d04c56f73c
This implements a lazy strategy for disabling interrupts. This means that local_irq_disable() et al. just clear the 'interrupts are enabled' flag in the paca. If an interrupt comes along, the interrupt entry code notices that interrupts are supposed to be disabled, and clears the EE bit in SRR1, clears the 'interrupts are hard-enabled' flag in the paca, and returns. This means that interrupts only actually get disabled in the processor when an interrupt comes along. When interrupts are enabled by local_irq_enable() et al., the code sets the interrupts-enabled flag in the paca, and then checks whether interrupts got hard-disabled. If so, it also sets the EE bit in the MSR to hard-enable the interrupts. This has the potential to improve performance, and also makes it easier to make a kernel that can boot on iSeries and on other 64-bit machines, since this lazy-disable strategy is very similar to the soft-disable strategy that iSeries already uses. This version renames paca->proc_enabled to paca->soft_enabled, and changes a couple of soft-disables in the kexec code to hard-disables, which should fix the crash that Michael Ellerman saw. This doesn't yet use a reserved CR field for the soft_enabled and hard_enabled flags. This applies on top of Stephen Rothwell's patches to make it possible to build a combined iSeries/other kernel. Signed-off-by: Paul Mackerras <paulus@samba.org>
215 lines
5.2 KiB
C
215 lines
5.2 KiB
C
#include <linux/module.h>
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#include <linux/threads.h>
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#include <linux/smp.h>
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#include <linux/sched.h>
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#include <linux/elfcore.h>
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#include <linux/string.h>
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#include <linux/interrupt.h>
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#include <linux/screen_info.h>
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#include <linux/vt_kern.h>
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#include <linux/nvram.h>
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#include <linux/console.h>
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#include <linux/irq.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/ide.h>
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#include <linux/bitops.h>
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#include <asm/page.h>
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#include <asm/semaphore.h>
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#include <asm/processor.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <asm/ide.h>
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#include <asm/atomic.h>
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#include <asm/checksum.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <linux/adb.h>
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#include <linux/cuda.h>
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#include <linux/pmu.h>
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#include <asm/prom.h>
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#include <asm/system.h>
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#include <asm/pci-bridge.h>
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#include <asm/irq.h>
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#include <asm/pmac_feature.h>
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#include <asm/dma.h>
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#include <asm/machdep.h>
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#include <asm/hw_irq.h>
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#include <asm/nvram.h>
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#include <asm/mmu_context.h>
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#include <asm/backlight.h>
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#include <asm/time.h>
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#include <asm/cputable.h>
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#include <asm/btext.h>
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#include <asm/div64.h>
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#include <asm/signal.h>
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#ifdef CONFIG_8xx
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#include <asm/commproc.h>
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#endif
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#ifdef CONFIG_PPC64
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EXPORT_SYMBOL(local_irq_restore);
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#endif
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#ifdef CONFIG_PPC32
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extern void transfer_to_handler(void);
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extern void do_IRQ(struct pt_regs *regs);
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extern void machine_check_exception(struct pt_regs *regs);
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extern void alignment_exception(struct pt_regs *regs);
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extern void program_check_exception(struct pt_regs *regs);
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extern void single_step_exception(struct pt_regs *regs);
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extern int sys_sigreturn(struct pt_regs *regs);
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EXPORT_SYMBOL(clear_pages);
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EXPORT_SYMBOL(ISA_DMA_THRESHOLD);
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EXPORT_SYMBOL(DMA_MODE_READ);
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EXPORT_SYMBOL(DMA_MODE_WRITE);
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EXPORT_SYMBOL(__div64_32);
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EXPORT_SYMBOL(do_signal);
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EXPORT_SYMBOL(transfer_to_handler);
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EXPORT_SYMBOL(do_IRQ);
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EXPORT_SYMBOL(machine_check_exception);
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EXPORT_SYMBOL(alignment_exception);
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EXPORT_SYMBOL(program_check_exception);
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EXPORT_SYMBOL(single_step_exception);
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EXPORT_SYMBOL(sys_sigreturn);
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#endif
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EXPORT_SYMBOL(strcpy);
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EXPORT_SYMBOL(strncpy);
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EXPORT_SYMBOL(strcat);
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EXPORT_SYMBOL(strlen);
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EXPORT_SYMBOL(strcmp);
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EXPORT_SYMBOL(strcasecmp);
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EXPORT_SYMBOL(strncasecmp);
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EXPORT_SYMBOL(csum_partial);
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EXPORT_SYMBOL(csum_partial_copy_generic);
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EXPORT_SYMBOL(ip_fast_csum);
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EXPORT_SYMBOL(csum_tcpudp_magic);
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EXPORT_SYMBOL(__copy_tofrom_user);
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EXPORT_SYMBOL(__clear_user);
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EXPORT_SYMBOL(__strncpy_from_user);
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EXPORT_SYMBOL(__strnlen_user);
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#ifdef CONFIG_PPC64
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EXPORT_SYMBOL(copy_4K_page);
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#endif
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#if defined(CONFIG_PPC32) && (defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE))
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EXPORT_SYMBOL(ppc_ide_md);
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#endif
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#if defined(CONFIG_PCI) && defined(CONFIG_PPC32)
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EXPORT_SYMBOL(isa_io_base);
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EXPORT_SYMBOL(isa_mem_base);
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EXPORT_SYMBOL(pci_dram_offset);
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EXPORT_SYMBOL(pci_alloc_consistent);
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EXPORT_SYMBOL(pci_free_consistent);
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EXPORT_SYMBOL(pci_bus_io_base);
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EXPORT_SYMBOL(pci_bus_io_base_phys);
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EXPORT_SYMBOL(pci_bus_mem_base_phys);
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EXPORT_SYMBOL(pci_bus_to_hose);
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#endif /* CONFIG_PCI */
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EXPORT_SYMBOL(start_thread);
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EXPORT_SYMBOL(kernel_thread);
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EXPORT_SYMBOL(giveup_fpu);
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#ifdef CONFIG_ALTIVEC
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EXPORT_SYMBOL(giveup_altivec);
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#endif /* CONFIG_ALTIVEC */
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#ifdef CONFIG_SPE
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EXPORT_SYMBOL(giveup_spe);
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#endif /* CONFIG_SPE */
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#ifndef CONFIG_PPC64
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EXPORT_SYMBOL(flush_instruction_cache);
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EXPORT_SYMBOL(flush_tlb_kernel_range);
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EXPORT_SYMBOL(flush_tlb_page);
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EXPORT_SYMBOL(_tlbie);
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#endif
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EXPORT_SYMBOL(__flush_icache_range);
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EXPORT_SYMBOL(flush_dcache_range);
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#ifdef CONFIG_SMP
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#ifdef CONFIG_PPC32
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EXPORT_SYMBOL(smp_hw_index);
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#endif
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#endif
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#ifdef CONFIG_ADB
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EXPORT_SYMBOL(adb_request);
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EXPORT_SYMBOL(adb_register);
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EXPORT_SYMBOL(adb_unregister);
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EXPORT_SYMBOL(adb_poll);
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EXPORT_SYMBOL(adb_try_handler_change);
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#endif /* CONFIG_ADB */
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#ifdef CONFIG_ADB_CUDA
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EXPORT_SYMBOL(cuda_request);
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EXPORT_SYMBOL(cuda_poll);
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#endif /* CONFIG_ADB_CUDA */
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#ifdef CONFIG_VT
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EXPORT_SYMBOL(kd_mksound);
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#endif
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EXPORT_SYMBOL(to_tm);
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#ifdef CONFIG_PPC32
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long long __ashrdi3(long long, int);
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long long __ashldi3(long long, int);
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long long __lshrdi3(long long, int);
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EXPORT_SYMBOL(__ashrdi3);
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EXPORT_SYMBOL(__ashldi3);
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EXPORT_SYMBOL(__lshrdi3);
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#endif
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EXPORT_SYMBOL(memcpy);
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EXPORT_SYMBOL(memset);
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EXPORT_SYMBOL(memmove);
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EXPORT_SYMBOL(memcmp);
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EXPORT_SYMBOL(memchr);
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#if defined(CONFIG_FB_VGA16_MODULE)
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EXPORT_SYMBOL(screen_info);
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#endif
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#ifdef CONFIG_PPC32
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EXPORT_SYMBOL(timer_interrupt);
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EXPORT_SYMBOL(irq_desc);
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EXPORT_SYMBOL(tb_ticks_per_jiffy);
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EXPORT_SYMBOL(console_drivers);
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EXPORT_SYMBOL(cacheable_memcpy);
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#endif
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#ifdef CONFIG_8xx
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EXPORT_SYMBOL(cpm_install_handler);
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EXPORT_SYMBOL(cpm_free_handler);
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#endif /* CONFIG_8xx */
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#if defined(CONFIG_8xx) || defined(CONFIG_40x)
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EXPORT_SYMBOL(__res);
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#endif
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#ifdef CONFIG_PPC32
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EXPORT_SYMBOL(next_mmu_context);
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EXPORT_SYMBOL(set_context);
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#endif
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#ifdef CONFIG_PPC_STD_MMU_32
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extern long mol_trampoline;
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EXPORT_SYMBOL(mol_trampoline); /* For MOL */
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EXPORT_SYMBOL(flush_hash_pages); /* For MOL */
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#ifdef CONFIG_SMP
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extern int mmu_hash_lock;
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EXPORT_SYMBOL(mmu_hash_lock); /* For MOL */
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#endif /* CONFIG_SMP */
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extern long *intercept_table;
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EXPORT_SYMBOL(intercept_table);
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#endif /* CONFIG_PPC_STD_MMU_32 */
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#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
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EXPORT_SYMBOL(__mtdcr);
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EXPORT_SYMBOL(__mfdcr);
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#endif
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