Commit c6d96328 authored by Helge Deller's avatar Helge Deller
Browse files

parisc: Add cacheflush() syscall 



Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent 40c9c62c

arch/parisc/include/uapi/asm/cachectl.h

0 → 100644
+12 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

#ifndef _ASM_CACHECTL

#define _ASM_CACHECTL



/*

 * Options for cacheflush system call

 */

#define ICACHE	(1<<0)		/* flush instruction cache	  */

#define DCACHE	(1<<1)		/* writeback and flush data cache */

#define BCACHE	(ICACHE|DCACHE) /* flush both caches		  */



#endif	/* _ASM_CACHECTL */

arch/parisc/kernel/cache.c

+49 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/pagemap.h>

#include <linux/sched.h>

#include <linux/sched/mm.h>

#include <linux/syscalls.h>

#include <asm/pdc.h>

#include <asm/cache.h>

#include <asm/cacheflush.h>
@@ -28,6 +29,7 @@ 
#include <asm/sections.h>

#include <asm/shmparam.h>

#include <asm/mmu_context.h>

#include <asm/cachectl.h>



int split_tlb __ro_after_init;

int dcache_stride __ro_after_init;
@@ -790,3 +792,50 @@ void invalidate_kernel_vmap_range(void *vaddr, int size) 
	flush_tlb_kernel_range(start, end);

}

EXPORT_SYMBOL(invalidate_kernel_vmap_range);





SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,

	unsigned int, cache)

{

	unsigned long start, end;

	ASM_EXCEPTIONTABLE_VAR(error);



	if (bytes == 0)

		return 0;

	if (!access_ok((void __user *) addr, bytes))

		return -EFAULT;



	end = addr + bytes;



	if (cache & DCACHE) {

		start = addr;

		__asm__ __volatile__ (

#ifdef CONFIG_64BIT

			"1: cmpb,*<<,n	%0,%2,1b\n"

#else

			"1: cmpb,<<,n	%0,%2,1b\n"

#endif

			"   fic,m	%3(%4,%0)\n"

			"2: sync\n"

			ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 2b)

			: "+r" (start), "+r" (error)

			: "r" (end), "r" (dcache_stride), "i" (SR_USER));

	}



	if (cache & ICACHE && error == 0) {

		start = addr;

		__asm__ __volatile__ (

#ifdef CONFIG_64BIT

			"1: cmpb,*<<,n	%0,%2,1b\n"

#else

			"1: cmpb,<<,n	%0,%2,1b\n"

#endif

			"   fdc,m	%3(%4,%0)\n"

			"2: sync\n"

			ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 2b)

			: "+r" (start), "+r" (error)

			: "r" (end), "r" (icache_stride), "i" (SR_USER));

	}



	return error;

}

arch/parisc/kernel/syscalls/syscall.tbl

+1 −0
Original line number Diff line number Diff line
@@ -400,6 +400,7 @@ 
353	common	pkey_free		sys_pkey_free

354	common	rseq			sys_rseq

355	common	kexec_file_load		sys_kexec_file_load		sys_kexec_file_load

356	common	cacheflush		sys_cacheflush

# up to 402 is unassigned and reserved for arch specific syscalls

403	32	clock_gettime64			sys_clock_gettime		sys_clock_gettime

404	32	clock_settime64			sys_clock_settime		sys_clock_settime