Making use of Intel PAE from user programs
On Red Hat Linux v8, it is possible to make use of the Intel PAE technology from user programs. In particular, it is possible to map arbitrary portions (up to several Mb at a time) of the processor's physical RAM into a process's virtual address space.
I can see Sun online documentation for how Solaris Intel edition device drivers can make use of PAE for DMA purposes (using, e.g., ddi_dma_mem_alloc(9F)). However, I can find no documentation for how to do do something similar to the Linux mapping trick above from an application.
Is this possible? Any tips?
Thanks!
Apparently via the xmemfs filesystem: see man mount_xmemfs(1M).
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#include <sys/conf.h> /* used by dev_ops and cb_ops */
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#include "vmciDatagram.h"
char _depends_on[]="vmci";
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nodev, /* no strategy - nodev returns ENXIO */
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nodev, /* no dump */
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dummy_write,
dummy_ioctl,
nodev, /* no devmap */
nodev, /* no mmap */
nodev, /* no segmap */
dummy_poll, /* returns ENXIO for non-pollable devices */
dummy_prop_op,
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dummy_attach,
dummy_detach,
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MODREV_1,
&md,
NULL
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cmn_err(CE_NOTE, "Inside _info");
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cmn_err(CE_NOTE, "Inside _fini");
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cmn_err(CE_NOTE, "Inside dummy_attach");
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!= DDI_SUCCESS) {
cmn_err(CE_NOTE,
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dummy_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
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Solved!
Go to Solution.Hi,
I've managed to get what I needed by using a shift register + event structure as suggested by Adnan. However, I face another problem after implementing SR+event. I've attached two files, first the original program and second the updated program using SR + event. (it's only the jpg file as I've forgotten to save the labview program, will upload the program by tomorrow.
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Attachments:
Mar 16 - continuous elapsed time.png 12 KB
Mar 16 - elapsed time not continuous after introducing shift register + event structure.png 17 KB -
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