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Added a memlayout.txt, revised README, reduced env size to 4kb

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This commit is contained in:
Bahadir Balban
2008-03-18 18:21:09 +00:00
parent d2aa9a552b
commit 26e6366014
5 changed files with 150 additions and 475 deletions
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docs/memlayout.txt Normal file
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Virtual memory layout on Codezero/ARMv5:
========================================
0xFFFF FFFF .---------------. End of virtual memory
| Syscall page |
0xFFFF F000 |---------------|
| Reserved |
0xFFFF 1000 |---------------|
| Vector page |
0xFFFF 0000 |---------------|
| Reserved |
0xF900 0000 |---------------| UTCB area ends
| |
| ... |
| --------- |
| UTCB page |
| --------- |
| UTCB page |
0xF800 0000 |---------------| UTCB area starts
| |
| Codezero |
| Microkernel |
| |
0xF000 0000 |---------------|
| |
| MM0 pager |
| |
0xE000 0000 |---------------|
| |
| |
| Reserved |
| |
| |
| ... |
0x2000 0000 |---------------| User task area ends
| |
| |
| |
| Task |
| Address Space |
| |
| |
0x1000 0000 |---------------| User task area starts
| |
| |
| Reserved |
| |
| |
0x0 '---------------' Start of virtual memory
User task layout on Codezero/ARMv5:
===================================
0x2000 0000 .---------------. End of user task address space
|4KB Environment|
0x1FFF F000 |---------------|
| 16KB Stack |
| | |
| v |
| |
0x1FFE F000 |---------------|
| |
| Memory |
| available |
| for mmap() |
| |
0x1xxx x000 |---------------|
| BSS |
|---------------|
| Data |
|---------------|
| Text |
0x1000 0000 '---------------' Start of user task address space