diff options
Diffstat (limited to 'doc/memlayout.txt')
| -rw-r--r-- | doc/memlayout.txt | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/doc/memlayout.txt b/doc/memlayout.txt index 6720d00..af760ca 100644 --- a/doc/memlayout.txt +++ b/doc/memlayout.txt @@ -1,8 +1,14 @@ -This is the memory layout of a standard service : +This is the memory layout of a standard process : +This can be changed by the app : - 0x00100000 to 0x20000000 Application's code and static data -- 0x20000000 to 0x6F000000 Application's heap -- 0x70000000 to 0x80000000 Free space, can be used for mapping device memory -- 0x80000000 to 0xD0000000 Space for mapping shared memory segments -- 0xD0000000 to 0xDF000000 Stacks (automatically allocated by kernel, size 0x8000 each) -- 0xE0000000 to 0xFFFFFFFF Kernel code and heap +- 0x20000000 to 0xB0000000 Application's heap +- 0xB0000000 to 0xBF000000 Stacks (automatically allocated by kernel, size 0x8000=32k each) +This is necessary : +- 0xC0000000 to 0xFFFFFFFF Kernel code and heap + +The beginning of the kernel code at 0xC0000000 corresponds to the linker-defined +symbol k_highhalf_addr, that is used at as many places as possible. +If this address was to be changed, it would have to be changed in two places : +- link.ld, change address of k_highhalf_addr; +- loader_.asm, update the temporary GDT structure data. |