelay(10); + + /* OK, now the tick has started, let's get the timer going */ + waitjiffies += 5; + + /* enable, no interrupt or reload */ + __raw_writel(0x1, twd_base + TWD_TIMER_CONTROL); + + /* maximum value */ + __raw_writel(0xFFFFFFFFU, twd_base + TWD_TIMER_COUNTER); + + while (get_jiffies_64() < waitjiffies) + udelay(10); + + count = __raw_readl(twd_base + TWD_TIMER_COUNTER); + + twd_timer_rate = (0xFFFFFFFFU - count) * (HZ / 5); + + printk("%lu.%02luMHz.\n", twd_timer_rate / 1000000, + (twd_timer_rate / 100000) % 100); + } + + load = twd_timer_rate / HZ; + + __raw_writel(load, twd_base + TWD_TIMER_LOAD); +} + +/* + * Setup the local clock events for a CPU. + */ +void __cpuinit twd_timer_setup(struct clock_event_device *clk) +{ + unsigned long flags; + + twd_calibrate_rate(); + + clk->name = "local_timer"; + clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; + clk->rating = 350; + clk->set_mode = twd_set_mode; + clk->set_next_event = twd_set_next_event; + clk->shift = 20; + clk->mult = div_sc(twd_timer_rate, NSEC_PER_SEC, clk->shift); + clk->max_delta_ns = clockevent_delta2ns(0xffffffff, clk); + clk->min_delta_ns = clockevent_delta2ns(0xf, clk); + + /* Make sure our local interrupt controller has this enabled */ + local_irq_save(flags); + get_irq_chip(clk->irq)->unmask(clk->irq); + local_irq_restore(flags); + + clockevents_register_device(clk); +} + +/* + * take a local timer down + */ +void __cpuexit twd_timer_stop(void) +{ + __raw_writel(0, twd_base + TWD_TIMER_CONTROL); +} |