diff options
| author | Stuart Menefy <stuart.menefy@st.com> | 2009-08-24 18:16:56 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-08-24 18:16:56 +0900 |
| commit | 6d243dd37002bcee54841852ab1b8606fd457851 (patch) | |
| tree | 9c8e55d065116647615a86e3eb0c783fe98cc83e /arch/sh/kernel | |
| parent | a5cf9e2444ec15de5407696ff21c32dd21ca0a8d (diff) | |
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: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel')
| -rw-r--r-- | arch/sh/kernel/sys_sh.c | 43 | ||||
| -rw-r--r-- | arch/sh/kernel/syscalls_32.S | 2 | ||||
| -rw-r--r-- | arch/sh/kernel/syscalls_64.S | 2 |
3 files changed, 45 insertions, 2 deletions
diff --git a/arch/sh/kernel/sys_sh.c b/arch/sh/kernel/sys_sh.c index 90d00e47264d..ec65dd8842b1 100644 --- a/arch/sh/kernel/sys_sh.c +++ b/arch/sh/kernel/sys_sh.c @@ -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(¤t->mm->mmap_sem); + vma = find_vma (current->mm, addr); + if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) { + up_read(¤t->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(¤t->mm->mmap_sem); + return 0; +} + asmlinkage int sys_uname(struct old_utsname __user *name) { int err; diff --git a/arch/sh/kernel/syscalls_32.S b/arch/sh/kernel/syscalls_32.S index f9e21fa2f592..16ba225ede89 100644 --- a/arch/sh/kernel/syscalls_32.S +++ b/arch/sh/kernel/syscalls_32.S @@ -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 diff --git a/arch/sh/kernel/syscalls_64.S b/arch/sh/kernel/syscalls_64.S index bf420b616ae0..af6fb7410c21 100644 --- a/arch/sh/kernel/syscalls_64.S +++ b/arch/sh/kernel/syscalls_64.S @@ -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 |