Author: wmb Date: 2008-09-02 04:34:47 +0200 (Tue, 02 Sep 2008) New Revision: 911
Added: cpu/x86/pc/lxdevel/paging.bth cpu/x86/pc/neptune/paging.bth cpu/x86/pc/olpc/paging.bth cpu/x86/pc/paging.fth Log: Removed OLPC dependency from common code by splitting paging.bth into common paging.fth and separate paging.bth's in the platform subdirectories.
Added: cpu/x86/pc/lxdevel/paging.bth =================================================================== --- cpu/x86/pc/lxdevel/paging.bth (rev 0) +++ cpu/x86/pc/lxdevel/paging.bth 2008-09-02 02:34:47 UTC (rev 911) @@ -0,0 +1,7 @@ +purpose: Build script for paging.di + +command: &builder &this +build-now + +fload ${BP}/cpu/x86/pc/lxdevel/config.fth +fload ${BP}/cpu/x86/pc/paging.fth
Added: cpu/x86/pc/neptune/paging.bth =================================================================== --- cpu/x86/pc/neptune/paging.bth (rev 0) +++ cpu/x86/pc/neptune/paging.bth 2008-09-02 02:34:47 UTC (rev 911) @@ -0,0 +1,7 @@ +purpose: Build script for paging.di + +command: &builder &this +build-now + +fload ${BP}/cpu/x86/pc/neptune/config.fth +fload ${BP}/cpu/x86/pc/paging.fth
Added: cpu/x86/pc/olpc/paging.bth =================================================================== --- cpu/x86/pc/olpc/paging.bth (rev 0) +++ cpu/x86/pc/olpc/paging.bth 2008-09-02 02:34:47 UTC (rev 911) @@ -0,0 +1,7 @@ +purpose: Build script for paging.di + +command: &builder &this +build-now + +fload ${BP}/cpu/x86/pc/olpc/config.fth +fload ${BP}/cpu/x86/pc/paging.fth
Added: cpu/x86/pc/paging.fth =================================================================== --- cpu/x86/pc/paging.fth (rev 0) +++ cpu/x86/pc/paging.fth 2008-09-02 02:34:47 UTC (rev 911) @@ -0,0 +1,209 @@ +\ See license at end of file +purpose: Set up page tables and turn on paging + +\needs start-assembling fload ${BP}/cpu/x86/asmtools.fth +\needs write-dropin fload ${BP}/forth/lib/mkdropin.fth + +fload ${BP}/cpu/x86/mmuparam.fth + +hex + +fload ${BP}/cpu/x86/pc/report.fth \ Startup reports + +start-assembling +protected-mode + +\ RAM is on and mem-info-pa tells the memory layout +label entry + \ Initialize virtual page table + \ Initialize linear=physical page table (redundant page table entries) + \ Enable paging (note that page fault handler is not in place yet) + +[ifdef] notdef + \ clear page tables + ax ax xor + /ptab /l / # cx mov + pt-pa # di mov + rep ax stos +[then] + +ascii 1 report + \ create PDEs + +\ Create a mapping for the firmware + + \ In the following code, we use ESI as a physical memory allocation pointer + mem-info-pa 4 + #) si mov \ Top of memory available to software + /page 1- invert # si and \ Page-align just in case + + /fw-ram # si sub \ Base address of firmware area + si dx mov \ Firmware physical address in EDX + + \ Allocate Page Directory + /ptab # si sub + si bx mov \ Page directory PA in EBX + + \ Clear Page Directory + ax ax xor \ value to store + /ptab /l / # cx mov \ #words to clear + bx di mov \ Base address + rep ax stos + + /ptab # si sub + si bp mov \ Page table PA in EBP + + bp ax mov + pte-control # ax or \ Page table PDE in EAX + ax fw-virt-base d# 22 rshift /l* [bx] mov \ Set page directory entry + + \ Fill page table with entries for the firmware + bp di mov + dx ax mov + pte-control # ax or \ Firmware PTE in EAX + /fw-ram /page / # cx mov \ Number of entries + begin + ax stos \ Set PTE + /page # ax add + loopa + + \ Clear the rest of the table + ax ax xor \ Invalid page + /section /fw-ram - /page / # cx mov \ Number of entries + rep ax stos + +\ Linearly-map low addresses to cover physical memory +\ This code could be simplified by using 4M pages, at the expense +\ of requiring a modern processor variant and additional complexity +\ in later MMU management code. + + \ /section is the amount of memory that can be mapped with one page table + mem-info-pa 4 + #) dx mov \ Top of memory available to software + /section 1- # dx add \ Round up to a multiple of /section + d# 22 # dx shr \ Number of ptabs needed + + cr4 ax mov \ Try to turn on Page Size Extension Bit + h# 10 # ax or + ax cr4 mov + + cr4 ax mov \ See if it worked + h# 10 # ax and 0= if + + \ Processor does not support 4M pages, so use page tables + dx ax mov \ Copy of #ptabs + d# 12 # ax shl \ Number of bytes for page tables + ax si sub \ Get memory for page tables + + \ Page Directory Entries + si ax mov + pte-control # ax or \ PDE contents + bx di mov \ Base address + dx cx mov \ Loop count (#ptabs) + begin + ax stos \ pde for linear=physical page table + /ptab # ax add \ Point to next page table + loopa + + \ Page Table Entries + mem-info-pa 4 + #) cx mov \ Top of memory available to software + /page 1- # cx add \ Round to a multiple of /page + d# 12 # cx shr \ #pages + + pte-control # ax mov \ First PTE value (physical 0) + si di mov \ Base address of first page table + begin + ax stos \ Set PTE + /page # ax add + loopa + + d# 10 # dx shl \ #pages mapped by ptabs + dx cx mov \ Move into cx + + mem-info-pa 4 + #) dx mov \ Top of memory available to software + /page 1- # dx add \ Round to a multiple of /page + d# 12 # dx shr \ #pages + + dx cx sub \ #ptes to zero + ax ax xor \ Clear ax to make invalid PTE + rep ax stos \ Fill the leftovers + + + else + \ Use 4M pages. + + \ Page Directory Entries + pte-control h# 80 + # ax mov \ PDE for 4M page at 0 + bx di mov \ Base address + dx cx mov \ Loop count (#ptabs) + begin + ax stos \ pde for linear=physical page table + /section # ax add \ Point to next 4M section + loopa + then + +[ifdef] rom-pa + \ Page Directory Entry + /ptab # si sub + si bp mov \ Page table PA in EBP + bp ax mov + pte-control # ax or \ Page table PDE in EAX + ax rom-pa d# 22 rshift /l* [bx] mov \ Set PDE for ROM page tables + + \ Page Table Entries + + \ create PTEs for the ROM version OFW + rom-pa /page 1- invert land pte-control + # ax mov + bp di mov + rom-pa pte-mask land /page / /l* # di add + + /rom /page / # cx mov + + begin + ax stos + /page # ax add + loopa +[then] + +[ifdef] mem-info-pa + si mem-info-pa 1 la+ #) mov \ Report top of page table area +[then] + +ascii P report + \ enable paging + bx cr3 mov \ Set Page Directory Base Register + cr0 ax mov + 8000.0000 # ax or + ax cr0 mov \ Turn on Paging Enable bit +ascii O report + + ret +end-code + +end-assembling + +writing paging.di +asm-base here over - 0 " paging" write-dropin +ofd @ fclose + +\ LICENSE_BEGIN +\ Copyright (c) 2006 FirmWorks +\ +\ Permission is hereby granted, free of charge, to any person obtaining +\ a copy of this software and associated documentation files (the +\ "Software"), to deal in the Software without restriction, including +\ without limitation the rights to use, copy, modify, merge, publish, +\ distribute, sublicense, and/or sell copies of the Software, and to +\ permit persons to whom the Software is furnished to do so, subject to +\ the following conditions: +\ +\ The above copyright notice and this permission notice shall be +\ included in all copies or substantial portions of the Software. +\ +\ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +\ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +\ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +\ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +\ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +\ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +\ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +\ +\ LICENSE_END