diff options
| -rw-r--r-- | vm.c | 8 |
1 files changed, 4 insertions, 4 deletions
@@ -100,8 +100,8 @@ mappages(pde_t *pgdir, void *la, uint size, uint pa, int perm, char* (*alloc)(vo // // // setupkvm() and exec() set up every page table like this: -// 0..USERTOP : user memory (text, data, stack, heap), mapped to some phys mem -// KERNBASE+640K..KERNBASE+1M: mapped to 640K..1M +// 0..USERTOP : user memory (text, data, stack, heap), mapped to some unused phys mem +// KERNBASE..KERNBASE+1M: mapped to 0..1M // KERNBASE+1M..KERNBASE+end : mapped to 1M..end // KERNBASE+end..KERBASE+PHYSTOP : mapped to end..PHYSTOP (free memory) // 0xfe000000..0 : mapped direct (devices such as ioapic) @@ -117,10 +117,10 @@ static struct kmap { uint e; int perm; } kmap[] = { - { P2V(0), 0, 1024*1024, PTE_W}, // First 1Mbyte contains BIOS and IO section + { P2V(0), 0, 1024*1024, PTE_W}, // First 1Mbyte contains BIOS and some IO devices { (void *)KERNLINK, V2P(KERNLINK), V2P(data), 0}, // kernel text, rodata { data, V2P(data), PHYSTOP, PTE_W}, // kernel data, memory - { (void*)DEVSPACE, DEVSPACE, 0, PTE_W}, // device mappings + { (void*)DEVSPACE, DEVSPACE, 0, PTE_W}, // more devices }; // Set up kernel part of a page table. |