1335d5d700
instance numbers, encoded and decoded using macros in <minix/endpoint.h>.
proc number -> endpoint migration
. proc_nr in the interrupt hook is now an endpoint, proc_nr_e.
. m_source for messages and notifies is now an endpoint, instead of
proc number.
. isokendpt() converts an endpoint to a process number, returns
success (but fails if the process number is out of range, the
process slot is not a living process, or the given endpoint
number does not match the endpoint number in the process slot,
indicating an old process).
. okendpt() is the same as isokendpt(), but panic()s if the conversion
fails. This is mainly used for decoding message.m_source endpoints,
and other endpoint numbers in kernel data structures, which should
always be correct.
. if DEBUG_ENABLE_IPC_WARNINGS is enabled, isokendpt() and okendpt()
get passed the __FILE__ and __LINE__ of the calling lines, and
print messages about what is wrong with the endpoint number
(out of range proc, empty proc, or inconsistent endpoint number),
with the caller, making finding where the conversion failed easy
without having to include code for every call to print where things
went wrong. Sometimes this is harmless (wrong arg to a kernel call),
sometimes it's a fatal internal inconsistency (bogus m_source).
. some process table fields have been appended an _e to indicate it's
become and endpoint.
. process endpoint is stored in p_endpoint, without generation number.
it turns out the kernel never needs the generation number, except
when fork()ing, so it's decoded then.
. kernel calls all take endpoints as arguments, not proc numbers.
the one exception is sys_fork(), which needs to know in which slot
to put the child.
66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_SDEVIO
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*
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* The parameters for this kernel call are:
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* m2_i3: DIO_REQUEST (request input or output)
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* m2_i1: DIO_TYPE (flag indicating byte, word, or long)
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* m2_l1: DIO_PORT (port to read/ write)
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* m2_p1: DIO_VEC_ADDR (virtual address of buffer)
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* m2_l2: DIO_VEC_SIZE (number of elements)
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* m2_i2: DIO_VEC_PROC (process where buffer is)
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*/
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#include "../system.h"
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#include <minix/devio.h>
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#include <minix/endpoint.h>
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#if USE_SDEVIO
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/*===========================================================================*
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* do_sdevio *
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*===========================================================================*/
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PUBLIC int do_sdevio(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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int proc_nr, proc_nr_e = m_ptr->DIO_VEC_ENDPT;
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int count = m_ptr->DIO_VEC_SIZE;
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long port = m_ptr->DIO_PORT;
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phys_bytes phys_buf;
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/* Check if process endpoint is OK.
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* A driver may directly provide a pointer to a buffer at the user-process
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* that initiated the device I/O. Kernel processes, of course, are denied.
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*/
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if (proc_nr_e == SELF)
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proc_nr = who_p;
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else
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if(!isokendpt(proc_nr_e, &proc_nr))
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return(EINVAL);
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if (iskerneln(proc_nr)) return(EPERM);
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/* Get and check physical address. */
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if ((phys_buf = numap_local(proc_nr, (vir_bytes) m_ptr->DIO_VEC_ADDR, count)) == 0)
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return(EFAULT);
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/* Perform device I/O for bytes and words. Longs are not supported. */
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if (m_ptr->DIO_REQUEST == DIO_INPUT) {
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switch (m_ptr->DIO_TYPE) {
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case DIO_BYTE: phys_insb(port, phys_buf, count); break;
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case DIO_WORD: phys_insw(port, phys_buf, count); break;
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default: return(EINVAL);
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}
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} else if (m_ptr->DIO_REQUEST == DIO_OUTPUT) {
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switch (m_ptr->DIO_TYPE) {
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case DIO_BYTE: phys_outsb(port, phys_buf, count); break;
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case DIO_WORD: phys_outsw(port, phys_buf, count); break;
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default: return(EINVAL);
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}
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}
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else {
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return(EINVAL);
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}
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return(OK);
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}
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#endif /* USE_SDEVIO */
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