df9ee29270
Fix the IRQ flag handling naming. In linux/irqflags.h under one configuration, it maps: local_irq_enable() -> raw_local_irq_enable() local_irq_disable() -> raw_local_irq_disable() local_irq_save() -> raw_local_irq_save() ... and under the other configuration, it maps: raw_local_irq_enable() -> local_irq_enable() raw_local_irq_disable() -> local_irq_disable() raw_local_irq_save() -> local_irq_save() ... This is quite confusing. There should be one set of names expected of the arch, and this should be wrapped to give another set of names that are expected by users of this facility. Change this to have the arch provide: flags = arch_local_save_flags() flags = arch_local_irq_save() arch_local_irq_restore(flags) arch_local_irq_disable() arch_local_irq_enable() arch_irqs_disabled_flags(flags) arch_irqs_disabled() arch_safe_halt() Then linux/irqflags.h wraps these to provide: raw_local_save_flags(flags) raw_local_irq_save(flags) raw_local_irq_restore(flags) raw_local_irq_disable() raw_local_irq_enable() raw_irqs_disabled_flags(flags) raw_irqs_disabled() raw_safe_halt() with type checking on the flags 'arguments', and then wraps those to provide: local_save_flags(flags) local_irq_save(flags) local_irq_restore(flags) local_irq_disable() local_irq_enable() irqs_disabled_flags(flags) irqs_disabled() safe_halt() with tracing included if enabled. The arch functions can now all be inline functions rather than some of them having to be macros. Signed-off-by: David Howells <dhowells@redhat.com> [X86, FRV, MN10300] Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> [Tile] Signed-off-by: Michal Simek <monstr@monstr.eu> [Microblaze] Tested-by: Catalin Marinas <catalin.marinas@arm.com> [ARM] Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> [AVR] Acked-by: Tony Luck <tony.luck@intel.com> [IA-64] Acked-by: Hirokazu Takata <takata@linux-m32r.org> [M32R] Acked-by: Greg Ungerer <gerg@uclinux.org> [M68K/M68KNOMMU] Acked-by: Ralf Baechle <ralf@linux-mips.org> [MIPS] Acked-by: Kyle McMartin <kyle@mcmartin.ca> [PA-RISC] Acked-by: Paul Mackerras <paulus@samba.org> [PowerPC] Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> [S390] Acked-by: Chen Liqin <liqin.chen@sunplusct.com> [Score] Acked-by: Matt Fleming <matt@console-pimps.org> [SH] Acked-by: David S. Miller <davem@davemloft.net> [Sparc] Acked-by: Chris Zankel <chris@zankel.net> [Xtensa] Reviewed-by: Richard Henderson <rth@twiddle.net> [Alpha] Reviewed-by: Yoshinori Sato <ysato@users.sourceforge.jp> [H8300] Cc: starvik@axis.com [CRIS] Cc: jesper.nilsson@axis.com [CRIS] Cc: linux-cris-kernel@axis.com
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/*
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* Access kernel memory without faulting -- s390 specific implementation.
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*
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* Copyright IBM Corp. 2009
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*
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
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*
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*/
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <asm/system.h>
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/*
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* This function writes to kernel memory bypassing DAT and possible
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* write protection. It copies one to four bytes from src to dst
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* using the stura instruction.
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* Returns the number of bytes copied or -EFAULT.
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*/
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static long probe_kernel_write_odd(void *dst, void *src, size_t size)
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{
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unsigned long count, aligned;
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int offset, mask;
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int rc = -EFAULT;
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aligned = (unsigned long) dst & ~3UL;
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offset = (unsigned long) dst & 3;
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count = min_t(unsigned long, 4 - offset, size);
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mask = (0xf << (4 - count)) & 0xf;
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mask >>= offset;
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asm volatile(
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" bras 1,0f\n"
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" icm 0,0,0(%3)\n"
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"0: l 0,0(%1)\n"
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" lra %1,0(%1)\n"
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"1: ex %2,0(1)\n"
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"2: stura 0,%1\n"
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" la %0,0\n"
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"3:\n"
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EX_TABLE(0b,3b) EX_TABLE(1b,3b) EX_TABLE(2b,3b)
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: "+d" (rc), "+a" (aligned)
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: "a" (mask), "a" (src) : "cc", "memory", "0", "1");
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return rc ? rc : count;
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}
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long probe_kernel_write(void *dst, void *src, size_t size)
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{
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long copied = 0;
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while (size) {
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copied = probe_kernel_write_odd(dst, src, size);
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if (copied < 0)
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break;
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dst += copied;
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src += copied;
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size -= copied;
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}
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return copied < 0 ? -EFAULT : 0;
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}
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int memcpy_real(void *dest, void *src, size_t count)
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{
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register unsigned long _dest asm("2") = (unsigned long) dest;
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register unsigned long _len1 asm("3") = (unsigned long) count;
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register unsigned long _src asm("4") = (unsigned long) src;
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register unsigned long _len2 asm("5") = (unsigned long) count;
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unsigned long flags;
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int rc = -EFAULT;
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if (!count)
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return 0;
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flags = __arch_local_irq_stnsm(0xf8UL);
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asm volatile (
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"0: mvcle %1,%2,0x0\n"
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"1: jo 0b\n"
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" lhi %0,0x0\n"
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"2:\n"
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EX_TABLE(1b,2b)
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: "+d" (rc), "+d" (_dest), "+d" (_src), "+d" (_len1),
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"+d" (_len2), "=m" (*((long *) dest))
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: "m" (*((long *) src))
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: "cc", "memory");
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arch_local_irq_restore(flags);
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return rc;
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}
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