Imbus/xv6-riscv-kernel
1
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Map kernel high

Browse source 
Very important to give qemu memory through PHYSTOP :(
This commit is contained in:
Frans Kaashoek 2011-07-29 07:31:27 -04:00
parent dccb915282
commit 9aa0337dc1
20 changed files with 208 additions and 71 deletions
Download patch file Download diff file Expand all files Collapse all files

8
mmu.h
View file

@ -106,18 +106,10 @@ struct segdesc {
// construct linear address from indexes and offset
#define PGADDR(d, t, o) ((uint)((d) << PDXSHIFT | (t) << PTXSHIFT | (o)))
// turn a kernel linear address into a physical address.
// all of the kernel data structures have linear and
// physical addresses that are equal.
#define PADDR(a) ((uint)(a))
// Page directory and page table constants.
#define NPDENTRIES 1024 // page directory entries per page directory
#define NPTENTRIES 1024 // page table entries per page table
#define PGSIZE 4096 // bytes mapped by a page
#define PGSHIFT 12 // log2(PGSIZE)
#define PTXSHIFT 12 // offset of PTX in a linear address
#define PDXSHIFT 22 // offset of PDX in a linear address