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| sysOutLong and sysInLong [solved] https://forum.osdev.org/viewtopic.php?f=1&t=33161 |
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| Author: | Klakap [ Tue Sep 04, 2018 9:10 am ] |
| Post subject: | sysOutLong and sysInLong [solved] |
Good day! I wanted to implement a PCI but in the method pciConfigReadWord are the methods of sysOutLong and sysInLong and I non found how I should program it. Please, what is code methods sysOutLong and sysInLong? |
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| Author: | zity [ Tue Sep 04, 2018 9:38 am ] |
| Post subject: | Re: sysOutLong and sysInLong |
Hi Klakap, When you need to write or read a long (in this case long means a 32-bit unsigned integer) to an I/O port you need to use the "inl" and "outl" instructions. These instructions work in exactly the same way as their 8- and 16-bit counterparts. For an example of how to write these commands as inline assembly in GCC, see e.g.: https://wiki.osdev.org/Inline_Assembly/Examples#OUTx |
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| Author: | Klakap [ Tue Sep 04, 2018 9:41 am ] |
| Post subject: | Re: sysOutLong and sysInLong |
So outl is it the same as outb? The function outb and inb I have. |
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| Author: | zity [ Tue Sep 04, 2018 10:01 am ] |
| Post subject: | Re: sysOutLong and sysInLong |
No, they are not the same. "outb" is used for writing an 8-bit integer, while "outl" is used for writing a 32-bit integer, but they work in the same way. |
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| Author: | Klakap [ Tue Sep 04, 2018 10:03 am ] |
| Post subject: | Re: sysOutLong and sysInLong |
And please what is code of method outl? |
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| Author: | zity [ Tue Sep 04, 2018 10:05 am ] |
| Post subject: | Re: sysOutLong and sysInLong |
In GCC inline assembly you can use: Code: void outportl(uint16_t port, uint32_t value)
{ asm volatile("outl %0, %%dx" :: "a" (value), "d" (port)); } |
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| Author: | Klakap [ Tue Sep 04, 2018 10:15 am ] |
| Post subject: | Re: sysOutLong and sysInLong |
Very thank you! And please, what is code of Inl? Is similiar methods outw and inw? |
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| Author: | zity [ Tue Sep 04, 2018 10:17 am ] |
| Post subject: | Re: sysOutLong and sysInLong |
Yes, the code for "inl" is equivalent to the code for inb/inw, except that it takes a 32-bit integer as an argument instead. |
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| Author: | Klakap [ Tue Sep 04, 2018 10:21 am ] |
| Post subject: | Re: sysOutLong and sysInLong |
Very thank you! For these methods, I was stuck with my os development. |
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