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xtensa: ISS: fix specific simcalls

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Simcalls that take memory buffer definitely need wmb or rmb to make sure
gcc doesn't optimize away code that fills the buffer.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
Max Filippov 2012-10-15 03:55:32 +04:00 committed by Chris Zankel
parent ddffeb8c4d
commit 50c08f8e9f
1 changed files with 7 additions and 2 deletions
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9
arch/xtensa/platforms/iss/include/platform/simcall.h
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@ -78,8 +78,9 @@ static inline int __simc(int a, int b, int c, int d, int e, int f)
return ret;
}
static inline int simc_open(char *file, int flags, int mode)
static inline int simc_open(const char *file, int flags, int mode)
{
wmb();
return __simc(SYS_open, (int) file, flags, mode, 0, 0);
}
@ -90,16 +91,19 @@ static inline int simc_close(int fd)
static inline int simc_ioctl(int fd, int request, void *arg)
{
wmb();
return __simc(SYS_ioctl, fd, request, (int) arg, 0, 0);
}
static inline int simc_read(int fd, void *buf, size_t count)
{
rmb();
return __simc(SYS_read, fd, (int) buf, count, 0, 0);
}
static inline int simc_write(int fd, void *buf, size_t count)
static inline int simc_write(int fd, const void *buf, size_t count)
{
wmb();
return __simc(SYS_write, fd, (int) buf, count, 0, 0);
}
@ -107,6 +111,7 @@ static inline int simc_poll(int fd)
{
struct timeval tv = { .tv_sec = 0, .tv_usec = 0 };
wmb();
return __simc(SYS_select_one, fd, XTISS_SELECT_ONE_READ, (int)&tv,
0, 0);
}