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Add an explanatory note that would have saved me an hour or two

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of confusion had it been there when I started reading the code..
This commit is contained in:
Julian Elischer 2001-08-25 01:16:47 +00:00
parent 38db9454de
commit 6a9344d45a
3 changed files with 21 additions and 0 deletions
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7
sys/amd64/amd64/locore.S
View File

@ -74,6 +74,12 @@
/*
* PTmap is recursive pagemap at top of virtual address space.
* Within PTmap, the page directory can be found (third indirection).
*
* NOTE: PTDpde, PTmap, and PTD are being defined as address symbols.
* In C you access them directly, and not with a '*'. Storage is not being
* allocated. They will magically address teh correct locations in KVM
* whach C will treat as normal variables of the type they are defined in in
* machine/pmap.h, i.e. PTDpde = XX ; to set a PDE entry, NOT *PTDpde = XX;
*/
.globl PTmap,PTD,PTDpde
.set PTmap,(PTDPTDI << PDRSHIFT)
@ -83,6 +89,7 @@
/*
* APTmap, APTD is the alternate recursive pagemap.
* It's used when modifying another process's page tables.
* See the note above. It is true here as well.
*/
.globl APTmap,APTD,APTDpde
.set APTmap,APTDPTDI << PDRSHIFT

7
sys/amd64/amd64/locore.s
View File

@ -74,6 +74,12 @@
/*
* PTmap is recursive pagemap at top of virtual address space.
* Within PTmap, the page directory can be found (third indirection).
*
* NOTE: PTDpde, PTmap, and PTD are being defined as address symbols.
* In C you access them directly, and not with a '*'. Storage is not being
* allocated. They will magically address teh correct locations in KVM
* whach C will treat as normal variables of the type they are defined in in
* machine/pmap.h, i.e. PTDpde = XX ; to set a PDE entry, NOT *PTDpde = XX;
*/
.globl PTmap,PTD,PTDpde
.set PTmap,(PTDPTDI << PDRSHIFT)
@ -83,6 +89,7 @@
/*
* APTmap, APTD is the alternate recursive pagemap.
* It's used when modifying another process's page tables.
* See the note above. It is true here as well.
*/
.globl APTmap,APTD,APTDpde
.set APTmap,APTDPTDI << PDRSHIFT

7
sys/i386/i386/locore.s
View File

@ -74,6 +74,12 @@
/*
* PTmap is recursive pagemap at top of virtual address space.
* Within PTmap, the page directory can be found (third indirection).
*
* NOTE: PTDpde, PTmap, and PTD are being defined as address symbols.
* In C you access them directly, and not with a '*'. Storage is not being
* allocated. They will magically address teh correct locations in KVM
* whach C will treat as normal variables of the type they are defined in in
* machine/pmap.h, i.e. PTDpde = XX ; to set a PDE entry, NOT *PTDpde = XX;
*/
.globl PTmap,PTD,PTDpde
.set PTmap,(PTDPTDI << PDRSHIFT)
@ -83,6 +89,7 @@
/*
* APTmap, APTD is the alternate recursive pagemap.
* It's used when modifying another process's page tables.
* See the note above. It is true here as well.
*/
.globl APTmap,APTD,APTDpde
.set APTmap,APTDPTDI << PDRSHIFT