Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 6d243dd3 authored by Stuart Menefy's avatar Stuart Menefy Committed by Paul Mundt
Browse files

sh: Add sys_cacheflush() call for SH CPUs. 



Adds a system call to allow user code to flush code from the cache.
You can use instructions for the data side, but the iside can
only be done by a flush ROM which really only works with a direct
mapped cache. The later SH4's have 2 way Iside, so this call allows
a portable way to flush the cache.

Signed-off-by: default avatarStuart Menefy <stuart.menefy@st.com>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent a5cf9e24

arch/sh/include/asm/Kbuild

+1 −1
Original line number Diff line number Diff line 
include include/asm-generic/Kbuild.asm



header-y += cpu-features.h

header-y += cachectl.h cpu-features.h



unifdef-y += unistd_32.h

unifdef-y += unistd_64.h

arch/sh/include/asm/cachectl.h

0 → 100644
+12 −0
Original line number Diff line number Diff line 
#ifndef _SH_CACHECTL_H

#define _SH_CACHECTL_H



/* Definitions for the cacheflush system call.  */



#define CACHEFLUSH_D_INVAL	0x1	/* invalidate (without write back) */

#define CACHEFLUSH_D_WB		0x2	/* write back (without invalidate) */

#define CACHEFLUSH_D_PURGE	0x3	/* writeback and invalidate */



#define CACHEFLUSH_I		0x4



#endif /* _SH_CACHECTL_H */

arch/sh/include/asm/unistd_32.h

+1 −1
Original line number Diff line number Diff line
@@ -132,7 +132,7 @@ 
#define __NR_clone		120

#define __NR_setdomainname	121

#define __NR_uname		122

#define __NR_modify_ldt		123

#define __NR_cacheflush		123

#define __NR_adjtimex		124

#define __NR_mprotect		125

#define __NR_sigprocmask	126

arch/sh/include/asm/unistd_64.h

+1 −1
Original line number Diff line number Diff line
@@ -137,7 +137,7 @@ 
#define __NR_clone		120

#define __NR_setdomainname	121

#define __NR_uname		122

#define __NR_modify_ldt		123

#define __NR_cacheflush		123

#define __NR_adjtimex		124

#define __NR_mprotect		125

#define __NR_sigprocmask	126

arch/sh/kernel/sys_sh.c

+43 −0
Original line number Diff line number Diff line
@@ -25,6 +25,8 @@ 
#include <asm/syscalls.h>

#include <asm/uaccess.h>

#include <asm/unistd.h>

#include <asm/cacheflush.h>

#include <asm/cachectl.h>



static inline long

do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
@@ -179,6 +181,47 @@ asmlinkage int sys_ipc(uint call, int first, int second, 
	return -EINVAL;

}



/* sys_cacheflush -- flush (part of) the processor cache.  */

asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, int op)

{

	struct vm_area_struct *vma;



	if ((op < 0) || (op > (CACHEFLUSH_D_PURGE|CACHEFLUSH_I)))

		return -EINVAL;



	/*

	 * Verify that the specified address region actually belongs

	 * to this process.

	 */

	if (addr + len < addr)

		return -EFAULT;



	down_read(&current->mm->mmap_sem);

	vma = find_vma (current->mm, addr);

	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {

		up_read(&current->mm->mmap_sem);

		return -EFAULT;

	}



	switch (op & CACHEFLUSH_D_PURGE) {

		case CACHEFLUSH_D_INVAL:

			__flush_invalidate_region((void *)addr, len);

			break;

		case CACHEFLUSH_D_WB:

			__flush_wback_region((void *)addr, len);

			break;

		case CACHEFLUSH_D_PURGE:

			__flush_purge_region((void *)addr, len);

			break;

	}



	if (op & CACHEFLUSH_I)

		flush_cache_all();



	up_read(&current->mm->mmap_sem);

	return 0;

}



asmlinkage int sys_uname(struct old_utsname __user *name)

{

	int err;