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.
88 lines
3.6 KiB
C
88 lines
3.6 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_VDEVIO
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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_p1: DIO_VEC_ADDR (pointer to port/ value pairs)
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* m2_i2: DIO_VEC_SIZE (number of ports to read or write)
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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_VDEVIO
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/* Buffer for SYS_VDEVIO to copy (port,value)-pairs from/ to user. */
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PRIVATE char vdevio_buf[VDEVIO_BUF_SIZE];
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PRIVATE pvb_pair_t *pvb = (pvb_pair_t *) vdevio_buf;
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PRIVATE pvw_pair_t *pvw = (pvw_pair_t *) vdevio_buf;
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PRIVATE pvl_pair_t *pvl = (pvl_pair_t *) vdevio_buf;
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/*===========================================================================*
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* do_vdevio *
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*===========================================================================*/
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PUBLIC int do_vdevio(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Perform a series of device I/O on behalf of a non-kernel process. The
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* I/O addresses and I/O values are fetched from and returned to some buffer
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* in user space. The actual I/O is wrapped by lock() and unlock() to prevent
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* that I/O batch from being interrrupted.
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* This is the counterpart of do_devio, which performs a single device I/O.
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*/
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int vec_size; /* size of vector */
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int io_in; /* true if input */
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size_t bytes; /* # bytes to be copied */
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vir_bytes caller_vir; /* virtual address at caller */
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phys_bytes caller_phys; /* physical address at caller */
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int i;
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/* Get the request, size of the request vector, and check the values. */
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if (m_ptr->DIO_REQUEST == DIO_INPUT) io_in = TRUE;
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else if (m_ptr->DIO_REQUEST == DIO_OUTPUT) io_in = FALSE;
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else return(EINVAL);
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if ((vec_size = m_ptr->DIO_VEC_SIZE) <= 0) return(EINVAL);
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switch (m_ptr->DIO_TYPE) {
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case DIO_BYTE: bytes = vec_size * sizeof(pvb_pair_t); break;
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case DIO_WORD: bytes = vec_size * sizeof(pvw_pair_t); break;
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case DIO_LONG: bytes = vec_size * sizeof(pvl_pair_t); break;
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default: return(EINVAL); /* check type once and for all */
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}
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if (bytes > sizeof(vdevio_buf)) return(E2BIG);
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/* Calculate physical addresses and copy (port,value)-pairs from user. */
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caller_vir = (vir_bytes) m_ptr->DIO_VEC_ADDR;
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caller_phys = umap_local(proc_addr(who_p), D, caller_vir, bytes);
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if (0 == caller_phys) return(EFAULT);
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phys_copy(caller_phys, vir2phys(vdevio_buf), (phys_bytes) bytes);
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/* Perform actual device I/O for byte, word, and long values. Note that
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* the entire switch is wrapped in lock() and unlock() to prevent the I/O
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* batch from being interrupted.
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*/
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lock(13, "do_vdevio");
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switch (m_ptr->DIO_TYPE) {
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case DIO_BYTE: /* byte values */
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if (io_in) for (i=0; i<vec_size; i++) pvb[i].value = inb(pvb[i].port);
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else for (i=0; i<vec_size; i++) outb(pvb[i].port, pvb[i].value);
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break;
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case DIO_WORD: /* word values */
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if (io_in) for (i=0; i<vec_size; i++) pvw[i].value = inw(pvw[i].port);
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else for (i=0; i<vec_size; i++) outw(pvw[i].port, pvw[i].value);
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break;
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default: /* long values */
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if (io_in) for (i=0; i<vec_size; i++) pvl[i].value = inl(pvl[i].port);
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else for (i=0; i<vec_size; i++) outl(pvb[i].port, pvl[i].value);
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}
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unlock(13);
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/* Almost done, copy back results for input requests. */
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if (io_in) phys_copy(vir2phys(vdevio_buf), caller_phys, (phys_bytes) bytes);
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return(OK);
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}
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#endif /* USE_VDEVIO */
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