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sh: Add sys_cacheflush() call for SH CPUs.

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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: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Stuart Menefy 2009-08-24 18:16:56 +09:00 committed by Paul Mundt
parent a5cf9e2444
commit 6d243dd370
7 changed files with 60 additions and 5 deletions
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2
arch/sh/include/asm/Kbuild
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@ -1,6 +1,6 @@
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

12
arch/sh/include/asm/cachectl.h Normal file
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@ -0,0 +1,12 @@
#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 */

2
arch/sh/include/asm/unistd_32.h
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@ -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

2
arch/sh/include/asm/unistd_64.h
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@ -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

43
arch/sh/kernel/sys_sh.c
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@ -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;

2
arch/sh/kernel/syscalls_32.S
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@ -139,7 +139,7 @@ ENTRY(sys_call_table)
.long sys_clone /* 120 */
.long sys_setdomainname
.long sys_newuname
.long sys_ni_syscall /* sys_modify_ldt */
.long sys_cacheflush /* x86: sys_modify_ldt */
.long sys_adjtimex
.long sys_mprotect /* 125 */
.long sys_sigprocmask

2
arch/sh/kernel/syscalls_64.S
View File

@ -143,7 +143,7 @@ sys_call_table:
.long sys_clone /* 120 */
.long sys_setdomainname
.long sys_newuname
.long sys_ni_syscall /* sys_modify_ldt */
.long sys_cacheflush /* x86: sys_modify_ldt */
.long sys_adjtimex
.long sys_mprotect /* 125 */
.long sys_sigprocmask