minix/lib/libsys/sys_vinb.c

#include "syslib.h"

/*===========================================================================*
 *                                sys_vinb				     *
 *===========================================================================*/
int sys_vinb(pvb_pairs, nr_ports)
pvb_pair_t *pvb_pairs;			/* (port,byte-value)-pairs */
int nr_ports;				/* nr of pairs to be processed */
{
    message m_io;

    m_io.DIO_REQUEST = _DIO_INPUT | _DIO_BYTE;
    m_io.DIO_VEC_ADDR = (char *) pvb_pairs;
    m_io.DIO_VEC_SIZE = nr_ports;
    return _kernel_call(SYS_VDEVIO, &m_io);
}
Initial revision 2005-04-21 16:53:53 +02:00			`#include "syslib.h"`

			`/===========================================================================`
			`* sys_vinb *`
			`===========================================================================/`
retire PUBLIC, PRIVATE and FORWARD 2012-03-25 20:25:53 +02:00			`int sys_vinb(pvb_pairs, nr_ports)`
Initial revision 2005-04-21 16:53:53 +02:00			`pvb_pair_t pvb_pairs; / (port,byte-value)-pairs */`
			`int nr_ports; /* nr of pairs to be processed */`
			`{`
			`message m_io;`

. removed const from putenv() for g++ . added safecopies.c: these are library functions to maintain grant tables in own address space . sys_safecopy.c: interfaces to kernel calls to perform safe copy functions in from or to foreign process . changes in i/o fields (type merged with request) reflected in library functions (sys_out.c, sys_vinb.c, sys_vinl.c, sys_vinw.c, sys_voutb.c, sys_voutl.c, sys_voutw.c) . type merged with request in sys_sdevio, also now accepts offset which is used when a grant is specified (the _DIO_SAFE subtype) . system printf() function changed to send DIAGNOSTICS_S messages, which specify a grant id instead of a direct address for the buffer to be printed; tty and log can then safecopy the buffer 2006-06-20 10:45:04 +02:00			`m_io.DIO_REQUEST = _DIO_INPUT \| _DIO_BYTE;`
Initial revision 2005-04-21 16:53:53 +02:00			`m_io.DIO_VEC_ADDR = (char *) pvb_pairs;`
			`m_io.DIO_VEC_SIZE = nr_ports;`
Removal of the system task * Userspace change to use the new kernel calls - _taskcall(SYSTASK...) changed to _kernel_call(...) - int 32 reused for the kernel calls - _do_kernel_call() to make the trap to kernel - kernel_call() to make the actuall kernel call from C using _do_kernel_call() - unlike ipc call the kernel call always succeeds as kernel is always available, however, kernel may return an error * Kernel side implementation of kernel calls - the SYSTEm task does not run, only the proc table entry is preserved - every data_copy(SYSTEM is no data_copy(KERNEL - "locking" is an empty operation now as everything runs in kernel - sys_task() is replaced by kernel_call() which copies the message into kernel, dispatches the call to its handler and finishes by either copying the results back to userspace (if need be) or by suspending the process because of VM - suspended processes are later made runnable once the memory issue is resolved, picked up by the scheduler and only at this time the call is resumed (in fact restarted) which does not need to copy the message from userspace as the message is already saved in the process structure. - no ned for the vmrestart queue, the scheduler will restart the system calls - no special case in do_vmctl(), all requests remove the RTS_VMREQUEST flag 2010-02-09 16:20:09 +01:00			`return _kernel_call(SYS_VDEVIO, &m_io);`
Initial revision 2005-04-21 16:53:53 +02:00			`}`