[ECOS] Setting tty device interrupt priority, spltty()

[ECOS] Setting tty device interrupt priority, spltty()

[Arif.Abbas]

Hi everyone!

		I want to be able to set a priority to the tty level
priority.
I saw that spl's such as splnet, splimp etc etc are defined in
tcpip/current/include/sys/param.h
as
#define splimp()   cyg_splimp(__FUNCTION__, __LINE__)
#define splnet()   cyg_splnet(__FUNCTION__, __LINE__)
#define splclock() cyg_splclock(__FUNCTION__, __LINE__)
#define splsoftnet() cyg_splsoftnet(__FUNCTION__, __LINE__)
#define splx(x)    cyg_splx(x, __FUNCTION__, __LINE__)

I also find the cyg_splxxx() functions in the file synch.c as

cyg_uint32
cyg_splxxx(SPLXARGS)
{
    SPLXTRACE;
    return spl_any( SPL_XXX );
}

where 
SPL_XXX is defined as 

#define SPL_IMP      0x01
#define SPL_NET      0x02
#define SPL_CLOCK    0x04
#define SPL_SOFTNET  0x08
#define SPL_INTERNAL 0x10

I am not sure on which priority to the tty device (the choices are 0x03 or
0x05-0x07 or to simply 
rearrange the prioritys)
Any suggestions??

Best Regards,
Arif Abbas

Re: [ECOS] Setting tty device interrupt priority, spltty()

[Andrew Lunn]

> #define SPL_IMP      0x01
> #define SPL_NET      0x02
> #define SPL_CLOCK    0x04
> #define SPL_SOFTNET  0x08
> #define SPL_INTERNAL 0x10
> 
> I am not sure on which priority to the tty device (the choices are 0x03 or
> 0x05-0x07 or to simply 
> rearrange the prioritys)
> Any suggestions??

The OpenBSD stack uses priorites. The eCos implementation there is no
prioritisation. These are just bits in a flag and are used in
combination of a mutex to provide mutual exclusion.  So define you
SPL_TTY as 0x20 and add all the other function/macros as needed.

        Andrew